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选取中国北方地区典型的沙土和壤土,基于8场人工模拟降雨实验,研究不同坡度(10°和20°)、不同雨强(60和120 mm·h-1)土壤可蚀性对速效氮(AN)及速效磷(AP)流失的影响。结果表明:壤土的土壤可蚀性大于沙土,较大的土壤可蚀性导致产流、产沙、AN及AP流失;产流速率和产沙速率呈线性相关,其线性回归方程的斜率可以表征土壤可蚀性(R2>0.398,P<0.01);AN、AP的流失速率受产流及产沙速率的共同影响;土壤可蚀性对AN、AP流失速率的影响同样显著,其相关关系可以用对数函数表征。
Based on 8 artificial simulated rainfall experiments, the effects of soil erodibility at different slopes (10 ° and 20 °) and different rainfall intensities (60 and 120 mm · h-1) on available nitrogen AN) and available phosphorus (AP) loss. The results showed that the soil erodibility of loamy soil was greater than that of sandy soil, and the larger soil erodibility led to the loss of runoff, sediment yield, AN and AP. The runoff rate and sediment yield were linearly correlated, and the slope of linear regression equation could be characterized Soil erodibility (R2> 0.398, P <0.01). The runoff rate of AN and AP was affected by both runoff and sediment yield. The effect of soil erodibility on AN and AP runoff rates was also significant Characterize with logarithmic function.