基于GIS和Kriging的蓝田县土壤养分空间变异特征研究

A Research on Soil Nutrient Spatial Variability Character based on Kriging——Take Lantian county,Shannxi Province as a case

以陕西省蓝田县北部黄土台塬区为例,采用GPS定位,测定了2007年1024个采样点的土壤有机质、碱解氮、速效磷、速效钾等含量,通过经典统计学方法对研究区的土壤养分变异特征进行了全局描述,利用GIS和Kriging插值方法,在ArcGIS 9.2下的Geostatistical analyst模块研究了这些土壤养分的空间变异特征,绘制出土壤养分空间变异分布图和土壤养分分区管理图,为蓝田县测土配方推荐施肥项目的实施提供了数据基础。

This research is directed against the northern main crops winter wheat of nonirrigated farmland of our country,take Yuan district of Tableland of loess of north of Lantian county of Shaanxi Province as an example,adopt the GPS＇s positioning,measure the soil nutrient value of organic matter（OM）,Alkali-hydrolysable nitrogen（AN）,available potassium（AK）,available phosphorus（AP） of 1024 sampling points in 2007.The author studies the OM,AN,AK,AP the spatial variability in the Geostatistical analyst model of ArcGIS 9.2.and the Kriging method to research the soil nutrient space variation and can create the soil nutrient space variation map and subarea management map which the result is exact.The maps offer a credible data and make the base data of recommendation fertilization.there are some important conclusions educed from this paper.