摘要
用水头法和压力膜法测定了分布于辽宁西北部彰武县的风沙土0～20cm、20～40cm上下两层120个土壤样品的水分特征曲线,用V.G.模型对该水分特征曲线进行拟合,并用经典统计和地统计学方法对模型参数的空间变异性进行探讨。结果表明:上层供试土样水分特征曲线V.G.模型参数全部服从正态分布,即可以V.G.模型参数的平均值使用V.G.模型绘制一条该供试土样的代表性的水分特征曲线;上下层土壤V.G.模型各参数半方差模型的块金值均为正值,采用克里格插值绘图可直观地描述V.G.模型参数空间变异情况。这对简化水分特征曲线的计算和定量讨论土壤的持水特性具有重要的指导意义。
The soil water characteristic curves of 120 soil samples at the depth of 0-10 and 20-40 cm was determined by waterhead and pressure plate method, and was simulated by V.G. model. The spatial variability of V.G. model parameters of aeolian sandy soil was discussed by describing statistics and geostatistics. Results showed that V.G. model parameters on the upper layer belonged to normal distribution, which indicate that water charactersitic curves of experimental soll could be described by the mean value of V.G. model parameters.The Nugget of semivaiance model of each V.G. model parameters was a positive value.The spatial variability of V.G. model parameters could be described directly with Kriging interpolation polynomials.
出处
《沈阳农业大学学报》
CAS
CSCD
北大核心
2008年第3期318-323,共6页
Journal of Shenyang Agricultural University
基金
辽宁省自然科学基金项目(20022079)
关键词
风沙土
V.G.模型
空间变异性
半方差
aeolian sandy soil
V.G. model
spatial variability
semivariance
