{"type": "FeatureCollection", "features": [{"id": "10.1016/j.agee.2017.10.023", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-07-28T16:15:45Z", "type": "Journal Article", "created": "2017-11-07", "title": "Critical review of the impacts of grazing intensity on soil organic carbon storage and other soil quality indicators in extensively managed grasslands", "description": "Livestock grazing intensity (GI) is thought to have a major impact on soil organic carbon (SOC) storage and soil quality indicators in grassland agroecosystems. To critically investigate this, we conducted a global review and meta-analysis of 83 studies of extensive grazing, covering 164 sites across different countries and climatic zones. Unlike previous published reviews we normalized the SOC and total nitrogen (TN) data to a 30\u00a0cm depth to be compatible with IPCC guidelines. We also calculated a normalized GI and divided the data into four main groups depending on the regional climate (dry warm, DW; dry cool, DC; moist warm, MW; moist cool, MC). Our results show that taken across all climatic zones and GIs, grazing (below the carrying capacity of the systems) results in a decrease in SOC storage, although its impact on SOC is climate-dependent. When assessed for different regional climates, all GI levels increased SOC stocks under the MW climate (+7.6%) whilst there were reductions under the MC climate (-19%). Under the DW and DC climates, only the low (+5.8%) and low to medium (+16.1%) grazing intensities, respectively, were associated with increased SOC stocks. High GI significantly increased SOC for C4-dominated grassland compared to C3-dominated grassland and C3-C4 mixed grasslands. It was also associated with significant increases in TN and bulk density but had no effect on soil pH. To protect grassland soils from degradation, we recommend that GI and management practices should be optimized according to climate region and grassland type (C3, C4 or C3-C4 mixed).", "keywords": ["330", "QH301 Biology", "630", "Article", "QH301", "NE/M021327/1", "Grazing intensity", "SDG 13 - Climate Action", "grazing", "2. Zero hunger", "Soil organic carbon", "Natural Environment Research Council (NERC)", "NE/P019455/1", "04 agricultural and veterinary sciences", "15. Life on land", "Grassland", "soil organic carbon", "Grazing", "grazing intensity", "total nitrogen", "13. 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The main objectives of this critical global review and systematic analysis were to assess cover crop practices in the context of their impacts on nitrogen leaching, net greenhouse gas balances (NGHGB) and crop productivity. Only studies that investigated the impacts of cover crops and measured one or a combination of nitrogen leaching, soil organic carbon (SOC), nitrous oxide (N2O), grain yield and nitrogen in grain of primary crop, and had a control treatment were included in the analysis. Long\uffe2\uff80\uff90term studies were uncommon, with most data coming from studies lasting 2\uffe2\uff80\uff933\uffc2\uffa0years. The literature search resulted in 106 studies carried out at 372 sites and covering different countries, climatic zones and management. Our analysis demonstrates that cover crops significantly (p\uffc2\uffa0&lt;\uffc2\uffa00.001) decreased N leaching and significantly (p\uffc2\uffa0&lt;\uffc2\uffa00.001) increased SOC sequestration without having significant (p\uffc2\uffa0&gt;\uffc2\uffa00.05) effects on direct N2O emissions. Cover crops could mitigate the NGHGB by 2.06\uffc2\uffa0\uffc2\uffb1\uffc2\uffa02.10\uffc2\uffa0Mg CO2\uffe2\uff80\uff90eq\uffc2\uffa0ha\uffe2\uff88\uff921\uffc2\uffa0year\uffe2\uff88\uff921. One of the potential disadvantages of cover crops identified was the reduction in grain yield of the primary crop by \uffe2\uff89\uff884%, compared to the control treatment. This drawback could be avoided by selecting mixed cover crops with a range of legumes and non\uffe2\uff80\uff90legumes, which increased the yield by \uffe2\uff89\uff8813%. These advantages of cover crops justify their widespread adoption. However, management practices in relation to cover crops will need to be adapted to specific soil, management and regional climatic conditions.</p>", "keywords": ["Crops", " Agricultural", "net greenhouse gas balance", "330", "Supplementary Data", "Nitrogen", "QH301 Biology", "Supplementary data available", "12. Responsible consumption", "Nitrous oxide emissions", "QH301", "Greenhouse Gases", "Soil", "N content", "nitrate", "C sequestration", "N leaching", "Environmental Chemistry", "General Environmental Science", "NE/M019691/1", "2. Zero hunger", "Global and Planetary Change", "Catch crop", "Ecology", "Soil organic carbon", "green manure", "Natural Environment Research Council (NERC)", "Research Review", "Agriculture", "04 agricultural and veterinary sciences", "15. Life on land", "yield", "Crop Production", "13. 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