县域土壤养分空间变异分析——以蒲城县为例  

Analysis on spatial variability of soil nutrients at county level——A case study in Pucheng County

作　　者：秦占飞[1] 常庆瑞[1] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100

出　　处：《干旱地区农业研究》2012年第1期30-35,共6页Agricultural Research in the Arid Areas

基　　金：国家自然科学基金(30872073)

摘　　要：借助GIS和地统计学方法对蒲城县土壤有机质、碱解氮、有效磷和速效钾4种土壤养分的空间变异特征进行了分析。传统统计分析结果表明:4种土壤养分的变异系数在21%～80%之间,均属于中等变异性。地统计学半方差分析结果显示:碱解氮、有效磷和速效钾的基底效应介于25%～75%,具有中等空间相关性;有机质的基底效应为78%,空间相关性较弱。最后采用普通克里格插值方法,输出土壤养分空间分布图,据此分析土壤养分空间分布特征。GIS and geostatistical analysis method was used to analyze the spatial variability of four soil nutrients in- cluding organic matter, available nitrogen, available phosphorus and available potassium in Pucheng County. Traditional statistical analysis showed that variation coefficients of four kinds of soil nutrients ranged from 21% - 80% and were medium in variation intensity. While the result of semi-variance analysis with geostatistics showed that Nugget/Sill of soil available N, P and K ranged from 25 % ~ 75 % and presented moderate spatial dependence ; and Nugget/Sill of soil OM was 78 %, and presented weak spatial dependence. A spatial distribution map of soil nutrients was exported by adopting Ordinary Kriging Model interpolation, and the characteristics of the spatial distribution of soil nutrients were then analyzed.

关 键 词：地统计学 土壤养分 空间变异 

分 类 号：S158.2[农业科学—土壤学]