期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 580, 期 -, 页码 1518-1529出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2016.12.137
关键词
Heavy metal; Geographically weighted regression; Land use; Multivariate statistical analyses; Enrichment factor; Sheyang River
资金
- 973 program of the Ministry of Science and Technology of the People's Republic of China [2014CB953800]
- National Natural Science Foundation of China [41403064, 41273102]
- Natural Science Foundation of Jiangsu Province, China [BK20140922]
- Natural Science Foundation of Jiangsu Higher Education Institutions of China [14KJB610007]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
Multivariate statistical analyses combined with geographically weighted regression (GWR) were used to identify spatial variations of heavy metals in sediments and to examine relationships between metal pollution and land use practices in watersheds, including urban land, agriculture land, forest and water bodies. Seven metals (Cu, Zn, Pb, Cr, Ni, Mn and Fe) of sediments were measured at 31 sampling sites in Sheyang River. Most metals were under a certain degree enrichment based on the enrichment factors. Cluster analysis grouped all sites into four statistically significant cluster, severely contaminated areas were concentrated in areas with intensive human activities. Correlation analysis and PCA indicated Cu, Zn and Pb were derived from anthropogenic activities, while the sources of Cr and Ni were complicated. However, Fe and Mn originated from natural sources. According to results of GWR, there are stronger association between metal pollution with urban land than agricultural land and forest. Moreover, the relationships between land use and metal concentration were affected by the urbanization level of watersheds. Agricultural land had a weak associated with heavy metal pollution and the relationships might be stronger in less-urbanized. This study provided useful information for the assessment and management of heavy metal hazards in studied area. (c) 2016 Elsevier B.V. All rights reserved.
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