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Effects of Precipitation on Mercury Accumulation on Subtropical Montane Forest Floor: Implications on Climate Forcing
Xun Wang; Wei Yuan; Zhiyun Lu; Che‐Jen Lin; Runsheng Yin; Fen Li; Xinbin Feng
2019
Source PublicationJournal of Geophysical Research: Biogeosciences
Volume124Issue:4Pages:959-972
Abstract

Processes facilitated by precipitation play an important role on mercury (Hg) accumulation on forest floor and therefore key to Hg cycling in forest ecosystems. Sites along the windward slope of 1,250 to 2,400 m at Mt. Ailao, Southwestern China, have higher precipitation than the leeward slope sites. In this study, measurements of Hg concentration and associated stable isotope composition for soil, fresh, and degraded litterfall samples were made at sites along two slopes of Mt. Ailao to quantify the direct and indirect effects of precipitation on Hg  accumulation on forest floor. Higher soil Hg concentrations, larger litterfall Hg depositions, and faster litter decomposition rates were observed on the windward slope (1,250–2,400 m).Data of Hg isotopic signatures suggest that Hg in surface soils is mainly derived from litterfall Hg input.Precipitation enhances litterfall Hg deposition by increasing litter biomass production, reduces litter decomposition rate, facilitates shortterm Hg uptake to decomposing litter, and potentially increases microbial activity that increases Hg loss via microbial reduction or runoff. Structural equation modeling results support that the indirect effect of precipitation on increased biomass production merge as the most important factor controlling soil Hg variation. Given the climate forcing on global precipitation pattern and vegetation growth cycle, Hg biogeochemical cycling is likely to continue to evolve under the changing climate.

Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10454
Collection环境地球化学国家重点实验室
Affiliation1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences,Guiyang, China
2.University of Chinese Academy of Sciences, Beijing, China
3.National Forest Ecosystem ResearchStation, Ailaoshan, Yunnan, China
4.Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical BotanicalGarden,, Chinese Academy of Sciences, Mengla, China
5.Department of Civil and Environmental Engineering, LamarUniversity, Beaumont, TX, USA
6.Center for Advances on Water and Air Quality, Lamar University, Beaumont, TX, USA
7.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang,China
Recommended Citation
GB/T 7714
Xun Wang,Wei Yuan,Zhiyun Lu,et al. Effects of Precipitation on Mercury Accumulation on Subtropical Montane Forest Floor: Implications on Climate Forcing[J]. Journal of Geophysical Research: Biogeosciences,2019,124(4):959-972.
APA Xun Wang.,Wei Yuan.,Zhiyun Lu.,Che‐Jen Lin.,Runsheng Yin.,...&Xinbin Feng.(2019).Effects of Precipitation on Mercury Accumulation on Subtropical Montane Forest Floor: Implications on Climate Forcing.Journal of Geophysical Research: Biogeosciences,124(4),959-972.
MLA Xun Wang,et al."Effects of Precipitation on Mercury Accumulation on Subtropical Montane Forest Floor: Implications on Climate Forcing".Journal of Geophysical Research: Biogeosciences 124.4(2019):959-972.
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