无为县基本农田土壤重金属分布特征及影响因素分析  

Distribution Characteristics and Influencing Factors of Heavy Metals in Basic Farmland Soil in Wuwei County,Anhui Province

作　　者：伍宏远 刘涛华 Wu Hongyuan;Liu Taohua(Geological Team No.321 of Bureau of Geology and Mineral Exploration of Anhui,Tongling,Anhui 244033,China)

机构地区：[1]安徽省地质矿产勘查局321地质队,安徽铜陵244033

出　　处：《绿色科技》2023年第6期207-212,共6页Journal of Green Science and Technology

摘　　要：以安徽省无为县基本农田保护区为研究对象,对土壤中主要重金属元素分布特征、环境质量等级以及元素含量影响因素进行了分析研究。结果表明:全县环境质量整体较好,95.7%的面积都属于无风险区;各项重金属元素中,Hg和Cd 2种元素富集系数大于1,反映其受人为及其他外界因素影响较大;Cu、Pb、Zn 3种元素富集系数接近1,反映其多受成土环境与地质背景影响;而As、Cr、Ni 3种元素富集系数小于1,反映这3种元素在表层土壤中出现轻微贫化;土壤重金属含量主要受不同地质背景、成土母质以及人类工业活动等因素影响,其中外在途径包括大气沉降、农业化学物质使用、污水灌溉、污泥农用施肥以及工矿企业活动等。Taking Wuwei County basic farmland protection area of Anhui Province as the research object,the distribution characteristics of major heavy metal elements in soil,environmental quality grade and influencing factors of element content were analyzed and studied.The results show that the environmental quality of the whole county is good,and 95.7%of the area belongs to the risk-free area.Among the heavy metal elements,the enrichment coefficients of Hg and Cd are greater than 1,which indicates that they are greatly affected by human and other external factors.The enrichment coefficients of Cu,Pb and Zn are close to 1,indicating that they are mostly affected by soil forming environment and geological setting.The enrichment coefficients of As,Cr and Ni were less than 1,indicating that the three elements were slightly depleted in the surface soil.Soil heavy metal content is mainly affected by different geological background,soil parent material and human industrial activities,among which external ways include atmospheric sedimentation,agricultural chemical use,sewage irrigation,agricultural sludge fertilization and industrial and mining enterprise activities.

关 键 词：基本农田 土壤重金属 地球化学等级 影响因素 污染途径 无为县 

分 类 号：X830.1[环境科学与工程—环境工程]