基于地统计学的河南省封丘县土壤养分空间变异研究  

Geostatistics-based Spatial Variability of Soil Nutrients in Fengqiu County of He′nan Province

作　　者：肖燕[1] 吕喜军[2] 

机构地区：[1]聊城大学环境与规划学院,山东聊城252059 [2]西南交通大学地球科学与环境工程学院,四川成都610031

出　　处：《水土保持通报》2012年第4期180-184,317,共5页Bulletin of Soil and Water Conservation

基　　金：山东自然科学基金项目(ZR2009EL001;ZR2011DQ015)

摘　　要：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。With Fengqiu County of He＇nan Province as the study area, we use ArcGIS 9.2 statistical analysis module（geostatistical analysis） to investigate the spatial variability of soil nutrients. The results show that each of the nutrients in 0--20 cm soil showed a normal distribution and moderate-intensity variation. Specif- ically, soil organic matter had the highest coefficient of variation of 0.665 6, ammonium nitrogen had 0. 411 6, and potassium（K） had 0. 321 3, respectively. Space structural analysis showed that the exponential model fitted best for the distribution of ammonium nitrogen, and the spherical model for K, and the Gaussian model for organic matter. Using ordinary Kriging interpolation, the spatial distribution of organic matter and am- monium nitrogen exhibited banded patterns, while K showed a patchy pattern. The spatial distribution of or- ganic matter was higher along the middle zone along the direction of northeast--southwest, K had higher val- ues in northern central area and lower values in southeast, and ammonium nitrogen was higher in northwest and lower in southeast.

关 键 词：地统计学 空间变异 土壤养分 河南省封丘县 

分 类 号：S158.3[农业科学—土壤学]