EM38在土壤盐渍化快速检测中的应用研究

Application of EM38 in rapid detection of soil salinization

以渭干河-库车河绿洲地区典型样区为研究对象,电磁感应仪EM38检测与田间采样相结合,针对其存在的土壤盐渍障碍问题,分析土壤电导率的剖面分布特征,建立磁感应表现电导率与土壤电导率之间的回归模型,并对运用电磁感应仪EM38划分土壤盐渍剖面类型进行探讨。结果表明:研究区表层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要高于EMh。利用电磁感应仪EM38对研究区进行土壤盐渍剖面类型划分,表聚型与底聚型是研究区最主要的盐渍剖面类型。该结果对研究土壤盐渍化的发生机制、预测与评估该地区土壤盐渍化的发生发展具有重要参考意义。

In this study, we selected the delta oasis of Weigan and Kuqa Rivers as the study area and analyzed the spatial distribution characteristics of soil conductivity by using EM38 measured data and field sampling data. The regression model between the apparent conductivity and soil conductivity was built, and different classification types of saline soil profile by EM38 were taken into consideration. The result showed that a large amount of salty materials were gathered on the surface soil and there was a close correlation between the soil conductivity and apparent conductivity. EMh can detect the surface soil conductivity while EMv can detect the deep soil conductivity in a higher accuracy. The classification result indicated that surface coalescence and bottom coalescence were the main saline soil profile types in this study area. This study has an important significance in further study of mechanism, forecasts and assessment of soil salinization.