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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。研究结果可为沙地保护和治理提供理论依据
Geostatistical spatial heterogeneity of soil organic carbon and total nitrogen in sandy land under three Hedysarum mongdicum species was analyzed using Matlab 7.0 and ArcGIS 9.3 software. Soil organic carbon and total nitrogen content were 112-381 g kg-1 and 0.13-0.37 g kg-1. Spatial heterogeneity of soil organic carbon in sandy land decreased with the increase of sheepwood density, while the spatial heterogeneity of total nitrogen increased first and then decreased. The minimum range of spatial autocorrelation of soil organic C in low-density sheep was 15.25 m, and the range of total nitrogen was 38.42 m. The maximum range of spatial autocorrelation of soil organic carbon in middle-density and high-density sheep was larger, up to 31.49 m. The range of soil total nitrogen was smaller, with a minimum of 8.43 m. The spatial heterogeneity of the biomass of sheep was consistent with the spatial heterogeneity of soil organic carbon and total nitrogen. The research results can provide theoretical basis for the protection and governance of sandy land