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定量评价水土保持措施在防治土壤侵蚀中的作用(因子值)是土地利用和水土保持规划的重要依据。运用位于典型西南喀斯特地区3个野外径流场的实测土壤侵蚀数据,计算不同水土保持措施的B、E、T因子值及等高耕作条件下主要农作物——马铃薯、玉米在不同生长阶段的T因子值,结果表明:B因子值介于0.000 7~0.023 4之间,等高耕作条件下马铃薯作物小区T因子值(0.087 2)大于玉米作物小区(0.006 9),水平梯田措施E因子值为0.124 4;等高耕作条件下马铃薯、玉米在不同生长时期的T因子值大小关系为苗期>发育期>残茬期>成熟期,马铃薯在发育期、成熟期、残茬期的T因子值为玉米在相应时期的10倍左右。
Quantitative evaluation of the role of soil and water conservation measures in soil erosion control (factor value) is an important basis for land use and water and soil conservation planning. Based on the measured soil erosion data of three wild runoff fields in the typical southwest karst area, the B, E and T values of different soil and water conservation measures and the T-factor of potato, corn at different growth stages The results showed that the value of factor B was between 0.000 7 and 0.023 4, the value of T factor (0.087 2) in potato crop was higher than that of corn crop (0.006 9) under contour cultivation, and the value of E factor of horizontal terrace was 0.124 The T factor value of potato and corn at different growth stages under the conditions of contour tillage was the relationship between the seedling stage, the development stage, the stubble stage and the maturity stage, and the T factor of the potato in the development stage, mature stage and stubble stage was Corn in the corresponding period of about 10 times.