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  • Enhanced accumulation and storage of mercury on subtropical evergreen forest floor: implications on mercury budget in global forest ecosystems.

    Author(s) : Wang XunLin CheJenLu ZhiYunZhang HuiZhang YiPingFeng XinBin

    Author Affiliation : State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China.

    Author Email : fengxinbin@vip.skleg.cnJerry.Lin@lamar.edu

    Journal article : Journal of Geophysical Research: Biogeosciences 2016 Vol.121 No.8 pp.2096-2109 ref.many

    Abstract : Forest ecosystemsecosystemsSubject Category: Habitats
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    play an important role in the global cyclingcyclingSubject Category: Natural Processes
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    of mercurymercurySubject Category: Chemicals and Chemical Groups
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    (Hg). In this study, we characterized the Hg cycling at a remote evergreen broadleaf (EB) forest site in southwest China (Mount Ailao). The annual Hg input via litterfall is estimated to be 75.0±24.2 µg m-2 yr-1 at Mount Ailao. Such a quantity is up to 1 order of magnitude greater than those observed at remote temperate/boreal (T/B) forest sites. Production of litter biomassbiomassSubject Category: Miscellaneous
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    is found to be the most influential factor causing the high Hg input to the EB forest. Given their large areal coverage, Hg depositiondepositionSubject Category: Miscellaneous
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    through litterfall in EB forests is appropriately 9±5 Mg yr-1 in China and 1086±775 Mg yr-1 globally. The observed wet Hg deposition at Mount Ailao is 4.9±4.5 µg m-2 yr-1, falling in the lower range of those observed at 49T/B forest sites in North America and Europe. Given the data, the Hg deposition flux through litterfall is approximately 15 times higher than the wet Hg deposition at Mount Ailao. Steady Hg accumulation in decomposing litter biomass and Hg uptake from the environment were observed during 25 months of litter decompositiondecompositionSubject Category: Miscellaneous
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    . The size of the Hg pool in the organic horizon of EB forest floors is estimated to be up to 2-10 times the typical pool size in T/B forests. This study highlights the importance of EB forest ecosystems in global Hg cycling, which requires further assessment when more data become available in tropical foreststropical forestsSubject Category: Vegetation Types
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    .

    ISSN : 2169-8953

    DOI : 10.1002/2016JG003446

    Record Number : 20163341859

    Publisher : Wiley-Blackwell

    Location of publication : Hoboken

    Country of publication : USA

    Language of text : English

    Indexing terms for this abstract:

    Descriptor(s) : biomassbiomassSubject Category: Miscellaneous
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    , boreal forestsboreal forestsSubject Category: Vegetation Types
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    , broadleaved evergreen forestsbroadleaved evergreen forestsSubject Category: Vegetation Types
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    , cyclingcyclingSubject Category: Natural Processes
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    , decompositiondecompositionSubject Category: Miscellaneous
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    , depositiondepositionSubject Category: Miscellaneous
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    , ecosystemsecosystemsSubject Category: Habitats
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    , forest litterforest litterSubject Category: Commodities and Products
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    , forest soilsforest soilsSubject Category: Soil Types
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    , forestsforestsSubject Category: Habitats
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    , mercurymercurySubject Category: Chemicals and Chemical Groups
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    , mountain areasmountain areasSubject Category: Habitats
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    , mountain forestsmountain forestsSubject Category: Vegetation Types
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    , organic horizonsorganic horizonsSubject Category: Miscellaneous
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    , soil typessoil typesSubject Category: Soil Types
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    , storagestorageSubject Category: Miscellaneous
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    , subtropicssubtropicsSubject Category: Climate Related
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    , tropical foreststropical forestsSubject Category: Vegetation Types
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    Identifier(s) : duff, nutrient cycling, People's Republic of China, subtropical zones

    Geographical Location(s) : ChinachinaSubject Category: Geographic Entities
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    , YunnanyunnanSubject Category: Geographic Entities
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    Broader term(s) : APEC countriesapec countriesSubject Category: Institutions and Organisations
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    , Developing Countriesdeveloping countriesSubject Category: Miscellaneous
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    , East Asiaeast asiaSubject Category: Geographic Entities
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    , AsiaasiaSubject Category: Geographic Entities
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    , South Western Chinasouth western chinaSubject Category: Geographic Entities
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    , ChinachinaSubject Category: Geographic Entities
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