摘要
测定了云南省个旧市50个农产品产地561份耕层土壤样品中As、Cd、Cr、Pb和Zn含量,依据国家土壤二级标准(GB15618-1995)并参照云南省土壤重金属背景值,评价了该区重金属污染程度和生态风险。结果显示,As、Cd、Cr、Pb和Zn均值为129 mg·kg^(-1)、1. 6 mg·kg^(-1)、104 mg·kg^(-1)、212 mg·kg^(-1)和249 mg·kg^(-1),单因子污染指数分别为4. 31、6. 73、0. 44、0. 79和1. 05,综合污染指数为6. 10。个旧市农产品产地土壤已达到重度污染,主要表现为As和Cd复合污染。同时,生态风险评价表明,个旧市As和Cd潜在风险值为70. 2和218. 2,分别达到中度和重度生态污染风险,综合潜在生态风险总值为319. 5,整体表现为重度生态风险。综上所述,个旧市农产品的生产安全应引起相关部门的高度重视。
In accordance with the Environmental Quality Standard for Soils(GB15618-1995)and the background value of heavy metals for soils of Yunnan Province,we analyzed concentrations of As,Cd,Pb and Zn in 561 paddy soil samples from 50 agricultural production areas in Gejiu City of Yunnan Province,and then assessed the pollution and ecological risk of these heavy metals.Results showed that average concentrations of As,Cd,Cr,Pb and Zn were 129,1.6,104,212 and 249 mg·kg^-1,single factor pollution index of As,Cd,Cr,Pb and Zn were 4.31,6.73,0.44,0.79 and 1.05,and comprehensive pollution index of all the heavy metals was 4.06,respectively;which implied the pollution of heavy metals was at severe level in agricultural production areas of Gejiu City,especially with a combined pollution of As and Cd.Moreover,the risk index of As and Cd in these areas were 70.2 and 218.2,with moderate and severe level,respectively;the potential total ecological risk index was 319.5,with a severe level in general.Therefore,the safety of agricultural production areas should attact the attention of the relevant departments in Gejiu City.
作者
曾民
郭蓉
杨树明
张敦宇
王玲仙
殷富有
陈越
程在全
陈玲
ZENG Min;GUO Rong;YANG Shuming;ZHANG Dunyu;WANG Lingxian;YIN Fuyou;CHEN Yue;CHENG Zaiquan;CHEN Ling(Biotechnology and Germplasm Resources Institute,Yunnan Academy of Agricultural Sciences/Yunnan Provincial Key Lab of Agricultural Biotechnology/Key Lab of Southwestern Crop Gene Resources and Germplasm Innovation,Ministry of Agriculture,Kunming 650231,China;Industrial Crop Research Institute,Yunnan Academy of Agricultural Sciences,Kunming 650231,China)
出处
《土壤与作物》
2019年第1期85-92,共8页
Soils and Crops
基金
国家自然科学基金项目(41761070)
农业部指令性项目(2130139)
关键词
农产品产地
重金属污染
环境质量评价
生态风险
agricultural production area
heavy metal pollution
environment quality assessment
ecological risk
