灌溉入渗条件下农田土壤水盐动态简化模型及应用  

THE SIMPLIFIED MODEL OF SALT-WATER REGIME IN CROPLAND SOIL UNDER INFILTRATION CONDITION AND ITS APPLICATION

作　　者：张妙仙[1] 杨劲松[1] 

机构地区：[1]中国科学院南京土壤研究所,南京210008

出　　处：《土壤学报》2002年第1期81-88,共8页Acta Pedologica Sinica

基　　金：国家重点基础研究发展规划项目G1 9990 1 1 80 3支持

摘　　要：率先采用线性简化式 ,并引入优先流系数来表示计算土层下边界渗漏水流通量 ;然后导出了计算土层入渗前后土壤储水量变化公式 ,在此基础上又引入淋洗系数 ,导出了入渗前后土壤储盐量变化公式。通过对公式的讨论 ,提出了灌溉水矿化度临界方程 ,讨论了淋洗系数和优先流系数的物理意义和影响因素。本文所建模型简单适用 ,而且与田间实测灌溉水矿化度临界方程极其吻合 。In this paper,the lower boundary flow of considered upper soil stratum was expressed into linear relation with infiltration ratio and saturated degree by introducing preferential flow coefficient. So according to principle of salt water balance,the water deposit formula and salt deposit formula was conducted out by introducing leaching coefficient. Through discussing above formulas,the critical mineralization degree equation of irrigation water was presented. The physical significance and affected factors of the preferential flow coefficient and leaching coefficient were discussed. The salt water regime model is simple and suitable for farmland irrigation management,the critical mineralization degree equation of irrigation water maybe provide reference for option of mineralization degree of irrigation water.\;

关 键 词：入渗 水盐动态模型 灌溉水矿化度 临界方程 优先流系数 淋洗系数 

分 类 号：S152.72[农业科学—土壤学] S274[农业科学—农业基础科学]