DOI: 10.1029/2018JG004415
Scopus记录号: 2-s2.0-85052794377
论文题名: Deposition and Fate of Mercury in Litterfall, Litter, and Soil in Coniferous and Broad-Leaved Forests
作者: Zhou J. ; Wang Z. ; Zhang X.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 8 起始页码: 2590
结束页码: 2603
语种: 英语
英文关键词: biogeochemistry
; flux
; litter decomposition
; mercury species and fractions
; methylmercury
英文摘要: Mercury dynamics in the process of litter decomposition is crucial to understanding the atmospheric mercury deposition to soils in the forest catchments. This work aimed to quantify mercury internal biogeochemical cycling and the fractionation process in a coniferous forest and a broad-leaved forest in southwest China. Annual deposition fluxes of total mercury (THg) and methylmercury (MeHg) via litterfall were 40.5 and 0.10 μg/m2 in the coniferous forest and were 90.9 and 0.34 μg/m2 in the broad-leaved forest, respectively. The litterfall biomass was the most influential factor resulting in the higher mercury input in the broad-leaved forest. During the one-year incubation, THg and MeHg mass in the decomposing litter increased 49 and 444% in the coniferous forest compared to those in the broad-leaved forest, respectively. Methylation has increased the risk of MeHg mobilization to aquatic and soil ecosystems during litter decomposition. Additionally, higher mercury deposition flux but lower accumulation in the broad-leaved forest resulted in similar mercury content in the coniferous forest soils. Six mercury fractions were determined by sequential extraction for the decomposing litter, while MeHg concentrations were statistically significantly correlated to water soluble and salt soluble fractions. The residual mercury fraction accounted for over 90% of the THg and increased with litter decomposition. During the last half of the litter decomposition, the ratio of residual fraction significantly increased, while the sum of the other ratios reduced, which indicated that litter dynamics in the internal forests stabilized the mercury in organic soils during litter decomposition. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113384
Appears in Collections: 气候减缓与适应
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作者单位: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China; Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Zhou J.,Wang Z.,Zhang X.. Deposition and Fate of Mercury in Litterfall, Litter, and Soil in Coniferous and Broad-Leaved Forests[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(8)