麦田降雨产流时间计算模型研究

为探讨多种因素对麦田降雨产流时间的影响及其相应的定量关系,通过模拟降雨试验,研究了麦田降雨强度、冠层覆盖及初始土壤剖面含水量对降雨产流时间的影响。结果表明,在相同初始土壤剖面含水状态条件下,降雨强度与产流时间呈显著幂函数关系(P<0.01);产流时间与叶面积指数呈极显著线性正相关(P<0.01),与株高相关性较差;0～20、0～40cm土层初始土壤剖面含水量与产流时间具有较明显的线性正相关关系(P<0.01),40cm以下土层土壤含水量对产流时间影响相对较小。通过多元回归分析建立的产流时间幂函数计算模型具有较好的模拟效果。

Study on Calculation Model of Time Producing Runoff in Winter Wheat Farmland

In order to study the effects of several influence factors on time producing runoff and the corresponding quantitative relationships, the influence of rainfall intensity, canopy cover and initial soil moisture profile on the time producing runoff in the winter wheat farmland was studied by simulated rainfall. The results indicated that in the same initial soil moisture profile conditions, the rainfall intensity and time producing runoff was a significant power function (P<0.01). Correlation function between Leaf area index (LAI) and time producing runoff was linear, and reached a significant level, but plant height associated poorly with time producing runoff. The soil moisture at 0~20 cm, 0~40 cm showed more obvious positive linear correlation with time producing runoff (P<0.01), the effect of initial soil moisture below 40 cm on the time producing runoff was relatively smaller. Considering all factors, through multiple regression analysis, calculation power of function model for time producing runoff in the winter wheat farmland was established. Upon examination, the model had good simulation results.