Insect herbivores play important roles in shaping many ecosystem processes, but how climate change will alter the effects of insect herbivory are poorly understood. To address this knowledge gap, we quantified for the first time how insect frass and cadavers affected leaf litter decomposition rates and nutrient release along a highly constrained 4.3\uffc2\uffb0C mean annual temperature (MAT) gradient in a Hawaiian montane tropical wet forest. We constructed litterbags of standardized locally sourced leaf litter, with some amended with insect frass + cadavers to produce treatments designed to simulate ambient (Control\uffc2\uffa0=\uffc2\uffa0no amendment), moderate (Amended\uffe2\uff80\uff90Low\uffc2\uffa0=\uffc2\uffa02\uffe2\uff80\uff89\uffc3\uff97\uffe2\uff80\uff89Control level), or severe (Amended\uffe2\uff80\uff90High\uffc2\uffa0=\uffc2\uffa011\uffe2\uff80\uff89\uffc3\uff97\uffe2\uff80\uff89Control level) insect outbreak events. Multiple sets of these litterbags were deployed across the MAT gradient, with individual litterbags collected periodically over one\uffe2\uff80\uff89year to assess how rising MAT altered the effects of insect deposits on litter decomposition rates and nitrogen (N) release. Increased MAT and insect inputs additively increased litter decomposition rates and N immobilization rates, with effects being stronger for Amended\uffe2\uff80\uff90High litterbags. However, the apparent temperature sensitivity (Q10) of litter decomposition was not clearly affected by amendments. The effects of adding insect deposits in this study operated differently than the slower litter decomposition and greater N mobilization rates often observed in experiments which use chemical fertilizers (e.g., urea, ammonium nitrate). Further research is required to understand mechanistic differences between amendment types. Potential increases in outbreak\uffe2\uff80\uff90related herbivore deposits coupled with climate warming will accelerate litter decomposition and nutrient cycling rates with short\uffe2\uff80\uff90term consequences for nutrient cycling and carbon storage in tropical montane wet forests.Salt marshes provide an important and unique habitat for plants and animals. To restore salt marshes, numerous coastal realignment projects have been carried out, but restored marshes often show persistent ecological differences from natural marshes. We evaluate the effects of elevation and marsh topography, which are in turn affected by drainage and livestock grazing, on soil salinity after de-embankment. Salinity in the topsoil was monitored during the first 10 years after de-embankment and compared with salinity in an adjacent reference marsh. Additionally, salinity at greater depths (down to 1.2 m below the marsh surface) was monitored during the first 4 years by measuring the electrical conductivity of the groundwater. Chloride concentration in the top soil strongly decreased with increasing elevation; however, it was not affected by marsh topography, i.e. distance to creek or breach. Chloride concentrations higher than 2 g Cl-/litre were found at elevations below 0.6 m + MHT. Salinization of the groundwater, however, took several years. At low marsh elevations, the salinity of the deep groundwater (at 1.2 m depth) increased slowly throughout the full 4-year period of monitoring but did not reach the level of seawater. Compared to the ungrazed treatment, the grazed treatment led to lower accretion rates, lower soil-moisture content and higher chloride content of soil moisture. The de-embankment of the agricultural grasslands resulted in a rapid increase of soil salinity, although deeper ground-water levels showed a much slower response. Elevation accounted for most of the variation in the salinization of the soil. Grazing may enhance salinity of the top soil.
", "keywords": ["0106 biological sciences", "2. Zero hunger", "Salinity", "ARGENTINA", "Ecology", "IMPACT", "WADDEN SEA", "HALOPHYTES", "15. Life on land", "Oceanography", "01 natural sciences", "6. Clean water", "DISPERSAL", "Elevation", "SOIL-SALINITY", "Drainage", "VEGETATION", "Grazing management", "INUNDATION FREQUENCY", "ELEVATION", "NITROGEN MINERALIZATION", "Nature and Landscape Conservation"], "contacts": [{"organization": "Roos M. Veenklaas, Peter Esselink, Jan P. Bakker, E.C. Koppenaal,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1007/s11852-015-0390-z"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Journal%20of%20Coastal%20Conservation", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s11852-015-0390-z", "name": "item", "description": "10.1007/s11852-015-0390-z", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s11852-015-0390-z"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2015-07-03T00:00:00Z"}}, {"id": "10.1007/s12571-009-0030-2", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-29T16:15:18Z", "type": "Journal Article", "created": "2009-07-24", "title": "Assessing The Effect Of Faidherbia Albida Based Land Use Systems On Barley Yield At Field And Regional Scale In The Highlands Of Tigray, Northern Ethiopia", "description": "Implications of changes in traditional Faidherbia albida based land use systems on productivity were investigated in Tigray, northern Ethiopia. The relation between F. albida based-land use systems and crop productivity was explored in 77 fields and 81 farms at field and regional scales, respectively. Barley yield and soil fertility increased when field locations were closer to a F. albida trunk in the F. albida alone (AA) and F. albida + livestock (AL) land use systems. However, the F. albida + Eucalyptus camaldulensis (AE) land use system showed a decreasing trend in barley yield and soil fertility as distance from a F. albida trunk decreased. At regional scales, higher F. albida tree density per farm and sparsely cultivated land use types were associated with increased potential ecosystem services (barley yield). This study suggests that local biodiversity components (e.g. F. albida trees) can increase crop yield and soil fertility significantly when grown within and around farm lands. This study contributes to the knowledge on agricultural productivity enhancement by developing an approach to scaling up from farm to regional level.", "keywords": ["0106 biological sciences", "2. Zero hunger", "growth", "conservation", "tree-crop interactions", "04 agricultural and veterinary sciences", "15. Life on land", "agroforestry practices", "maize", "01 natural sciences", "acacia-albida", "eucalyptus-tereticornis", "opportunities", "0401 agriculture", " forestry", " and fisheries", "nitrogen mineralization", "biodiversity"], "contacts": [{"organization": "Hadgu, K.M., Kooistra, L., Rossing, W.A.H., van Bruggen, A.H.C.