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首页> 外文期刊>Environmental Science & Technology >Foliar Mercury Accumulation and Exchange for Three Tree Species
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Foliar Mercury Accumulation and Exchange for Three Tree Species

机译：三种树种叶片汞的积累与交换

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摘要

The goals of this study were to (1)investigate plant mercury (Hg)uptake using different air and soil Hg concentrations near natural background values for three tree species,and (2)test if measured foliar Hg fluxes could explain observed foliar Hg concentrations.Plants were exposed to three soil treatments (<0.01,0.09 +-0.02,and 0.92 +-0.27 mu g Hg g~(-1)),and to three atmospheric exposure concentrations (5.9 +-2.3,14.3 +-2.7,and 30.1 +-3.5 ng Hg m~(-3)).Foliar Hg concentrations were found to be influenced primarily by atmospheric Hg concentrations and to a lesser extent by soil Hg exposures.Data indicated that deciduous species might play a more active role in ecosystem Hg cycling than evergreen trees.Foliar mercury fluxes quantified using a dynamic single-plant gas-exchange chamber for two species were variable and accumulation rates were lower than those predicted based on foliar Hg concentrations.A hypothesis to explain this discrepancy is that the plant gas-exchange chamber measures net flux which includes emission,deposition,adsorption,and re-emission of Hg at the leaf surface,while total foliar accumulation represents only deposition and assimilation.
机译：这项研究的目的是（1）使用三种自然树种的接近自然背景值的空气和土壤汞浓度调查植物汞（Hg）的吸收，以及（2）测试测得的叶汞通量是否可以解释观察到的叶汞浓度。将植物暴露于三种土壤处理（<0.01,0.09 + -0.02和0.92 + -0.27μgHg g〜（-1）），并暴露于三种大气暴露浓度（5.9 + -2.3,14.3 + -2.7，和30.1 + -3.5 ng Hg m〜（-3））。发现叶片Hg浓度主要受大气中Hg浓度的影响，而受土壤Hg暴露的影响较小，数据表明落叶树种可能在生态系统中发挥更积极的作用Hg比常绿乔木循环。使用动态单植物气体交换室对两个物种进行定量的叶汞通量是可变的，并且积累速率低于基于叶汞浓度的预测。假设可以解释这种差异的原因是植物气体交换室措施叶片的净通量，包括汞在叶片表面的排放，沉积，吸附和再排放，而总的叶面积累仅表示沉积和吸收。

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  • 来源
    《Environmental Science & Technology》 |2006年第19期|p.6001-6006|共6页
  • 作者

    ALLISONG.MILLHOLLEN; MAE S.GUSTIN; ANDDANIEL OBRIST;

  • 作者单位

    Department of Natural Resources and Environmental Sciences,University of Nevada-Reno,Reno,Nevada 89557,and Department of Environmental Science,University of Basel,Basel,Switzerland;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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