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| Accurate models of interpreting soil electrical conductivity based on EM38-MK2 |
| Lü Zhenzhen, Yang Jingsong, Liu Guangming |
| State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, Jiangsu 210008, China |
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Abstract Takes the modern Yellow River Delta as the object of study, soil electrical conductivity(1∶5)was measured in laboratory by collecting soil samples stratified and apparent soil electrical conductivity in horizontal and vertical mode measured at the sampling points by EM38-MK2. In order to investigate models to interpret soil conductivity based on electromagnetic induction meter(EM38-MK2), the relationship between soil electrical conductivity at different depths and soil apparent electrical conductivity under different modes respectively was studied using regression and multiple stepwise regressions to assess soil salinity distribution pattern rapidly at different depth in regional scale. The results show that soil apparent electrical conductivity of each mode has a significant correlation with soil electrical conductivity at different soil layers. Interpretation accuracy of soil electrical conductivity is higher in combined soil electrical apparent conductivity of each mode than that single-mode; prediction accuracy of electrical conductivity for subsurface soil and deep soil are increased by combining soil apparent electrical conductivity with surface soil electrical conductivity. The results may provide ideas for rapid measurement and evaluation of soil salinization and saline soil improvement and utilization to save costs and improve efficiency.
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Received: 15 November 2013
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