Revealing the 2D scale-location specific variations of soil properties in the coal mining area of Changhe watershed, China

Authors: Jason Yang*, Ball State University, Hongfen Zhu , Shanxi Agricultural University, Rutian Bi, Shanxi Agricultural University
Topics: Soils, China, Land Use
Keywords: 2D-EMD, BIMF, Land use, SOM, Coal mining area
Session Type: Poster
Presentation File: No File Uploaded

The objective of this study is to apply the 2D multi-scale analyzing method to explore the scale-location dependent variation of soil properties and the scale-location specific relationships between soil properties and influencing factors by coal mining activities. To this end, measurements of soil properties including soil organic matter (SOM), porosity, and silt, were obtained at 1×1 km grid in Changhe watershed, China at three different layers: top layer (0-20 cm), middle layer (20-40 cm), and bottom layer (40-60 cm). Two-dimensional empirical mode decomposition (2D-EMD) was used to extract the spatial patterns of soil properties in the scale-location domain, and the localized scale-specific correlations between SOM and other soil properties and terrain factors were analyzed. It was found that the spatial distributions of SOM trend at middle layer, and soil porosity trend at top and bottom layers could reveal the distinction between coal mining and non-coal mining areas. The correlations between SOM and elevation, slope, and porosity at different scales and depths are apparently affected by the coal mining activities. In addition, the scale-effects on the correlations between SOM and other covariates in different land uses were also examined. The methods proposed in this study is useful to understand the pedogenetic process and SOM influencing factors to other similar regions in the world.

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