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运用小型野外便携式人工模拟降雨装置研究了林地、农地、裸地诸因子（坡度、承雨强度、土壤初始含水率、林地植被盖度、枯落层厚度）对产流历时的影响。研究发现，林地影响产流历时的主要因子为承雨强度和植被盖度；农地、裸地则为承雨强度、坡度和土壤初始含水率。建立了不同土地利用方式下影响产流历时的单因子、多因子回归方程。通过方程，由植被盖度、坡度、土壤初始含水率和承雨强度四个易于获得的因子可预测不同土地利用方式下的径流发生时间。地表结皮的形成对产流历时的影响以裸地表现最甚，其次为农地，林地影响不大。
The effects of factors such as forest land, farmland and bare land (slope, rainfall intensity, initial soil water content, vegetation cover of forest land and thickness of litter layer) on runoff duration were studied by using a small portable outdoor simulated rainfall unit. The study found that the main factors influencing runoff production in forestland are the rainfall intensity and vegetation cover, and the agricultural land and bare land are the rainfall intensity, slope and soil initial water content. The single-factor and multi-factor regression equations that affect the runoff time under different land use patterns are established. Through the equation, we can predict the runoff occurrence time under different land use patterns by using four easy-to-obtain factors: vegetation cover, slope, initial soil water content and rainfall intensity. The formation of surface crust on the runoff time to nude performance of the worst, followed by agricultural land, forest land has little effect.