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| Spatial distribution characteristics and sources of heavy metals in soil in a pepper growing area of county in Guizhou Province, China |
| Received:June 13, 2020 |
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| KeyWord:pepper;soil heavy metals;positive matrix factorization(PMF);source analysis |
| Author Name | Affiliation | E-mail | | ZENG Qing-qing | College of Agriculture, Guizhou University, Guiyang 550025, China
Engineering Laboratory for Pollution Control and Resource Reuse Technology of Livestock and Poultry Breeding in Mountain, Guiyang 550025, China
Zunyi Academy of Agriculture Sciences, Zunyi 563100, China | | | FU Tian-ling | Engineering Laboratory for Pollution Control and Resource Reuse Technology of Livestock and Poultry Breeding in Mountain, Guiyang 550025, China
The New Rural Development Research Institute, Guizhou University, Guiyang 550025, China | | | ZOU Hong-qin | College of Agriculture, Guizhou University, Guiyang 550025, China | | | TENG Lang | College of Agriculture, Guizhou University, Guiyang 550025, China
Engineering Laboratory for Pollution Control and Resource Reuse Technology of Livestock and Poultry Breeding in Mountain, Guiyang 550025, China | | | WU Kang | Zunyi Academy of Agriculture Sciences, Zunyi 563100, China | | | XIE Ting | Bozhou Bureau of Agriculture and Rural Affairs, Zunyi 563100, China | | | HE Teng-bing | College of Agriculture, Guizhou University, Guiyang 550025, China
Engineering Laboratory for Pollution Control and Resource Reuse Technology of Livestock and Poultry Breeding in Mountain, Guiyang 550025, China
The New Rural Development Research Institute, Guizhou University, Guiyang 550025, China | hetengbing@163.com |
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| Abstract: |
| 108 soil samples in a 4 km×4 km grid was collected to explore the sources of soil heavy metals in a chili pepper plantation in Guizhou Province. Inductively coupled plasma mass spectrometry(ICP-MS)and atomic fluorescence spectroscopy were used to determine the Cd, Hg, As, Pb, Cr, Cu, Zn, and Ni levels in soil, and a positive definite matrix factor analysis(PMF)model was used to analyze their respective pollution sources. The results showed that most of the heavy metals content in the pepper soil was enriched to a certain extent relative to the background values in Guizhou Province. Soil Cd levels exceeded the risk screening value for soil contamination on agricultural land, and the distribution of the eight heavy metals in the study area varied widely. Areas with high Cd, Hg, As, Cr, and Ni content were mainly located in the eastern part of the study area; areas with high Pb content were more scattered, with no significant regions of concentration; and areas with high Cu and Zn content were mainly in the southwest. The PMF model identified the five sources of Cd as industrial, natural, traffic, atmospheric deposition, and mixed sources. Among these, the pollution sources of Cd were more complex, including natural background, agricultural activities, and industrial activities. The pollution sources of Hg and As were complex, including mainly industrial activities. Sources of Pb and Zn pollution were mainly traffic activities and those of Cr, Cu, and Ni were mainly the natural background. Some of the Zn might also originate from traffic activities. There was a risk of Cd, Hg, As, Cu, and Ni contamination in the pepper growing area. The layout of the pepper industry in the future should consider traffic and the impact of industrial and other activities on heavy metals in the soil surface layer to reduce the source of pollution and lower pollutant emissions. In addition, the application of fertilizers and pesticides should be rational to ensure the safe production of peppers. |
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