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Biomass accumulation and organic carbon stocks of kandelia obovata mangrove vegetation under different simulated sea levels

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Acta Oceanologica Sinica 2022年第8期41卷 78-86页

作者： Jiahui Chen Min Gao Guangcheng Chen Heng Zhu Yong Ye Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems College of the Environment and EcologyXiamen UniversityXiamen 361102China Third Institute of Oceanography Ministry of Natural ResourcesXiamen 361005China Fujian Provincial Station for Field Observation and Research of Island and Costal Zone in Zhangzhou Xiamen 361005China

Mangrove forests are vulnerably threatened by sea level rise(SLR).Vegetation organic carbon(OC)stocks are important for mangrove ecosystem carbon *** is critical to understand how SLR affects vegetation OC stocks for evaluating mangrove blue carbon budget and global climate *** this study,biomass accumulation and OC stocks of mangrove vegetation were compared among three 10 year-old kandelia obovata(a common species in China)mangrove forests under three intertidal elevations through species-specific allometric *** study simulated mangrove forests with SLR values of 0 cm,40 cm and 80 cm,respectively,representing for the current,future~100 a and future~200 a SLR of mangrove forests along the Jiulong River Estuary,*** directly decreased mangrove individual density and inhibited the growth of mangrove *** total vegetation biomasses were(12.86±0.95)kg/m^2,(7.97±0.90)kg/m^2 and(3.89±0.63)kg/m^2 at Sites SLR 0 cm,SLR40 cm and SLR 80 cm,*** total vegetation OC stock decreased by approximately 3.85 kg/m^2(in terms of C)from Site SLR 0 cm to Site SLR 80 *** lower vegetation biomass and OC stock of various components(stem,branch,leaf and root)were found at Site SLR 80 *** increments of vegetation biomass and OC stock also decreased with SLR ***,significant lower sedimentation rate was found at Site SLR 80 *** indicated that SLR will decrease mangrove vegetation biomass and OC stock,which may reduce global blue carbon sink by mangroves,exacerbate global warming and give positive feedback to SLR.

关键词： sea level rise vegetation biomass organic carbon stock component mangrove forest kandelia obovata

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Mechanisms on inhibition of photosynthesis in kandelia obovata due to extreme cold events under climate change

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Ecological Processes 2016年第1期5卷 250-260页

作者： Chunfang Zheng Jianwu Tang Jinong Chen Weicheng Liu Jianbiao Qiu Xin Peng Yong Ye Zhejiang Mariculture Research Institute Zhejiang Key Laboratory of Exploitation and Preservation of Coastal Bio-resourceWenzhou 325005ZhejiangPeople’s Republic of China Nanji Islands National Marine Nature Reserve Administration Pingyang 325401People’s Republic of China Key Laboratory of the Ministry of Eduction for Coastal and Wetland Ecosystem College of the Environment and EcologyXiamen UniversityXiamen 361005People’s Republic of China

Introduction:Mangroves that grow at the latitudinal extremes of their distribution are susceptible to extreme cold *** enhancement of low temperature stress(seLTS)is a typical characteristic of extreme cold *** temperature stress can inhibit mangrove photosynthesis,which often inhibits the growth and development of ***,the possible reasons for impairment to photosynthesis of mangroves due to extreme cold events remain ***:kandelia obovata seedlings in a growth chamber were exposed to 5℃/−2℃(day/night)for 36 h(−2℃ for 16 h)with 12 h light per day at 600μmol m^(−2) s^(−1) photosynthetic photon flux density(PPFD)(a low temperature stress,aLTS),then the plants were transferred to the control condition(15℃/10℃(day/night)and allowed to recover for 5 days(R1).The other seedlings were subjected to low temperature treatment with a day/night temperature of 5℃/−1℃ in a growth chamber for 24 *** these plants were transferred to 5℃/−2℃(day/night)under the same light and climate conditions for 36 h(two low temperature stresses,tLTS).Following the successive enhancement of low temperature treatment,these plants were returned to 15℃/10℃(day/night)for another 5-day recovery period(R2).Results:Results showed that aLTS treatment significantly reduced leaf net photosynthetic rate(P_(n))and stomatal conductance(G_(s)),while increased intercellular CO_(2) concentration(C_(i)).Photosynthetic activity of leaves quickly recovered after the plants were returned to control temperature for 5 days(R1).However,decreases in leaf Pn were more obvious under tLTS treatment than those under aLTS *** reduced Pn might be attributed to stomatal and non-stomatal ***,non-stomatal limitation played a major role in reducing Pn during tLTS treatment,as proven by reduced ribulose 1,5-biphosphate carboxylase(RuBPCase)*** limitation also enhanced lipid peroxidation in chloroplasts,decreased sucrosemetabolizing enzymes and ra

关键词： kandelia obovata Low temperature Gas exchange Sucrose synthesis Peptidase

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Recovery of photosynthesis,sucrose metabolism,and proteolytic enzymes in kandelia obovata from rare cold events in the northernmost mangrove,China

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Ecological Processes 2016年第1期5卷 108-119页

作者： Chunfang Zheng Yong Ye Weicheng Liu Jianwu Tang Chengnian Zhang Jianbiao Qiu Jinong Chen Wenzhou Ocean Research Institute Zhejiang Key Laboratory of Exploitation and Preservation of Coastal Bio-resourceZhejiang Mariculture Research InstituteWenzhou 325000China Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystem College of the Environment and EcologyXiamen UniversityXiamenChina Nanji Islands National Marine Nature Reserve Administration PingyangChina Wenzhou Vocational College of Science and Technology WenzhouChina

Introduction:Understanding how mangroves respond to rare cold events has implications for both restoration and conservation under climate change *** study investigated the responses of photosynthesis and activities of key enzymes involving carbon and nitrogen metabolism at different ages of kandelia obovata to a rare cold event in the winter of ***:This study took place on Ximen Island,Zhejiang Province,*** measured the physiological recovery of 2-3-,5-6-,9-10-and 54-55-year-old *** trees after freezing injury in February and March in 2011 and 2012,***:Chilling injury index and electrolyte leakage of *** increased with increasing tree age in the winter of 2010,and electrolyte leakage in *** at different ages in the winter of 2010 was far higher than that in the winter of *** rare cold events significantly changed the recoveries of the leaf net photosynthetic rate(Pn)and stomatal conductance(Gs);ratios of chlorophyll a/chlorophyll b(Chl a/Chl b);contents of total soluble sugar(TSS),sucrose,free amino acid(FAA),and soluble protein;and activities of sucrose phosphate synthase(SPS),endopeptidase,and carboxypeptidase in *** at different *** effects were mainly due to changes in the physiological mechanism in the 2-year-old trees.A clear decrease in Pn of the 2-year-old trees was observed in February 2011,as exemplified by reductions in ratios of Chl a/Chl b and chlorophyll/carotenoid(Chl/Car),as well as inhibition of the levels of TSS and FAA(osmotic substances).During recovery in 2011 and 2012,the activities of SPS and sucrose synthase(SS)were responsible for sucrose synthesis after the rare cold events in 2011,but only SPS activity was one of the main factors contributing to the metabolism of stachyose to sucrose without cold damage in *** played a more important role than endopeptidase during protein hydrolysis after the rare cold ***:The results suggest that

关键词： kandelia obovata Photosynthesis Sucrose synthase Rare cold events Peptidase

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