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用土壤易受侵蚀程度、土壤质地(粘质、壤质、砂质)、4种土壤水文组(A、B、C、D)、管理措施(基本管理、加强管理)等因子对密西西比河上游流域的秸秆生产潜力进行了研究,并用“国家耕地保护效果评估项目评估数据库”的标准进行了评价。随着秸秆割除率的增加,土壤侵蚀和SOC损失增加,而粮食和秸秆产量、N和P损失降低。从基本管理处理看,易受侵蚀土地的秸秆产量略低于不易受侵蚀的土地,壤质土产量高于粘质土,砂质土最低,而土壤水文组D>B>C>A;对加强管理而言,可以减少土壤侵蚀和营养损失69%和57%。秸秆割除率对土壤质地反映最明显,其次是土壤水文组、再次是土壤易受侵蚀程度。
Soil erosion (including soil texture (clayey, loamy, sandy), four soil hydrology groups (A, B, C, D) and management measures (basic management, The straw production potential of the basin has been studied and evaluated using the criteria of the National Cultivated Land Conservation Assessment Project Assessment Database. With the increase of straw mulching rate, soil erosion and SOC loss increased while grain and straw yield, N and P loss decreased. From the perspective of basic management, the yield of straw in susceptible soil was slightly lower than that in the less vulnerable soil. The yield of loamy soil was higher than that of clayey soil, sandy soil was the lowest, while that of soil hydrology group was> B> C> A. In terms of better management, soil erosion and nutrient loss can be reduced by 69% and 57% respectively. Straw removal rate of the soil texture is most obvious, followed by the soil hydrology group, again the soil is susceptible to erosion.