In-field Assessment of Soil Salinity and Water Content with Electrical Geophysics

L. A. Pozdnyakova, A. Yu. Trubin, S. Orunbaev, Yu. A. Mansteind, A. B. Umarova
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Abstract

Irrigated agricultural lands in arid and semi-arid areas are particularly vulnerable to climate change and subjected to secondary salinization. Detailed maps of the subsurface are necessary to manage and ameliorate salinity but difficult to obtain, as salinity is dynamic and highly spatially variable. Our group tested several on-ground geophysical instruments and geostatistical approaches for studying soil and groundwater salinity around the world for the last 20 years. Here we present an overview for updated methodologies of electrical geophysical methods (galvanic contact and multi-frequency electromagnetic induction) measuring soil electrical conductivity or resistivity in-situ from the surface down to the depth of 10–20 m to estimate soil salinity, water content, and depth to groundwater table in arid and humid environments both in rural and urban settings.

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利用电地球物理学实地评估土壤盐度和含水量
摘要干旱和半干旱地区的灌溉农田特别容易受到气候变化的影响,并遭受二次盐碱化。要管理和改善盐碱化问题,就必须绘制详细的地下地图,但由于盐碱化是动态的,空间变化很大,因此很难获得。在过去的 20 年里,我们的研究小组在全球范围内测试了几种研究土壤和地下水盐度的地面地球物理仪器和地质统计方法。在此,我们概述了最新的电地球物理方法(电接触和多频电磁感应),这些方法可以测量地表至 10-20 米深处的土壤电导率或电阻率,以估算农村和城市干旱和潮湿环境中的土壤盐度、含水量和地下水位深度。
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