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| Source analysis of heavy metal pollution in farmland soil in a mining area based on a small watershed scale |
| Received:November 30, 2022 Revised:February 24, 2023 |
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| KeyWord:small watershed;heavy metals in soil;PMF model;source apportionment;geostatistics |
| Author Name | Affiliation | E-mail | | YANG Yu | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Technology and Research Center for Irrigation Water Resource and Quality Purification of Hunan Province, Changsha 410128, China | | | ZHOU Jiajun | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | GUO Tingting | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | DING Hongwei | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Technology and Research Center for Irrigation Water Resource and Quality Purification of Hunan Province, Changsha 410128, China | | | LIU Xiaoli | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Technology and Research Center for Irrigation Water Resource and Quality Purification of Hunan Province, Changsha 410128, China | 839126754@qq.com |
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| Abstract: |
| Scientific diagnosis and accurate identification of the sources of heavy metals pollution in soil is an important premise of soil environmental prevention and control. To analyze the source and contribution of heavy metals in the cultivated soil in the Qibaoshan mining area in Liuyang on a small agricultural watershed research scale, 60 soil samples of 0-20 cm cultivated layer were collected based on the GIS net layout sampling method, and Cd, As, Fe, Mn, Cu, Zn, and Pb content and the soil pH were determined. The methods of geostatistics, multivariate statistics, and PMF modeling were used to quantitatively analyze the source of typical heavy metals pollution in cultivated soil in the small watershed. The results showed that the mean values of Cd, As, Cu, Zn, and Pb were 10.0, 2.1, 4.5, 2.0 times, and 4.8 times of the background values of soil in Hunan Province, respectively, and exceeded the soil risk screening value for agricultural land (except As). Seven elements were divided into three categories using multivariate statistical analysis, the first category was Fe and Mn, the second As and Pb, and the third Cd, Cu, and Zn. The PMF model showed that all heavy metals were affected by dry and wet sedimentation and historieal sewage irrigation. In addition, Fe and Mn originated mainly from soil parent material sources, Cd, Cu and Zn from mining and smelting activities(especially Cd), and As and Pb pesticides, fertilizers, and transportation. The results showed that human activities, including industrial and agricultural activities and transportation, were the main sources of heavy metal pollution in cultivated soil in the watershed. |
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