Dynamic Characteristics of Soil Water in Different Sites During Ecological Restoration in Mining Area
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    Abstract:

    [Objective] To investigate the hydrodynamics characteristic of soil water in different sites in the mining area in order to provide a scientific basis for ecological restoration in the mining area.[Methods] The soil water characteristic curves, unsaturated hydraulic conductivity, bulk density, porosity, particle size and compactness were measured to investigate characteristics of soil quality, water-holding capacity, readily available water content and water conductivity in different site types.[Results] The capacity of soil water-holding and water-supplying exhibited as:damaged area < restoration for 3 years area < restoration for 5 years area < restoration for 10 years area < restoration for 15 years area < undamaged area, and soil water-holding capacity and water-supplying capacity at 20-40 cm was lower than that at 0-20 cm, which indicated that remediation effect was not obvious. The improvement of soil structure showed as:damage area < remediation area < undamaged area, and the improvement of subsurface soil quality in remediation area was not obvious. The exponential function fitting between suction and unsaturated hydraulic conductivity was good (r2>0.95). Under the same suction, the unsaturated hydraulic conductivity was smaller as:soil bulk density was greater. There was a negative correlation between unsaturated hydraulic conductivity and bulk density, while a positive correlation between unsaturated hydraulic conductivity and total porosity, and this correlation decreases with the increase of suction. Readily available water content of 0-20 cm exhibited as damage area < restoration for 3 years area < restoration for 5 years area < restoration for 10 years area < undamaged < restoration for 15 years area, and readily available water content of 20-40 cm soil layer was smaller than that of 0-20 cm.[Conclusion] The readily available water content was negatively correlated with bulk density and compactness, and positively correlated with total porosity and clay content. The soil quality and water storage capacity had been improved through restoration progress.

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苏帅,杨永刚,黄磊.矿区生态修复过程中不同立地类型土壤水动力学特性[J].水土保持通报英文版,2018,38(1):18-23

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History
  • Received:July 26,2017
  • Revised:September 13,2017
  • Adopted:
  • Online: March 08,2018
  • Published: