应用农田水量平衡模型估算土壤水渗漏量

建立了一个农田水量平衡模型。并据于模型假设的条件,模拟计算了在冬小麦-夏玉米及冬小麦-裸地条件下历年1m土层土壤水渗漏量。结果表明,土壤水渗漏量与季节内降水量呈正相关,但在不同作物种植制度下有不同的相关关系式。不同水文频率年型下的渗漏量具有明显的差异,湿润年型下比干旱年型下的渗漏量多70～140mm,冬小麦-裸地比冬小麦～夏玉米种植条件下的渗漏量多30～50mm。

Using Field Water Balance Model to Estimate the Percolation of Soil Water

A field water balance model has been developed in this paper. With the assumed boundary conditions,the long-term annual percolation of soil water (PSW) is simulated for one-meter depth soil horizon for cropping systmes of winter wheat/summer maize and winter wheat/bare soil. The results show that PSW is expressed as a linear function of seasonal precipitation,which is different in various cropping systems. PSW changes significanly in different hydrologic year types, which is 70~140mm more in humid years than in dry years. While in the winter wheat/bare soil it is 30~50mm more than in the winter wheat/summer maize.