{"type": "FeatureCollection", "features": [{"id": "10.1016/j.scitotenv.2015.03.027", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-25T16:16:53Z", "type": "Journal Article", "created": "2015-03-13", "title": "Tillage And Crop Residue Management Methods Had Minor Effects On The Stock And Stabilization Of Topsoil Carbon In A 30-Year Field Experiment", "description": "We studied the effects of tillage and straw management on soil aggregation and soil carbon sequestration in a 30-year split-plot experiment on clay soil in southern Finland. The experimental plots were under conventional or reduced tillage with straw retained, removed or burnt. Wet sieving was done to study organic carbon and soil composition divided in four fractions: 1) large macroaggregates, 2) small macroaggregates, 3) microaggregates and 4) silt and clay. To further estimate the stability of carbon in the soil, coarse particulate organic matter, microaggregates and silt and clay were isolated from the macroaggregates. Total carbon stock in the topsoil (equivalent to 200 kg m(-2)) was slightly lower under reduced tillage (5.0 kg m(-2)) than under conventional tillage (5.2 kg m(-2)). Reduced tillage changed the soil composition by increasing the percentage of macroaggregates and decreasing the percentage of microaggregates. There was no evidence of differences in the composition of the macroaggregates or carbon content in the macroaggregate-occluded fractions. However, due to the higher total amount of macroaggregates in the soil, more carbon was bound to the macroaggregate-occluded microaggregates in reduced tillage. Compared with plowed soil, the density of deep burrowing earthworms (Lumbricus terrestris) was considerably higher under reduced tillage and positively associated with the percentage of large macroaggregates. The total amount of microbial biomass carbon did not differ between the treatments. Straw management did not have discernible effects either on soil aggregation or soil carbon stock. We conclude that although reduced tillage can improve clay soil structure, generally the chances to increase topsoil carbon sequestration by reduced tillage or straw management practices appear limited in cereal monoculture systems of the boreal region. This may be related to the already high C content of soils, the precipitation level favoring decomposition and aggregate turnover in the winter with topsoil frost.", "keywords": ["lierot", "olki", "hiili", "01 natural sciences", "630", "soil aggregation", "kevennetty maanmuokkaus", "soil carbon", "particulate organic matter", "0105 earth and related environmental sciences", "2. Zero hunger", "maaper\u00e4", "stubble management", "reduced tillage", "04 agricultural and veterinary sciences", "viljelymaa", "ta4111", "15. Life on land", "kasvinviljely", "13. 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Meadow mesocosms were exposed to slightly elevated O 3  (40\u201350\u00a0ppb) and CO 2  (+100\u00a0ppm) in open-top chambers for three subsequent growing seasons (2002\u20132004). Decreased total, bacterial, actinobacterial, fungal PLFA biomass values as well as fungal:bacterial PLFA biomass ratio were measured after three growing seasons of fumigations with elevated O 3 . There were significant differences in the relative proportions of individual PLFAs between the control and elevated O 3  treatments. Moreover, enhanced O 3  alone and in combination with CO 2  modified the structure of the microbial community. The effects of elevated CO 2  given alone on PLFA profiles were negligible. Our results show that elevated O 3  alone and in combination with CO 2  even at moderate levels may cause changes in the biomass and composition of the microbial community in meadow soils, which may lead to functional changes in soil ecosystem processes.", "keywords": ["hiilidioksidi", "biomassa", "niityt", "soil", "open-top chambers", "ekosysteemit", "kohotettu O3", "otsoni", "microorganisms", "2. Zero hunger", "maaper\u00e4", "elevated CO2", "biomass", "carbon dioxide", "04 agricultural and veterinary sciences", "15. 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Through a mesocosm experiment, soil was amended with digestates from pilot-scale reactors and two concentrations of biochar produced by pyrolysis of digested sewage sludge and waste wood. The Germination Index (GI) assay assessed phytotoxicity on Lactuca sativa and Triticum aestivum seeds. Greenhouse gas emissions (CO2, CH4, N2O) measurements, soil characteristics analyses, and the study of microbial community structure enriched the study\u2019s depth. The GI assay revealed diverse responses among by-products, dilution rates, and plant types, highlighting the potential phyto-stimulatory effects of digestate and biochar water-extracts. While digestate proved to be effective as fertilizer, concerns arose regarding microbial contamination. Biochar application reduced Clostridiaceae presence in soil but unexpectedly increased N2O emissions at higher concentrations, emphasizing the need for further research on biochar\u2019s role in mitigating microbial impacts. CO2 emissions increased with digestate application but decreased with a 10% biochar concentration, aligning with control levels. CH4 uptake decreased with digestate and high biochar concentrations. The study underscores the importance of tailored approaches considering biochar composition and dosage to optimize soil greenhouse gas fluxes and microbial communities.</p></article>", "keywords": ["Technology", "m\u00e4d\u00e4te", "QH301-705.5", "QC1-999", "Clostridiaceae", "ravinteet", "01 natural sciences", "630", "333", "12. Responsible consumption", "greenhouse gas emission", "biochar", "Biology (General)", "microorganisms", "QD1-999", "0105 earth and related environmental sciences", "2. Zero hunger", "biohiili", "soil nutrient", "T", "Physics", "04 agricultural and veterinary sciences", "15. Life on land", "Clostridiae", "Engineering (General). Civil engineering (General)", "6. Clean water", "Chemistry", "kasvihuonekaasut", "13. 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