Soil organic pollution characteristics and microbial properties in coal mining areas of Mentougou

Soil micro-ecosystem including organic pollution characteristics,basic physicochemical parameters,and microbial properties was analyzed which contaminated with organic pollutants in coal mining area.Results showed that the organic pollution level in coal mining area soils distributed from 0.4 to 1.5 mg /g dry soil,which was 1.5-6 times as much as the background sample.Furthermore,the column chromatography and GC-MS analysis revealed that content of lightly components including saturated and aromatic hydrocarbons exceeded 40%,specifically was alkenes( C15),hydrocarbon derivatives,and a small amount aromatic hydrocarbons.Totally,the components of organic pollutants extracted in soils were similar to which in coal gangue samples,illustrating the source of soil pollution to a certain extent in coal mining areas.The physicochemical factors such as nutrient level and moisture contents were not conducive to the growth and reproduction of microbe except pH level,which might show inhibition to microbial activities.Microbial density of pollutant soils in coal mining areas was totally low,with specific amount 104-105 cell /g dry soil and FDA activity 2.0-2.9 mg /(g.min).Generally,the microbial density and activity were decreased as the enhancing pollution level.However,in-depth analysis was needed urgently because of the complex impact of environmental conditions like pH,moisture,and nutrition.