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1007/s12571-009-0030-2"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Food%20Security", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s12571-009-0030-2", "name": "item", "description": "10.1007/s12571-009-0030-2", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s12571-009-0030-2"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2009-07-25T00:00:00Z"}}, {"id": "10.1016/j.ecss.2013.10.026", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-29T16:16:01Z", "type": "Journal Article", "created": "2013-11-01", "title": "Does Livestock Grazing Affect Sediment Deposition And Accretion Rates In Salt Marshes?", "description": "Accretion rates, defined as the vertical growth of salt marshes measured in mm per year, may be influenced by grazing livestock in two ways: directly, by increasing soil compaction through trampling, and indirectly, by reducing aboveground biomass and thus decreasing sediment deposition rates measured in g/m(2) per year. Although accretion rates and the resulting surface elevation change largely determine the resilience of salt marshes to sea-level rise (SLR), the effect of livestock grazing on accretion rates has been little studied. Therefore, this study aimed to investigate the effect of livestock grazing on salt-marsh accretion rates. We hypothesise that accretion will be lower in grazed compared to ungrazed salt marshes. In four study sites along the mainland coast of the Wadden Sea (in the south-eastern North Sea), accretion rates, sediment deposition rates, and soil compaction of grazed and ungrazed marshes were analysed using the Cs-137 radionuclide dating method. Accretion rates were on average 11.6 mm yr(-1) during recent decades and thus higher than current and projected rates of SLR. Neither accretion nor sediment deposition rates were significantly different between grazing treatments. Meanwhile, soil compaction was clearly affected by grazing with significantly higher dry bulk density on grazed compared to ungrazed parts. Based on these results, we conclude that other factors influence whether grazing has an effect on accretion and sediment deposition rates and that the effect of grazing on marsh growth does not follow a direct causal chain. It may have a great importance when interacting with other biotic and abiotic processes on the marsh. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.
", "keywords": ["0106 biological sciences", "F800 - Physical geographical sciences", "550", "137Cs", "geochronology", "SEA-LEVEL RISE", "SURFACE ELEVATION", "01 natural sciences", "630", "Wadden Sea", "inundation", "CS-137", "F820 Geomorphology", "(CS)-C-137", "compaction", "NITROGEN MINERALIZATION", "COASTAL WETLANDS", "0105 earth and related environmental sciences", "land use management", "WADDEN SEA", "15. Life on land", "NORTH-SEA", "13. Climate action", "C180 - Ecology", "TIDAL MARSH", "VEGETATION", "C180 Ecology", "dating", "SW NETHERLANDS"]}, "links": [{"href": "https://doi.org/10.1016/j.ecss.2013.10.026"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Estuarine%2C%20Coastal%20and%20Shelf%20Science", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.ecss.2013.10.026", "name": "item", "description": "10.1016/j.ecss.2013.10.026", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.ecss.2013.10.026"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2013-12-01T00:00:00Z"}}, {"id": "10.1016/j.soilbio.2013.07.001", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-29T16:17:04Z", "type": "Journal Article", "created": "2013-07-14", "title": "Agricultural Management Affects The Response Of Soil Bacterial Community Structure And Respiration To Water-Stress", "description": "Soil microorganisms are responsible for organic matter decomposition processes that regulate soil carbon storage and mineralisation to CO2. Climate change is predicted to increase the frequency of drought events, with uncertain consequences for soil microbial communities. In this study we tested the hypothesis that agricultural management used to enhance soil carbon stocks would increase the stability of microbial community structure and activity in response to water-stress. Soil was sampled from a long-term field trial with three soil carbon management systems and was used in a laboratory study of the effect of a dry\u2013wet cycle on organic C mineralisation and microbial community structure. After a drying\u2013rewetting event, soil microcosms were maintained wet and microbial community structure and abundance as well as microbial respiration were measured for four weeks. The results showed that the NO-TILL management system, with the highest soil organic matter content and respiration rate, had a distinct bacterial community structure relative to the conventional and the TILL without fertiliser systems. In all management systems, the rewetting event clearly modified microbial community structure and activity. Both returned to their pre-drought state after 28 days. However, the magnitude of variation of C mineralisation was lower (i.e. the resistance to stress was higher) in the NO-TILL system. The genetic structure of the NO-TILL bacterial communities was most modified by water-stress and exhibited a slower recovery rate. This suggests that land use management can increase microbial functional resistance to drought stress via the establishment of bacterial communities with particular metabolic