气候变化领域集成服务门户(CCPortal): Soil-atmosphere exchange flux of total gaseous mercury (TGM) at subtropical and temperate forest catchments

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DOI	10.5194/acp-20-16117-2020
	Soil-atmosphere exchange flux of total gaseous mercury (TGM) at subtropical and temperate forest catchments
	Zhou J.; Wang Z.; Zhang X.; Driscoll C.T.; Lin C.-J.
发表日期	2020
ISSN	1680-7316
起始页码	16117
结束页码	16133
卷号	20 期号:24
英文摘要	Evasion from soil is the largest source of mercury (Hg) to the atmosphere from terrestrial ecosystems. To improve our understanding of controls and in estimates of forest soil-atmosphere fluxes of total gaseous Hg (TGM), measurements were made using dynamic flux chambers (DFCs) over 130 and 96 d for each of five plots at a subtropical forest and a temperate forest, respectively. At the subtropical forest, the highest net soil Hg emissions were observed for an open field (24 ± 33 ng m-2 h-1), followed by two coniferous forest plots (2.8 ± 3.9 and 3.5 ± 4.2 ng m-2 h-1), a broad-leaved forest plot (0.18 ± 4.3 ng m-2 h-1) and the remaining wetland site showing net deposition (-0.80 ± 5.1 ng m-2 h-1). At the temperate forest, the highest fluxes and net soil Hg emissions were observed for a wetland (3.81 ± 0.52 ng m-2 h-1) and an open field (1.82 ± 0.79 ng m-2 h-1), with lesser emission rates in the deciduous broad-leaved forest (0.68 ± 1.01 ng m-2 h-1) and deciduous needle-leaved forest (0.32 ± 0.96 ng m-2 h-1) plots, and net deposition at an evergreen pine forest (-0.04 ± 0.81 ng m-2 h-1). High solar radiation and temperature during summer resulted in the high Hg emissions in the subtropical forest and the open field and evergreen pine forest at the temperate forest. At the temperate deciduous plots, the highest Hg emission occurred in spring during the leaf-off period due to direct solar radiation exposure to soils. Fluxes showed strong positive relationships with solar radiation and soil temperature and negative correlations with ambient air TGM concentration in both the subtropical and temperate forests, with area-weighted compensation points of 6.82 and 3.42 ng m-3, respectively. The values of the compensation points suggest that the atmospheric TGM concentration can play a critical role in limiting TGM emissions from the forest floor. Climate change and land use disturbance may increase the compensation points in both temperate and subtropical forests. Future research should focus on the role of legacy soil Hg in reemissions to the atmosphere as decreases in primary emissions drive decreases in TGM concentrations and disturbances of climate change and land use. © 2020 Royal Society of Chemistry. All rights reserved.
英文关键词	climate change; concentration (composition); flux measurement; forest soil; forested catchment; land use; land-atmosphere interaction; mercury (element)
语种	英语
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/168859
作者单位	State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Department of Civil and Environmental Engineering, Syracuse University, Syracuse, NY 13244, United States; Center for Advances in Water and Air Quality, Lamar University, Beaumont, TX 77710, United States; Department of Environmental, Earth and Atmospheric Sciences, University of Massachusetts Lowell, Lowell, MA 01854, United States
推荐引用方式 GB/T 7714	Zhou J.,Wang Z.,Zhang X.,et al. Soil-atmosphere exchange flux of total gaseous mercury (TGM) at subtropical and temperate forest catchments[J],2020,20(24).
APA	Zhou J.,Wang Z.,Zhang X.,Driscoll C.T.,&Lin C.-J..(2020).Soil-atmosphere exchange flux of total gaseous mercury (TGM) at subtropical and temperate forest catchments.Atmospheric Chemistry and Physics,20(24).
MLA	Zhou J.,et al."Soil-atmosphere exchange flux of total gaseous mercury (TGM) at subtropical and temperate forest catchments".Atmospheric Chemistry and Physics 20.24(2020).