The accumulation of heavy metals in agricultural land and the associated potential ecological risks in Shenzhen, China

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• 作者：Jiansheng Wu ; Jing Song ; Weifeng Li…
• 关键词：Soil heavy metals ; Agricultural topsoil ; Potential ecological risk ; Principal component analysis ; Pollution sources ; Shenzhen ; China
• 刊名：Environmental Science and Pollution Research
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：23
• 期：2
• 页码：1428-1440
• 全文大小：1,844 KB
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• 作者单位：Jiansheng Wu (1) (2)
  Jing Song (3)
  Weifeng Li (3)
  Maokun Zheng (4)
  
  1. Key Laboratory of Urban Habitat Environment Science and Technology, School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen, 518055, Guangdong, China
  2. Laboratory of Earth Surface Processes of Ministry of Education, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China
  3. Department of Urban Planning and Design, Faculty of Architecture, The University of Hong Kong, Hong Kong, SAR, China
  4. Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, Shandong, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Industrial Pollution Prevention
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1614-7499

文摘

Accumulation of heavy metals in agricultural land and their ecological risks are key issues in soil security studies. This study investigated the concentrations of six heavy metals—copper (Cu), zinc (Zn), lead (Pb), nickel (Ni), and chromium (Cr) in Shenzhen’s agricultural lands and examined the potential hazards and possible sources of these metals. Eighty-two samples from agricultural topsoil were collected. Potential ecological risk index was used to calculate the potential risk of heavy metals. Principal component analysis (PCA) was applied to explore pollution sources of the metals. Finally, Kriging was used to predict the spatial distribution of the metals’ potential ecological risks. The concentrations of the heavy metals were higher than their background values. Most of them presented little potential ecological risk, except for the heavy metal cadmium (Cd). Four districts (Longgang, Longhua, Pingshan, and Dapeng) exhibited some degree of potential risk, which tended to have more industries and road networks. Three major sources of heavy metals included geochemical processes, industrial pollutants, and traffic pollution. The heavy metal Cd was the main contributor to the pollution in agricultural land during the study period. It also poses the potential hazard for the future. High potential risk is closely related to industrial pollution and transportation. Since the 1980s, the sources of heavy metals have evolved from parent rock weathering, erosion, degradation of organics, and mineralization to human disturbances resulting in chemical changes in the soil. Keywords Soil heavy metals Agricultural topsoil Potential ecological risk Principal component analysis Pollution sources Shenzhen, China