在降解性石灰岩田中的甲基度:热石灰岩发展和再生植被的影响
Rose-Marie Cardinal1, Pascale Roy-Léveillée1, Sarah Gauthier1
1CRYO-UL: Permafrost Research Laboratory, Department of Geography, Université Laval, Quebec, Quebec, Canada; Centre for Northern Studies, Université Laval, Quebec, Quebec, Canada.
The Science of the total environment
|April 9, 2025
概括
努纳维克的永久土融化释放了,在新形成的融化池中增加了神经毒性甲基 (MeHg). 随着池重新生长,MeHg产量下降,可能稳定在沼泽状的水平.
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:
- 永久土的融化暴露了含有 (Hg) 的有机物质.
- 微生物过程可以将无机 (IHg) 转化为有毒的甲基 (MeHg).
- 解的景观创造了影响甲基化的各种条件,但解特征进化和MeHg生产之间的关系不太清楚.
研究的目的:
- 研究如何降解永久土土 (lithalsas) 的地形和生态演变影响净甲基产量.
- 评估融化池重新植被对甲基化潜力的影响.
- 了解快速变化的北极景观中的循环.
主要方法:
- 在Kangiqsualujjuaq, Nunavik附近收集了175个土壤样本,记录了石灰岩退化和融池重新植被的时间序列.
- 对总 (THg),甲基 (MeHg),百分比碳 (C), (N) 和硫 (S) 的分析样本.
- 评估水文和生态条件,并使用空中照片分析来追踪景观变化.
主要成果:
- 利他尔萨的降解增加了净甲基化潜力,%MeHg从完整的土中的0.57%上升到热的低谷中的4.6%.
- 由于沉浸的有机物和降低的条件,在解池的早期演化阶段发生了最高的%MeHg.
- %MeHg随着植被的继承而下降:Cyperaceae的4.8%,Sphagnum spp.的2.6%.
结论:
- 石灰矿田的地形和生态演变显著影响甲基化.
- 早期的融池阶段表现出最高的净甲基化潜力.
- 随着融池重新生长和陆地化,甲基化潜力下降,可能稳定在与非永久土沼泽相似的水平.
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