capacities. Nevertheless, the resilience rates of C mineralisation were similar among management regimes, suggesting that similar mechanisms occur, maybe due to a common soil microbial community legacy.", "keywords": ["[SDE] Environmental Sciences", "570", "Agricultural land use", "[SDV]Life Sciences [q-bio]", "630", "Drying-rewetting", "FUNCTIONAL STABILITY", "[SDV.BV]Life Sciences [q-bio]/Vegetal Biology", "[SDV.BV] Life Sciences [q-bio]/Vegetal Biology", "Drying\u2013rewetting", "NITROGEN MINERALIZATION", "Global change", "2. Zero hunger", "C mineralisation", "CLIMATE-CHANGE", "MICROBIAL COMMUNITY", "LAND-USE CHANGE", "04 agricultural and veterinary sciences", "RESILIENCE", "15. Life on land", "DRYING-REWETTING FREQUENCY", "6. Clean water", "[SDV] Life Sciences [q-bio]", "ORGANIC-MATTER", "13. Climate action", "[SDE]Environmental Sciences", "Bacterial community structure", "0401 agriculture", " forestry", " and fisheries", "CATABOLIC DIVERSITY", "CARBON STOCKS", "Stability"]}, "links": [{"href": "https://doi.org/10.1016/j.soilbio.2013.07.001"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Biology%20and%20Biochemistry", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.soilbio.2013.07.001", "name": "item", "description": "10.1016/j.soilbio.2013.07.001", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.soilbio.2013.07.001"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2013-11-01T00:00:00Z"}}, {"id": "10.1016/j.soilbio.2014.07.027", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-29T16:17:04Z", "type": "Journal Article", "created": "2014-08-24", "title": "Crop Rotation Complexity Regulates The Decomposition Of High And Low Quality Residues", "description": "While many ecosystem processes depend on biodiversity, the relationships between agricultural plant diversity and soil carbon (C) and nitrogen (N) dynamics remains controversial. Our objective was to examine how temporal plant diversity (i.e. crop rotation) influences residue decomposition, a key ecosystem function that regulates nutrient cycling, greenhouse gas emissions, and soil organic matter formation. We incubated soils from five long-term crop rotations, located at W.K. Kellogg Biological Station LTER in southwestern Michigan, USA, with and without four chemically diverse crop residues. Increasing crop biodiversity increased soil potentially mineralizable C by 125%, increased hydrolytic enzyme activity by 46%, but decreased oxidative enzyme activity by 20% in soils before residue was added. After residue additions, soils from more diverse cropping systems decomposed all residues more rapidly (0.2e8.3% greater mass loss) compared to monoculture corn. The fast-cycling, \u2018Active C\u2019 pool and microbial biomass N increased with higher cropping diversity, but the differences among rotations in Active C pools was higher for the most recalcitrant residues. Further, the ratio of the cellulose degrading enzyme ( b-glucosidase) to the lignin degrading enzyme (phenol oxidase) was highest in the two most diverse crop rotations regardless of residue additions, providing additional evidence of enhanced microbial activity and substrate acquisition in more diverse rotations. Our study shows that crop diversity over time influences the processing of newly-added residues, microbial dynamics, and nutrient cycling. Diversifying crop rotations has the potential to enhance soil ecosystem functions and is critical to maintaining soil services in agricultural systems.", "keywords": ["2. Zero hunger", "Nitrogen mineralization", "Litter quality", "Carbon mineralization", "Microbial biomass", "04 agricultural and veterinary sciences", "Extracellular enzymes", "Biogeochemistry", "15. Life on land", "01 natural sciences", "13. Climate action", "Plant biodiversity", "0401 agriculture", " forestry", " and fisheries", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.soilbio.2014.07.027"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Biology%20and%20Biochemistry", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.soilbio.2014.07.027", "name": "item", "description": "10.1016/j.soilbio.2014.07.027", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.soilbio.2014.07.027"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2014-11-01T00:00:00Z"}}, {"id": "10.1016/j.soilbio.2018.03.008", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-29T16:17:07Z", "type": "Journal Article", "created": "2018-03-12", "title": "Forbs Differentially Affect Soil Microbial Community Composition And Functions In Unfertilized Ryegrass-Red Clover Leys", "description": "Increasing plant diversity in agroecosystems is proposed to enhance multiple ecosystem services. Adding selected forbs such as caraway (Carum carvi L.) and plantain (Plantago lanceolata L.) to productive grass-clover mixtures can further enhance forage yields, root biomass, uptake of mineral nutrients and improve animal performance. Yet, it remains unclear whether and how adding these forbs to grass-clover mixtures can influence soil microbial communities and associated soil carbon (C) and nitrogen (N) cycling. Based on a three-year grassland experiment varying in species diversity and composition with and without fertilizer application, we determined soil microbial community composition and functions related to C and N cycling under laboratory incubations. Results showed that inclusion of caraway modified soil microbial community composition by enhancing fungal-to-bacterial phospholipid fatty acids of the ryegrass-red clover mixture. Adding plantain to the ryegrass-red clover mixture increased the relative decomposition rate of the labile C pool, but not of the recalcitrant C pool. Yet, \u03b2-glucosidase activity and net N mineralization were unchanged due to inclusion of either forb. Moreover, fertilization with cattle slurry generally weakened these forb-induced changes in soil microbial properties. These findings demonstrate that adding selected forbs to unfertilized grass-clover leys can modify soil microbial community composition and associated C and N cycling, implying a