| 汞在酸性紫色水稻土的转化与水稻汞富集特征 |
| 摘要点击 1656 全文点击 614 投稿时间：2017-09-14 修订日期：2017-10-25 |
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| 中文关键词 汞 甲基化 甲基汞 水稻 酸性紫色水稻土 |
| 英文关键词 mercury methylation methylmercury rice plants acidic purple paddy soil |
| 作者 | 单位 | E-mail | | 李雨芩 | 西南大学资源环境学院, 重庆 400715 | laaland@email.swu.edu.cn | | 孙涛 | 西南大学资源环境学院, 重庆 400715 | | | 邓晗 | 西南大学资源环境学院, 重庆 400715 | | | 张成 | 西南大学资源环境学院, 重庆 400715
重庆市三峡库区农业面源污染控制工程技术研究中心, 重庆 400716
重庆市农业资源与环境研究重点实验室, 重庆 400716 | | | 王永敏 | 西南大学资源环境学院, 重庆 400715
重庆市三峡库区农业面源污染控制工程技术研究中心, 重庆 400716
重庆市农业资源与环境研究重点实验室, 重庆 400716 | | | 王定勇 | 西南大学资源环境学院, 重庆 400715
重庆市三峡库区农业面源污染控制工程技术研究中心, 重庆 400716
重庆市农业资源与环境研究重点实验室, 重庆 400716 | dywang@swu.edu.cn |
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| 中文摘要 |
| 采用盆栽模拟试验，对汞（Hg）及甲基汞（MeHg）在酸性紫色水稻土中不同水稻生长期的动态变化进行了研究，并分析对比了总汞（THg）和MeHg在水稻体中的富集特征.结果表明：在水稻生长期间，土壤总汞含量变化较小，MeHg含量随时间增加而增加，土壤MeHg/THg值的变化趋势和土壤中MeHg含量变化一致.完熟期THg在水稻中植株的分布状况为：根 > 籽粒 > 茎 > 叶 > 穗壳，MeHg的分布为：籽粒 > 根 > 茎 > 叶 > 穗壳.水稻植株中MeHg/THg均值为24.03%，大于土壤均值3.05%，说明水稻植株中具有较强的MeHg累积能力.在水稻生长周期内，水稻体内MeHg富集系数均值为8.16，远大于THg富集系数的均值2.31，且籽粒中的MeHg富集系数大于根、茎、叶，说明水稻对MeHg的富集能力强于THg，且籽粒更易于富集MeHg.水稻体内的MeHg的转移系数大于THg，且籽粒中MeHg的转移系数大于1，进一步说明MeHg比THg更易在水稻体内转移. |
| 英文摘要 |
| A pot experiment was conducted to analyze the characteristics of mercury (Hg) accumulation during the rice growth period in acidic purple paddy soil. Results showed that the soil total Hg concentration was stable with time during the rice growth period, while methylmercury (MeHg) increased greatly. Therefore, the ratio of MeHg/THg was mainly affected by MeHg concentration. THg concentration in rice plant parts followed the trend:root > grain > stalk > leaf > husk at the mature grain stage, while MeHg concentration followed grain > root > stalk > leaf > husk. The average of MeHg/THg in rice (24.03%) far exceeded that in soil (3.05%), suggesting that rice plants have a strong affinity for MeHg accumulation. This conclusion was supported also by the great difference in average of bio-concentration factors between MeHg (8.16) and THg (2.31) or the transfer factor in the grain, which was more than 1. Moreover, the bio-concentration factor for grain was higher than that for roots, stalks, and leaves, suggesting MeHg was prone to accumulation in grain compared with other part of rice plants. |
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