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Lateral detrital C transfer across a Spartina alternifora invaded estuarine wetland

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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Evaluation of the Bioavailability of Metals in Sediment from the Southern Coastal wetland of the Qiantang Estuary by Using Diffusive Gradients in Thin Films Technique

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Journal of Ocean University of China 2022年第2期21卷 375-387页

作者： FENG Weihua WANG Zhifu ZHU Wenzhuo ZHENG Fangqin ZHANG Dongrong XU Hengtao Key Laboratory of Engineering Oceanography Second Institute of OceanographyMNRHangzhou 310012China College of Marine Science&Technology Zhejiang Ocean UniversityZhoushan 316022China

Metal pollution has become an major issue governing the wetland ecosystem *** southern coastal wetland of the Qiangtang Estuary are facing unusual perturbation due to rapid development along the embayment in recent *** study evaluated the bioavailability of metals(Cu,Pb,Cd,Cr and Zn)in the sediment of the southern coastal wetland of the Qiangtang Es-tuary using diffusive gradients in thin films(DGT)techniques and compared with several methods based on total metal *** results showed that the contents of Cr,Pb,Cd and Cu in sediment,as detected using DGT,were considerably correlated with the exchangeable fraction and the content in Phragmites australis roots,while a weak correlation was observed for ***,DGT analysis could be used to evaluate the bioavailability and potential risk of Cr,Cd,Pb and Cu for *** indices,such as DGT concentration,bioaccumulation in ***,geoaccumulation index(Igeo)and potential ecological risk index(RI),revealed that Cd was a major potential ecological risk factor along the southern coast wetland of the Qiantang Estuary,especially in the upstream region,which is potentially more vulnerable to the anthropogenic pollution.

关键词： diffusive gradients in thin films estuarine wetland metal bioavailability

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