Journal of Ecology and Rural Environment ›› 2019, Vol. 35 ›› Issue (7): 940-946.doi: 10.19741/j.issn.1673-4831.2018.0621

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Comparison of Soil Physical Properties Between Reclaimed Land and Undamaged Land in Grassland Opencast Mining Area

HUANG Yu-han1, KUANG Xin-yu1, CAO Yin-gui1,2, LUO Gu-bai1, WANG Shu-fei1, YANG Geng1, BAI Zhong-ke1,2   

  1. 1. School of Land Science and Technology, China University of Geosciences, Beijing 100083, China;
    2. Key Laboratory of Land Consolidation and Rehalilitation, Ministry of Natural Resources, Beijing 100035, China
  • Received:2018-10-09 Online:2019-07-25 Published:2019-07-22


Taking the opencast mine of grassland as an example,comparison was made on the physical properties of soil bulk density,soil moisture content,soil gravel content and soil texture in the reclaimed land of south and north dumps and the undamaged land of the Shenhua Beidian Shengli Opencast Mine. The methods of variance analysis and fitting analysis were adopted to analyze the differences in physical properties of reclaimed and undamaged soils and the reasons for the dif-ferences. The results show that:(1) Soil bulk density,soil moisture content and soil gravel content in the 8-year reclaimed north dump and the 4-year reclaimed south dump are higher than those of in the undamaged land,while the soils of the south dump and the undamaged land are sandy loam,and the soil of the north dump is sandy clay loam. The fitting analysis shows that the soil bulk density and soil moisture content were affected by soil gravel content and soil texture. (2) With the extension of the reclamation years,soil bulk density,soil gravel content and sand content of soil texture showed a decreas-ing trend,while soil moisture content,silt content and clay content showed an increasing trend. With the increase of soil depth,soil bulk density,soil moisture content,silt content and clay content showed an increasing trend,while soil gravel content and sand content showed a decreasing trend. (3) In general,the soil physical properties of the 8-year reclaimed north dump are better than those of the 4-year reclaimed south dump,which is closer to the undestroyed land. Soil mois-ture content of the >20-40 cm soil layer was significantly higher than that of the 0-20 cm soil layer,which indicates that coal gangue has good water retention capacity. It is an ideal soil reconstruction model using of topsoil and coal gangue to construct the soil profile for land reclamation in the grassland mining area where the topsoil is scarce.

Key words: land reclamation, soil reconstruction, soil physical property, dump, opencast mining area

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