| 朱 鹏,刘 洋,陈良华,高 顺,张 健,杨万勤,李 勇,刘 凯.岷江下游农田生态系统重金属铅镉锌的输入源格局[J].农业环境科学学报,2013,32(9):1814-1820. |
| 岷江下游农田生态系统重金属铅镉锌的输入源格局 |
| 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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| DOI：10.11654/jaes.2013.09.016 |
| 中文关键词: 农田系统 重金属污染 大气沉降 施肥 灌溉 |
| 英文关键词: agricultural system heavy metal pollution air deposition fertilizer irrigation |
| 基金项目: |
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| 摘要点击次数: 2770 |
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| 中文摘要: |
| 岷江下游五通桥区域的土壤存在着中到轻度的铅、镉和锌的污染。为了解该区域农田生态系统这3种重金属的污染源输入格局，对其主要输入源（大气湿沉降、灌溉和施肥）的重金属输入通量开展了定量研究。结果表明，大气湿沉降3种重金属的输入通量在时期间存在着显著差异，雨量充沛的T1和T2期（雨季期）明显地高于T3期（旱季期）；施肥仅有铅和锌的输入通量在时期间存在着显著差异，表现为T3期的输入通量显著地高于T1和T2期；而灌溉的重金属输入通量在时期间没有显著差异。从不同输入源的输入贡献来看，大气湿沉降和施肥在3种金属的输入中均表现为主要的输入源，而灌溉对3种金属的输入贡献则存在着明显的差别，在铅输入中灌溉仅占很小的比例（年输入通量仅为8.0%），在镉输入中其比例提高到了21.9%，而在锌输入中其比例已几乎和其他两种污染源一致。综上可以看出，气候条件和农业生产行为对农田生态系统重金属污染的来源及其贡献有着重要的影响。因此，在农田生态系统重金属污染的管理中应对气候状况和农业生产行为可能引起的重金属污染加以监测，进而促进农产品的清洁安全生产。 |
| 英文摘要: |
| 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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