Lateral detrital C transfer across a Spartina alternifora invaded estuarine wetland  

作　　者：Yu Gao Jiquan Chen Tingting Zhang Bin Zhao Steven McNulty Haiqiang Guo Feng Zhao Ping Zhuang 

机构地区：[1]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 Estuary,East China Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Shanghai 200090,China. [2]Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering,Coastal Ecosystems Research Station of the Yangtze River Estuary,and Institute of Eco-Chongming(IEC),Fudan University,Shanghai 200438,China. [3]Department of Geological Sciences,University of Texas at Austin,Austin,TX 78712,USA. [4]Department of Geography and Center for Global Change and Earth Observations(CGCEO),Michigan State University,East Lansing,MI 48824,USA. [5]Eastern Forest Environmental Threat Assessment Center,Southern Research Station,USDA Forest Service,Research Triangle Park,NC 27709,USA.

出　　处：《Ecological Processes》2021年第1期980-998,共19页生态过程（英文）

基　　金：supported by the Open Research Fund of the State Key Laboratory of Estuarine and Coastal Research(Grant No.SKLEC-KF201912);the Foundation of Key Laboratory of Yangtze River Water Environment,Ministry of Education(Tongji University),China,(Grant No.YRWEF202105);the Natural Science Fund of Shanghai(Grant No.19ZR1470300);the Natural Science Foundation of China(Grant No.32071584);the Special Fund for Natural Resources Development of Jiangsu Province(Marine Science and Technology Innovation)(Grant No.JSZRHYKJ202109);the Central Public-interest Scientifc Institution Basal Research Fund,ECSFR,CAFS(Grant No.2021M04).

摘　　要：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 wetlands.We quantifed the lateral fux of detrital C in the Yangtze estuary where invasive Spartina alternifora has substantially and extensively altered the ecosystem structure and functions.Our overall objective was to close the C budget of estuarine wetlands through feld sampling,tower-based measurements,and modeling.Methods: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 processes.This study estimated the lateral detrital C exchange based on the gross primary production(GPP)by performing coupled modeling and feld sampling.Tower-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 budget.Results:The C pools in the plants and soil of Spartina marshes were signifcantly higher than those of the native community dominated by Phragmites australis.The 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 magnitude.On 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 exchange.The 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 GPPEC.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 tides.However,the observed lateral detrital C fux based on monthly sampling

关 键 词：Estuarine wetland Carbon outwelling Lateral carbon fux Methane emission Spartina alternifora Phragmites australis 

分 类 号：X17[环境科学与工程—环境科学]