potential for promoting long-term soil C sequestration through enhanced fungi-to-bacteria ratio, but a limited role in improving soil N fertility.", "keywords": ["2. Zero hunger", "Nitrogen mineralization", "Crop combinations and interactions", "Nutrient turnover", "Fertilization", "Soil carbon dynamics", "Caraway", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "15. Life on land", "Plantain", "Forage mixtures"]}, "links": [{"href": "https://doi.org/10.1016/j.soilbio.2018.03.008"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Biology%20and%20Biochemistry", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.soilbio.2018.03.008", "name": "item", "description": "10.1016/j.soilbio.2018.03.008", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.soilbio.2018.03.008"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2018-06-01T00:00:00Z"}}, {"id": "10.1023/a:1004868502539", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-29T16:17:33Z", "type": "Journal Article", "title": "Leaf Litter Decomposition Of Piper Aduncum, Gliricidia Sepium And Imperata Cylindrica In The Humid Lowlands Of Papua New Guinea", "description": "No information is available on the decomposition and nutrient release pattern of Piper aduncum and Imperata cylindrica despite their importance in shifting cultivation systems of Papua New Guinea and other tropical regions. We conducted a litter bag study (24 weeks) on a Typic Eutropepts in the humid lowlands to assess the rate of decomposition of Piper aduncum, Imperata cylindrica and Gliricidia sepium leaves under sweet potato (Ipomoea batatas). Decomposition rates of piper leaf litter were fastest followed closely by gliricidia, and both lost 50% of the leaf biomass within 10 weeks. Imperata leaf litter decomposed much slower and half-life values exceeded the period of observation. The decomposition patterns were best explained by the lignin plus polyphenol over N ratio which was lowest for piper (4.3) and highest for imperata (24.7). Gliricidia leaf litter released 79 kg N ha(-1), whereas 18 kg N ha(-1) was immobilised in the imperata litter. The mineralization of P was similar for the three species, but piper litter released large amounts of K. The decomposition and nutrient release patterns had significant effects on the soil. The soil contained significantly more water in the previous imperata plots at 13 weeks due to the relative slow decomposition of the leaves. Soil N levels were significantly reduced in the previous imperata plots due to immobilisation of N. Levels of exchangeable K were significantly increased in the previous piper plots due to the large addition of K. It can be concluded that piper leaf litter is a significant and easily decomposable source of K which is an important nutrient for sweet potato. Gliricidia leaf litter contained much N, whereas imperata leaf litter releases relatively little nutrients and keeps the soil more moist. Gliricidia fallow is more attractive than an imperata fallow for it improves the soil fertility and produces fuelwood as additional saleable products.", "keywords": ["Polyphenol", "Tropical Legumes", "Leaves", "tropical legumes", "Soil Science", "Nitrogen Mineralization", "Lignin", "n-release", "soil", "Soil", "residues", "C1", "Soil Changes", "nitrogen mineralization", "Chemical-composition", "580", "nutrient release", "Plant Sciences", "Sweet-potato", "Agriculture", "Residues", "Quality", "Agronomy", "Improved Fallow", "quality", "Natural Fallow", "sweet-potato", "Nutrient Release", "300104 Land Capability and Soil Degradation", "chemical-composition", "leaves", "N-release", "770800 Farmland (incl. Arable Land and Permanent Crop Land)"]}, "links": [{"href": "https://doi.org/10.1023/a:1004868502539"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Plant%20and%20Soil", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1023/a:1004868502539", "name": "item", "description": "10.1023/a:1004868502539", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1023/a:1004868502539"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2001-01-01T00:00:00Z"}}, {"id": "10.1055/s-2001-17730", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-29T16:18:04Z", "type": "Journal Article", "created": "2002-07-26", "title": "The Impact Of Sheep Grazing On Net Nitrogen Mineralization Rate In Two Temperate Salt Marshes", "description": "Abstract: Nitrogen mineralization rate was studied in grazing trials with three different stocking rates (0, 3, 10 sheep ha\uffe2\uff80\uff901) in two man\uffe2\uff80\uff90made salt marshes, viz. a Puccinellia maritima\uffe2\uff80\uff90dominated low salt marsh and a high salt marsh dominated by Festuca rubra. Mineralization rates were derived from the amounts of mineral N which accumulated in situ during six\uffe2\uff80\uff90week incubation periods in tubes containing undisturbed soil cores from the upper 10 cm soil layer. The annual rates of net N mineralization were significantly higher in the better drained, high salt marsh (71 \uffe2\uff80\uff90 81 kg ha\uffe2\uff80\uff901 yr\uffe2\uff80\uff901) than in the low salt marsh (39 \uffe2\uff80\uff90 49 kg ha\uffe2\uff80\uff901 yr\uffe2\uff80\uff901). High amounts of belowground litter accumulated in the low salt marsh due to frequent water logging. Both N mineralization and nitrification rate were negatively correlated with soil water content. In the Puccinellia maritima salt marsh, grazing had neither an effect on N mineralization rates during any of the incubation periods nor on annual mineralization rates. In the Festuca rubra salt marsh, N mineralization rates increased earlier during spring at the intensively grazed site than at the moderately grazed and the ungrazed site. N mineralization and nitrification rates were significantly higher at the ungrazed site than at the intensively grazed site during the period of peak net N mineralization from the end of April until mid\uffe2\uff80\uff90June. Although sheep grazing affected the seasonal pattern of N mineralization in the high marsh, grazing did not affect the annual rate of net N mineralization.
