{"type": "FeatureCollection", "features": [{"id": "10.1007/s10021-002-0201-x", "type": "Feature", "geometry": null, "properties": {"license": "Restricted", "updated": "2026-09-20T16:14:27Z", "type": "Journal Article", "created": "2003-11-26", "title": "Effects Of Increased Nitrogen Deposition On The Distribution Of N-15-Labeled Nitrogen Between Sphagnum And Vascular Plants", "description": "To elucidate the sensitivity of bog ecosystems to high levels of nitrogen (N) deposition, we investigated the fate of 15N-labeled N deposition in bog vegetation in the Netherlands, both at ambient and increased N deposition. We doubled N deposition by adding 5 g N m\u22122 y\u22121 as dissolved NH4NO3 during three growing seasons to large peat monoliths (1.1 m diameter) with intact bog vegetation kept in large outdoor containers. A small amount of 15N tracer was applied at the start of the second growing season, and its distribution among Sphagnum, vascular plant species, and peat was determined at the end of the third growing season. The 15N tracer was also applied to additional plots at the untreated field site to check for initial distribution. One week after addition, 79% of the total amount of 15N retrieved was found in the living Sphagnum layer and less than 10% had been captured by vascular plants. Fifteen months later, 63% of the total amount of 15N retrieved was still present in the living Sphagnum layer at ambient N deposition. Increased N deposition significantly reduced the proportion of 15N in Sphagnum and increased the amount of 15N in vascular plants. Deep-rooting vascular plant species were significantly more 15N enriched, suggesting that at higher atmospheric inputs N penetrates deeper into the peat. Our results provide the first direct experimental evidence for that which has often been suggested: Increased atmospheric N deposition will lead to increased N availability for vascular plants in ombrotrophic mires.", "keywords": ["0106 biological sciences", "Peat monoliths", "15N tracer", "Bog ecosystem", "Ombrotrophic mire", "Competition", "Nitrogen", "15. Life on land", "01 natural sciences", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1007/s10021-002-0201-x"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Ecosystems", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s10021-002-0201-x", "name": "item", "description": "10.1007/s10021-002-0201-x", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s10021-002-0201-x"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2002-08-01T00:00:00Z"}}, {"id": "10.1111/j.1438-8677.2012.00686.x", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-20T16:17:39Z", "type": "Journal Article", "created": "2012-12-22", "title": "Nitrogen Dynamics In Oak Model Ecosystems Subjected To Air Warming And Drought On Two Different Soils", "description": "Abstract<p>Being tolerant to heat and drought, oaks are promising candidates for future forestry in view of climate change inCentralEurope. Air warming is expected to increase, and drought decrease soilNavailability and thusNsupply to trees. Here, we conducted a model ecosystem experiment, in which mixed stands of young oaks (Quercus robur,Q.\uffc2\uffa0petraeaandQ.\uffc2\uffa0pubescens) were grown on two different soils and subjected to four climate treatments during three growing seasons: air warming by 1\uffe2\uff80\uff932\uffc2\uffa0\uffc2\uffb0C, drought periods (average precipitation reduction of 43\uffe2\uff80\uff9360%), a combination of these two treatments, and a control. In contrast to our hypotheses, neither air warming nor drought significantly affectedNavailability, whereas total amounts, vertical distribution and availability of soilNshowed substantial differences between the two soils. While air warming had no effect on tree growth andNaccumulation, the drought treatment reduced tree growth and increased, or tended to increase,Naccumulation in the reduced biomass, indicating that growth was not limited byN. Furthermore,15N\uffe2\uff80\uff90labelling revealed that this accumulation was associated with an increased uptake of nitrate. On the basis of our results, climate change effects onNdynamics are expected to be less important in oak stands than reduced soil water availability.</p>", "keywords": ["0106 biological sciences", "Hot Temperature", "Nitrogen", "Climate", "Rain", "Quercus petraea", "Nitrate", "Global Warming", "Models", " Biological", "01 natural sciences", "Quercus", "Soil", "Species Specificity", "Stress", " Physiological", "Climate change", "Biomass", "Ecosystem", "Nitrates", "Air", "Water", "04 agricultural and veterinary sciences", "15. Life on land", "Adaptation", " Physiological", "6. Clean water", "Droughts", "15N tracer", "Recovery rate", "Quercus pubescens", "13. Climate action", "0401 agriculture", " forestry", " and fisheries", "Quercus robur", "Ammonium"]}, "links": [{"href": "https://doi.org/10.1111/j.1438-8677.2012.00686.x"}, {"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": "10.1111/j.1438-8677.2012.00686.x", "name": "item", "description": "10.1111/j.1438-8677.2012.00686.x", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/j.1438-8677.2012.00686.x"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2012-12-21T00:00:00Z"}}, {"id": "10.5061/dryad.7wm37pw23", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-20T16:19:27Z", "type": "Dataset", "created": "2024-06-13", "title": "Data from: Patterns and drivers of atmospheric nitrogen deposition retention in global forests", "description": "unspecified# Patterns and drivers of atmospheric nitrogen deposition retention in  global forests We searched the Web of Science Database for peer-reviewed  papers prior to February 22, 2023, using \u201cretention\u201d and \u201cN-15\u201d as the  keywords. The following criteria were applied to filter the peer-reviewed  papers: (1) Selection of 15N tracer experiments in forest ecosystems  conducted in the field, excluding laboratory incubation or greenhouse  experiments; (2) Selection of the absolute value of 15N retention obtained  from the 15N tracer experiment, excluding the relative