区域浅层地下水硝酸盐含量评价的指示克立格法

在进行区域水土资源特性的分析中经常会发现一些特异值，用普通克立格法来求解，通常是不稳健的。为此，本文引入了地统计学方法中的指示克立格法，详细介绍了其基本原理和计算方法。通过对华北冲击平原区曲周县667km2的139个点的浅层地下水井取样分析，发现硝酸盐含量中存在有特异值，应用指示克立格法对其进行了分析，并绘制了硝酸盐含量的分布图及其含量超过最大允许值的概率图。这为区域水土资源利用的风险性评价提供了一种新的方法，同时也为区域水土资源质量的决策管理提供了指导。

Application of indicator Kriging method for assessing nitrate content of regional shallow groundwater

Some outliers usually are found in the process of analyzing the characteristics of soil and water resources. The universal Kriging method is not suitable to such data processing to obtain a steady solution. For this reason, a geostatistical method-indicator Kriging method(a nonparamtric method) is introduced in this paper. Samples collected from 139 observation points of 667Km2 in Quzhou County, North China Plain, are analyzed. Outliers are found in the nitrate content of groundwater. The indicator Kriging method is applied to analyze the data and form the distribution map of nitrate content and the probability map of its content exceeded a maximum allowed value. The proposed method provides a new way for assessing the risk of utilizing soil and water resources in regional scale. It also can be used as the guide for decision making and management of regional soil and water resources.