", "keywords": ["2. Zero hunger", "0106 biological sciences", "LIMITATION", "seasonality", "SUCCESSION", "MICROBIAL BIOMASS", "15. Life on land", "grazing experiment", "01 natural sciences", "nitrification", "salt marsh", "zonation", "PSEUDOREPLICATION", "vegetation", "PLANT-GROWTH", "HERBIVORES", "ECOSYSTEM", "VEGETATION", "nitrogen mineralization"]}, "links": [{"href": "https://doi.org/10.1055/s-2001-17730"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Plant%20Biology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1055/s-2001-17730", "name": "item", "description": "10.1055/s-2001-17730", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1055/s-2001-17730"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2001-09-01T00:00:00Z"}}, {"id": "10.1111/1365-2435.12475", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-29T16:18:41Z", "type": "Journal Article", "created": "2015-05-12", "title": "Nitrogen Saturation In Humid Tropical Forests After 6years Of Nitrogen And Phosphorus Addition: Hypothesis Testing", "description": "Summary
Nitrogen (N) saturation hypothesis suggests that when an ecosystem reaches N\uffe2\uff80\uff90saturation, continued N input will cause increased N leaching, nitrous oxide (N2O) emission, and N mineralization and nitrification rates. It also suggests that a different element will become the main limiting factor when N saturation has been reached. Although this hypothesis has been tested in temperate forests, whether they can be directly applied to N\uffe2\uff80\uff90saturated tropical forests remain poorly addressed.
To test this hypothesis, soil inorganic N, soil N mineralization and nitrification rate, soil N2O emission rate and nitrate () leaching rate were measured in an N\uffe2\uff80\uff90saturated old\uffe2\uff80\uff90growth tropical forest in southern China, after 6\uffc2\uffa0years of N and P addition. We hypothesized that N addition would stimulate further N saturation, but P addition might alleviate N saturation.
As expected, our results showed that six continuous years of experimental N addition did cause further N saturation, which was indicated by significant increases in soil inorganic N concentration, N2O emission and nitrate () leaching. However, in contrast to our expectations, N addition significantly decreased in\uffc2\uffa0situ rates of net N mineralization and nitrification, which could be related to associated changes in enzyme activity and microbial community composition. On the other hand, P addition mitigated N saturation, as expected. Soil inorganic N concentration, N2O emission and leaching decreased significantly after P addition, but the net rates of N mineralization and nitrification were significantly increased.
Our results provide a new understanding of the N saturation hypothesis, suggesting that the effects of long\uffe2\uff80\uff90term N deposition on net N mineralization and nitrification rates in N\uffe2\uff80\uff90saturated tropical forests can be negative and that P addition can alleviate N saturation in such tropical systems.
