Elevated Mercury Deposition, Accumulation, and Migration in a Karst Forest

被引：3

作者：

Du, Hu ^{[1
,2
]}

Wang, Xun ^{[3
]}

Yuan, Wei ^{[3
]}

Wu, Fei ^{[3
]}

Jia, Longyu ^{[3
]}

Liu, Nantao ^{[3
]}

Lin, Che-Jen ^{[4
]}

Gan, Jiang ^{[1
,2
]}

Zeng, Fuping ^{[1
,2
]}

Wang, Kelin ^{[1
,2
]}

Feng, Xinbin ^{[3
]}

机构：

[1] Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Hunan, Peoples R China

[2] Chinese Acad Sci, Inst Subtrop Agr, Huanjiang Observat & Res Stn Karst Ecosyst, Huanjiang 547100, Guangxi, Peoples R China

[3] Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China

[4] Lamar Univ, Ctr Adv Water & Air Qual, Beaumont, TX 77710 USA

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2023年 / 57卷 / 45期

基金：

中国国家自然科学基金;

关键词：

mercury deposition; mercury accumulation; mercurymigration; karst forest; soil; STABLE-ISOTOPE FRACTIONATION; ATMOSPHERIC MERCURY; SUBTROPICAL FOREST; HG ISOTOPES; REDUCTION; EMISSIONS; HG(II); CHINA; PRECIPITATION; TERRESTRIAL;

D O I：

10.1021/acs.est.3c05409

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The karst forest is one of the extremely sensitive and fragile ecosystems in southwest China, where the biogeochemical cycling of mercury (Hg) is largely unknown. In this study, we investigated the litterfall deposition, accumulation, and soil migration of Hg in an evergreen-deciduous broadleaf karst forest using high-resolution sampling and stable isotope techniques. Results show that elevated litterfall Hg concentrations and fluxes in spring are due to the longer lifespan of evergreen tree foliage exposed to atmospheric Hg-0. The hillslope has 1-2 times higher litterfall Hg concentration compared to the low-lying land due to the elevated atmospheric Hg levels induced by topographical and physiological factors. The Hg isotopic model suggests that litterfall Hg depositions account for similar to 80% of the Hg source contribution in surface soil. The spatial trend of litterfall Hg deposition cannot solely explain the trend of Hg accumulation in the surface soil. Indeed, soil erosion enhances Hg accumulation in soil of low-lying land, with soil Hg concentration up to 5-times greater than the concentration on the hillslope. The high level of soil Hg migration in the karst forest poses significant ecological risks to groundwater and downstream aquatic ecosystems.

引用

页码：17490 / 17500

页数：11

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