The driving factors of mercury storage in the Tibetan grassland soils underlain by permafrost

doi:10.1016/j.envpol.2020.115079

	The driving factors of mercury storage in the Tibetan grassland soils underlain by permafrost
	Gu, Jing ; Pang, Qiaotong ; Ding, Jinzhi 1; Yin, Runsheng 2; Yang, Yuanhe3 ; Zhang, Yanxu
	2020
发表期刊	ENVIRONMENTAL POLLUTION
ISSN	0269-7491
卷号	265
摘要	Soils, especially permafrost in the Arctic and the Tibetan Plateau, are one of the largest reservoirs of mercury (Hg) in the global environment. The Hg concentration in the grassland soils over the Tibetan Plateau and its driving factors have been less studied. This study analyzes soil total mercury (STHg) concentrations and its vertical distribution in grassland soil samples collected from the Tibetan Plateau. We adopt a nested-grid high-resolution GEOS-Chem model to simulate atmospheric Hg deposition. The relationship between STHg and soil organic carbon (SOC), as well as atmospheric deposition, are explored. Our results show that the STHg concentrations in the Tibetan Plateau are 19.8 +/- 12.2 ng/g. The concentrations are higher in the south and lower in the north in the Tibetan Plateau, consistent with the previous results. Our model shows that the average deposition flux of Hg is 3.3 mu g m(-2) yr(-1), with 57% contributed by dry deposition of elemental mercury (Hg-0), followed by dry (19%) and wet (24%) deposition of divalent mercury. We calculate the Hg to carbon ratio (R-Hg:C) as 5.6 +/- 6.5 mu g Hg/g C, and the estimated STHg is 86.6 +/- 101.2 Gg in alpine grasslands in the Tibetan Plateau. We find a positive relationship between STHg and SOC in the Tibetan Plateau (r(2) = 0.36) and a similar positive relationship between STHg and atmospheric total Hg deposition (r(2) = 0.24). A multiple linear regression involving both variables better model the observed STHg (r(2) = 0.42). We conclude that SOC and atmospheric deposition influence STHg simultaneously in this region. The data provides information to quantify the size of the soil Hg pool in the Tibetan Plateau further, which has important implications for the Hg cycles in the permafrost regions as well as on the global scale. (C) 2020 Elsevier Ltd. All rights reserved.
关键词	Soil mercury Grassland Tibetan Plateau Soil organic carbon Atmospheric deposition
学科领域	Environmental Sciences
DOI	10.1016/j.envpol.2020.115079
收录类别	SCI
语种	英语
WOS关键词	SPATIAL-DISTRIBUTION ; ORGANIC-MATTER ; DEPOSITION ; PLATEAU ; TRANSFORMATION ; ACCUMULATION ; SPECIATION ; TRANSPORT ; LAYER
WOS研究方向	Environmental Sciences & Ecology
WOS记录号	WOS:000564561100005
出版者	ELSEVIER SCI LTD
文献子类	Article
出版地	OXFORD
EISSN	1873-6424
资助机构	National Natural Science Foundation of China (NNSFC)National Natural Science Foundation of China (NSFC) [41875148] ; Thousand Youth Talents Plan ; Jiangsu Innovative and Entrepreneurial Talents Plan ; Collaborative Innovation Center of Climate Change, Jiangsu Province
作者邮箱	zhangyx@nju.edu.cn
引用统计	被引频次：12[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/21607
专题	植被与环境变化国家重点实验室
作者单位	1.Nanjing Univ, Sch Atmospher Sci, Nanjing 210023, Peoples R China 2.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol, Beijing 100085, Peoples R China 3.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China 4.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
推荐引用方式 GB/T 7714	Gu, Jing,Pang, Qiaotong,Ding, Jinzhi,et al. The driving factors of mercury storage in the Tibetan grassland soils underlain by permafrost[J]. ENVIRONMENTAL POLLUTION,2020,265.
APA	Gu, Jing,Pang, Qiaotong,Ding, Jinzhi,Yin, Runsheng,Yang, Yuanhe,&Zhang, Yanxu.(2020).The driving factors of mercury storage in the Tibetan grassland soils underlain by permafrost.ENVIRONMENTAL POLLUTION,265.
MLA	Gu, Jing,et al."The driving factors of mercury storage in the Tibetan grassland soils underlain by permafrost".ENVIRONMENTAL POLLUTION 265(2020).

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