摘要
从新疆焉耆盆地不同耕地类型(辣椒地、小麦地、玉米地、番茄地、向日葵地、甜菜地)采集186个土壤样品,测定其中8种元素(As、cd、cr、cu、Mn、Ni、Pb和zn)的含量,利用污染负荷指数法(PLI)和潜在生态风险指数法(RI),对不同耕地中微量元素的污染和潜在生态风险进行评估。结果表明:(1)焉耆盆地不同耕地中As、Cd、cr、cu、Ni、Pb与zn含量平均值均未超出国家土壤环境质量二级标准;(2)不同耕地中8种元素单项污染指数反映的环境风险各不相同,各耕地类型土壤PLI的平均值均呈现轻度污染;(3)不同耕地类型土壤中As、Cd、cr、cu、Ni、Pb和zn的单项生态风险指数与各耕地类型RI值均属轻微风险水平。从空间分布可以看出,研究区所有农田类型的土壤RI在空间分布上均呈现轻微生态风险态势。辣椒地与小麦地中潜在生态风险指数较大的区域位于博湖县南部的农田,玉米地、番茄地、向日葵地和甜菜地中潜在生态风险指数较大区域主要分布于和硕县东部的农田。
A total of 186 soil samples from different types of farmland(pepper land, wheat land, corn land, tomato land, sunflower land, and sugar beet land) were collected in the Yanqi Basin, Xinjiang, and concentrations of eight trace elements(As, Cd, Cr, Cu, Mn, Ni, Pb and Zn) in the soil samples were determined. The pollution load index(PLI) and the potential ecological risk index(RI) were employed to assess pollution levels and potential ecological risks of trace elements in farmlands. Results showed that:(1) Contents of As, Cd, Cr, Cu, Ni, Pb and Zn in soils of different farmlands were within second grade ranges of the national standard for soil environmental quality.(2) The single pollution index of 8 elements in different farmland soils reflected different environmental risks, the average PLI values of studied farmlands suggested that all farmlands were slightly polluted.(3) The individual potential ecological risk of 8 trace elements and RI values for all farmlands all showed slight ecological risks. The RI values of studied farmlands indicated slight ecological risks and showed a certain spatial distribution, lands of pepper and wheat in the southern Bohu County and lands of corn, tomato, sunflower and sugar beet in the eastern Heshuo County showed higher potential ecological risk.
作者
王维维
麦麦提吐尔逊·艾则孜
艾提业古丽·热西提
艾尼瓦尔·买买提
WANG Weiwei;EZIZ Mamattursun;RIXIT Atiyagul;MOHAMMAD Anwar(College of Geographical Science and Tourism,Xinjiang Normal University,Urumqi 830054,China;Xinjiang Laboratory of Lake Environment and Resources in Arid Zone,Xinjiang Normal University,Urumqi 830054,China;College of Chemistry and Chemical Engineering,Xinjiang University,Urumqi 830046,China)
出处
《地球与环境》
CAS
CSCD
北大核心
2018年第6期571-580,共10页
Earth and Environment
基金
国家自然科学基金项目(41561073)
关键词
不同耕地
微量元素
污染
生态风险
焉耆盆地
arable land type
trace metal
pollution
ecological risk
Yanqi Basin
