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Spatial distribution of heavy metals and pollution evaluation in farmland soil surrounding Huludao Zinc Plant.

TIAN Li1,2, LI Guo-chen1, WANG Yan-hong1*, LI Bo1, NING Cui-ping1,2, CUI Jie-hua1, WANG Shi-cheng1#br#   

  1. (1Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 2 University of Chinese Academy of Science, Beijing 100049, China).
  • Online:2016-11-10 Published:2016-11-10

Abstract: Soil samples from farmlands surrounding Huludao Zinc Plant were collected and the content and spatial distribution of Cr, Cu, Ni, Pb, Zn, Cd, Hg and As were analyzed. Then, the characteristics of heavy metal pollution were evaluated with the methods of single factor pollution index, Nemerow multifactor index and enrichment factor. Finally, the principal component analysis (PCA) was applied to estimate the sources of heavy metals. The results indicated that the farmland soils surrounding the zinc plant showed different degrees of enrichment in heavy me-tals, and Hg and Cd showed higher degrees of pollution than the other metals. The study area was severely polluted as a whole. The distribution of heavy metals pollution in soils was mostly centered on the zinc plant. The PCA analysis showed that Zn, Cd, Cu, As, Pb and Hg in factor 1 were associated with anthropogenic activities such as industrial production and traffic, whereas Ni and Cr in factor 2 were mainly controlled by parent material and its weathering.

Key words: landscape connectivity, distance threshold, the middle reaches of the Heihe River., ecological security, ecological land