Soil Salinity Mapping Using Electromagnetic Induction Device (EM38).
2013
Meshkat, Mohammad Ali | Rahimiyan, Mohammad Hassan | Rusta, Mohammad Javad | Dehqani Firuz Abadi, Abu Al-Fazl | Qane, Fatemeh | Soltani, Vali | Taqi Zadeh, Ruh Ol-Lah | Mostafavi, Ali Asghar
Extent of soil salinity in vast areas of the country, dublicates necessity of advanced techniques and tools for monitoring of salinity at different scales (eg. farm, field, catchment and national scales). Electromagnetic induction (EM) is a technique that can be used for mapping of soil salinity in bare or cultivated land condition with no extensive field works and large soil samples. The main objective of this study is to evaluate the ability of EM38 device for soil salinity mapping of 5,000 hectares of Yazd-Ardakan plain soils. For this purpose, soil samples were collected from descrete depths (0-15, 15-30, 30-60 and 60-100 cm) as well as vertical and horizontal readings of EM38 in sampled locations. Electrical conductivities of soil saturated pastes (ECe) were measured in the laboratory and then, relationships between EM38 readings and ECe were investigated. In this research, data of Landsat (TM and ETM+) and TERRA (Aster and MODIS) satellites and ALOS radar were used as auxillary remotely sensed data. The results showed that the EM38 instrument can be recommended as a rapid, accurate and relatively low cost technique for in-situ measurement of soil salinity. It was also found that Aster image (band 1, 2 and 3) is a good source of information for improvement of soil salinity map and also for enhancement of terrain attribites on the final map.
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