摘要
通过烘干法测得土壤含水率,通过张力计法测得土壤水吸力,得到土壤水分特征曲线的一些实测数据。借助Matlab软件,代入实测数据,对Gardner模型、Van-Genuchten模型、Mckee-Bumb模型和Frdlund-Xing模型4种经验公式研究进行参数拟合,并分析拟合相关系数,得到适用于黏土的土壤水分特征曲线公式。结果表明,Van-Genuchten模型、Frdlund-Xing模型、Mckee-Bumb模型、Gardner模型参数拟合相关系数分别为0.994 1,0.993 6,0.964 4,0.936 6;Van-Genuchten模型参数拟合效果最好,Frdlund-Xing模型参数拟合效果次之,二者均可用来描述黏土土壤水分特征曲线的经验公式;而Mckee-Bumb模型和Gardner模型参数拟合效果差,是不适合描述黏土土壤水分特征曲线的经验公式。
By the dry method measuring soil moisture and tensiometer method measuring soil water suction, some measured data of soil water characteristic curve were got. With the aid of Matlab software, the parameters of the Gardner model, the Van-Genuchten model,the Mckee-Bumb model and the Frdlund-Xing model were fitted to the measured data by substituting the measured data into four kinds of empirical formulas. The fitting correlation coefficient was analyzed and the soil water characteristic curve formula applicable to clay was obtained. The result showed that the correlation coefficients of model parameters of the Van-Genuchten model, Frdlund-Xing model,Gardner model, Mckee-Bumb model were 0.994 1, 0.993 6, 0.936 6, 0.964 4, respectively. The Van-Genuchten model had the best fitting effect, and the fitting effect of Frdlund-Xing model was second. Both could be used to describe the empirical formula of clay soil water characteristic curve. The Mckee-Bumb model and the Gardner model had poor fitting effect, which were not suitable for describing the empirical formula of clay soil water characteristic curve of the experimental study.
出处
《山西农业科学》
2018年第2期256-259,共4页
Journal of Shanxi Agricultural Sciences
基金
山西省科技攻关项目(20120311035)
