气候变化领域集成服务门户(CCPortal): Longitudinal occurrence of methylmercury in terrestrial ecosystems of the Tibetan Plateau

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DOI	10.1016/j.envpol.2016.08.093
	Longitudinal occurrence of methylmercury in terrestrial ecosystems of the Tibetan Plateau
	Liu, Yu-Rong; Dong, Ji-Xin; Zhang, Qiang-Gong; Wang, Jun-Tao; Han, Li-Li; Zeng, Jun; He, Ji-Zheng
通讯作者	Liu, YR (通讯作者)
发表日期	2016
ISSN	0269-7491
EISSN	1873-6424
起始页码	1342
结束页码	1349
卷号	218
英文摘要	Methylmercury (MeHg), a neurotoxin, is a global concern because of its potential risk to human and ecological health. Elevated mercury (Hg) concentrations were recently reported in the Tibetan Plateau (TP) due to increasing Hg input from distant regions, yet little is known about MeHg production and distribution in the terrestrial ecosystems of the TP. Here, we report longitudinal occurrence of MeHg and the factors regulating net MeHg production in 23 grassland sites from eastern to western TP. The soil MeHg content varied from 0.002 to 0.058 ng g(-1), with different distribution patterns between the eastern and western TR There was a positive correlation between the MeHg concentration and the longitude after 90 degrees E, which is similar to the distribution patterns of the total mercury (THg), water and organic carbon in this region. Average MeHg concentration in topsoil is generally higher than that in subsoil. Our results show that MeHg concentration in soils of the TP is directly affected by soil water, potential microbial methylators and THg, while indirectly regulated by soil organic carbon through the microbial community and the longitude-dependent precipitation through soil water. Our study suggests that soil water is the most important driver regulating net MeHg production in the grasslands of the TP. These findings have important implications for unraveling the mechanism of net production of MeHg in high-altitude environments. (C) 2016 Elsevier Ltd. All rights reserved.
关键词	DISSOLVED ORGANIC-MATTER MERCURY METHYLATION ATMOSPHERIC MERCURY PADDY SOILS MICROBIAL TRANSFORMATIONS BIOAVAILABILITY DEPOSITION TRANSPORT WETLANDS BACTERIA
英文关键词	Methylmercury; High-altitude; Tibetan Plateau; Microbial community; Soil water
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000385596000145
来源期刊	ENVIRONMENTAL POLLUTION
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258681
推荐引用方式 GB/T 7714	Liu, Yu-Rong,Dong, Ji-Xin,Zhang, Qiang-Gong,et al. Longitudinal occurrence of methylmercury in terrestrial ecosystems of the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2016,218.
APA	Liu, Yu-Rong.,Dong, Ji-Xin.,Zhang, Qiang-Gong.,Wang, Jun-Tao.,Han, Li-Li.,...&He, Ji-Zheng.(2016).Longitudinal occurrence of methylmercury in terrestrial ecosystems of the Tibetan Plateau.ENVIRONMENTAL POLLUTION,218.
MLA	Liu, Yu-Rong,et al."Longitudinal occurrence of methylmercury in terrestrial ecosystems of the Tibetan Plateau".ENVIRONMENTAL POLLUTION 218(2016).