New Approaches to Understand Mercury in Trees: Radial and Longitudinal Patterns of Mercury in Tree Rings and Genetic Control of Mercury in Maple Sap
New Approaches to Understand Mercury in Trees: Radial and Longitudinal Patterns of Mercury in Tree Rings and Genetic Control of Mercury in Maple Sap
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DOI：
10.1007/s11270-020-04601-2
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发表时间：
2020-05
期刊：
影响因子：
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通讯作者：
R. Yanai;Yang Yang-Yang;Adam D. Wild;Kevin T. Smith;C. Driscoll
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文献类型：
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作者：
R. Yanai;Yang Yang-Yang;Adam D. Wild;Kevin T. Smith;C. Driscoll
近年来，环境中的汞（Hg）受到了广泛的关注，但对树木中Hg的积累却知之甚少。我们分析了新罕布什尔州哈伯德布鲁克实验森林的四种树木年轮中的汞，以确定汞浓度是否更受土壤汞浓度的影响，土壤汞浓度一直稳定或增加，由于历史大气汞沉积的累积保留，或大气汞沉积，近几十年来一直下降。从树干顶部到底部（p< 0.001）和从老树到新树年轮（p= 0.001）的浓度下降表明，叶片吸收汞比根系吸收更重要。10个糖枫树克隆种植在6个街区的海伯格森林在纽约州表现出显着的遗传控制的汁液汞浓度（p= 0.02），这是不相关的土壤汞浓度差异块。无性系在气孔吸收、根系吸收或汞的转运方面可能有所不同。需要更好地了解木材中汞的来源，以预测森林生态系统中汞循环的未来变化。
Mercury (Hg) in the environment has been receiving considerable attention in recent years, but little is known about Hg accumulation in trees. We analyzed Hg in tree rings from four tree species at the Hubbard Brook Experimental Forest in New Hampshire to determine whether Hg concentrations are more influenced by soil Hg concentrations, which have been stable or increasing due to the cumulative retention of historical atmospheric Hg deposition, or by atmospheric Hg deposition, which has declined in recent decades. Declining concentrations from the top to the bottom of the bole (p< 0.001) and from older to newer tree rings (p= 0.001) suggest that foliar uptake of Hg is more important than root uptake. Ten sugar maple clones planted in six blocks at the Heiberg Forest in New York State showed significant genetic control of sap Hg concentration (p= 0.02), which was not related to soil Hg concentration differences across blocks. Clones could differ in stomatal uptake, root uptake, or translocation of Hg. Better understanding of the source of Hg in wood is needed to forecast future changes in Hg cycling in forested ecosystems.