基于电磁感应(EM38)典型半干旱区土壤盐分空间变异研究  

Spatial Variability of Soil Salinity in Typical Semiarid Area Based on Electromagnetic Induction(EM38)

作　　者：李晓明[1] 杨劲松[1] 李冬顺[1] 

机构地区：[1]中国科学院南京土壤研究所,江苏南京210008

出　　处：《土壤通报》2010年第3期695-699,共5页Chinese Journal of Soil Science

基　　金：国家科技支撑计划项目(2006BAD05B04);中国科学院知识创新工程重要方向性项目(KZCX2-YW-406-3)中国科学院知识创新工程重大项目(KSCZX1-YW-09);国家"863"计划重点大项目(2006AA10A301;2006AA100207)资助

摘　　要：以典型半干旱区———河南封丘为例机械布点研究土壤盐分的空间变异,通过分析磁感式大地电导率测定仪(EM38)测定的表观电导率(ECH和ECV)、样点1∶5土水比浸提液电导率以及土壤全盐之间回归关系,获取研究区域内159个样点各五层的盐分含量。对各层数据进行经典统计分析和地统计分析,调节参数拟合最优的半变异函数,通过Kriging插值法得出研究区内土壤盐分的空间变异分布状况并进行分级,结果表明研究区内主要以轻中度盐化土为主,且主要集中于研究区南部和东南部黄河沿岸地区,且随深度增加盐化土总面积先降后增,与各层土壤盐分含量的变化趋势一致。Spatial variability of soil salinity in typical semiarid area was studied by a case study of Fengqiu County. By analyzing the regression relation between the values measured by EM38 （including horizontal model -ECH and vertical model-ECV） and EC1：5, and the regression relation between EC1：5 and the total salinity content, the salinity content of all layers of all the 159 samples in the study area were obtained. Discriptive statistics and geo-statistics were introduced to the datum, and by adjusting the parameters the best fitted semivariograms were obtained. Finally, by the Kriging interpolation, the spatial variability statuses of soil salinity were achieved and classified into several degrades, which showed the salinized soils were mostly the slightly salinized soils or the moderate salinized soils, and the salinized soils were mainly located in the south and the south-east of the study area which were just the costal areas of the Yellow River. And with the depth increasing, the area of salinized soil reduced firstly and then increased, which was just in accord with the changing tendency of the soil salinity of all layers.

关 键 词：半干旱区 盐分 空间变异 

分 类 号：S156.4[农业科学—土壤学]