在高海拔的西藏热湖中解开甲基形成
Xia Lu1, Xiaosha Liu1, Zhixia Yang1
1Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Observation and Research Station on Eco-Environment of Frozen Ground in the Qilian Mountains, Lanzhou University, Lanzhou 730000, China.
Journal of hazardous materials
|January 21, 2026
概括
气候变暖导致西藏高原永久湖中的 (Hg) 转化为有毒的甲基 (MeHg). 这些湖泊是MeHg生产的热点,由于永久土的解,造成环境风险.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 微生物学 微生物学
背景情况:
- 气候变暖加速永久土的融化,增加温室气体排放.
- 永久土中含有大量的 (Hg) 储量,容易转化为神经毒性甲基 (MeHg).
- 有限的数据存在于高海拔永久土中MeHg的形成,特别是西藏高原的热湖.
研究的目的:
- 研究西藏高原热岩湖中的MeHg形成和分布.
- 确定控制高山永久土解过程中MeHg产生的因素.
- 在这个敏感的生态系统中评估与MeHg相关的环境风险.
主要方法:
- 对热石岩湖泊和沉积物的实地调查.
- 用微生物抑制剂进行实验室无氧化化.
- 湖水和沉积物的地化学分析.
- 微生物社区测序 (hgcA基因检测).
主要成果:
- 在西藏热湖和沉积物中发现MeHg度升高,尽管总Hg (HgT) 较低.
- 甲生产与土壤有机碳 (SOC) 降解和甲 (CH4) 流量正相关.
- 微生物群落,包括减少硫酸盐的细菌 (SRB),甲基生物和合成物,在Hg(II) 甲基化中发挥关键作用.
- 地质化学因素,如硫酸盐,SOC和含量显著影响MeHg的生产.
结论:
- 西藏热岩湖作为重要的MeHg生产热点,在化高山永久土中起作用.
- 形成MeHg与微生物活动和SOC降解有关.
- 进一步的研究对于了解和减轻温暖的高山地区的MeHg风险至关重要.
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