扎赉诺尔露天煤矿排土场复垦与土壤微生物反馈响应

DUMP RECLAMATION IN JALAI NUR OPEN-PIT COAL MINE AND FEEDBACK RESPONSE OF SOIL MICROBIOME

以扎赉诺尔露天煤矿排土场边坡与平台区域的复垦土壤为研究对象,通过对土壤理化性质测定、土壤菌群结构分析,以及与环境因子相关性分析,将其与未复垦的土壤进行比较,探究排土场复垦与土壤微生物的反馈响应。研究发现:复垦土壤的理化性质差异主要与试验区域土壤深度有关,深度为0~10 cm的土壤相比10~20 cm的土壤理化性质变化更大,其中土壤容重、机械组成和pH对复垦土壤的影响作用明显高于土壤有机碳、土壤总氮和碳氮比,对照组土壤的pH为8.87和8.76,远高于复垦土壤的pH。排土场复垦前后土壤菌群结构差异大,复垦有助于改善土壤微生物菌群结构,且土壤中有机碳和总氮含量增加对其有促进作用。

The reclaimed soil of the side slope and platform of the dumpsite in Jalai Nur Open-pit Coal Mine was selected as the research object.The soil’s physical and chemical properties were determined,the soil microbial communities were analyzed,the correlation between soil microbial diversities and environmental factors was analyzed and compared with the nonreclaimed soil,and the feedback response of dumping site reclamation and soil microorganisms were also explored.The experimental results indicated that differences in physical and chemical properties of the reclaimed soil were mainly related to the soil depth.Compared with the soil of 10~20 cm,the physicochemical properties of 0~10 cm soil changed more greatly.Effects of soil bulk density,mechanical composition,and pH on the reclaimed soil were significantly higher than that of soil organic carbon,soil total nitrogen,and C/N ratio.The pH of the control soil was 8.87 and 8.76,much higher than the pH of the reclaimed soil.The microbial communities of the reclaimed soil were significantly different from the non-reclaimed soil.Reclamation was beneficial in improving the soil microbial communities with the soil organic carbon and total nitrogen content increasing.