不同羊柴密度下风沙土有机碳和全氮含量的空间异质性

The Spatial Heterogeneity of Organic Carbon and Total Nitrogen Contents in Sand Soil under Different Densities of Hedysarum Mongdicum Communities

运用Matlab 7.0和ArcGis 9.3软件对三种密度羊柴(Hedysarum mongdicum)下沙地土壤有机碳与全氮含量进行了地统计学空间异质性分析。土壤有机碳与全氮含量为112~381 g kg-1及0.13~0.37 g kg-1。各层沙地土壤有机碳的空间异质性随羊柴密度的增加而下降,全氮含量的空间异质性则先下降后上升。低密度羊柴沙地土壤有机碳含量存在空间自相关变化的最大范围较小,最小为15.25 m,土壤全氮含量的变程较大,最大达38.42 m。中高密度羊柴沙地内土壤有机碳含量存在空间自相关变化的最大范围较大,最大达31.49 m,土壤全氮含量的变程较小,最小为8.43 m。羊柴盖度的空间分布异质化过程与土壤有机碳和全氮含量的空间分布异质化过程一致。

By using software Matlab 7.0, software ArcGis 9.3 and geo-statistical analysis tool, the spatial heterogeneity of the organic carbon content and total nitrogen content of the sand soil under three density of Hedysarum mongdicum communities were studied. Soil organic carbon content and total nitrogen content were112-381 g kg-1and 0.13-0.37 g kg-1, respectively. The spatial heterogeneity of the sand soil organic carbon content decreased along with the increase of Hedysarum mongdicum density, the spatial heterogeneity of the sand soil total nitrogen contents decreased firstly, and then increased with the rise of Hedysarum mongdicum density. In the low density of Hedysarum mongdicum sand, the autocorrelation distance of soil organic carbon content was low, and its minimum value was 15.25 m; the autocorrelation distance of soil total nitrogen content was high, with a maximum value of 38.42 m. In the middle and high densities of Hedysarum mongdicum sands, autocorrelation distance of soil organic carbon content was high, and the maximum value was 31.49 m; autocorrelation distance of soil total nitrogen content was low, its minimum value was 8.43 m. The spatial distribution heterogeneity of Hedysarum mongdicum was consistent to the spatial distribution heterogeneity of the soil organic carbon content and total nitrogen content. The results would provide a theory basis for sand protection and governance.