Dissolved Organic Matter Characteristics and Composition of Saline Lakes in the Badain Jaran Desert, China

被引：4

作者：

Zhang, Qiang ^{[1
,2
,3
]}

Wang, Yinghui ^{[2
,3
]}

Zhang, Xiaolang ^{[4
]}

Mo, Xiaohan ^{[5
]}

Zhang, Peng ^{[2
,3
]}

Li, Hailong ^{[2
,3
]}

Jiao, Jiu Jimmy ^{[6
]}

He, Chen ^{[7
]}

Shi, Quan ^{[7
]}

Fu, Qinglong ^{[8
]}

Chen, Baiyang ^{[9
]}

Wang, Junjian ^{[2
,3
]}

机构：

[1] Harbin Inst Technol, Sch Environm, Harbin 150090, Heilongjiang, Peoples R China

[2] Southern Univ Sci & Technol, Sch Environm Sci & Engn, Guangdong Key Lab Soil & Groundwater Pollut Contro, Shenzhen 518055, Guangdong, Peoples R China

[3] Southern Univ Sci & Technol, State Environm Protect Key Lab Integrated Surface, Sch Environm Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China

[4] Florida Atlantic Univ, Dept Geosci, Boca Raton, FL 33431 USA

[5] Peking Univ, Sch Urban Planning & Design, Shenzhen Grad Sch, Shenzhen 518055, Guangdong, Peoples R China

[6] Univ Hong Kong, Dept Earth Sci, Hong Kong 999077, Peoples R China

[7] China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China

[8] China Univ Geosci, Sch Environm Studies, Wuhan 430074, Hubei, Peoples R China

[9] Harbin Inst Technol Shenzhen, State Key Lab Urban Water Resource & Environm, Shenzhen Key Lab Organ Pollut Prevent & Control, Shenzhen 518055, Guangdong, Peoples R China

来源：

ACS EARTH AND SPACE CHEMISTRY | 2023年 / 7卷 / 11期

基金：

中国国家自然科学基金;

关键词：

saline lakes; dissolved organic matter; spectroscopiccharacteristics; ultrahigh resolution mass spectrometry; random forest; CARBON; FLUORESCENCE; COASTAL; INDEX; WATER; PHOTODEGRADATION; GROUNDWATER; REACTIVITY; RECHARGE; QUALITY;

D O I：

10.1021/acsearthspacechem.3c00179

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Elucidating the characteristics and molecular composition of dissolved organic matter (DOM) is critical to understanding carbon cycling in increasingly saline lakes in arid and hyperarid areas; however, the molecular signatures of DOM in these widely distributed saline lakes remain poorly understood. Here, variations in DOM characteristics and ages with salinity were investigated across 10 small saline lakes within the Badain Jaran Desert based on absorption and fluorescence spectroscopy, Fourier transform ion cyclotron resonance mass spectrometry, and C-14-isotopic analysis. The results showed that dissolved organic carbon (DOC) significantly increased with salinity, and the C-14 age of solid-phase extracted DOM ranging 385-3935 years before present did not correlate with salinity across lakes. With increasing salinity, the DOM aromaticity, DOC-specific abundances of fluorescent components, and relative abundance of lignin-like components all decreased, whereas the relative abundance of lipid-like components increased. Regarding halogen-containing DOM, the brine lakes showed higher relative abundances of chlorine-containing lignin- and lipid-like components but comparable relative abundances of bromine-containing components, supporting preferential chlorination over bromination. This study demonstrates the strong impacts of salinization on DOM accumulation and chlorination in inland saline lakes and highlights the critical role of brine lakes as a persistent carbon pool.

引用

页码：2239 / 2251

页数：13