Spatial dynamics of dissolved organic matter among different segments of a large-scale reservoir in the water-level declining period
Large-scale reservoirs exhibit complex hydrological conditions and exert a significant alteration on river flowing. Although dissolved organic matter (DOM) is noted to involve in biogeochemical processes, the variation mechanism of DOM chemistry across a large-scale reservoir is not well assessed. H...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2022-08-01
|
| Series: | Frontiers in Environmental Science |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fenvs.2022.962706/full |
| _version_ | 1811345131239899136 |
|---|---|
| author | Kai Wang Shangbin Xiao Jia Liu Penghui Li Penghui Li Chen He Quan Shi Ding He Ding He |
| author_facet | Kai Wang Shangbin Xiao Jia Liu Penghui Li Penghui Li Chen He Quan Shi Ding He Ding He |
| author_sort | Kai Wang |
| collection | DOAJ |
| description | Large-scale reservoirs exhibit complex hydrological conditions and exert a significant alteration on river flowing. Although dissolved organic matter (DOM) is noted to involve in biogeochemical processes, the variation mechanism of DOM chemistry across a large-scale reservoir is not well assessed. Here, we investigated four tributaries across different segments (e.g., the front and non-front areas) of the world’s largest Three Gorges Reservoir (TGR). Optical techniques and ultrahigh-resolution mass spectrometry were used to comprehensively explore the variation of DOM chemistry across TGR in the water-level declining period, and biological incubation experiments were conducted to trace its biogeochemical influences. We found that the variation of DOM composition and property between tributary and river mouth sites show different patterns between front and non-front areas of TGR. In particular, there was more terrestrial derived and biologically recalcitrant DOM in the river mouth than tributaries in the front area, while the opposite variation was observed in the non-front area. Integrated with hydrological information, the results demonstrated that the density current exerts a significant influence on DOM dynamics. Furthermore, the biological incubation experiments suggested that this variation of DOM property among tributaries would involve in the spatial dynamics of carbon dioxide (CO2) was emitted in TGR that more CO2 was emitted in the tributary of the front area than of the non-front area during the water-level declining period. |
| first_indexed | 2024-04-13T19:58:29Z |
| format | Article |
| id | doaj.art-9252abf3c60846dfbcb5d87fb4aa9179 |
| institution | Directory Open Access Journal |
| issn | 2296-665X |
| language | English |
| last_indexed | 2024-04-13T19:58:29Z |
| publishDate | 2022-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Environmental Science |
| spelling | doaj.art-9252abf3c60846dfbcb5d87fb4aa91792022-12-22T02:32:16ZengFrontiers Media S.A.Frontiers in Environmental Science2296-665X2022-08-011010.3389/fenvs.2022.962706962706Spatial dynamics of dissolved organic matter among different segments of a large-scale reservoir in the water-level declining periodKai Wang0Shangbin Xiao1Jia Liu2Penghui Li3Penghui Li4Chen He5Quan Shi6Ding He7Ding He8Organic Geochemistry Unit, School of Earth Sciences, Zhejiang University, Hangzhou, ChinaCollege of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang, ChinaCollege of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang, ChinaSchool of Marine Sciences, Sun Yat-sen University, Zhuhai, ChinaSouthern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, ChinaState Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing,ChinaState Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing,ChinaOrganic Geochemistry Unit, School of Earth Sciences, Zhejiang University, Hangzhou, ChinaDepartment of Ocean Science and Hong Kong Branch of the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Hong Kong, Hong Kong SAR, ChinaLarge-scale reservoirs exhibit complex hydrological conditions and exert a significant alteration on river flowing. Although dissolved organic matter (DOM) is noted to involve in biogeochemical processes, the variation mechanism of DOM chemistry across a large-scale reservoir is not well assessed. Here, we investigated four tributaries across different segments (e.g., the front and non-front areas) of the world’s largest Three Gorges Reservoir (TGR). Optical techniques and ultrahigh-resolution mass spectrometry were used to comprehensively explore the variation of DOM chemistry across TGR in the water-level declining period, and biological incubation experiments were conducted to trace its biogeochemical influences. We found that the variation of DOM composition and property between tributary and river mouth sites show different patterns between front and non-front areas of TGR. In particular, there was more terrestrial derived and biologically recalcitrant DOM in the river mouth than tributaries in the front area, while the opposite variation was observed in the non-front area. Integrated with hydrological information, the results demonstrated that the density current exerts a significant influence on DOM dynamics. Furthermore, the biological incubation experiments suggested that this variation of DOM property among tributaries would involve in the spatial dynamics of carbon dioxide (CO2) was emitted in TGR that more CO2 was emitted in the tributary of the front area than of the non-front area during the water-level declining period.https://www.frontiersin.org/articles/10.3389/fenvs.2022.962706/fullThree Gorges Reservoirdissolved organic mattercarbon cyclingwater-level declining periodspatial dynamics |
| spellingShingle | Kai Wang Shangbin Xiao Jia Liu Penghui Li Penghui Li Chen He Quan Shi Ding He Ding He Spatial dynamics of dissolved organic matter among different segments of a large-scale reservoir in the water-level declining period Frontiers in Environmental Science Three Gorges Reservoir dissolved organic matter carbon cycling water-level declining period spatial dynamics |
| title | Spatial dynamics of dissolved organic matter among different segments of a large-scale reservoir in the water-level declining period |
| title_full | Spatial dynamics of dissolved organic matter among different segments of a large-scale reservoir in the water-level declining period |
| title_fullStr | Spatial dynamics of dissolved organic matter among different segments of a large-scale reservoir in the water-level declining period |
| title_full_unstemmed | Spatial dynamics of dissolved organic matter among different segments of a large-scale reservoir in the water-level declining period |
| title_short | Spatial dynamics of dissolved organic matter among different segments of a large-scale reservoir in the water-level declining period |
| title_sort | spatial dynamics of dissolved organic matter among different segments of a large scale reservoir in the water level declining period |
| topic | Three Gorges Reservoir dissolved organic matter carbon cycling water-level declining period spatial dynamics |
| url | https://www.frontiersin.org/articles/10.3389/fenvs.2022.962706/full |
| work_keys_str_mv | AT kaiwang spatialdynamicsofdissolvedorganicmatteramongdifferentsegmentsofalargescalereservoirinthewaterleveldecliningperiod AT shangbinxiao spatialdynamicsofdissolvedorganicmatteramongdifferentsegmentsofalargescalereservoirinthewaterleveldecliningperiod AT jialiu spatialdynamicsofdissolvedorganicmatteramongdifferentsegmentsofalargescalereservoirinthewaterleveldecliningperiod AT penghuili spatialdynamicsofdissolvedorganicmatteramongdifferentsegmentsofalargescalereservoirinthewaterleveldecliningperiod AT penghuili spatialdynamicsofdissolvedorganicmatteramongdifferentsegmentsofalargescalereservoirinthewaterleveldecliningperiod AT chenhe spatialdynamicsofdissolvedorganicmatteramongdifferentsegmentsofalargescalereservoirinthewaterleveldecliningperiod AT quanshi spatialdynamicsofdissolvedorganicmatteramongdifferentsegmentsofalargescalereservoirinthewaterleveldecliningperiod AT dinghe spatialdynamicsofdissolvedorganicmatteramongdifferentsegmentsofalargescalereservoirinthewaterleveldecliningperiod AT dinghe spatialdynamicsofdissolvedorganicmatteramongdifferentsegmentsofalargescalereservoirinthewaterleveldecliningperiod |