", "keywords": ["China", "Nitrogen mineralization and nitrification", "Tropical forest", "Nitrogen saturation", "13. Climate action", "Phosphorus addition", "0401 agriculture", " forestry", " and fisheries", "N 2 O emission", "04 agricultural and veterinary sciences", "15. Life on land", "Nitrogen deposition"]}, "links": [{"href": "https://doi.org/10.1111/1365-2435.12475"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Functional%20Ecology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1111/1365-2435.12475", "name": "item", "description": "10.1111/1365-2435.12475", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/1365-2435.12475"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2015-06-06T00:00:00Z"}}, {"id": "10.1590/1809-43921999291056", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-29T16:19:52Z", "type": "Journal Article", "created": "2015-06-27", "title": "Mudan\u00e7as Na Biomassa Microbiana E Nas Tansforma\u00e7\u00f5es De Nitrog\u00eanio Do Solo Em Uma Sequ\u00eancia De Idades De Pastagens Ap\u00f3s Derruba E Queima Da Floresta Na Amaz\u00f4nia Central", "description": "Foram estudadas mudan\uffc3\uffa7as nos par\uffc3\uffa2metros bioqu\uffc3\uffadmicos do solo em resultado da derruba e queima da floresta tropical na Amaz\uffc3\uffb4nia brasileira para o estabelecimento de pastagens atrav\uffc3\uffa9s da biomassa microbiana, um sens\uffc3\uffadvel indicador de modifica\uffc3\uffa7\uffc3\uffb5es na fertilidade do solo. Na sequ\uffc3\uffaancia de idades das pastagens estudadas (de 2 a 13 anos), a biomassa microbiana e a respira\uffc3\uffa7\uffc3\uffa3o na camada superficial de 0-5 cm do solo aumentaram at\uffc3\uffa9 os cinco anos ap\uffc3\uffb3s o estabelecimento da pastagem, seguindo-se um decl\uffc3\uffadnio progressivo, que se acentua ap\uffc3\uffb3s o oitavo ano da pastagem. As baixas taxas de mineraliza\uffc3\uffa7\uffc3\uffa3o do nitrog\uffc3\uffaanio no solo sugerem que o estoque de N org\uffc3\uffa2nico est\uffc3\uffa1 diminuindo, o que pode levar a defici\uffc3\uffaancias de nitrog\uffc3\uffaanio nos solos das pastagens mais velhas. A massa total de ra\uffc3\uffadzes nos primeiros 20 cm do solo diminuiu drasticamente com a idade da pastagem. A rela\uffc3\uffa7\uffc3\uffa3o C/N das ra\uffc3\uffadzes finas na pastagem foi mais elevada do que na floresta madura. Isto pode indicar a forma\uffc3\uffa7\uffc3\uffa3o, pela gram\uffc3\uffadnea da pastagem, de uma mat\uffc3\uffa9ria org\uffc3\uffa2nica com potencial mais baixo de libera\uffc3\uffa7\uffc3\uffa3o de nutrientes minerais do que a originalmente produzida pela floresta, o que pode estar contribuindo para a baixa produtividade das pastagens a m\uffc3\uffa9dio prazo e para sua posterior degrada\uffc3\uffa7\uffc3\uffa3o. O per\uffc3\uffadodo de 5 anos de pousio ap\uffc3\uffb3s o abandono ainda foi curto para recuperar um solo de pastagem usada moderadamente para pastejo por cerca de 4 anos.
", "keywords": ["0106 biological sciences", "Science (General)", "04 agricultural and veterinary sciences", "Nitrogen Mineralization", "degrada\u00e7\u00e3o dos solos", "01 natural sciences", "Microbial Biomass", "Old Pastures", "biomassa microbiana", "Q1-390", "pastagens", "0401 agriculture", " forestry", " and fisheries", "mineraliza\u00e7\u00e3o do nitrog\u00eanio org\u00e2nico"], "contacts": [{"organization": "LUIZ\u00c3O, Regina C. C, COSTA, Enir Salazar, LUIZ\u00c3O, Fl\u00e1vio J,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1590/1809-43921999291056"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Acta%20Amazonica", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1590/1809-43921999291056", "name": "item", "description": "10.1590/1809-43921999291056", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1590/1809-43921999291056"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1999-03-01T00:00:00Z"}}, {"id": "10.2307/1941987", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-29T16:20:38Z", "type": "Journal Article", "created": "2006-04-18", "title": "Soil Organic-Matter Recovery In Semiarid Grasslands - Implications For The Conservation Reserve Program", "description": "Although the effects of cultivation on soil organic matter and nutrient supply capacity are well understood, relatively little work has been done on the long\uffe2\uff80\uff90term recovery of soils from cultivation. We sampled soils from 12 locations within the Pawnee National Grasslands of northeastern Colorado, each having native fields and fields that were historically cultivated but abandoned 50 yr ago. We also sampled fields that had been cultivated for at least 50 yr at 5 of these locations. Our results demonstrated that soil organic matter, silt content, microbial biomass, potentially mineralizable N, and potentially respirable C were significantly lower on cultivated fields than on native fields. Both cultivated and abandoned fields also had significantly lower soil organic matter and silt contents than native fields. Abandoned fields, however, were not significantly different from native fields with respect to microbial biomass, potentially mineralizable N, or respirable C. In addition, we found that the characteristic small\uffe2\uff80\uff90scale heterogeneity of the shortgrass steppe associated with individuals of the dominant plant, Bouteloua gracilis, had recovered on abandoned fields. Soil beneath plant canopies had an average of 200 g/m2 more C than between\uffe2\uff80\uff90plant locations. We suggest that 50 yr is an adequate time for recovery of active soil organic matter and nutrient availability, but recovery of total soil organic matter pools is a much slower process. Plant population dynamics may play an important role in the recovery of shortgrass steppe ecosystems from disturbance, such that establishment of perennial grasses determines the rate of organic matter recovery.
