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| Availability of Heavy Metals and Its Influencing Factors in Tobacco Grown Soils |
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| KeyWord:tobacco-grown soil; heavy metals; availability; influencing factors |
| Author Name | Affiliation | | WANG Chun-xiang | College of Resources & Environment, Southwest University, Key Laboratory of Eco-environments in Three Gorges Reservoir Region（Ministry of Education）, Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400716, China | | XU Chen | Chongqing branch of National Tobacco Corporation, Chongqing 400023, China | | XU An-ding | Chongqing Tobacco Science Institute, Chongqing 400716, China | | CHEN Yu-cheng | College of Resources & Environment, Southwest University, Key Laboratory of Eco-environments in Three Gorges Reservoir Region（Ministry of Education）, Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400716, China | | YANG Zhi-min | College of Resources & Environment, Southwest University, Key Laboratory of Eco-environments in Three Gorges Reservoir Region（Ministry of Education）, Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400716, China | | YANG Chao | Chongqing Tobacco Science Institute, Chongqing 400716, China |
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| Abstract: |
| Research has showed that total contents of heavy metals in soils are not a good indicator of their eco-environmental impacts. Here availability of heavy metals including As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn in 440 tobacco grown soils was investigated and possible sources of heavy metals were also explored. The average available concentrations of heavy metals were 0.92, 0.075, 0.75, 1.62, 0.004, 1.89, 1.14 mg·kg-1, and 1.94 mg·kg-1 for As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn, respectively. The coefficient of variation（CV） of heavy metal contents ranged from 48.97% to 95.64%, with the greatest variation for Hg and Pb（CV was 95.64% and 90.56%, respectively）. These data suggested that available Hg and Pb in soils were largely influenced by human activities, causing extremely uneven distribution. Each of available As, Cd, Ni, Pb, and Zn was highly correlated with most of these 8 elements, implying that they had common sources; while available Cr had very weak correlation with other metals, showing its unique sources. Principal component analysis showed that the availability of heavy metals was strongly influenced by industrial and agricultural sources as well as atmospheric deposition. In addition, soil properties influenced metal availability：soil pH was significantly negatively correlated with available Cd and Pb（P<0.01） and available Cr（P<0.05）; soil organic matter had significantly positive correlation with available Cd and Pb（P<0.01）, and available As, Zn and Ni（P<0.05）, implying that soil organic matter was an important factor influencing the availability of heavy metals. |
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