Exchange pattern of gaseous elemental mercury in landfill: mercury deposition under vegetation coverage and interactive effects of multiple meteorological conditions
Exchange pattern of gaseous elemental mercury in landfill: mercury deposition under vegetation coverage and interactive effects of multiple meteorological conditions
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DOI：
10.1007/s11356-017-0275-9
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发表时间：
2017-09
影响因子：
5.8
通讯作者：
Zhengkai Tao;Yang Liu;Meng Zhou;Xiaoli Chai
中科院分区：
文献类型：
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作者：
Zhengkai Tao;Yang Liu;Meng Zhou;Xiaoli Chai
垃圾填埋场被认为是大气汞的潜在来源，也是当地或区域大气汞收支的重要组成部分。本研究考察了典型城市生活垃圾填埋场不同条件下气态元素汞的地表空气通量，重点研究了植物覆盖和气象条件的交互作用。结果表明，汞通量表现出以日变化为代表的特征。特别是在kochia sivesiv覆盖条件下观察到汞沉积，而在kchia sivesiv覆盖后发生排放。sieversianawas移除。在狗尾草病毒被发现和去除的条件下，汞是主要的排放模式；然而，平均汞排放通量与这些。病毒发现率比去除后低了近四倍。这些结果验证了植物覆盖是影响垃圾填埋场汞排放的关键因素。在除tk外的所有条件下，Hg通量与太阳辐射和空气/土壤温度呈正相关，与相对湿度呈负相关。sieversianacoverage。这表明气象条件和植被覆盖的交互作用对垃圾填埋场汞排放起着共同的重要作用。这是确定的，k。siversianana能有效抑制汞的排放，因此，它可能适合作为一种基于植物的方法来控制垃圾填埋场的汞污染。
Landfill is known as a potential source of atmospheric Hg and an important component of the local or regional atmospheric Hg budget. This study investigated the gaseous elemental Hg surface–air fluxes under differing conditions at a typical municipal solid waste landfill site, highlighting the interactive effects of plant coverage and meteorological conditions. The results indicated that Hg fluxes exhibited a feature represented by diel variation. In particular, Hg deposition was observed under a condition ofKochia sieversianacoverage, whereas emission that occurred afterK. sieversianawas removed. Hg emission was the dominant mode under conditions ofSetaria viridiscoverage and its removal; however, the average Hg emission flux with theS. viridiscoverage was nearly four times lower than after its removal. These findings verified that the plant coverage should be a key factor influencing the Hg emission from landfills. In addition, Hg fluxes were correlated positively with solar radiation and air/soil temperature and correlated inversely with relative humidity under all conditions, exceptK. sieversianacoverage. This suggested that the interactive effects of meteorological conditions and plant coverage played a jointly significant role in the Hg emission from landfills. It was established thatK. sieversianacan inhibit Hg emission efficiently, and therefore, it could potentially be suitable for use as a plant-based method to control Hg pollution from landfills.