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Significant mercury efflux from a Karst region in Southwest China- results from mass balance studies in two catchments
Jicheng Xia; Jianxu Wang; Leiming Zhang; Xun Wang; Wei Yuan; Christopher W.N. Anderson; Chaoyue Chen; Tao Peng; Xinbin Feng
2021
Source PublicationScience of the Total Environment
Volume769Pages:144892
Abstract

Karst regions have long been recognised as landscapes of ecological vulnerability, however the mass balance and fate of mercury (Hg) in karst regions have not been well documented. This study focused on the largest contiguous karst area in China and investigated Hg mass balance in two catchments, one with high geological Hg (Huilong) and the other representative of regional background Hg (Chenqi). The mass balance of Hg was calculated separately for the two catchments by considering Hg in throughfall, open field precipitation, total suspended particulate matter (TSP), litterfall, fertilizer, crop harvesting, air-surface Hg0 exchange, surface runoff and underground runoff. Results show that litterfall Hg deposition is the largest loading (from atmosphere) of Hg in both catchments, accounting for 61.5% and 38.5% of the total Hg input at Huilong and Chenqi, respectively. Air-surface Hg0 exchange is the largest efflux, accounting for 71.7% and 44.6% of the total Hg output from Huilong and Chenqi, respectively. Because both catchments are subject to farm and forest land use, cultivation plays an important role in shaping Hg fate. Mercury loading through fertilizer was ranked as the second largest input (28.5%) in Chenqi catchment and Hg efflux through crop harvest was ranked as the second largest output pathway in both Huilong (27.0%) and Chenqi (52.9%). The net Hg fluxes from the catchments are estimated to be 1498 ± 1504 μg m−2 yr−1 and 4.8 ± 98.2 μg m−2 yr−1. The significantly greater magnitude of net Hg source in Huilong is attributed to higher air-surface Hg0 exchange. The output/input ratio of Hg in this study was much greater than has been reported for other forest or agricultural ecosystems and indicates that the karst region of Southwest China is a significant source of atmospheric Hg. The results of this study should be considered in the development of pollution control policies which seek to conserve fragile karst ecosystems characterised by high geological background of Hg.

KeywordAtmospheric Hg Cycling air-surface Exchange mass Balance karst Catchment
DOI10.1016/j.scitotenv.2020.144892
URL查看原文
Language英语
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Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/11216
Collection环境地球化学国家重点实验室
矿床地球化学国家重点实验室
Corresponding AuthorXinbin Feng
Affiliation1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.CAS Centre for Excellence in Quaternary Science and Global Change, Xi'an 710061, China
3.Air Quality Research Division, Science and Technology Branch, Environment and Climate Change Canada, Toronto M3H5T4, Canada
4.College of Resources and Environment, Southwest University, Chongqing 400715, China
5.Environmental Sciences Group, School of Agriculture and Environment, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand
6.University of Chinese Academy of Sciences, Beijing 100049, China
7.Puding Karst Ecosystem Research Station, Chinese Academy of Sciences, Puding 562100, China
Recommended Citation
GB/T 7714
Jicheng Xia,Jianxu Wang,Leiming Zhang,et al. Significant mercury efflux from a Karst region in Southwest China- results from mass balance studies in two catchments[J]. Science of the Total Environment,2021,769:144892.
APA Jicheng Xia.,Jianxu Wang.,Leiming Zhang.,Xun Wang.,Wei Yuan.,...&Xinbin Feng.(2021).Significant mercury efflux from a Karst region in Southwest China- results from mass balance studies in two catchments.Science of the Total Environment,769,144892.
MLA Jicheng Xia,et al."Significant mercury efflux from a Karst region in Southwest China- results from mass balance studies in two catchments".Science of the Total Environment 769(2021):144892.
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