Soil physical properties and microbial characteristics in Shuanglonggou abandoned mining area in different restoration years
[Objective]In order to explore the soil physical properties and microbial characteristics in the aban-doned land in Shuanglonggou mining area of Tianzhu Tibetan Autonomous County over different restoration years,the abandoned mining area with different restoration years (2 a,5 a,10 a,and ck) in Shuanglonggou was selected as the research objects.[Method]The temporal and spatial substitution method was used to analyze the characteristics of soil physical properties,including (unit weight,water content and mechanical composition),and soil microbial biomass (microbial biomass carbon,nitrogen,phosphorus,and the number of fungi,bacteria,and actinomycetes) in different remediation years.[Result]The results indicated that the bulk density of topsoil decreased with the exten-sion of remediation years,reaching the minimum (0.921 g/cm³) after 10 years of remediation. Soil moisture content increased with the extension of the remediation period,reaching 2.4 times that of the original land after 10 years of re-mediation. Soil particle size developed towards refinement with the increase in restoration years. The numbers of three types of microorganisms increased with the extension of the restoration period,with bacteria accounting for 96.74％ of the total number of microorganisms,while actinomycetes and fungi only accounted for 0.29％ and 0.003％,respectively,showing obvious surface aggregation.Soil microbial biomass carbon and phosphorus exhibited a trend of gradual increase,exceeding the control sample plots,with the maximum values of 385.562 mg/kg and 24.414 mg/kg,respectively,after remediation for 2 and 5 years.Microbial biomass nitrogen showed a trend of first in-crease and then decrease,with a range of 14.295～132.388 mg/kg.[Conclusion]Through the remediation of aban-doned land in Shuanglonggou mining area has significantly improved the soil quality and accelerated the restoration of the mining area ecosystem to a certain extent.This research provides theoretical and scientific bases for ecological res-toration and improvement of soil quality in the mining area.
万方数据
维普
