Study on spatial variability and profile distribution characteristics of soil salinity by Kriging with an electromagnetic induction
2007
YAO Rong-jiang | YANG Jing-song | JIANG Long
Electromagnetic induction EM38 was applied to study the spatial variability of soil salinity at soil layers of 0-40 cm and 0-80 cm with the help of GIS and geostatistics, which was performed in characteristic field of the Yellow River Delta, and salinization classification and salinity profile distribution characteristics were further analysed. The results showed that soil salinity at both soil layers were precious high and both exhibited moderate spatial variation, and soil salinity overall exhibited the trend of top enrichment in the study area. Exponential model was fitted to the semi-variograms of soil salinity at different soil layers, and both showed the strong spatial autocorrelation. Spatial distribution patterns of soil salinity were mainly controlled by structural factors, such as climate, micro-topography, groundwater and so on. Analysis on salinization classification and salinity profile characteristics indicated that heavy salinized soil was the predominant soil type in the study area, while the distribution area of light salinized soil was the least. The predominant salinity profile type was inverted salinity profiles, followed by uniform and normal salinity profiles, respectively. Furthermore, the distribution of salinity profile types reflected the vegetation types and land use patterns to a certain extent. The research results can serve as a theoretical and practical reference for the precise amelioration and scientific management of saline soils in the Yellow River Delta.
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