Enhanced Carbon Sequestration Potential Following Sediment Dredging in River Ecosystems: Insights into CO2 Fluxes, Phytoplankton, and Carbon Fixation Pathway Responses.

IF 10.8 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Zhuo Hao, Shibo Chen, Qingwen Zhang, Bing Liu, Shanghong Chen
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Abstract

River systems play crucial roles in the global carbon balance; however, the environmental consequences of sediment dredging on carbon dioxide (CO2) emissions and carbon sequestration potential remain poorly understood. This study presents the first systematic investigation linking sediment dredging to long-term carbon sequestration dynamics in river ecosystems, addressing critical uncertainties in anthropogenic impacts on aquatic carbon balance. Over a three-year period, dredging significantly altered CO2 flux (fCO2) and dissolved CO2 partial pressure (pCO2), with pronounced seasonal variability driven by dissolved organic carbon as a key predictor. Microbial community composition shifted from Cyanobacteria to Gammaproteobacteria and Flavobacteria dominance, accompanied by enhanced Calvin cycle enzyme gene expression and suppression of alternative carbon fixation pathways. While phytoplankton biomass, particularly Cyanobacteria, declined sharply during dredging, carbon sequestration potential exceeded predredging levels within three years of monitoring, indicating strong resilience in riverine carbon storage capacity. Our findings indicate that (1) dredging-induced community restructuring enhances chemoautotrophic carbon fixation through modified expression of rTCA cycle components and Calvin cycle optimization, (2) phytoplankton carbon biomass and chlorophyll a emerge as primary drivers of postdredging carbon sequestration pathways, and (3) gross primary production peaks at 960.8 mg C m-2 d-1 through synergistic phytoplankton interactions. These mechanistic discoveries, which quantify relationships between microbial taxa, metabolic gene expression, and carbon fluxes, establish new insights for predicting ecosystem responses to anthropogenic disturbances in river ecosystems.

河流生态系统中泥沙疏浚后碳固存潜力的增强:对二氧化碳通量、浮游植物和碳固定途径响应的见解
河流系统在全球碳平衡中发挥着至关重要的作用;然而,沉积物疏浚对二氧化碳(CO2)排放和碳封存潜力的环境后果仍然知之甚少。本研究首次系统地研究了泥沙疏浚与河流生态系统长期固碳动态之间的联系,解决了人为影响水生碳平衡的关键不确定性。在三年的时间里,疏浚显著改变了CO2通量(fCO2)和溶解CO2分压(pCO2),溶解有机碳驱动的季节变化是一个关键预测因子。微生物群落组成由蓝藻菌群为主转变为γ变形菌群和黄杆菌群为主,同时卡尔文循环酶基因表达增强,其他碳固定途径受到抑制。虽然在疏浚过程中浮游植物生物量,特别是蓝藻生物量急剧下降,但在监测的三年内,固碳潜力超过了疏浚前的水平,表明河流碳储存能力具有很强的弹性。研究结果表明:(1)疏浚诱导的群落重组通过rTCA循环组分的表达和卡尔文循环优化增强了化学自养碳固定;(2)浮游植物碳生物量和叶绿素a成为疏浚后固碳途径的主要驱动因素;(3)浮游植物的协同相互作用使总初级产量达到960.8 mg C m-2 d-1。这些机制的发现量化了微生物分类群、代谢基因表达和碳通量之间的关系,为预测河流生态系统对人为干扰的响应建立了新的见解。
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来源期刊
环境科学与技术
环境科学与技术 环境科学-工程:环境
CiteScore
17.50
自引率
9.60%
发文量
12359
审稿时长
2.8 months
期刊介绍: Environmental Science & Technology (ES&T) is a co-sponsored academic and technical magazine by the Hubei Provincial Environmental Protection Bureau and the Hubei Provincial Academy of Environmental Sciences. Environmental Science & Technology (ES&T) holds the status of Chinese core journals, scientific papers source journals of China, Chinese Science Citation Database source journals, and Chinese Academic Journal Comprehensive Evaluation Database source journals. This publication focuses on the academic field of environmental protection, featuring articles related to environmental protection and technical advancements.
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