基于SHAW模型的黄土高原半干旱区农田土壤水分动态模拟  

Simulation of soil moisture dynamics in croplands using SHAW model in the semi-arid region of the Loess Plateau

作　　者：成向荣[1] 黄明斌[1] 邵明安[1] 

机构地区：[1]中国科学院水利部西北农林科技大学水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室

出　　处：《农业工程学报》2007年第11期1-7,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金(40471062);西北农林科技大学创新团队项目

摘　　要：黄土高原半干旱区土壤蒸发强烈,准确地掌握土壤水分动态对于旱地农业水分管理至关重要。应用基于物理基础的一维水热耦合SHAW（The Simultaneous Heat and Water）模型,模拟了陕西子洲岔巴沟流域1964～1967年土壤水分和土壤蒸发的动态特征,以及神木六道沟流域2006年坡地和梯田土壤水分变化。结果表明,除表层土壤水分模拟结果偏差较大,其他土层模拟值与实测值基本吻合,模拟期土壤水分模拟的相对平均绝对误差（Relatively Mean Absolutely Error,RMAE）为5.2%～11.4%。1964～1967年土壤累积蒸发量模拟值与实测值平均相对偏差为0.8%～6.1%,土壤蒸发的模拟值与实测值较为一致。因此,SHAW模型可以用于黄土高原半干旱区农田土壤水分动态规律研究。In the semiarid region of the Loess Plateau, soil evaporation strongly depletes soil water. It is crucial for soil water management in dryland farming to know the dynamics of soil moisture and soil evaporation. In this study, the Simultaneous Heat and Water（SHAW） model, a,one-dimensional canopy-residue-soil system with physical processes, was applied to simulate dynamics of soil moisture and soil evaporation in Chabagou basin of Zizhou County and Liudaogou basin of Shenmu County, Shaanxi province. The differences between simulated and measured values for surface soil moisture were larger than deep soil during 1964-1967 and 2006. For soil moisture simulation, the RMAE（Relatively mean absolutely error） was ranged from 5.2% to 11.4% during the same period. Average relative error between measured and simulated soil evaporation for approximately 200 days in 1964-1967 was ranged from 0. 8% to 6.1%. The above results showed that SHAW model could accurately estimate the dynamics of soil moisture in cropland in semiarid region of the Loess Plateau.

关 键 词：黄土高原 土壤水分 土壤蒸发 SHAW模型 

分 类 号：S152.7[农业科学—土壤学]