", "keywords": ["conservation reserve program (CRP)", "580", "2. Zero hunger", "microbial biomass", "cultivation", "soil organic matter recovery", "agroecosystem", "shortgrass steppe", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "15. Life on land", "nitrogen mineralization"]}, "links": [{"href": "https://doi.org/10.2307/1941987"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Ecological%20Applications", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.2307/1941987", "name": "item", "description": "10.2307/1941987", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.2307/1941987"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1995-08-01T00:00:00Z"}}, {"id": "10.3390/f7020045", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-29T16:21:05Z", "type": "Journal Article", "created": "2016-02-19", "description": "Microbial-mediated decomposition and nutrient mineralization are major drivers of forest productivity. As landscape-scale fuel reduction treatments are being implemented throughout the fire-prone western United States of America, it is important to evaluate operationally how these wildfire mitigation treatments alter belowground processes. We quantified these important belowground components before and after management-applied fuel treatments of thinning alone, thinning combined with prescribed fire, and prescribed fire in ponderosa pine (Pinus ponderosa) stands at the Southwest Plateau, Fire and Fire Surrogate site, Arizona. Fuel treatments did not alter pH, total carbon and nitrogen (N) concentrations, or base cations of the forest floor (O horizon) or mineral soil (0\uffe2\uff80\uff935 cm) during this 2-year study. In situ rates of net N mineralization and nitrification in the surface mineral soil (0\uffe2\uff80\uff9315 cm) increased 6 months after thinning with prescribed fire treatments; thinning only resulted in net N immobilization. The rates returned to pre-treatment levels after one year. Based on phospholipid fatty acid composition, microbial communities in treated areas were similar to untreated areas (control) in the surface organic horizon and mineral soil (0\uffe2\uff80\uff935 cm) after treatments. Soil potential enzyme activities were not significantly altered by any of the three fuel treatments. Our results suggest that a variety of one-time alternative fuel treatments can reduce fire hazard without degrading soil fertility.
", "keywords": ["2. Zero hunger", "Ecology", "Life on Land", "fuel treatments", "13. Climate action", "Forestry Sciences", "fuel treatments; nitrification; nitrogen mineralization; phospholipid fatty acids; soil enzymes", "Plant Biology", "phospholipid fatty acids", "15. Life on land", "soil enzymes", "nitrification", "nitrogen mineralization"], "contacts": [{"organization": "Overby, Steven T, Hart, Stephen C,", "roles": ["creator"]}]}, "links": [{"href": "http://www.mdpi.com/1999-4907/7/2/45/pdf"}, {"href": "https://escholarship.org/content/qt54s4m5pt/qt54s4m5pt.pdf"}, {"href": "https://doi.org/10.3390/f7020045"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Forests", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.3390/f7020045", "name": "item", "description": "10.3390/f7020045", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.3390/f7020045"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2016-02-18T00:00:00Z"}}, {"id": "10.3390/f7110277", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-29T16:21:05Z", "type": "Journal Article", "created": "2016-11-15", "title": "Resource Utilization By Native And Invasive Earthworms And Their Effects On Soil Carbon And Nitrogen Dynamics In Puerto Rican Soils", "description": "Resource utilization by earthworms affects soil C and N dynamics and further colonization of invasive earthworms. By applying 13C-labeled Tabebuia heterophylla leaves and 15N-labeled Andropogon glomeratus grass, we investigated resource utilization by three earthworm species (invasive endogeic Pontoscolex corethrurus, native anecic Estherella sp, and native endogeic Onychochaeta borincana) and their effects on soil C and N dynamics in Puerto Rican soils in a 22-day laboratory experiment. Changes of 13C/C and 15N/N in soils, earthworms, and microbial populations were analyzed to evaluate resource utilization by earthworms and their influences on C and N dynamics. Estherella spp. utilized the 13C-labeled litter; however, its utilization on the 13C-labeled litter reduced when cultivated with P. corethrurus and O. borincana. Both P. corethrurus and O. borincana utilized the 13C-labeled litter and 15C-labeled grass roots and root exudates. Pontoscolex corethrurus facilitated soil respiration by stimulating 13C-labeled microbial activity; however, this effect was suppressed possibly due to the changes in the microbial activities or community when coexisting with O. borincana. Increased soil N mineralization by individual Estherella spp. and O. borincana was reduced in the mixed-species treatments. The rapid population growth of P. corethrurus may increase competition pressure on food resources on the local earthworm community. The relevance of resource availability to the population growth of P. corethrurus and its significance as an invasive species is a topic in need of future research.
