Tree Rings Mercury Controlled by Atmospheric Gaseous Elemental Mercury and Tree Physiology,Environmental Science & Technology

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Tree Rings Mercury Controlled by Atmospheric Gaseous Elemental Mercury and Tree Physiology
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2024-09-09 , DOI: 10.1021/acs.est.4c05662
Haijun Peng ₁ , Xiangwen Zhang _{1,

2} , Kevin Bishop ₃ , John Marshall ₁ , Mats B Nilsson ₁ , Chuxian Li _{1,

4} , Erik Björn ₅ , Wei Zhu ₁

Affiliation

Tree rings are an emerging atmospheric mercury (Hg) archive. Questions have arisen, though, regarding their mechanistic controls and reliability. Here, we report contrasting tree-ring Hg records in three collocated conifer species: Norway spruce (Picea abies), Scots pine (Pinus sylvestris), and European larch (Larix decidua), which are from a remote boreal forest. Centennial atmospheric Hg trends at the site, derived from varved lake sediments, peats, and atmospheric monitoring, indicated a steady rise from the 1800s, peaking in the 1970s, and then declining. Prior to ca. 2005, larch and spruce tree rings reproduced the peak in the atmospheric Hg trend, while pine tree rings peaked in the 1930s, likely due to the prolonged sapwood period and ambiguity in the heartwood–sapwood boundary of pine. Since ca. 2005, tree rings from all species showed increasing Hg concentrations in the physiologically active outer rings despite declining atmospheric Hg concentrations. The good agreement between Hg and nitrogen concentrations in active tree-ring cells indicates a similar transport mechanism and cautions against their applicability as atmospheric Hg archives. Our results suggest that tree-ring Hg records are controlled by atmospheric Hg and tree physiology. We provide recommendations for using tree-ring Hg archives that take tree physiology into account.

中文翻译：

大气气态元素汞控制的树木年轮汞与树木生理学

年轮是一种新兴的大气汞 (Hg) 档案。然而，关于它们的机械控制和可靠性的问题已经出现。在这里，我们报告了三种并置针叶树物种的树轮汞记录对比：挪威云杉 ( Picea abies )、欧洲赤松 ( Pinus sylvestris ) 和欧洲落叶松 ( Larix decidua )，它们都来自偏远的北方森林。根据湖泊沉积物、泥炭和大气监测得出的该地点百年大气汞趋势表明，汞含量从 1800 年代开始稳步上升，在 1970 年代达到顶峰，然后下降。大约之前。 2005年，落叶松和云杉的年轮重现了大气汞趋势的峰值，而松树的年轮在1930年代达到了峰值，这可能是由于边材周期延长以及松树心边材边界模糊所致。自约。 2005年，尽管大气汞浓度下降，但所有物种的树木年轮都显示出生理活性外环的汞浓度增加。活跃树轮细胞中的汞和氮浓度之间的良好一致性表明了类似的传输机制，并警告不要将它们用作大气汞档案。我们的结果表明，树木年轮汞记录受大气汞和树木生理学控制。我们提供考虑树木生理学的树轮汞档案的使用建议。

更新日期：2024-09-09

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