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植被对甲基度和污染的洪水平原中的负载的影响

Wesley A Heim¹, David Bosworth², Carol DiGiorgio²

¹San Jose State University-Moss Landing Marine Laboratory, 7544 Sandholdt Rd, Moss Landing, CA 95060, USA.

The Science of the total environment

|July 29, 2023

概括

在Yolo Bypass洪水平原中,腐烂的植被是甲基 (MeHg) 的主要来源. 洪水将植物物质转化为甲基化基质,增加水生生态系统中的MeHg水平.

科学领域:

环境化学环境化学
生态毒理学生态毒理学
水文学的水文学

背景情况:

加利福尼亚州的Yolo绕道 (YB) 对于洪水控制至关重要,但由于历史采矿,它也是甲基 (MeHg) 的来源.
泛滥平原的洪水,特别是在大洪水期间,可以调动 (Hg).
了解洪水输送系统中的循环对于下游息地保护至关重要.

研究的目的:

调查牧场和腐烂的植被作为MeHg来源在Yolo绕道泛滥平原中的作用.
为了量化MeHg在洪水期间从植被中产生的MeHg.
填补有关植物对循环的贡献的数据缺口.

主要方法:

进行了复制的洪水中宇宙实验,以模拟洪水平原的条件.
现场采集用于测量洪水前后植被中的MeHg度.
实验室实验评估了植被存在和过器通过水中的MeHg (fMeHg) 之间的相关性.

主要成果:

腐烂的植被,而不是沉积物被确定为fMeHg的主要来源.
植被中的MeHg度在洪水发生17周后显著增加,从2.78 ng g-1 dw上升到45.4 ng g-1 dw.
实验室实验表明,植物数量与水中的fMeHg水平之间存在正相关性.

结论:

在Yolo绕道的分解植被是微生物甲基化无机的重要基质.
在被洪水淹没的环境中,植物在MeHg的产生和释放中发挥着至关重要的作用.
这些发现凸显了考虑植被动态在洪水平原内的循环评估的重要性.

关键词:

土地管理土地管理负载负载负载负载甲基化甲基化甲基化约洛绕行公路 (Yolo bypass) 是一个绕行公路.

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