长江流域资源与环境 >> 2020, Vol. 29 >> Issue (8): 1858-1864.doi: 10.11870/cjlyzyyhj202008017

• 生态环境 • 上一篇    下一篇

两种土地利用方式下土壤重金属污染特征与评价

何如海1,薛中俊2,刘娜2,李青松1,胡宏祥2*   

  1. (1. 安徽农业大学经济管理学院,安徽 合肥 230036;2. 安徽农业大学资源与环境学院,安徽 合肥 230036)
  • 出版日期:2020-08-20 发布日期:2020-09-21

Characteristics and Assessment of Heavy Metal Pollution in Soil Under Two Land Use

HE Ru-hai 1,XUE Zhong-jun 2, LIU Na 2, LI Qing-song 1, HU Hong-xiang 2   

  1. (1. School of Economics and Management, Anhui Agricultural University, Hefei 230036, China;
    2. School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China)
  • Online:2020-08-20 Published:2020-09-21

摘要: 为研究安徽铜陵某矿区耕地和人工林地两种土地利用方式下土壤重金属污染特征,应用Tomlinson污染负荷指数法和生物富集系数评价研究区土壤重金属Cd、Cu污染水平和植物重金属富集水平。结果表明:研究区耕地土壤Cd、Cu全量2.34和161.25 mg/kg,均高于林地Cd、Cu全量1.26和80.15 mg/kg,二者均超农用地土壤污染风险筛选值(GB 15618-2018,pH≤5.5)和铜陵市重金属背景值,耕地和林地污染水平分别为中度污染和轻微污染。耕地糙米Cd(0.95 mg/kg)超标严重,黄山栾树地上部Cd、Cu富集系数均低于水稻地上部。综上,黄山栾树人工林地Cd、Cu污染轻于耕地,退耕还林是研究区更佳的土地利用选择。

Abstract: In order to characterize the heavy metal pollution in farmland and woodland (Koelreuteria integrifoliola plantation) around mining area in Tongling City, Anhui Province, the Tomlinson Pollution Load Index and Bio-concentration Factor were applied to evaluate the pollution level of soil heavy metals pollution levels of Cd and Cu, and the enrichment level of plant heavy metals in the research area.The results showed that the total contents of Cd and Cu of farmland in the study area were 2.34 and 161.25 mg/kg respectively, which are higher than 1.26 and 80.15 mg/kg respectively in woodland.Both exceeded risk screening value of agricultural land soil contamination(GB 15618-2018, pH≤5.5) and soil heavy metal background value in Tongling City. The soil pollution level of farmland and woodland were moderate pollution and slight pollution respectively.The content of Cd in brown rice (0.95 mg/kg) seriously exceeded limit for Cd in “National Standard for Food Safety” (GB 2762-2017). The enrichment factors of Cd and Cuin above-ground organs of K. integrifoliola were lower than those of rice. In sum, the pollution of Cd and Cu in the woodland (K. integrifoliola plantation) both are lower than those in farmland,and returning farmland to forest is a better land use option in the study area.

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