沈阳城市土壤全钾和碱解氮的空间变异性

采用地统计学和地理信息系统（GIS）相结合的方法研究了沈阳城市土壤全钾、碱解氮2种土壤养分的空间变异性.结果表明：全钾的最佳拟合模型为指数模型，碱解氮的最佳拟合模型为高斯模型；其块金值/基台值［C₀/(C₀+C)］分别为10.65%和17.96%，说明沈阳城市土壤全钾和碱解氮的空间相关性较强，其空间变异主要是由结构性因素引起的.通过克立格插值对沈阳城市土壤全钾和碱解氮的空间分布特征进行分析发现：全钾的空间分布没有明显的规律性；碱解氮的空间分布则为周边高、城区中部低.

Spatial variability of soil total K and available N in Shenyang urban area.

Geostatistics combined with geographical information system (GIS) was applied to analyze the spatial variability of soil total K and available N in urban area of Shenyang City. The results showed that the theoretical semivariogram models of soil total K was best described by an exponential model, while soil available N was best fitted by a Gaussian model. The ratios of nugget to sill of soil total K and available N were 10.65% and 17.96%, respectively, indicating that there existed significant spatial correlations between soil total K and available N, and the spatial variability was mainly caused by structural factors. The spatial distributions of soil total K and available N in urban area of Shenyang were analyzed by kriging interpolation, and it was found that the content of soil total K had no definite spatial distribution pattern, while the content of soil available N was higher in the around and lower in the middle of the city.