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| Impacts of storm event on DOMcomposition and flux in two Jiulong Tributaries with different watershed features |
| Received:November 15, 2015 |
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| KeyWord:storm event;watershed features;DOM;absorption spectroscopy;fluorescence excitation emission matrix spectroscopy;carbon flux |
| Author Name | Affiliation | E-mail | | WEI Jia | Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Xiamen University, Xiamen 361005, China | | | GUO Wei-dong | Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Xiamen University, Xiamen 361005, China | wdguo@xmu.edu.cn | | WANG Zhi-heng | Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Xiamen University, Xiamen 361005, China | | | XU Jing | Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Xiamen University, Xiamen 361005, China | | | CHEN Neng-wang | Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Xiamen University, Xiamen 361005, China | | | HONG Hua-sheng | Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Xiamen University, Xiamen 361005, China | |
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| Abstract: |
| Watershed features have great impacts on river DOM composition and flux. In this study, temporal variations in DOM of the North(dominated by forestland) and West(dominated by farmland and urban area) Jiulong River were investigated during the typhoon "Matmo" in July, 2014. The DOM was characterized by DOC, absorption spectroscopy, and fluorescence excitation emission matrix spectroscopy(EEMs) analysis. The DOC concentration, absorption coefficient aCDO(350) and total DOM fluorescence intensity of both rivers increased significantly in both rising and falling hydrograph during the storm event. However, DOM abundance in the West River showed a much greater increase than that in the North River, suggesting more sensitivity of river DOM to rainstorm events in the watershed with greater anthropogenic perturbation. The specific absorption coefficient(SUVA254) of CDOM showed different variation tends between the North and West River, indicating that river DOM in forest-dominant watershed had high aromaticity and average molecular weight. The West River showed higher fluxes of DOM than the North River during storm event, which was opposite to that under the base flow condition. This reversion in DOM export flux suggested that storm event could amplify the influence of human activities in the watershed on the receiving estuarine ecosystems. The present findings are of great significance for the integrated management of coupled river-estuary system. |
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