摘要
以新疆奴拉赛铜矿的矿区、尾矿和周边农田土壤为研究对象,研究了该区域土壤理化特性、重金属含量特征,并对其生态环境风险进行了初步评价。结果表明,受矿区废水的长期影响,奴拉赛矿区土壤p H较低。土壤电导率和盐分含量高于周边农田土壤,而土壤有机质、速效氮、速效钾、有效磷含量均低于周边农田土壤;矿区、尾矿区和农田土壤重金属Cr、Cd、Pb、Cu、Ni和Zn含量均较低,除Cu外,均低于新疆土壤自然背景值。总体上看,土壤重金属含量表现为矿区>尾矿区>农田;单一因子(Pi)、内梅罗综合污染指数(I)以及潜在生态危害指数(RI)表明,矿区周边土壤重金属生态风险表现为尾矿>矿区>农田,0~30 cm表层土壤重金属潜在生态风险指数高于30~70 cm深层土壤,但不同土地利用类型土壤总体生态风险程度较低。
Taking the mining areas, tailings and surrounding farmland soil of the Nulasai copper mine in Xinjiang as the research object, the characteristics of soil physical and characteristics of heavy metal contents in this area were studied, and their ecological and environmental risks were preliminarily evaluated. The results showed that due to the long-term impact of mining wastewater, soil pH in the Nulasai mining area was relatively low. Soil conductivity and salt content were higher than those in the surrounding farmland, while soil organic matter, available nitrogen, available potassium and available phosphorus were lower than those in the surrounding farmland. The contents of heavy metals Cr, Cd, Pb, Cu, Ni and Zn in the mining area, tailing area and farmland soil were all lower than those in Xinjiang except for Cu. Overall, the heavy metal content of the soil manifested the area〉 tailing area〉 farmland. Single factor（Pi）, Nemerow comprehensive pollution index（I） and potential ecological risk index（R/） indicated that the ecological risk of heavy metals in the soil around the mining area was manifested tailings〉 mining area〉 farmland. The potential ecological risk index of heavy metals in 0-30 cm topsoil was higher than that in 30-70 cm deep soil, but the overall ecological risk was lower in different land use types,
出处
《农业资源与环境学报》
CAS
北大核心
2018年第1期17-23,共7页
Journal of Agricultural Resources and Environment
基金
中科院战略先导专项(XDA05050504)
关键词
奴拉赛铜矿区
重金属
土地利用方式
风险评价
Nulasai copper mining area
heavy metals
land use type
risk assessment
