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以广州郊区岑村为例,采用G IS与地统计学相结合的方法对城郊耕层土壤(0~20cm)的有机质、全N、全P和全K4种土壤养分要素的空间变异特征进行了分析。结果表明:有机质、全N和全K变异函数曲线的最优理论模型为指数模型;全P为球状模型。几种土壤养分具有很强的空间相关性,异质性特征。各土壤养分由随机因素引起的空间变异占空间总变异的比例小,其值分别为9.90%、8.80%、0.26%和17.10%。说明受母质、地形、土壤类型等自然的结构性因素影响较大。土壤特性的相关距变化范围为139.00~750.00m。该成果可为城郊农业的定位施肥、灌溉以及其它的农田精细管理提供依据。
Taking Cencun, a suburb of Guangzhou, as an example, the spatial variability of soil organic matter, total N, total P and total K4 nutrients in subsoil soils (0 ~ 20cm) was studied by G IS and geostatistics analysis. The results show that the optimal theoretical model for the curves of organic matter, total N and total K is an exponential model; the whole P is a spherical model. Several soil nutrients have strong spatial correlation and heterogeneity. The variance of spatial variability caused by random factors in soil nutrients accounted for 9.90%, 8.80%, 0.26% and 17.10% of the total variance respectively. It shows that the natural structural factors such as parent material, topography and soil type have a great influence. The correlation range of soil characteristics ranged from 139.00 to 750.00 m. The results can provide the basis for the suburban agriculture, fertilization, irrigation and other fine management of farmland.