树的戒指 水银受大气气体元素水银和树木生理学控制
Haijun Peng1, Xiangwen Zhang1,2, Kevin Bishop3
1Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå SE-90183, Sweden.
Environmental science & technology
|September 9, 2024
概括
树木环可以追踪大气中的 (Hg),但树木生理学会影响可靠性. 研究人员发现,树环中的Hg趋势因物种而异,最近的增加表明生理控制,而不仅仅是大气中的水平.
科学领域:
- 环境科学 环境科学
- 古气候学 古气候学
- 生物地质化学生物地质化学
背景情况:
- 树环越来越多地被用作大气 (Hg) 度的档案.
- 然而,树环Hg记录的机械控制和可靠性需要进一步调查.
- 了解这些因素对于准确重建过去大气中的水平至关重要.
研究的目的:
- 为了比较一个偏远的北极森林中三种共存的针叶树 (挪威杉,苏格兰松,欧洲) 的树环中的 (Hg) 度.
- 评估树木生理学和大气中的趋势对树环记录的影响.
- 为准确使用树环档案提供建议.
主要方法:
- 收集并分析了挪威杉,苏格兰松和欧洲树的树环样本.
- 树环 (Hg) 数据与来自湖泊沉积物,泥炭和大气监测的历史大气Hg趋势进行了比较.
- 研究了树环中Hg和度之间的关系,以推断运输机制.
主要成果:
- 树环Hg记录显示了特定物种的变化,苏格兰松树可能由于其生理学而表现出更早的峰值.
- 自大约2005年以来,尽管大气Hg下降,但所有物种在外环中都显示出Hg度的增加.
- 活跃树环细胞中Hg和之间的强烈相关性表明共享的运输途径,使Hg的解释复杂化.
结论:
- 树环记录受大气中的沉积和树木生理过程的影响.
- 树环作为大气档案的可靠性取决于物种,并受到最近的生理变化的影响.
- 提供了解释树环数据的建议,强调需要考虑树木生理学的必要性.
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