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Nonstomatal Versus Stomatal Uptake Of Atmospheric Mercury

机译:非气孔对大气汞的气孔吸收

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摘要

Atmospheric constituents may be deposited to and incorporated into plant leaves, with gases entering via stomata, and gas and particles being sorbed at the surface and in some cases traversing the cuticle, possibly reaching the epidermis. Plants are known to be a sink for atmospheric mercury (Hg), and the current paradigm is that uptake of gaseous elemental Hg occurs by way of the stomata. Four plant species, Rudbeckia hirta, Sorghastrum nutans, Andropogon gerardii, and Populus tremuloides, were exposed to air from different sources and with different Hg and CO_2 concentrations in light and dark within a gas exchange chamber at ~25% relative humidity. Data showed that Hg concentration and air source had a significant effect (p < 0.001) on leaf-atmosphere Hg flux, with more deposition to the leaf occurring in elevated-Hg air, and in scrubbed air compared to ambient air. Deposition also occurred during dark and elevated C0_2 exposures, when stomatal conductance was reduced. These observations and the fact that limited or no Hg emission occurred after deposition of atmospheric Hg suggests that the nonstomatal pathway may be an important route of foliar accumulation of atmospheric Hg.
机译:大气成分可能会沉积到植物叶片上并掺入其中,气体会通过气孔进入,气体和颗粒会吸附在表面,在某些情况下会穿过表皮,甚至可能到达表皮。已知植物是大气中汞(Hg)的汇,目前的范例是气态元素Hg的吸收通过气孔发生。在约25%的相对湿度下,在气体交换室内,四种植物物种,即黑心黄金菊,高粱,高粱,金线菊和胡杨,暴露于来自不同来源的空气中,其中的汞和CO_2浓度在明暗之间不同。数据显示,汞浓度和空气源对叶片-大气中的汞通量具有显着影响(p <0.001),与环境空气相比,在升高的汞空气和洗涤空气中,向叶片的沉积更多。当气孔电导率降低时,在黑暗和升高的CO_2暴露中也会发生沉积。这些观察结果以及在大气Hg沉积后发生Hg排放有限或没有的事实表明,非气孔途径可能是大气Hg的叶面积累的重要途径。

著录项

  • 来源
    《Environmental Science & Technology》 |2009年第5期|1367-1372|共6页
  • 作者单位

    Department of Natural Resources and Environmental Science,rnUniversity of Nevada, Reno, Nevada 89557;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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