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  • Title: Predominant contributions through lichen and fine litter to litterfall mercury deposition in a subalpine forest.
    Author: Huang JH, Berg B, Chen C, Thimonier A, Schmitt M, Osterwalder S, Alewell C, Rinklebe J, Feng X.
    Journal: Environ Res; 2023 Jul 15; 229():116005. PubMed ID: 37116676.
    Abstract:
    Litterfall, typically referring to needles/leaves, may stand for >50% of the total mercury (Hg) deposition in forest ecosystems. By detailed categorisation, we reveal for the first time that the contributions through lichens and fine litter, together 9.98 μg Hg m-2 yr-1, could be as high as that in needle litter (9.96 μg m-2 yr-1) to the annual total Hg deposition (44.6 μg m-2 yr-1) in a subalpine forest in Switzerland. Noticeably, needle litter had the highest contribution (53%) to total Hg in the autumn litterfall but lichens and fine litter together predominated in other seasons (47-59%). Such a seasonal pattern is caused by the high ability of lichens and fine litter to accumulate Hg and the high needle litterfall in autumn, which is related to a good rainfall in summer followed by a dry period in autumn. The constantly higher Hg levels in lichens and fine litter than in needle litter together with similar seasonal patterns of litterfall during 2009-2019 and rainfall during 1980-2019 suggest that our finding can be generally valid. Here, we highlight not only the considerable role of non-needle litterfall in Hg deposition but also the association with weather for seasonal Hg dynamics in different litterfall components.
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