摘要
结合电磁感应仪EM38测量与田间采样,文章分析了黄河三角洲典型区域土壤电导率的剖面分布特征,建立了磁感式表观电导率与土壤电导率间的(多元)回归解译模型,探讨了不同分类方法对土壤盐渍剖面分类结果的准确性,并对典型盐渍剖面类型进行了评价。结果表明:研究区土壤盐分具有较强的表聚性与变异强度;土壤电导率与磁感表观电导率EMh、EMv间呈极显著的相关关系,EMh对浅层土壤电导率的解译精度较高,而EMv对深层土壤电导率的解译精度较高;EMv/EMh法和理论函数法对土壤盐渍剖面的分类结果均具有较高的精度,且理论函数法分类结果的准确性明显优于EMv/EMh法;研究区土壤盐渍剖面可划分为表聚型、底聚型与均匀型,在数量上以表聚型及底聚型为主,其中表聚型与均匀型属于积盐型剖面,底聚型属于脱盐型剖面。该结果对研究黄河三角洲地区土壤盐渍化的发生、机理、预测与评估该地区土壤盐渍化的发生、发展具有重要意义。
By using EM38 measurement and field sampling,this paper analyzed the profile distribution patterns of soil electrical conductivity in typical area of the Yellow River Delta and established（multiple） linear interpretation models between soil electrical conductivity and electromagnetic conductivity,then the classification accuracy of various methods used to classify soil salinity profiles was discussed and the characteristic salinity profile types were further evaluated.Results indicated that soil salinity exhibited top enrichment and strong spatial variation across the study area.Soil electrical conductivity was significantly correlated with electromagnetic conductivity EM_h and EM_v,the interpretation accuracy between EM_h and soil electrical conductivity at upper layers was relatively high,while that between EM_v and soil electrical conductivity at lower layers was relatively high.The classification results of salinity profile types by EM_h/EM_v and theoretical function methods were both of high accuracy,and the classification accuracy of theoretical function method was superior to that of EM_h/EM_v method.Salinity profiles could be classified into inverted,normal and uniform across the study area,and the predominant salinity profile types were inverted and normal.Inverted and uniform could be regarded as salt accumulation types while normal as desalinization type.The research results were of great significance for the mechanism,prediction and evaluation of the occurrence and development of soil salinization in Yellow River Delta.
出处
《中国地质灾害与防治学报》
CSCD
2007年第4期54-59,共6页
The Chinese Journal of Geological Hazard and Control
基金
中国科学院知识创新工程重要方向资助项目(KZCX2-YW-406-3)
国家重点基础研究发展规划项目(2005CB121108)
关键词
电磁感应仪EM38
土壤盐渍剖面
分类与评价
磁感表观电导率
黄河三角洲
electromagnetic induction EM38
soil salinity profiles
classification and evaluation
electromagnetic conductivity
Yellow River Delta
