航空电磁法应用的新领域——盐渍土及次生盐渍化调查

本文提出用航空电磁法、地面电磁法检查和农化样分析相结合的方法进行区域性土壤盐碱化调查.首先,提出用于土壤填图的理论模型,即水平层大地模型,讨论了航空电磁系统在这种模型上的理论电磁响应特征、解释方法.然后,分析了土壤视电阻率与土壤盐碱化指标的关系,最后给出实例,本文的结论是,现有航空电磁系统和解释理论都可直接用于土壤盐渍化填图,并能以较低的费用快速地获得土壤视电阻率图,根据土壤视电阻率与土壤可溶盐总量、阳离子浓度的关系,便可得到土壤盐碱化指标的定量估计。

A NEW APPLICATION OF AIRBORNE ELECTROMAGNETIC METHODSTO SOIL SALINITY MAPPING

This paper shows a new application of airborne electromagnetic (AEM) methods, which have traditionally been used for mineral prospecting. to mapping salinity soil. The nomogram and data interpretation are discussed for a1m thick layer model which is suitable for soil salinization mapping. An example from a survey carried out in East Perenjori, Western Australia with a time-domain AEM system is shown. The commercial AEM systems are capable of soil mapping and the data interpretation techniques used for geological interpretation can be readily adapted for the purposes of airborne salinity mapping. The new airborne salinity mapping method can provide an order-of-magnitude faster survey speed at a reduced cost and thus yield a synoptic knowledge of salinization according to the relationship between soil resistivity and salinity properties of soil. With additional research and development efforts, the airborne electromagnetic method will be able to a powerful tool of salinity mapping.