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水银的命运和运输通过热带雨林的水流

Wei Yuan¹, Xun Wang¹, Che-Jen Lin²

¹State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China.

Environmental science & technology

|March 7, 2024

概括

这项研究使用稳定的同位素来追踪在热带雨林中的移动. 结果显示,植被拦截了大量大气中的,影响了水中的水平和循环.

科学领域:

环境科学环境科学
生物地质化学生物地质化学
热带生态学热带生态学

背景情况:

热带雨林中的 (Hg) 生物地质化学过程的了解很少,这阻碍了全球Hg质量预算评估.
热带雨林在全球循环中发挥着至关重要的作用.
现有的知识缺口需要对这些生态系统中的命运和运输进行详细研究.

研究的目的:

在热带雨林中的水流过程中量化理解的命运和运输.
阐明植被和森林地面在沉积和转化中的作用.
改进热带森林环境中循环的模拟.

主要方法:

应用 (Hg) 稳定同位素追踪技术.
分析Hg度和同位素特征 (Δ¹⁹⁹Hg, Δ²⁰⁰Hg) 在降水,透水和下水中.
使用二进制混合模型和流量/同位素建模.

主要成果:

通过降雨显示Hg度比降雨高1.5-2倍,但由于水的拦截而导致的沉积量相似.
流水显示Hg度明显低于通过下降.
同位素签名揭示了不同的来源和转变:降雨量为正值,通降量接近零,流水量为负值.
二进制混合模型显示大气Hg⁰作为通降 (65 ± 18%) 和流出 (91 ± 6%) 的主要来源.

结论:

植物生物质截获大约三分之二的大气Hg2+输入.
森林地板捕获了剩余的大气Hg2+.
这些发现为热带雨林中的循环动态提供了关键的见解,并为全球预算模型提供了信息.

关键词:

同位素是一种同位素.排水过程中的排水.通过下降通过下降.热带雨林热带雨林热带雨林湿沉积湿沉积是一种湿沉积.

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