摘要
以内蒙古河套灌区农田为例,分别运用单元指示克立格和多元指示克立格对河套灌区中游约0.8万hm2农田0~20 cm、20~40 cm深度内的土壤盐分的空间变异性进行了评价,并绘制了基于设定阈值土壤电导率概率分布图。结果表明：各层土壤盐分均不符合正态分布且存在特异值,但采用指示克立格方法可以获得较为稳健的变异函数;受结构性因素影响,各层土壤盐分的指示半方差均表现为强空间自相关性。依据综合概率分布图对土地资源利用的风险性进行了评价,对评价区域土地资源质量的决策管理提供了指导。
An example was given for the farm field of Hetao irrigation area of Inner Mongolia.Univariate indicator Kriging and mutiple-variable indicator Kriging was applied to evaluate spatial variability of soil salinity at depth of 0-20cm and 20-40cm layers,which was performed in the 12 million mu farm field of the middle course of Hetao irrigation area,form the probability distribution map of soil salinity based on setting threshold value.The results indicated that soil salinity didn＇t follow normal distribution because of the existence of outliers,but robust semivariogram could be obtained by using indicator Kriging;Two layers soil salinity exhibited intensive spatial autocorrelation due to compound impact of structural factors.In terms of the combined probability map,the risk of utilizing land resources was further evaluated and the guide for the decision-making and management of the land resources quality at scales was supplied.
出处
《节水灌溉》
北大核心
2010年第5期31-34,共4页
Water Saving Irrigation
基金
国家"十一五"科技支撑计划项目(2007BAD881304)
内蒙古科技攻关与政府专项科研项目(nsn200767)
