刚果东部盆地土壤中的高储量及其在森林砍伐后的大量动员
Sylvain Bouchet1, Ruben Kretzschmar1, Sebastian Doetterl2
1Soil Chemistry Group, Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science, ETH Zürich, Universitätstrasse 16, CHN, Zürich 8092, Switzerland.
Journal of hazardous materials
|March 6, 2026
概括
非洲热带森林有效地捕获大气中的 (Hg),在土壤中储存大量的. 森林砍伐导致大量的气损失,凸显了这些生态系统在全球循环中的重要性.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 生态生态学 生态生态学
背景情况:
- 热带森林在全球 (Hg) 循环中发挥着至关重要的作用.
- 这些生态系统作为大气Hg的重要吸收器,将其储存在土壤中.
- 关于非洲热带森林,特别是植被和土壤中度的数据很少.
研究的目的:
- 在非洲热带森林的植被和土壤中量化度和流量.
- 调查土地覆盖面和地形对Hg积累的影响.
- 评估这些生态系统在森林砍伐后的Hg损失.
主要方法:
- 从刚果东部盆地的三个地点收集了新鲜叶子,垃圾和土壤概况 (低至1米) 的样本.
- 分析了不同地形位置和土地覆盖面 (森林与耕地) 的Hg度.
- 计算了垃圾流量和相关的土壤Hg含量与森林砍伐后的Hg损失.
主要成果:
- 叶子和垃圾中的Hg度在各个地点都是一致的,与偏远森林相比.
- 垃圾流量证实了热带植被有效地吸收大气中的气.
- 土壤矿物水平显示出高Hg积累,受氧化铁的影响.
- 森林砍伐导致Hg损失显著 (50-65%),与土壤Hg含量线性相关.
结论:
- 非洲热带森林是重要的Hg储库.
- 植物有效地封存大气中的Hg.
- 土壤的Hg积累量很大,与氧化铁有关.
- 土地利用变化,特别是森林砍伐,导致大量的Hg释放,可以通过土壤的Hg储存来预测.
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