Sources and transport of organic matter in the Ganges-Brahmaputra-Meghna River system of Bengal Basin, Bangladesh

被引：6

作者：

Khan, Md Hafijur Rahaman ^{[1
,3
]}

Liu, Jianguo ^{[1
,2
]}

Rahman, Ananna ^{[1
,3
]}

Huang, Yun ^{[1
]}

Tan, Long ^{[4
,5
]}

Liu, Shengfa ^{[2
,6
]}

Chen, Zhong ^{[1
]}

机构：

[1] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China

[2] Qingdao Marine Sci & Technol Ctr, Lab Marine Geol, Qingdao 266061, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[4] Ocean Univ China, China Frontiers Sci Ctr Deep Ocean Multispheres &, Key Lab Marine Chem Theory & Technol, Minist Educ, Qingdao 266100, Peoples R China

[5] Qingdao Natl Lab Marine Sci & Technol, Lab Marine Ecol & Environm Sci, Qingdao 266061, Peoples R China

[6] Minist Nat Resources, Inst Oceanog 1, Key Lab Marine Geol & Metallogeny, Qingdao 266061, Peoples R China

来源：

MARINE POLLUTION BULLETIN | 2024年 / 208卷

关键词：

Organic matter; Bengal Basin; Ganges-Brahmaputra river system; Isotopes; SURFACE SEDIMENTS; STABLE-ISOTOPES; MARINE-SEDIMENTS; YANGTZE-RIVER; MOUNTAIN RIVERS; CARBON STORAGE; AMAZON-RIVER; NITROGEN; PRESERVATION; INDICATORS;

D O I：

10.1016/j.marpolbul.2024.116973

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This study aimed to understand the sources and transport mechanism of organic matter (OM) in the GangesBrahmaputra-Meghna (GBM) river system in Bangladesh. We conducted analyses of total organic carbon (TOC), total nitrogen (TN), their stable isotopes (delta C-13 and delta N-15), and sediment grain size. The results reveal a heterogeneous mixture of OM derived from terrestrial plants, aquatic environments, and anthropogenic sources. The Brahmaputra River exhibited higher concentrations of TOC and TN, with delta C-13 and delta N-15 values indicating that the OM is primarily sourced from C-3 plants. Conversely, the Ganges River demonstrated lower TOC levels and higher isotopic values, reflecting significant anthropogenic inputs. The Lower Meghna showed a mixture of terrestrial and marine sources. Variations in the TOC/TN ratios across the river system underscore the complex interplay between natural and anthropogenic factors. Additionally, sediment grain size plays a crucial role, with finer sediments in the Brahmaputra River associated with increased OM concentrations, while coarser sediments in the Ganges River correlate with lower TOC and TN levels.

引用

页数：9

共 113 条

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