沈阳城市土壤pH和养分的空间变异性研究  

Spatial Variability of Soil pH-value and Nutrient in Shenyang City

作　　者：张宏伟[1] 魏忠义[1] 王秋兵[1] 

机构地区：[1]沈阳农业大学土地与环境学院,辽宁沈阳110161

出　　处：《江西农业学报》2008年第5期102-105,共4页Acta Agriculturae Jiangxi

基　　金：国家自然科学基金重点项目(40235054)

摘　　要：采用地统计学和地理信息系统(G IS)相结合的方法研究了沈阳城市土壤pH、全磷和速效钾的空间变异特征。结果表明:pH、全磷、速效钾的最佳拟合模型为指数模型。全磷、速效钾的C0/(C0+C)分别为10.62%、9.94%,说明沈阳城市土壤全磷和速效钾的空间相关性较强,其空间变异主要是结构性因素引起的;pH的C0/(C0+C)为44.25%,说明土壤pH具有中度的空间相关性,其空间变异是由随机性因素和结构性因素共同引起的。最后通过克里格插值分析沈阳城市土壤pH、全磷和速效钾的空间分布特征。Geo- statistics combined with Geographical Information System （GIS）was applied to analyze the spatial variability of soil pH-value and soil nutrients including total P,available K in Shenyang city. The results showed that theoretical semivariogram models of pH -value, total P and available K were all best described by exponential model. The ratios of nugget to sill C0/（ C0 ＋ C） of total P and available K were 10.62% and 9.94% respectively,which indicated that the spatial correlation of soil total P,available K was strong, their spatial variability was mainly Caused by structural factors. The ratio of nugget to sill C0/（ C0 ＋ C） of pH -value was 44.25% ,which indicated that the spatial correlation of pH was moderate, its spatial variability was caused by random factors and structural factors. And the spatial distributions of pH,total P and available K in Shenyang city were analyzed by Kriging interpolation method.

关 键 词：地统计学 城市土壤 PH 土壤养分 空间变异 

分 类 号：S158[农业科学—土壤学]