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The fate of carbon resulting from pore water exchange in a mangrove and Spartina alterniflora ecozone

海洋学报:英文版 2023年第8期42卷 61-76页

作者： Weizhen Jiang Guizhi Wang Qing Li Manab Kumar Dutta Shilei Jin Guiyuan Dai Yi Xu State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361102China College of Ocean and Earth Sciences Xiamen UniversityXiamen 361102China Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies Xiamen UniversityXiamen 361102China National Observation and Research Station for the Taiwan Strait Marine Ecosystem Xiamen UniversityZhangzhou 363000China Key Laboratory of Coastal Environment and Resources of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310000China

Mangrove and salt-marsh wetlands are important coastal carbon *** order to quantify carbon export via pore water exchange and to evaluate subsequent fate of the exported carbon,we carried out continuous observations in a mangrove-Spartina alterniflora ecozone in the Zhangjiang River Estuary,*** carbon fluxes via pore water exchange were estimated using^(222)Rn and^(228)Ra as tracers to be(2.15±0.63)mol/(m^(2)∙d)for dissolved inorganic carbon(DIC)and(-0.008±0.07)mol/(m^(2)∙d)for dissolved organic carbon(DOC)in the wet season and(3.02±0.65)mol/(m^(2)∙d)for DIC and(-0.15±0.007)mol/(m^(2)∙d)for DOC in the dry season in the mangrove-dominated creek(M-creek),while(2.52±0.82)mol/(m^(2)∙d)for DIC and(0.02±0.09)mol/(m^(2)∙d)for DOC in the dry season in the ***-dominated creek(SA-creek).The negative value means that pore water was a sink of DOC in the *** total carbon via pore water exchange in the tidal creeks in the mangroves accounted for 41%-55%of the net carbon fixed by mangrove vegetation and was 3-4 times as much as the soil carbon accretion in the *** exported carbon in the form of DIC contributed all of the carbon outwelling from the M-creek and 79%of the carbon outwelling from the SA-creek,implying effective fixation of carbon by the wetland ***,it resulted in 54%in the dry season,75%in the wet season of the carbon dioxide released from the M-creek to the atmosphere,and 84%of the release from the ***,quantification of pore water exchange and related soil carbon loss is essential to trace the fate of carbon fixed in intertidal wetlands.

关键词： mangrove salt-marsh carbon dioxide carbon accretion carbon outwelling pore water exchange

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Lateral detrital C transfer across a Spartina alternifora invaded estuarine wetland

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Ecological Processes 2021年第1期10卷 980-998页

作者： Yu Gao Jiquan Chen Tingting Zhang Bin Zhao Steven McNulty Haiqiang Guo Feng Zhao Ping Zhuang Key Laboratory of East China Sea&Oceanic Fishery Resources Exploitation and Utilization Scientifc Observing and Experimental Station of Fisheries Resources and Environment of East China Sea and Yangtze EstuaryEast China Sea Fisheries Research InstituteChinese Academy of Fishery SciencesShanghai 200090China. Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering Coastal Ecosystems Research Station of the Yangtze River Estuaryand Institute of Eco-Chongming(IEC)Fudan UniversityShanghai 200438China. Department of Geological Sciences University of Texas at AustinAustinTX 78712USA. Department of Geography and Center for Global Change and Earth Observations(CGCEO) Michigan State UniversityEast LansingMI 48824USA. Eastern Forest Environmental Threat Assessment Center Southern Research StationUSDA Forest ServiceResearch Triangle ParkNC 27709USA.

Background:The lateral movements of mass and energy across the terrestrial-aquatic interface are being increasingly recognized for their importance in the carbon(C)balance of coastal/estuarine *** quantifed the lateral fux of detrital C in the Yangtze estuary where invasive Spartina alternifora has substantially and extensively altered the ecosystem structure and *** overall objective was to close the C budget of estuarine wetlands through feld sampling,tower-based measurements,and ***:A lateral detrital C exchange evaluation platform was established in a case study of the Yangtze River Estuary to investigate the efect of ecosystem structural changes on lateral detrital C transfer *** study estimated the lateral detrital C exchange based on the gross primary production(GPP)by performing coupled modeling and feld ***-based measurements and MODIS time series and CH4 outgassing and biomass simultaneously measured the lateral detrital C fux to characterize the relative contributions of lateral(i.e.,detritus)C fuxes to the annual marsh C ***:The C pools in the plants and soil of Spartina marshes were signifcantly higher than those of the native community dominated by Phragmites *** GPP based on MODIS(GPPMODIS)was 472.6 g C m^(−2) year^(−1) and accounted for 73.0%of the GPP estimated from eddy covariance towers(GPPEC)(646.9±70.7 g C m^(−2) year^(−1)).We also detected a higher GPPMODIS during the pre-growing season,which exhibited a similar lateral detrital C fux *** average,25.8%of the net primary production(NPP),which ranged from 0.21 to 0.30 kg C m^(−2) year^(−1),was exported during lateral *** annual C loss as CH4 was estimated to be 17.9±3.7 g C m^(−2) year^(−1),accounting for 2.8%of the *** net positive detrital C fux(i.e.,more detritus leaving the wetlands),which could exceed 0.16 kg C m^(−2) day^(-1),was related to daily ***,the observed lateral detrital C fu

关键词： Estuarine wetland carbon outwelling Lateral carbon fux Methane emission Spartina alternifora Phragmites australis

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