京西山地土壤水分特征数据的拟合与分析

Curve Fitting and Analysis for Soil Water Characteristic Data of Beijing Xishan Mountain

采用Ｃ语言和Ｆｏｘｐｒｏ数据库，根据Ｂｒｏｏｋｓ和Ｃｏｒｅｙ，Ｇｅｎｕｃｈｔｅｎ的土壤水分特征曲线模型，编制成《土壤水分特征曲线拟合软件》，用该软件完成了北京林业大学妙峰山林场土壤水分特征曲线的拟合及其图形与数据文本的制作，并分析了该地土壤的水分特性．结果表明，采用土壤水分特征曲线上－１．５ＭＰａ下的含水量近似代替残留含水量与从水分特征曲线拟合得到的残留含水量相比差异较大；采用Ｂｒｏｏｋｓ和Ｃｏｒｅｙ模型拟合的土壤水分特征曲线，相关指数均在０．９９以上；所有试验地之间，水分特征数据无显著差异．

A software of The Module of Soil Water Conservation Curve Fitting was programmed on the basis of C language and Foxpro as well as Brooks, Corey and Genuchten soil water retention curve models. The software was used to fit the soil water retention curve of Miaofengshan Fores Farm of Beijing Forestry University and produce the graphs and data text. It was also used to analyse the soil water characteristics in this area. It was pointed out that the value of soil residual water content produced by the computer was different with the adoption that replacing soil water content that below -1.5MPa with the soil residual water content. The or relation indexes of soil water retention curve fitted by the Brooks and Corey model are higher than 0.99.There was no rema rkable difference among all experimental sites.