value; (3)  Selection of 15N tracer experiments including N addition treatments,  excluding other treatments such as fire, phosphorus (P) addition,  potassium addition, etc. Due to limited data on litter layers and  understory vegetation components (i.e., shrubs, herbs, and grasses), the  15N retention of litter layers was combined into organic soil 15N  retention. Within the entire forest ecosystem, the 15N retention of  understory vegetation was not consider, focusing instead on the 15N  allocation among different plant organs (i.e., leaves, branches, stems,  roots). Ultimately, 408 observations were obtained from 56 peer-reviewed  papers, totaling 62 sites and 92 site-years. The study sites were  distributed across North America (25 sites), Europe (14 sites), Asia (14  sites), South America (3 sites), Oceania (4 sites), and Africa (2 sites),  covering tropical forests (5 sites), subtropical forests (10 sites),  temperate forests (42 sites), and boreal forests (5 sites). Raw data for  15N retention of different ecosystem compartments were obtained from  tables, figures, results, or supplementary information in the  peer-reviewed papers. When data were presented in figures, specific values  were extracted using Getdata software 2.22 (GetData, Kogarah, NSW, AUS).  Note: N_retention_data_v2 is based on N_retention_data_v1, with the  addition of raw data. 'XX' in the 'forest_type' and  '15N_tracer_type' sheets represents the 15N retention in  different ecosystem compartments (i.e., plant, leaf, branch, stem, root,  soil, organic soil, mineral soil, and total ecosystem).\u00a0'XX_n'  in the 'forest_type' and '15N_tracer_type' sheets  represents the sample size of 'XX'.\u00a0'XX_mean' in the  'forest_type' and '15N_tracer_type' sheets represents  the mean value of 'XX'.\u00a0'XX_se' in the  'forest_type' and '15N_tracer_type' sheet represents  the standard error of the mean value of 'XX'. 'NA' in  the 'raw_data' sheet represents unavailable observed data.  'MAT_CRU' and 'MAP_CRU' columns of the  'raw_data' sheet indicate that the missing values in the  references are extracted from the CRU.", "keywords": ["ammonium", "nitrogen retention", "15N tracer", "plant organs", "nitrate", "nitrogen allocation", "Forest", "FOS: Natural sciences"], "contacts": [{"organization": "Lin, Quanhong, Zhu, Jianxing, Wang, Qiufeng, Zhang, Qiongyu, Yu, Guirui,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5061/dryad.7wm37pw23"}, {"rel": "self", "type": "application/geo+json", "title": "10.5061/dryad.7wm37pw23", "name": "item", "description": "10.5061/dryad.7wm37pw23", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5061/dryad.7wm37pw23"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2024-06-23T00:00:00Z"}}, {"id": "10.5061/dryad.t3k2t2j", "type": "Feature", "geometry": null, "properties": {"license": "unspecified", "updated": "2026-09-20T16:19:32Z", "type": "Dataset", "created": "2023-08-17", "title": "Data from: Fate of atmospherically deposited NH4+ and NO3- in two temperate forests in China: temporal pattern and redistribution", "description": "The impacts of anthropogenic nitrogen (N) deposition on forest ecosystems  depend in large part on its fate. However, our understanding of the fates  of different forms of deposited N as well as the redistribution over time  within different ecosystems is limited. In this study, we used the  15N-tracer method to investigate both the short-term (1 week to 3 months)  and long-term (1 to 3 years) fates of deposited NH4+ or NO3- by following  the recovery of the 15N in different ecosystem compartments in a larch  plantation forest and a mixed forest located in northeastern China. The  results showed similar total ecosystem retention for deposited NH4+ and  NO3-, but their distribution within the ecosystems (plants vs soil)  differed distinctly particularly in the short-term, with higher 5NO3-  recoveries in plants (while lower recoveries in organic layer) than found  for 15NH4+. The different short-term fate was likely related to the higher  mobility of 15NO3- than 15NH4+ in soils instead of plant uptake  preferences for NO3- over NH4+. In the long-term, differences between N  forms became less prevalent but higher recoveries in trees (particularly  in the larch forest) of\u00a015NO3- than 15NH4+ tracer persisted,  suggesting that incoming NO3- may contribute more to plant biomass  increment and forest carbon sequestration than incoming NH4+. Differences  between the two forests in recoveries were largely driven by a higher 15N  recovery in the organic layer (both N forms) and in trees (for 5NO3-) in  the larch forest compared to the mixed forest. This was due to a more  abundant organic layer and possibly higher tree N demand in the larch  forest than in the mixed forest. Leachate 15N loss was minor (&lt;1%  of the added 15N) for both N forms and in both forests. Total 15N recovery  averaged 78% in the short-term and decreased to 55% in the long-term but  with increasing amount of 15N label (re)-redistributed into slow turn-over  pools (e.g., trees and mineral soil). The different retention dynamics of  deposited NH4+ and NO3- may have implications in environmental policy  related to the anthropogenic emissions of the two N forms.", "keywords": ["15N tracer", "N retention and redistribution", "FOS: Earth and related environmental sciences", "15. Life on land"]}, "links": [{"href": "https://doi.org/10.5061/dryad.t3k2t2j"}, {"rel": "self", "type": "application/geo+json", "title": "10.5061/dryad.t3k2t2j", "name": "item", "description": "10.5061/dryad.t3k2t2j", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5061/dryad.t3k2t2j"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-04-26T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=15N+tracer&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=15N+tracer&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=15N+tracer&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=15N+tracer&offset=4", "hreflang": "en-US"}], "numberMatched": 4, "numberReturned": 4, "distributedFeatures": [], "timeStamp": "2026-09-20T16:56:26.138376Z"}