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首页> 外文期刊>Environmental Science & Technology >Assessing Air-Surface Exchange and Fate of Mercury in a Subtropical Forest Using a Novel Passive Exchange-Meter Device
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Assessing Air-Surface Exchange and Fate of Mercury in a Subtropical Forest Using a Novel Passive Exchange-Meter Device

机译：使用新型无源交换仪表装置评估亚热带森林中的水面交换和汞的归宿

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摘要

A novel passive exchange meter (EM) device was developed to assess air-surface exchange and leaching of Hg in a forest floor. Flux measurements were carried out in a subtropical forest ecosystem during a full year. Over 40% of the Hg fixed in fresh forest litter was remobilized in less than 60 days in warm and humid conditions as a response to rapid turnover of labile organic matter (OM). A two-block experiment including understory and clearing showed that losses of Hg covaried with seasonal conditions and was significantly affected by forest coverage. The process controlling the bulk loss of total Hg from the litter was volatilization, which typically represented 76-96% of the loss processes (F-loss). The F-loss ranges were 520-1370 and 165-942 ng m(-2) d(-1) in the understory and clearing, respectively. On a yearly basis, deposition of airborne Hg exceeded total losses by a factor of 2.5 in the clearing and 1.5 in the understory. The vegetation litter in this subtropical forest therefore represented a net sink of atmospheric Hg. This study provided a novel approach to Hg air-soil exchange measurements and further insights on the link between Hg remobilization and OM turnover along with its environmental drivers.
机译：开发了一种新颖的被动式交换计（EM）设备，以评估森林地面中的空气表面交换和汞的浸出。全年在亚热带森林生态系统中进行通量测量。在60天内，在温暖和潮湿的环境中，超过40％的固定在新鲜森林凋落物中的汞被迁移，这是对不稳定有机物（OM）快速周转的反应。一项包括林下伐木和伐木的两步试验表明，汞的损失随季节条件而变化，并且受森林覆盖率的影响很大。控制垃圾中总Hg大量损失的过程是挥发，通常占损失过程的76-96％（F损失）。在林下和清除处的F损耗范围分别为520-1370和165-942 ng m（-2）d（-1）。每年，空气中汞的沉积在清除过程中的总损失超过总损失的2.5倍，在地下层中的损失超过1.5倍。因此，该亚热带森林中的植被凋落物代表了大气汞的净汇。这项研究为汞空气-土壤交换的测量提供了一种新颖的方法，并进一步了解了汞迁移与OM转化及其环境驱动因素之间的联系。

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  • 来源
    《Environmental Science & Technology》 |2019年第9期|4869-4879|共11页
  • 作者

    Zhang Hui; Nizzetto Luca; Feng Xinbin; Borga Katrine; Sommar Jonas; Fu Xuewu; Zhang Hua; Zhang Gan; Larssen Thorjorn;

  • 作者单位

    Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, 99 Lincheng West Rd, Guiyang 550081, Guizhou, Peoples R China;

    Norwegian Inst Water Res, NO-0349 Oslo, Norway|Masaryk Univ, Res Ctr Tox Cpds Environm, CS-60177 Brno, Czech Republic;

    Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, 99 Lincheng West Rd, Guiyang 550081, Guizhou, Peoples R China|CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Norwegian Inst Water Res, NO-0349 Oslo, Norway|Univ Oslo, Dept Biosci, NO-0316 Oslo, Norway;

    Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, 99 Lincheng West Rd, Guiyang 550081, Guizhou, Peoples R China;

    Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, 99 Lincheng West Rd, Guiyang 550081, Guizhou, Peoples R China|CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China;

    Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, 99 Lincheng West Rd, Guiyang 550081, Guizhou, Peoples R China|CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China;

    Norwegian Inst Water Res, NO-0349 Oslo, Norway;

  • 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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