Influence of Reclamation of Open Pit Dumps on Soil Physical Properties in Semiarid Regions
In order to study the influence of reclamation of open-pit coal mine dump on soil physical properties,the dump platform of Heidaigou open-pit mine in Zhungeer Banner,Ordos City,Inner Mongolia Autonomous Region,was as the research object.The difference of physical properties in 0-60 cm soil layer among natural landform(ZR),unreclaimed dump(WF)and 5-year reclaimed dump(FK)in mining area were analyzed,the effects of reclamation on soil physical properties of dump were studied by variance analysis and principal component analysis.The results showed that the soil bulk density and gravel content of unreclaimed dumps were significantly higher than those of reclaimed dumps and natural landforms,while the soil moisture content,saturated moisture content and field water holding capacity were lower than those of reclaimed dumps and natural landforms,among which the field water holding capacity was significantly different from those of reclaimed dumps and natural landforms.The correlation analysis and regression equation fitting analysis showed that the gravel content in soil affected soil bulk density and water holding capacity.Reclamation made the soil bulk density and gravel content decrease,and the soil moisture content,saturated water content and field water holding capacity increase.With the increase of soil depth,the soil unit weight,moisture content and saturated moisture content of the dump showed an increasing trend,while the field water holding capacity and gravel content showed a decreasing trend.The comprehensive scores of the 40-60 cm soil of 5-year reclaimed dump,40-60 cm soil of natural landformand 20-40 cm soil of 5-year reclaimed dump were ranked as 1st,2nd and 3rd,respectively,which indicated that the reclamation of the dump could improve the soil and optimize the soil texture.The depth of soil improvement by plants could reach 60 cm soil layer in the case of 5 years of reclamation of the dump.Above results provided certain guiding for reclamation work in mining area.
国家科技期刊平台
NSTL
万方数据
维普
