基于EM38的封丘县土壤盐渍化调查研究

Surveying soil salinization in Fengqiu County based on EM38

针对目前封丘县存在的土壤盐渍化问题,利用EM38磁感应电导仪在田间定位、定点测量,对其土壤盐渍化现状进行调查。运用经典统计学方法,研究了土壤盐分的变异特征。利用Kriging插值方法,绘制了0-30、30-60、60-909、0-120 cm各层土壤盐分空间分布图。结果表明,EM38所测样点的表观电导率测定值EMH（水平位）和EMV（垂直位）的相关系数均达到了90%以上,测定数据准确,其结果均具有较高的可信度。根据统计分析,对于0-30,30-60 cm土层的土壤电导率宜采用EM38水平测量模式（EMH）的表观电导率进行解译,而60-90,90-120 cm土层的土壤电导率宜采用EM38垂直测量模式（EMV）进行解译。从含盐量的平均值来看,各土层变化范围在0.498-0.543 g/kg,各层土壤盐分含量的变异系数分别为0.582、0.249、0.304与0.367,属于中等变异强度。研究区土壤盐渍化评价结果：盐渍化土壤主要集中在东南部,呈现明显的趋势效应,并且在整个剖面,盐分表层最高,随着深度增加呈先减小后增大的趋势。

Taking into account the problem of soil salinization existing in Fengqiu County,soil salinization was surveyed using the EM38（electromagnetic induction）.Spatial variability of soil salinity was measured and analyzed using statistics.Spatia1 distribution maps of soi1 salinity for different soil layers were also mapped.The results indicated that EMH ECa（apparent soil electrical conductivity） and EMV ECa had the highest sample correlation.Soil salinity of 0～30 and 30～60 cm soil layer was interpreted by apparent electrical conductivity of hertical mode,while soil salinity of 60～90 and 90～120 cm soil layer was interpreted by apparent electrical conductivity of vertical mode.The mean of soil salinity was from 0.498 to 0.543.Soil salinity of the study area showed the moderate spatial variability.Spatial variability of soil salinity was better mapped by survey result of EM38 and Kriging interpolation.Soil salinization was mainly located in the southeast of study area and had obvious trend effect.Soil salinity of soil surface was the greatest and had trend of decreased and then increased by depth of soil.