High potential in synergizing the reduction of dissolved organic carbon concentration and carbon dioxide emissions for submerged-vegetationcovered river networks  

作　　者：Qingqian Li Ruixia Liu Zhangmu Jing Yanjie Wei Shengqiang Tu Huibin Yu Hongjie Gao Peng Yuan 

机构地区：[1]State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Science,Beijing 100012,China [2]State Environmental Protection Key Laboratory of Estuarine and Coastal Environment,Chinese Research Academy of Environmental Science,Beijing 100012,China [3]State Key Laboratory of Pollution Control and Resource Reuse,College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China [4]College of Municipal and Environmental Engineering,Shenyang Jianzhu University,Shenyang 110168,China

出　　处：《Journal of Environmental Sciences》2025年第5期298-309,共12页环境科学学报(英文版)

基　　金：supported by the Youth Exploration Foundation of Chinese Research Academy of Environmental Sciences(No.2022YSKY-55).

摘　　要：Various technologies and projects have been explored and developed for the synergetic control of environmental pollution and carbon emissions in aquatic ecosystems.Planting submerged vegetation in shallow waters was also expected to achieve this purpose.However,the magnitude and mechanism of carbon dioxide(CO_(2))emission affected by submerged vegetation is not clear enough in complex aquatic ecosystems.This study investigated the influences of submerged plants on CO_(2)emission,ecosystem metabolism features,and microbial community traits based on observations in river networks on the Changjiang River Delta.The results showed that CO_(2)emission from planted waters accounted for 73%of unplanted waters.Meanwhile,planted waters had higher dissolved organic carbon removal capacity in overlying water and higher potential of carbon sequestration in sediment at the same time.These distinctions between the two habitats were attributed to(1)improved CO_(2)and bicarbonate consumption in water columns via enhancing photosynthesis and(2)inhibited CO_(2)production by reconstructing the benthic microbial community.Additional eco-advantages were found in planted sediments,such as a high potential of methane oxidation and xenobiotics biodegradation and a low risk of becoming black and odorous.In brief,submerged vegetation is beneficial in promoting pollution removal and carbon retention synchronously.This study advances our understanding of the feedback between aquatic metabolism and CO_(2)emission.

关 键 词：Mitigated CO_(2)emission Submerged vegetation Paired O_(2)-CO_(2)departure Carbon uptake velocity Microbial metabolism pathways The Changjiang River 

分 类 号：X52[环境科学与工程—环境工程]