title: Mercury distribution in the foliage and soil profiles of the Tibetan forest: processes and implications for regional cycling.
abstract: Remote forests are considered a pool of Mercury (Hg) in the global Hg cycle. However, notably few studies have investigated the fate of Hg in the Tibetan forest. In this study, fifty-two foliage samples and seven litter/soil profiles were collected throughout the Tibetan forest. The concentrations of total Hg (THg) in foliage were positively correlated with longitude and negatively correlated with altitude, indicating that the emission of Hg is expected to decrease with increasing distance from emission sources to the Tibetan forest. The deposition flux of THg in the Tibetan forest (with an air-to-forest ground flux of 9.2 μg/m(2)/year) is ∼2 times the flux in clearings, which is suggestive of enhanced Hg deposition by the forest. The depositional Hg is eventually stored in the forest soil, and the soil acts as a net 'sink' for Hg.
authors.affiliation: Key Laboratory of Tibetan Environmental Changes and Land Surface Process, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100101, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Gong
authors.affiliation: Key Laboratory of Tibetan Environmental Changes and Land Surface Process, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100101, China. Electronic address: wangxp@itpcas.ac.cn.
authors.forename: Xiao-ping
authors.initials: XP
authors.lastname: Wang
authors.affiliation: Key Laboratory of Tibetan Environmental Changes and Land Surface Process, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100101, China; University of the Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Yong-gang
authors.initials: YG
authors.lastname: Xue
authors.affiliation: Key Laboratory of Tibetan Environmental Changes and Land Surface Process, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100101, China.
authors.forename: Bai-qing
authors.initials: BQ
authors.lastname: Xu
authors.affiliation: Key Laboratory of Tibetan Environmental Changes and Land Surface Process, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100101, China.
authors.forename: Tan-dong
authors.initials: TD
authors.lastname: Yao
mesh_terms: D000531:Altitude; D055669:Ecological and Environmental Phenomena; D004777:Environment; D008628:Mercury / Q000032:analysis*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D018609:Tibet; D014197:Trees / Q000737:chemistry
chemical_list: D012987:Soil; D012989:Soil Pollutants; D008628:Mercury
keywords: Forest filter effect; High-altitude forest; Longitudinal/altitudinal distribution; Mercury (Hg); Storage