基于GPR的滨海盐渍土土壤盐分探测技术研究

摘要

为了探究探地雷达(GPR)对滨海盐渍土水盐运动的响应特征,利用探地雷达测得滨海盐渍土的土壤盐含量.选择水盐含量不同,其余土壤特性类似植被长势不同的地块,设置4种处理方式:分别加入20 L水、20 L浓度为5 g/L的NaCl溶液、20 L浓度为20 g/L的NaCl溶液、对照地块.使用250 MHz的pulse EKKO PRO探地雷达,探测不同地块不同层次不同处理方式下的土壤介电常数与振幅.通过对不同水盐状态下的土壤介电常数与振幅的分析,发现水盐的增加会加大土壤的介电常数,逐层减弱振幅.在1 m深度范围内GPR测得介电常数与振幅信息能够从一定程度上反映土壤盐分变化.%The lands with different soil water and salt contents and vegetation growth but similar other soil properties were selected for the experiment. Four treatments were set including CK, adding 20 L of water, adding 20 L of 5 g /L NaCl solution and adding 20 L of 20 g /L NaCl solution. Based on GPR, the coastal saline soil salinity was detected to study the response characteristics of GPR to water-salt movement. The soil dielectric constant and amplitude were measured with the 250 MHz pulse EKKO PRO GPR in different soil layers of different lands under different treatments. The results showed that the dielectric constant was increased and the amplitude was weaken layer by layer with the increase of water and salt. In the 1 m depth of soil, the dielectric constant and amplitude information measured by GPR could reflect the changes of soil salinity to a certain extend.