Unexpected high methylmercury contents related to soil organic carbon and its molecular composition in wetland soils of the Yarlung Tsangbo River, Tibet
Unexpected high methylmercury contents related to soil organic carbon and its molecular composition in wetland soils of the Yarlung Tsangbo River, Tibet
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西藏雅鲁藏布江湿地土壤中与土壤有机碳及其分子组成相关的意外高甲基汞含量
DOI：
10.1016/j.geoderma.2020.114607
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发表时间：
2020-11
期刊：
影响因子：
6.1
通讯作者：
Jiang Ming
中科院分区：
文献类型：
--
作者：
Zhang Zhongsheng;Li Min;Li Zhe;Xue Zhenshan;Jiang Ming
Deciphering the role of soil organic matter on methylmercury production in wetlands is an important environmental topic in Tibet, where is the province with the largest number of international rivers, including the Yarlung Tsangbo River. In this study, total mercury (THg) and methylmercury (MeHg) contents in soils from wetlands along the YTR were detected, and roles of the molecular composition of soil organic carbon (SOC) in the formation of MeHg were explained in detail by pyrolysis–gas chromatography/mass spectrometry technology (Py-GC/MS). On average, THg and MeHg contents were 62.9 ng/g and 5.88 ng/g, respectively. About 12.6% of total Hg was in the form of MeHg. Unexpected high methylmercury levels occurred in wetland soils along the YTR. The topsoils (0–20 cm) had more THg but less MeHg contents than those in subsoils (20–48 cm). The proportion of MeHg to THg (RHg) was higher in subsoils than in topsoils independent of wetland types. Correlations between THg, MeHg, and SOC were weak in topsoils but strong in subsoils. Lignin and phenol moieties of SOC pyrolysis products were significantly and positively related to THg in topsoils, while positive or negative correlations were found between THg, MeHg, and pyrolysis products of SOC in subsoils atp< 0.05 level. C/N ratios were negatively related to RHg to a significant level in both topsoils and subsoils. Hg/C ratios correlated negatively with C/N ratios in both topsoils and subsoils at the 0.001-level, and larger coefficients in subsoils confirmed that older and high decomposed soil organic matter generally have high levels of Hg. Principle component analysis indicated that THg contents were closely related to plant-derived organic compounds, and MeHg contents were closely related to phytoplankton-derived organic compounds. Our findings suggested that molecular compositions of soil organic matter are critical to MeHg presentence in wetland soils along the YTR.
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气候和植被是全球表层土壤汞储存的主要驱动因素
影响因子：
11.4
作者：
Wang Xun;Yuan Wei;Lin Che-Jen;Zhang Leiming;Zhang Hui;Feng Xinbin
通讯作者：
Feng Xinbin
影响因子：
11.4
作者：
James G. Wiener;Brent C. Knights;M. B. Sandheinrich;J. Jeremiason;M. E. Brigham;Daniel R. Engstrom;L. Woodruff;William F. Cannon;S. Balogh
通讯作者：
James G. Wiener;Brent C. Knights;M. B. Sandheinrich;J. Jeremiason;M. E. Brigham;Daniel R. Engstrom;L. Woodruff;William F. Cannon;S. Balogh
DOI：
10.1007/978-94-009-1780-4
发表时间：
1996
期刊：
--
影响因子：
--
作者：
W. Baeyens;R. Ebinghaus;O. F. Vasilʹev;Fluxes Global Mercury Cycles Sources;Mass Balances
通讯作者：
W. Baeyens;R. Ebinghaus;O. F. Vasilʹev;Fluxes Global Mercury Cycles Sources;Mass Balances
佛罗里达州大沼泽地土地利用变化对土壤有机质化学的影响 - 使用热解-气相色谱-质谱法进行表征
影响因子：
6.1
作者：
Zhang Zhongsheng;Wang Jian Jim;Lyu Xianguo;Jiang Ming;Bhadha Jehangir;Wright Alan
通讯作者：
Wright Alan
影响因子：
2.6
作者：
R. Wetzel
通讯作者：
R. Wetzel