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| Tempo-spatial distribution and its influencing factors of dissolved carbon in the Dagu River, Shandong Province |
| Received:February 08, 2021 |
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| KeyWord:dissolved inorganic carbon(DIC);dissolved organic carbon(DOC);tempo-spatial distribution;CO2 partial pressure(pCO2);Dagu River |
| Author Name | Affiliation | E-mail | | DING Binglan | Key Laboratory of Coastal Environmental Processes and Ecological Restoration, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | | | JIANG Dejuan | Key Laboratory of Coastal Environmental Processes and Ecological Restoration, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China | djjiang@yic.ac.cn | | LI Xinju | College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | lxj0911@126.com | | XIA Yun | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | |
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| Abstract: |
| To understand the dynamic distribution and biogeochemical processes of carbon in rivers, seasonal and spatial characteristics of dissolved carbon(DIC and DOC) concentrations in the Dagu River, Shandong Peninsula, were investigated based on water samplings and analysis from 2018 to 2019. Distribution and its influencing factors of pCO2 were evaluated. The results showed that:the DIC concentration in the Dagu River ranged from 2.55 mg·L-1 to 34.08 mg·L-1 with an average of(12.97±7.25) mg·L-1. The DIC concentration was affected by geological environment, climatic and hydrological conditions, and cascade damming, which significantly varied over time and space(P<0.05); DIC was highest during winter and increased towards the downstream. The DOC concentration ranged from 4.22 mg·L-1 to 62.62 mg·L-1 with an average of(15.34±10.24) mg·L-1. The DOC concentration exceeded the DIC concentration, indicating that dissolved carbon was dominated by DOC rather than DIC in the Dagu River. Moreover, there was no obvious seasonal and spatial variation for DOC, mainly owing to intense human activities, such as land use type, sewage discharge, and river damming. Thirty-five percent of the samples indicated as a source of atmospheric CO2. pCO2 was higher in the upper reaches than in the middle and lower reaches, and higher in summer and autumn than in spring and winter(P<0.05). In general, strong photosynthesis in the Dagu River resulted in high DOC level but low pCO2. Therefore, the Dagu River generally displayed atmospheric CO2 sink. |
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