煤矸石山土壤微生物数量和理化性质的时空变化

Temporal and Spatial Variation of Soil Microbial Populations and Soil Physiochemical Properties in Coal Gangue Mountain

为探明煤矸石山各类群微生物数量的时空变化及其驱动因子,以大同市3座不同排矸年限和空间位置的煤矸石山为研究对象,并以未受排矸影响的文瀛湖公园为对照,对其土壤各类群微生物进行培养分析。结果表明,煤矸石山土壤细菌数量最多,放线菌数量次之,真菌和病原菌数量较少;细菌、真菌、病原菌数量随煤矸石山排矸年限增加而增加,且与土壤有机质、全氮含量呈显著正相关;放线菌数量随排矸年限增加而减少,与土壤速效磷含量呈显著正相关;不同年限煤矸石山间各类群微生物数量的变化大于不同空间位置煤矸石山间的变化,有机质和全氮含量的变化则低于不同空间位置煤矸石山间的变化。

To explore the temporal and spatial variation in microbial populations of coal gangue and analyze the driving factors,we selected three major coal gangue hills under different weathering ages and geographical positions,meanwhile one park which was not affected by coal gangue was selected as control.Then we conducted cultivate experiment to analyze microbial populations.The results showed that bacterial number was the most in coal gangue,actinomycete number was the second,fungi and pathogen numbers were less.With the increase of weathering ages,numbers of bacteria,fungi and pathogen increased,and were linearly related to soil organic matter and nitrogen concentrations,but actinomycete number decreased,and were linearly related to soil olsen phosphorus content.Temporal variation of microbial populations in coal gangue was higher than their spatial variation,but spatial variation was higher in soil organic matter and nitrogen concentration.