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在GIS支持下,运用地统计学方法分析了耕层土壤全氮的空间变异特征,并在此基础上利用Kriging插值方法绘制了土壤全氮的空间分布图。结果表明,在步长间隔60m下,土壤全氮具有较强的空间相关性,其相关距离为208m。在NE30°、NE120°两个方向上具有典型的几何异向性结构特点;在NE60°、NE150°两个方向上具有典型的带状异向性结构特点。Kriging插值结果表明,研究区土壤全氮的空间分布表现为条带状和斑块状分布。土壤全氮高值斑块区的分布与地势相对低洼的地形部位相吻合。地形是影响土壤全氮空间变化的主要因素。
With the support of GIS, the spatial variability of soil total nitrogen in topsoil was analyzed by using geostatistics method. Based on this, Kriging interpolation method was used to draw the spatial distribution map of soil total nitrogen. The results showed that soil total nitrogen had a strong spatial correlation at a step interval of 60m with a correlation distance of 208m. In the NE30 °, NE120 ° two directions with typical geometric anisotropy structural features; NE60 °, NE150 ° in both directions with a typical banded anisotropy structural features. The results of Kriging interpolation show that the spatial distribution of soil total nitrogen in the study area is striped and patchy. The distribution of soil total nitrogen high patch area is consistent with the relatively low lying topography. Topography is the main factor affecting the spatial variation of soil total nitrogen.