Microcosm study on fate and dynamics of mangrove tannins during leaf litter leaching  

作　　者：Hai-Chao Zhou Hui-Xing Kang Jian Wei Chang-Jun Gao Muzammil Hussain Yi-Jian Fu Ming-Dang Li Feng-Lan Li Steven Jing-Liang Xu Fred Wang-Fat Lee Ming-Guo Jiang Yi-Bing Wang Xiao-Xia Chen Nora Fung-Yee Tam Tao Lang 

机构地区：[1]Greater Bay Area Coastal Mangrove Wetland Research&Development Centre,MNR Key Laboratory for Geo-Environmental Monitoring of Great Bay Area,College of Life Sciences and Oceanography,Shenzhen University,Shenzhen 518060,China [2]Institute of Ecology,College of Urban and Environmental Sciences and Key Laboratory for Earth Surface Processes of Ministry of Education,Peking University,Beijing 100091,China [3]Guangdong Provincial Key Laboratory of Silviculture,Protection and Utilization,Guangdong Academy of Forestry,Guangzhou 510520,China [4]School of Science and Technology,The Hong Kong Metropolitan University,Kowloon,Hong Kong 999077,SAR,China [5]Guangxi Key Laboratory for Polysaccharide Materials and Modifications,School of Marine Sciences and Biotechnology,Guangxi Minzu University,Nanning 530008,China [6]State Key Laboratory of Marine Pollution,City University of Hong Kong,Kowloon,Hong Kong 999077,SAR,China

出　　处：《Ecological Processes》2023年第1期520-533,共14页生态过程（英文）

基　　金：supported by the National Natural Science Foundation of China(41876090,32101367,41976161);the Guangdong Basic and Applied Basic Research Foundation(2022A1515010698);the Science,Technology,and Innovation Commission of Shenzhen Municipality(JCYJ20220818095601003,JCYJ20170818092901989,20200827115203001);the Research Grants Council of the Hong Kong Special Administrative Region,China(UGC/IDS(R)16/19).

摘　　要：Background Mangrove tannins can participate in wetland biogeochemical cycling.However,their fate and dynamics during leaf litter leaching have yet to be elucidated in coastal aquatic environments.Methods By using a simulated microcosm experiment,changes in leaf litter mass and tannin compounds,including total phenolics(TP),extractable condensed tannins(ECT),and bound condensed tannins(BCT),were examined in the litters and leachates of four common mangrove species:Kandelia obovata(Ko),Aegiceras corniculatum(Ac),Sonneratia apetala(Sa),and Avicennia marina(Am).Results Leaching caused a notable decline in litter mass,TP,and ECT in the leaf litter of Ko,Ac,Sa,and Am,while BCT increased significantly in Ko and Ac.Loss in foliar TP was higher than in leaf litter mass,and loss in foliar ECT was higher than in TP of Ko and Ac,but Sa showed the opposite result.The temporal changes of TP and ECT concentrations in leachates followed a similar trend,with an initial increase followed by a decrease.ECT dynamics in Ko and Ac leachates correlated with their TP concentrations,while in Sa leachate,the peak ECT occurred 72 h later than its TP peak.The leachate ECT concentrations were highest in Ac,followed by Ko,and significantly lower in Sa.The peak TP and ECT proportions in leachates accounted for 9.2-23.9%and 7.7-9.4%of the total decreases in foliar TP and ECT,respectively.Conclusion During the leaching process,tannins’fate was species-specific,while the dynamics were almost similar.

关 键 词：Mangrove tannins Leaf litter decomposition LEACHING Total phenolics Condensed tannins 

分 类 号：S718.5[农业科学—林学] P593[天文地球—地球化学] X171.1[天文地球—地质学]