亚热带小流域稻田土壤饱和导水率传递函数构建  

Developing a Pedo-transfer Function for Estimating Saturated Soil Hydraulic Conductivity of Paddy Soils of a Catchment in Southern Subtropical China

作　　者：邹刚华[1,2] 李勇[1] 李裕元[1] 彭佩钦[2] 韩例娜[3] 吴金水[1] 

机构地区：[1]亚热带农业生态过程重点实验室,中国科学院亚热带农业生态研究所,湖南长沙410125 [2]中南林业科技大学,湖南长沙410004 [3]西安建筑科技大学,陕西西安710055

出　　处：《土壤通报》2013年第2期302-307,共6页Chinese Journal of Soil Science

基　　金：中国科学院创新团队(KZCX2-YW-T07);“百人计划”项目共同资助

摘　　要：土壤传递函数法是水文模型应用中水动力学参数获取的比较有效的方法之一,对于水文模型预测精度的提高具有重要意义。本文以亚热带小流域稻田土为研究对象,采集原状土柱并分层测定其饱和导水率(K)s及理化性质,利用多元逐步回归法建立Ks的土壤传递函数(PTF)且进行对比验证。结果显示:Ks与容重和有机质关系最密切,选用包括容重、有机质、砂粒、黏粒含量以及颗粒组成的标准偏差(GSD)等土壤变量,构建了稻田Ks土壤传递函数模型,模型确定系数(R2)为0.67(n=50,P<0.001)。验证分析表明除了Aimrun模型外都较大地高估了Ks,本试验所建立的模型预测结果较好,GMER值较接近1。该模型对于南方稻田土壤水分与溶质运移以及面源污染风险预测模型参数的精确估测将发挥十分关键的作用。The application of pedo-transfer functions （PTF）, an effective way to estimate soil hydraulic parameters for hydrological modeling, plays a crucial role in ensuring the accuracy of the hydrological modeling exercises. We chose paddy fields of a catchment in southern subtropical China, and collected 19 intact soil columns. With these soil columns, saturated soil hydraulic conductivity （Ks） and soil physical and chemical properties （SPCP） at depths were determined, and the multiple stepwise linear regression analysis was applied to develop a PTF for estimating Ks, which being validated too. The result indicated that Ks was closely correlated with soil bulk density and soil organic matter. The derived PTF had soil bulk density, soil organic matter, sand content, clay content and GSD of soil particle size distribution as predictors, and could explain over 60% of variations of Ks. In comparison with other widely-used PTFs, our PTF outperformed in all assessment criteria. An appropriate deployment of the PTF derived may play an important role in accurately estimating regional Ks for modeling soil water movement and solute transport, as well as for evaluating the environmental risk of diffusive agricultural pollution by rice production in the subtropical regions of southern China.

关 键 词：土壤理化性质 传递函数 稻田 小流域 饱和导水率 

分 类 号：S152.7[农业科学—土壤学]