两种模型对土壤水分特征曲线拟合的比较分析  

Comparative Analysis of Two Models Fitting Soil Moisture Characteristic Curve

作　　者：朱蔚利[1] 肖自幸[1] 牛健植[1] 邵文伟[1] 张由松[1] 李想 武晓丽[1] 赵玉丽[1] 

机构地区：[1]北京林业大学水土保持与荒漠化防治教育部重点实验室北京林业大学水土保持学院,北京100083

出　　处：《湖南农业科学》2011年第9期47-51,共5页Hunan Agricultural Sciences

基　　金：国家青年自然科学基金(30800888)

摘　　要：土壤水分特征曲线可以表示出土壤水的能量和数量之间的关系。以鹫峰国家森林公园土壤为例,用Van-Genuchten模型和土壤水分特征曲线单一参数模型拟合土壤水分特征曲线,结果表明:Van-Genuchten模型拟合的精度高,参数的物理意义明确,但工作量大;单一参数模型拟合精度比Van-Genuchten模型拟合精度约低一个数量级,但也能较准确地拟合土壤水分特征曲线,并且其参数可反映空间变异性,以及工作量小。两个模型均可用于拟合鹫峰国家森林公园土壤水分特征曲线,可根据不同情况选用。Soil moisture characteristic curve gives a description of the relationship between water energy and water quantity in soil. Taking the soil from Jiufeng National Forest Park as sample to fitting the soil moisture characteristic curve with the Van-Genuchten model and the one-parameter model. The results showed that the Van-Genuchten model had high fitting precision, and its parameters had clear physical meaning, but had a heavy workload; the one-parameter model had about an order of magnitude lower accuracy than Van-Genuchten model, but it can also fit well with the soil moisture characteristic curve, and its parameter can reflect the spatial variability, at the same time had the small workload. The both models can be used for fitting soil moisture characteristic curve of soil from Jiufeng National Forest Park, and can be selected according to different situations.

关 键 词：土壤水分特征曲线 Van—Genuchten模型 单一参数模型 

分 类 号：S152.7[农业科学—土壤学]