海洋地质与第四纪地质2026，Vol.46Issue(1)：54-62,9.DOI:10.16562/j.cnki.0256-1492.2024121301
黄河三角洲湿地芦苇在盐度梯度下光合参数变化及其对生态系统碳汇功能的贡献
Changes in photosynthetic parameters of Phragmites australis under salinity gradient in the Yellow River Delta wetland and its contribution to carbon sequestration in ecosystem
摘要
Abstract
Coastal wetlands are widely recognized as efficient carbon sink.However,the effects of ecosystem salt redistribution due to sea level rise or human activity on plant photosynthesis have not been fully studied.In this study,Phragmite australis growing in natural salinity gradient of 1.1,7.1,16.1 psu in the Yellow River Delta were selected as the research objects.The photosynthetic parameters,light response curves,and CO2 concentration response curves across different seasons were measured using a portable photosynthetic fluorescence measurement system(Li-6800,LI-COR,USA).The growth characteristics and chlorophyll content were measured simultaneously.Results reveal that salinity reduced the shoot height and basal diameter of P.australis,and high salinity retarded the growth of shoot height.In July,when the average ambient temperature exceeded the optimum temperature of 25℃for photosynthesis of P.australis,the photosynthetic rates(Pn)in 7.1 and 16.1 psu salinity environments were significantly lower than that in the 1.1 psu salinity environment.However,in September when the average temperature was relatively lower,Pn of P.australis in 16.1 psu was higher than that in lower salinity environments.In particular,the maximum net photosynthetic rate(Pnmax and Anmax)of P.australis in medium-salinity environments could be up to 40.3%higher than that in low-and high-salinity environments.These findings suggest that future sea level rise may enhance the carbon sequestration potential of P.australis wetland distributed in the freshwater environments of the upper delta plain.Additionally,this study has significant implications for related disciplines to improve salt-tolerant crop varieties and restore ecosystems in saline-alkali lands.关键词
植物生长/叶绿素/光响应/CO2响应/光合作用/碳汇/海平面上升Key words
plant growth/chlorophyll/light response/CO2 response/photosynthesis/carbon sink/sea level rise分类
海洋科学引用本文复制引用
李岩,谢柳娟,叶思源,高宗军,陈洋洋,何磊,丁喜桂..黄河三角洲湿地芦苇在盐度梯度下光合参数变化及其对生态系统碳汇功能的贡献[J].海洋地质与第四纪地质,2026,46(1):54-62,9.基金项目
国家自然科学基金区域发展联合基金重点项目"黄河三角洲滨海湿地生态系统的碳汇过程及调控机制"(U22A20558) （U22A20558）
国家林业和草原局应急揭榜挂帅项目"热带与亚热带地区互花米草可持续控制技术应用示范"(202302) （202302）
崂山实验室科技创新项目(LSKJ202204003) （LSKJ202204003）
国家重点研发计划中美政府间科技创新重点专项项目(2016YFE0109600) （2016YFE0109600）
中国地质调查局项目(DD20189503,DD20221775) （DD20189503,DD20221775）
山东省自然科学基金资助项目(ZR2023MD060) （ZR2023MD060）
