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| Spatial differentiation characteristics, pollution evaluation, and source analysis of heavy metals in farmland soil in a county in northern Zhejiang Province, China |
| Received:March 21, 2018 |
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| KeyWord:heavy metals;spatial differentiation;cultivated soil;fuzzy comprehensive evaluation method;GIS |
| Author Name | Affiliation | E-mail | | LÜ Yue-feng | Department of Resource Environment and Urban and Rural Planning, Nanjing Agricultural University, Nanjing 210095, China | | | SUN Hua | Department of Resource Environment and Urban and Rural Planning, Nanjing Agricultural University, Nanjing 210095, China | sh@njau.edu.cn |
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| Abstract: |
| The evaluation of heavy metal pollution and spatial pattern characteristics on cultivated land is of great significance for regional farmland protection and agricultural product safety. Five kinds of soil heavy metals, As, Hg, Cr, Cd, and Pb, from 267 soil samples in a grain producing county of northern Zhejiang Province were analyzed. GIS technology, the single factor and Nemero indexes, and an improved fuzzy comprehensive evaluation method were used to analyze the spatial differentiation, pollution assessment, and source analysis of heavy metal pollution in the study area. The results showed that the average contents of As, Hg, Cr, Cd, and Pb were 8.17, 0.211, 67.03, 0.224, and 37.26 mg·kg-1, respectively, which were all in line with the secondary grade standard of national soil environmental quality. The soil heavy metal block ratio of semivariance function fitting results showed that Hg > Pb > Cd > As > Cr, where Pb, Cd, As, and Cr were moderately related. At the same time, Hg showed a weaker spatial correlation, which is greatly influenced by human activities; the soil in this county was pretty clean and only a few samples were polluted. Pollution mainly occurred in the surrounding areas of the county town, and existed in the form of HgCd multiple contamination. This pollution was mainly due to dust settlement caused by long-term coal combustion in local industrial and mining enterprises, as well as the development of the local battery industry. |
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