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不同长度秸秆还田对土壤汞甲基化与水稻植株甲基汞富集的影响

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张定熙, 孙涛, 王永敏, 李广智, 董玉丹, 唐振亚, 尹德良, 王定勇. 不同长度秸秆还田对土壤汞甲基化与水稻植株甲基汞富集的影响[J]. 环境化学, 2019, (7): 1488-1496. doi: 10.7524/j.issn.0254-6108.2018092501
引用本文: 张定熙, 孙涛, 王永敏, 李广智, 董玉丹, 唐振亚, 尹德良, 王定勇. 不同长度秸秆还田对土壤汞甲基化与水稻植株甲基汞富集的影响[J]. 环境化学, 2019, (7): 1488-1496. doi: 10.7524/j.issn.0254-6108.2018092501
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ZHANG Dingxi, SUN Tao, WANG Yongmin, LI Guangzhi, DONG Yudan, TANG Zhenya, YIN Deliang, WANG Dingyong. Effect of straw returning with different lengths on mercury methylation in paddy soil and methylmercury accumulation in rice plants[J]. Environmental Chemistry, 2019, (7): 1488-1496. doi: 10.7524/j.issn.0254-6108.2018092501
Citation: ZHANG Dingxi, SUN Tao, WANG Yongmin, LI Guangzhi, DONG Yudan, TANG Zhenya, YIN Deliang, WANG Dingyong. Effect of straw returning with different lengths on mercury methylation in paddy soil and methylmercury accumulation in rice plants[J]. Environmental Chemistry, 2019, (7): 1488-1496. doi: 10.7524/j.issn.0254-6108.2018092501
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不同长度秸秆还田对土壤汞甲基化与水稻植株甲基汞富集的影响

  • 1. 西南大学资源环境学院, 重庆, 400715;

  • 2. 重庆市农业资源与环境研究重点实验室, 重庆, 400715

    • 通讯作者: 王永敏, E-mail: wangym540@swu.edu.cn ; 
  • 基金项目:

    国家自然科学基金（41671469，41603103），中央高校基本科研业务费专项基金项目（XDJK2017B035，XDJK2017D202）和西南大学国家级大学生创新创业训练计划项目（201710635061）资助.

Effect of straw returning with different lengths on mercury methylation in paddy soil and methylmercury accumulation in rice plants

  • 1. College of Resources and Environment, Southwest University, Chongqing, 400715, China;

  • 2. Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing, 400715, China

    • Corresponding author: WANG Yongmin, wangym540@swu.edu.cn ; 
  • Fund Project: Supported by the National Natural Science Foundation of China (41671469,41603103), the Fundamental Research Funds for the Central Universities (XDJK2017B035, XDJK2017D202) and the National Undergraduate Training Program for Innovation and Entrepreneurship of Southwest University(201710635061).

  • 摘要: 为降低秸秆还田引起稻田系统甲基汞（MeHg）升高的风险，采用盆栽试验，研究了添加不同长度水稻秸秆（5 cm、2 cm、粉末）条件下，在水稻整个生长期内土壤汞的甲基化以及水稻植株各组织中MeHg的含量变化特征.结果表明，添加秸秆能显著促进稻田土壤汞的甲基化，并能提升稻米MeHg的富集.不同长度秸秆对土壤MeHg净增长的影响时间不同，较长秸秆能长时间内对土壤汞的甲基化产生促进作用，在水稻生长后期土壤MeHg含量持续偏高，致使晚熟期稻米中MeHg质量浓度偏高；粉碎的秸秆在土壤中能快速降解，尽管在短时间内能引起土壤MeHg含量升高，但在水稻生长后期土壤MeHg含量明显下降，完熟期稻米中MeHg含量也远低于其他两种处理方式.因此，秸秆进行粉碎处理后再还田有利于降低稻米的MeHg富集风险.
    Abstract: To explore a reasonable straw returning pattern to alleviate the methylmercury (MeHg) exposure risk in paddy ecosystems, pot experiments were conducted in this study by adding rice straw with three different lengths (5 cm, 2 cm and pulverized rice straw) into paddy soil. The methylation of mercury (Hg) in soil and MeHg distribution in rice plants were investigated during the whole growing period of paddy. The results showed that rice straw returning could promote soil Hg methylation and increase the MeHg levels in rice. The length of straw for returning to field could influence the net MeHg production. The longer straw (5 cm) showed a prolonged promotion for Hg methylation in paddy soil, resulting in higher MeHg concentrations in soil at later growth stage and increased MeHg accumulation in rice. The pulverized rice straw could bring about a MeHg increase in soil in a shorter incubation time, however, MeHg concentrations in soil decreased at later growth stage, which further made a lower rice MeHg compared to other treatments with 5 cm and 2 cm straw. Therefore, it is clear from this study that straw smashing before returning to field could alleviate the methylmercury (MeHg) exposure risk of rice induced by straw returning.
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  • 收稿日期:  2018-09-25

不同长度秸秆还田对土壤汞甲基化与水稻植株甲基汞富集的影响

    通讯作者: 王永敏, E-mail: wangym540@swu.edu.cn ; 
  • 1. 西南大学资源环境学院, 重庆, 400715;
  • 2. 重庆市农业资源与环境研究重点实验室, 重庆, 400715
  • 收稿日期:  2018-09-25
基金项目:

国家自然科学基金（41671469，41603103），中央高校基本科研业务费专项基金项目（XDJK2017B035，XDJK2017D202）和西南大学国家级大学生创新创业训练计划项目（201710635061）资助.

摘要: 为降低秸秆还田引起稻田系统甲基汞（MeHg）升高的风险，采用盆栽试验，研究了添加不同长度水稻秸秆（5 cm、2 cm、粉末）条件下，在水稻整个生长期内土壤汞的甲基化以及水稻植株各组织中MeHg的含量变化特征.结果表明，添加秸秆能显著促进稻田土壤汞的甲基化，并能提升稻米MeHg的富集.不同长度秸秆对土壤MeHg净增长的影响时间不同，较长秸秆能长时间内对土壤汞的甲基化产生促进作用，在水稻生长后期土壤MeHg含量持续偏高，致使晚熟期稻米中MeHg质量浓度偏高；粉碎的秸秆在土壤中能快速降解，尽管在短时间内能引起土壤MeHg含量升高，但在水稻生长后期土壤MeHg含量明显下降，完熟期稻米中MeHg含量也远低于其他两种处理方式.因此，秸秆进行粉碎处理后再还田有利于降低稻米的MeHg富集风险.

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