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首页> 外文期刊>Soil Science Society of America Journal >Soil Physicochemical Properties in a Grassland and Agroecosystem Receiving Varying Organic Inputs
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Soil Physicochemical Properties in a Grassland and Agroecosystem Receiving Varying Organic Inputs

机译：草地和农业生态系统中有机输入变化对土壤理化特性的影响

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The application of organic amendments in agroecosystems has been widely recommended, but the impact of their C/N ratio on the stabilization and sequestration of soil organic carbon (SOC) is often unaccounted for. The influence of the C/N ratio of amendments on soil physicochemical properties in a rice (Oryza sativa var. NDR97)-barley (Hordeum vulgare var. Lakhan) rotation tropical dryland agroecosystem was compared with an undisturbed grassland. Chemical fertilizer in the form of urea and three organic inputs (Sesbania aculeata shoot, low C/N ratio; air-dried straw of wheat (Triticum aestivum var. Malviya 533), high C/N ratio; and S. aculeata shoot+wheat straw, high and low C/N ratio combined) carrying an equivalent amount of N, were added to plots of the agroecosystem once during each annual cycle. Soil water-holding capacity (WHC), porosity, SOC, total N, and aggregate stability were improved in the wheat straw and S. aculeata shoot+wheat straw treatments, reaching levels comparable with the grassland. Soil WHC, porosity, and SOC influenced the productivity of the grassland and the agroecosystem. The grassland recorded highest SOC (53% higher relative to control) followed by the wheat straw (+47%), S. aculeata shoot+wheat straw (+37%) and soil total N was greatest in the S. aculeata shoot+wheat straw treatment (+37.5%). Aggregate stability and macroaggregate distribution were also higher in the wheat straw and S. aculeata shoot+wheat straw treatments, however, the microaggregate and silt + clay fractions showed a reverse trend. Management practices with a higher residue-C return in the agroecosystem resulted in increased aggregate stability and aggregate-associated SOC, with C storage attaining levels similar to the natural system.
机译：广泛推荐在农业生态系统中使用有机改良剂，但往往无法解释其C / N比对土壤有机碳（SOC）稳定和隔离的影响。比较了水稻（Oryza sativa var。NDR97）-大麦（Hordeum vulgare var。Lakhan）自转热带旱地农业生态系统中改良剂的C / N比对土壤理化特性的影响。尿素和三种有机投入形式的化肥（Sesbania aculeata枝条，C / N比低;小麦的风干秸秆（Triticum aestivum var。Malviya 533），C / N比例高; S。aculeata枝条+小麦在每个年度周期中，一次将等量氮的高和低C / N比率的秸秆加到农业生态系统的地块中。小麦秸秆和短柄葡萄球菌+小麦秸秆处理的土壤持水量（WHC），孔隙率，SOC，总氮和团聚体稳定性均得到改善，达到与草地相当的水平。土壤WHC，孔隙度和SOC影响了草地和农业生态系统的生产力。草地的SOC最高（相对于对照高53％），其次是小麦秸秆（+ 47％），小球藻枝+小麦秸秆（+ 37％），土壤总氮在小球藻+小麦中最大。秸秆处理（+ 37.5％）。在小麦秸秆和小球菌芽+小麦秸秆处理中，骨料的稳定性和大骨料的分布也较高，但是，微骨料和粉砂+黏土组分显示出相反的趋势。在农业生态系统中，残留碳含量较高的管理实践导致了骨料稳定性的提高和与骨料相关的有机碳含量的增加，碳储存量达到了与自然系统相似的水平。

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