", "keywords": ["2. Zero hunger", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "carbon and nitrogen mineralization; invasive earthworms; Luquillo mountains; microbial respiration; Puerto Rico; stable isotope; tropics", "15. Life on land", "6. Clean water"]}, "links": [{"href": "http://www.mdpi.com/1999-4907/7/11/277/pdf"}, {"href": "https://doi.org/10.3390/f7110277"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Forests", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.3390/f7110277", "name": "item", "description": "10.3390/f7110277", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.3390/f7110277"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2016-11-15T00:00:00Z"}}, {"id": "10.5061/dryad.cb7tp6m", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-29T16:21:42Z", "type": "Dataset", "title": "Data from: Effects of aridity on soil microbial communities and functions across soil depths on the Mongolian Plateau", "description": "unspecified1. Arid and semi-arid grassland ecosystems cover about 15% of the global land surface and provide vital soil carbon (C) and nitrogen (N) sequestration. Although half of the soil C and N is stored in deep soils (below 30 cm), no regional-scale study of microbial properties and their functions through the soil profile has been conducted in these drylands. 2. To explore the distribution and determinants of microbial properties and C and N mineralization rates through soil profile along aridity gradient at a regional scale, we investigated these variables for four soil layers (0-20, 20-40, 40-60, and 60-100 cm) in 132 plots on the Mongolia Plateau. 3. Soil microbial properties (biomass and bacteria:fungi ratio) and C and N mineralization rates decreased with increasing soil depth and aridity at the regional scale. Aridity-induced declines in soil microbial properties mainly resulted from the negative effects of aridity on ANPP/root biomass and soil organic C (SOC) in the surface soil layers (0-20 and 20-40 cm) but from the direct and indirect (via SOC and soil C/N) negative effects of aridity in the deep soil layers (40-60 and 60-100 cm). 4. Aridity-induced declines in soil C mineralization rates mainly resulted from the negative indirect effect of aridity on SOC and microbial properties in each soil layer, with weaker effects of SOC and stronger effects of soil microbes in the deep soil layers. Aridity-induced declines in soil N mineralization rates mainly resulted from the negative indirect effect of aridity on SOC in the three soil layers above 60 cm and mainly resulted from the negative direct effect of aridity in the 60-100 cm soil layer. 5. Aridity via direct or indirect effects strongly determined the patterns of soil microbial properties and C and N mineralization throughout soil profiles on the Mongolian Plateau. These findings suggest that the increases in aridity are likely to induce changes in soil microorganisms and their associated functions across soil depths of semi-arid grasslands, and future models should consider the dynamic interactions between substrates and microbial properties across soil depths in global drylands.", "keywords": ["2. Zero hunger", "biogeographical patterns", "soil carbon mineralization", "13. Climate action", "microbial community structure", "semi-arid grasslands", "depth profile", "15. Life on land", "soil nitrogen mineralization"], "contacts": [{"organization": "Chen, Dima, Saleem, Muhammad, Cheng, Junhui, Mi, Jia, Chu, Pengfei, Tuvshintogtokh, Indree, Hu, Shuijin, Bai, Yongfei,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5061/dryad.cb7tp6m"}, {"rel": "self", "type": "application/geo+json", "title": "10.5061/dryad.cb7tp6m", "name": "item", "description": "10.5061/dryad.cb7tp6m", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5061/dryad.cb7tp6m"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2020-05-14T00:00:00Z"}}, {"id": "PMC9493466", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-29T16:28:48Z", "type": "Journal Article", "created": "2022-09-22", "title": "Impacts of insect frass and cadavers on soil surface litter decomposition along a tropical forest temperature gradient", "description": "AbstractInsect herbivores play important roles in shaping many ecosystem processes, but how climate change will alter the effects of insect herbivory are poorly understood. To address this knowledge gap, we quantified for the first time how insect frass and cadavers affected leaf litter decomposition rates and nutrient release along a highly constrained 4.3\uffc2\uffb0C mean annual temperature (MAT) gradient in a Hawaiian montane tropical wet forest. We constructed litterbags of standardized locally sourced leaf litter, with some amended with insect frass + cadavers to produce treatments designed to simulate ambient (Control\uffc2\uffa0=\uffc2\uffa0no amendment), moderate (Amended\uffe2\uff80\uff90Low\uffc2\uffa0=\uffc2\uffa02\uffe2\uff80\uff89\uffc3\uff97\uffe2\uff80\uff89Control level), or severe (Amended\uffe2\uff80\uff90High\uffc2\uffa0=\uffc2\uffa011\uffe2\uff80\uff89\uffc3\uff97\uffe2\uff80\uff89Control level) insect outbreak events. Multiple sets of these litterbags were deployed across the MAT gradient, with individual litterbags collected periodically over one\uffe2\uff80\uff89year to assess how rising MAT altered the effects of insect deposits on litter decomposition rates and nitrogen (N) release. Increased MAT and insect inputs additively increased litter decomposition rates and N immobilization rates, with effects being stronger for Amended\uffe2\uff80\uff90High litterbags. However, the apparent temperature sensitivity (Q10) of litter decomposition was not clearly affected by amendments. The effects of adding insect deposits in this study operated differently than the slower litter decomposition and greater N mobilization rates often observed in experiments which use chemical fertilizers (e.g., urea, ammonium nitrate). Further research is required to understand mechanistic differences between amendment types. Potential increases in outbreak\uffe2\uff80\uff90related herbivore deposits coupled with climate warming will accelerate litter decomposition and nutrient cycling rates with short\uffe2\uff80\uff90term consequences for nutrient cycling and carbon storage in tropical montane wet forests.