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运用人工模拟降雨装置研究了暴雨条件下苏南典型丘陵土壤上纯草、纯灌、灌草3种经营模式下坡度、降雨强度、土壤前期含水量、植被覆盖度对开始产生径流时间的影响。研究表明:纯草模式下影响开始产流时间的最主要因子为土壤前期含水量,同时建立了3种植被组合下影响开始产流时间的多因子回归方程。通过方程,由植被覆盖度、坡度、土壤前期含水量和降雨强度四个易于获得的因子可预测不同植被组合下开始产生径流的时间。
The artificial simulated rainfall unit was used to study the effect of slope gradient, rainfall intensity, pre-soil water content and vegetation coverage on the initial runoff time under pure grass, pure irrigation and shrub-grass management in the typical hilly soils of southern Jiangsu Province under heavy rain conditions. The results showed that the main factor influencing the initial runoff time in the pure grass model was the pre-soil water content, and the multivariate regression equation was established to affect the start of runoff time under the three vegetation combinations. Through equations, four easy-to-obtain factors, including vegetation cover, slope, pre-soil water content and rainfall intensity, can predict the time when runoff can begin to occur under different vegetation combinations.