黄壤耕层土壤性质的空间分布特征

Spatial distribution characteristics in the plowed layer of yellow earth

应用空间自相关函数、变异函数和分数布朗运动研究了四川雅安黄壤耕层的重量含水量、容重、粘粒含量、pH、有效磷含量和有效钾含量的空间分布特征。结果表明 ,黄壤耕层这 6项性质的空间自相关特性和变异性都较明显。它们的自相关范围与变程基本相当 ,介于 3 0～ 60m之间。分数布朗运动的无标度区间位于自相关范围或变程中。这 6项土壤性质的分形维数为 2 3 895～ 2 885 3 ,空间分布特征为pH均一性程度最好 ,空间变异最小 ;有效钾的均一性程度最差 ,空间变异最大 ;其余 4项性质介于前二者之间。

The spatial distribution characteristics of gravimetric water,bulk density,clay content,pH,available phosphorus and available potash were studied by spatial autocorrelation,semivariance and fractional Brownian motion in the the plowed layer of yellow earth in Ya′an,Sichuan The results showed that the autocorrelation and variabilities of the properties were significant Their autocorrelation scopes were almost the same as to the ranges of semivariances from 30?m to 50?m The No scale intervals of fractional Brownian motion of the properties were in the middle of the autocorrelation scopes or the ranges of semivariances The fractal dimensions of the soil properties were situated between 2 3895 and 2 8853 The spatial variance of pH was the lowest,and that of available potash the highest The spatial variances of the other properties were situated between them