欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

不同形态硫对木榄吸收土壤汞的影响

袁俊,张玲,靳明华,丁振华*   

  1. (厦门大学环境与生态学院, 福建厦门 361100)
  • 出版日期:2016-06-10 发布日期:2016-06-10

Effect of different forms of sulfur on Hg content in Bruguiera gymnorrhiza seedlings.

YUAN Jun, ZHANG Ling, JIN Ming-hua, DING Zhen-hua*   

  1. (College of the Environment and Ecology, Xiamen University, Xiamen 361100, Fujian, China).
  • Online:2016-06-10 Published:2016-06-10

摘要: 硫在汞(Hg)的生物地球化学循环中发挥着重要作用。为了解不同价态硫(S、Na2SO4、Na2S)对红树植物吸收Hg的影响,本文以红树植物木榄(Bruguiera gymnorrhiza (L.) Lamk)为研究对象,在受汞污染土壤中添加不同价态(S、Na2SO4、Na2S)和浓度(0、0.1%、1%)的硫,通过土培实验,研究木榄各器官中总Hg和MeHg的富集特征以及硫对植物吸收汞和甲基汞的影响。结果显示:3种不同价态的硫及其化合物能够提高木榄茎对Hg的吸收,但对根和叶吸收Hg的影响比较复杂且无规律性。硫形态对木榄吸收MeHg的影响主要在于根部,施硫能提高根中MeHg的含量。在根部中,硫含量与Hg、MeHg存在极显著性的正相关性(P<0.01),而硫含量与地上部分茎叶中的汞含量相关性并不显著(P>0.05)。

关键词: 化肥使用强度, 氮磷钾比例, 环境安全阈值, 环境风险指数

Abstract: Sulfur (S) plays a key role in Hg biogeochemical cycle. To understand the effect of S in different chemical forms (S, Na2SO4, Na2S) on absorption of Hg in mangrove plants, a pot experiment was conducted with Bruguiera gymnorrhiza (L.) Lamk seedlings treated with different chemical forms of S (S, Na2SO4, Na2S) at different concentrations (0, 0.1% S, 1% S). The potting soil was taken from a farmland with Hg pollution. Sulfur (S0), sodium sulfate (Na2SO4), or sodium sulfide (Na2S) was added in the soil. Contents of total mercury (THg), methylmercury (MeHg) and sulfur in different organs of B. gymnorrhiza were determined. The results showed that Hg absorption in stem increased under stress of the three different sulfur compounds, while the situation in root and leaf was more complicated and irregular. Sulfur’s chemical forms predominantly affected the MeHg content in the root, and sulfuradding enhanced MeHg concentration in root. There was a significant positive correlation among contents of sulfur, Hg, and MeHg in the roots (P<0.01). On the contrary, the correlation between sulfur content and mercury content in aerial parts of stems and leaves was not significant (P>0.05).

Key words: intensity of fertilization, proportion of NPK, environmental safety threshold, environmental risk assessment.