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以黄河三角洲为研究对象,通过土壤样品分层采集进行室内分析获得土壤电导率(1∶5)及采用EM38-MK2在采样点测量水平和垂直模式下土壤表观电导率,应用回归及多元逐步回归模拟分析的方法,研究土壤表观电导率与不同深度土层土壤电导率的相关性,并进行精度验证,以获得基于新型电磁感应仪的不同剖面深度处土壤电导率精确解译模型,实现区域尺度土壤盐分在不同剖面深度处空间分布格局快速评定.研究结果表明:多模式下测定的土壤表观电导率与不同土层土壤电导率呈现不同程度的显著性相关;联合多模式下土壤表观电导率解译土壤电导率的精度高于单一模式;表层土壤电导率协同土壤表观电导率可以提高亚表层及底层土壤电导率的预测精度.本研究可以为快速调查土壤盐渍化及盐渍土改良与利用提供思路,以节约成本和提高效率.
Taking the Yellow River Delta as the research object, soil conductivity (1: 5) was determined by stratified soil sample collection and soil apparent conductivity was measured by EM38-MK2 in horizontal and vertical modes at the sampling point. Regression and multivariate stepwise Regression analysis of the simulation method to study the relationship between soil apparent conductivity and soil conductivity at different depths of soil and verify the accuracy to obtain a new model based on the new electromagnetic conductivity of soil conductivity at different depths accurate interpretation model to achieve The spatial distribution pattern of soil salinity at regional scale was rapidly evaluated at different depths of the profile.The results showed that the apparent conductivity of soil measured under multi-mode was significantly correlated with soil electrical conductivity of different soil layers, The accuracy of soil conductivity measured by conductivity is higher than that of single model.The surface soil conductivity in combination with soil apparent conductivity can improve the prediction accuracy of subsurface and bottom soil conductivity.This study can be used for rapid investigation of soil salinization and salt Soil improvement and utilization provide ideas to save costs and increase efficiency.