气候区决定了森林水文路径沿线的命运
Weibin Ma1, Jen-How Huang1, Gunnar Lischeid2
1State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China.
Journal of hazardous materials
|November 21, 2025
概括
森林树冠过程显著改变 (Hg) 运输,树冠,土壤和气候之间的相互作用导致不同森林类型的Hg循环和生态风险.
科学领域:
- 环境科学 环境科学
- 生物地质化学生物地质化学
- 森林生态 森林生态
背景情况:
- 森林水文学在 (Hg) 循环中发挥着至关重要的作用.
- 了解不同气候区的Hg命运需要检查树冠-土壤-气候相互作用.
研究的目的:
- 为了监测热带,亚热带和高山森林的Hg运输,通过降水,通过降水和下水.
- 为了研究树冠过程,土壤特性和气候如何影响Hg命运和运输途径.
主要方法:
- 长期监测 (3-4年) 的Hg流量在批量降水,通过下降,和下水.
- 在三个不同的森林生态系统中进行比较分析:热带雨林,亚热带常青宽叶和高山针叶树林.
- 量化Hg度和流量以确定运输模式.
主要成果:
- 在所有森林类型中,树冠过程与大量降水相比,持续放大了通过降雨的Hg流.
- 阿尔卑斯山的针叶树林显示了最高的Hg放大 (∼4.9倍),与叶子吸附和冷捕获有关.
- 亚热带森林显示显著的放大 (∼4.2倍) 由于 epiphytic humus,而热带雨林显示最小的增加 (∼1.2倍) 由于快速分解.
- 表面土壤保留了90%以上的透Hg,但流水Hg的组成有很大的不同,阿尔卑斯山流水含低Hg (以溶解Hg为主),亚热带流水含量最小但溶解Hg含量高,热带流水富含颗粒Hg.
结论:
- 树冠-土壤-气候相互作用是森林特有的循环和通过水文路径运输的关键驱动因素.
- 不同的森林生态系统表现出独特的Hg循环模式和相关的生态风险,由于气候变化,树冠特征和土壤特性.
- 森林类型显著影响通过流水运输的的形式和数量,影响下游的污染水平.
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