Assessment of carbon sink potential and methane reduction scenarios of marine macroalgae(Gracilaria)cultivation  

作　　者：Yifan XU Huanping LIU Yufeng YANG Hongtao SHEN Ruimin ZHANG Cheng WANG Zhijian HUANG Jianguo HE Zhili HE Qingyun YAN 

机构地区：[1]Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai,519082,China [2]School of Environmental Science and Engineering/School of Marine Science/School of Life Science,Sun Yat-sen University,Guangzhou,510006,China [3]College of Life Science and Technology/School of Management/Human and Natural Life Community Laboratory,Jinan University,Guangzhou,510632,China [4]State Key Laboratory of Biocontrol,Sun Yat-Sen University,Guangzhou,510275,China

出　　处：《Science China Earth Sciences》2023年第5期1047-1061,共15页中国科学（地球科学英文版）

基　　金：supported by the Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)(Grant No.SML2021SP203)。

摘　　要：Marine macroalgae cultivation is an important part of the effort to address climate change through carbon sinks.Gracilaria,especially Gracilaria lemaneiformis and Gracilaria lichenoides are the major macroalgae cultivated in China.This study proposes a method to assess the net carbon sink of marine macroalgae(Gracilaria)cultivation.First,the net carbon sink of Gracilaria cultivation in China is calculated based on the yield of annual cultivated Gracilaria recorded in China Fishery Statistical Yearbook from 2011 to 2020.Next,we predict the net carbon sink trend of Gracilaria cultivation from 2021 to 2030 using the autoregressive integrated moving average model(ARIMA).Finally,the potential carbon sink increase and methane reduction related to Gracilaria cultivation in China is explored through a scenario analysis.We find that the net carbon sink of Gracilaria cultivation in China was about 32.1-92.4 kilotons per year from 2011 to 2020,and shows a great annual growth trend.Moreover,the predicted net carbon sink of Gracilaria cultivation would increase to 77.8-191.4 kilotons per year from 2021 to2030,thereby could contribute considerably in the achievement of China's carbon peak goal.Under a scenario of producing ruminant green feed with additional Gracilaria cultivation,each ton of macroalgae is predicted to reduce carbon emission(i.e.,methane)by 0.33-0.68 tons.Thus,marine macroalgae cultivation might form a synergistic chain of"carbon sink increase-water purification-economy-methane reduction".This study proposes a synergistic new model that operates through marine macroalgae cultivation,economic aquaculture,and green feed production.

关 键 词：Marine mactoalgae GRACILARIA Carbon sink increase Methane reduction Synergistic efficency 

分 类 号：X173[环境科学与工程—环境科学]