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| Effects of mining subsidence on soil properties in windy desert area |
| (1.Chinese Research Academy of Environment Sciences，100012，Beijing, China；2.Nanjing Agricultural University，210095，Nanjing, China) |
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Abstract Daliuta mining area as a typical region in southeastern edge of Mu Us sandy land was studied. Based on gray correlation degree model, qualities of soil were analyzed. The study evaluated the variability of soil properties caused by coal mining subsidence in the windy desert area in the northern Shaanxi in recent 20 years. The research showed as follows. 1) Soil moisture deceased in the middle of slope obviously (P＜0.01), and soil porosity increased on top and in middle of slope (P＜0.05). Soil grain size became thicker. Soil organic matter and available N decreased significantly compared with those in non-subsidence areas (P<0.01). The activities of catalase decreased significantly in the subsidence area and could not be repaired within quite a long time (P＜0.01). 2) From the perspective of different depths of soil, coal mining subsidence affected soil qualities mainly in 0-20cm soil depth in the windy desert area, and the effect on soil nutrients was marked for C and N, especially disadvantageous to the conservation and utilization of N in the soil. The subsidence crack, wind and water erosion increased the loss of soil moisture.
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Received: 20 June 2013
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