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以河南省封丘县为研究区,利用ArcGIS 9.2的地统计分析模块研究了该区土壤养分的空间变异性。结果表明,河南省封丘县0—20cm耕层土壤中有机质、速效钾、铵态氮含量(经对数转换后)均服从正态分布,有机质的变异系数最高(0.665 6),铵态氮的居中(0.411 6),速效钾系数最小(0.321 3),均属于中等强度变异。空间结构性分析表明,铵态氮较好地符合指数模型分布,速效钾符合球状模型,有机质符合高斯模型。普通Kriging插值的结果可知,有机质、铵态氮空间分布表现为条带状格局,速效钾表现为斑块状的格局。有机质空间分布为沿东北—西南的中间带分布较高;速效钾为中部偏北地区分布较高,东南方向地区分布较低;铵态氮呈现出西北高,东南低的趋势。
Taking Fengqiu County of Henan Province as the research area, the spatial variability of soil nutrients in this area was studied using the geostatistical analysis module of ArcGIS 9.2. The results showed that the contents of organic matter, available potassium and ammonium nitrogen in 0-20 cm topsoil (converted logarithmically) in Fengqiu County of Henan Province all obeyed a normal distribution with the highest coefficient of variation (0.665 6), ammonium nitrogen (0.411 6) and the smallest available potassium coefficient (0.321 3), all belong to the medium intensity variation. Spatial structural analysis shows that the ammonium nitrogen is in good agreement with the exponential model distribution, available potassium conforms to the spherical model, and the organic matter complies with the Gaussian model. The result of ordinary Kriging interpolation shows that the spatial distribution of organic matter and ammonium nitrogen shows a striped pattern and the available potassium shows a patchy pattern. The spatial distribution of organic matter is highly distributed along the northeastern-southwest intermediate zone. Available potassium is highly distributed in the central part of the central part of the country and lower in the southeast part. The ammonium nitrogen shows a trend of high in the northwest and low in the southeast.