轻质土壤水分特征曲线估计的简便方法

以黄淮海平原封丘地区的潮土和风沙土为研究对象,根据大量的土壤基本物理性质和土壤持水数据,利用多元逐步回归分析方法,建立了轻质土壤在不同基质势下土壤含水量(θ)的传递函数模型,并进行了模型验证。结果表明,利用轻质土壤的基本物理性质估计其水分特征曲线是一种简便可行的方法,并且,在回归方程中,增加-30kPa含水量项可提高-30kPa以上土壤含水量的估计精度;增加-1500kPa含水量项可以明显提高-100kPa至-1500kPa间土壤含水量的估计精度。

A Simple Method to Estimate Water Retention Curves of Light-textured Soil

Based on a number of fundamental soil physical properties and soil water retention data, some pedo-transfer functions of water content in different matric potentials have been constructed and validated with regard to fluvo-aqic and eolian sandy soils in Fengqiu County, Huanghuaihai plain area by multivariate stepwise regression analysis. The results showed that it is a simple and feasible method to estimate water retention curves using basic physical properties of light-textured soil. In the regression equations, estimation accuracy of soil water content above -30kPa potential was enhanced by incorporating the measured soil water content at -30kPa potential as an additional independent variable, and estimation accuracy of soil water content from -100kPa to -1500kPa potential was enhanced obviously by incorporating the measured soil water content at -1500kPa potential as an additional independent variable.