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| Input Pattern of Sources for Pb, Cd and Zn in the Agricultural Ecological System in the Lower Reaches（Wutongqiao Section） of Minjiang River |
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| KeyWord:agricultural system; heavy metal pollution; air deposition; fertilizer; irrigation |
| Author Name | Affiliation | | ZHU Peng | Institute of Forestry and Ecology, Faculty of Forestry, Sichuan Agricultural University | | LIU Yang | Institute of Forestry and Ecology, Faculty of Forestry, Sichuan Agricultural University | | CHEN Liang-hua | Institute of Forestry and Ecology, Faculty of Forestry, Sichuan Agricultural University | | GAO Shun | Institute of Forestry and Ecology, Faculty of Forestry, Sichuan Agricultural University | | ZHANG Jian | Institute of Forestry and Ecology, Faculty of Forestry, Sichuan Agricultural University | | YANG Wan-qin | Institute of Forestry and Ecology, Faculty of Forestry, Sichuan Agricultural University | | LI Yong | Institute of Forestry and Ecology, Faculty of Forestry, Sichuan Agricultural University | | LIU Kai | Institute of Forestry and Ecology, Faculty of Forestry, Sichuan Agricultural University |
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| Abstract: |
| Median to low contamination of lead（Pb）, cadmium（Cd） and zinc（Zn） had been found in the agricultural soils of the lower reaches（Wutongqiao section） of Minjiang River. In order to understand the input pattern of these three heavy metals of different sources in this area, we quantitatively researched the input flux of air wet deposition, irrigation and fertilizer, which were supposed to be three main sources in the agricultural ecological system of this area. According to the results, we found that the input fluxes of three metals from air wet deposition all had significant differences among periods, showing that T1（2009/02—2009/06） and T2（2009/07—2009/10）, due to their abundant precipitation（Wet season）, were significantly higher than T3（2009/11—2010/01）（Dry season）. While, the input fluxes from fertilizing among periods were significantly different only for Pb and Zn, being that the input fluxes of T3 were significantly higher than those of T1 and T2. Nonetheless, no significant differences were found in the input fluxes of any metals from irrigation among periods. Regarding the contribution of different sources, air wet deposition and fertilizing exhibited as two main sources for all the three metals, while irrigation contributed differently for three metals, wherein the yearly input flux of Pb from irrigation only had a small proportion（8.0%）, which increased up to 21.9% for Cd and were nearly the same as those of the other two sources for Zn. Conclusively, climate and agricultural production behavior could have important influence on the input pattern of heavy metals of different sources. Therefore, it is of benefit to monitor the possible contamination of heavy metals caused by climate and agricultural production behavior in the agricultural ecological system so as to promote the safe, hygienic production of produce. |
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