摘要
岩溶碳汇是实现碳中和的重要手段,其稳定性是亟待解决的关键科学问题。地球上每年约45%的光合作用发生在水环境中,而岩溶区沉水植物如何影响岩溶碳汇稳定性仍不明确。以3条岩溶区河流中的沉水植物为研究对象,利用样方法、pH-drift技术和元素化学计量学,从定性和定量角度开展了沉水植物对岩溶碳汇稳定性的影响研究。结果表明:ZDR中沉水植物有8种,CTR中沉水植物有5种,HXR中沉水植物有7种,Shannon-Wiener多样性指数和Simpson优势度指数的趋势均为ZDR>HXR>CTR。在3条河流中沉水植物的优势种为苦草、海菜花、竹叶眼子菜和黑藻,且均具有利用HCO-3的能力。ZDR、HXR和CTR中沉水植物的年固碳量分别为8.56×10^(3)、4.83×10^(3)和3.88×10^(3) g·m^(-2)·a^(-1),平均值为5.76×10^(3) g·m^(-2)·a^(-1),分别是草地的37.65倍和人工林的40.56倍。3条河流中沉水植物多样性越高,其固碳量也越高。总的来说,在岩溶水生态系统中沉水植物发挥着碳泵的作用,进而提高了岩溶碳汇的稳定性。
Karst carbon sinks are an important means of achieving carbon neutrality,and their stability is a key scientific issue that needs to be addressed.Approximately 45%of annual photosynthesis on Earth occurs in aquatic environments,yet how submerged plants in karst areas affect the stability of karst carbon sinks remains unknown.This study focused on submerged plants in three karst rivers.We employed quadrat sampling,pH-drift technology,and elemental stoichiometry to qualitatively and quantitatively examine the effects of submerged plants on the stability of karst carbon sinks.Our results showed that there were 8,5,and 7 species of submerged plants in the ZDR,CTR,and HXR,respectively.The Shannon-Wiener diversity index and Simpson dominance index ranked as ZDR>HXR>CTR.In the three karst rivers,Vallisneria natans,Ottelia acuminata,Potamogeton wrightii,and Hydrilla verticillata were the dominant species,all of which had the ability to utilize HCO-3.The annual carbon sequestration rates of submerged plants in the ZDR,HXR,and CTR were 8.56×10^(3) g·m^(-2)·a^(-1),4.83×10^(3) g·m^(-2)·a^(-1),and 3.88×10^(3) g·m^(-2)·a^(-1),respectively,with an average of 5.76×10^(3) g·m^(-2)·a^(-1),which are 37.65 and 40.56 times higher than those of grasslands and man-made forests,respectively.The higher the diversity of submerged plants in rivers,the higher the carbon sequestration.Overall,submerged plants play a crucial carbon pump role in karst aquatic ecosystems,thereby enhancing the stability of karst carbon sink.
作者
孙彩云
郑冰清
李俊
符洪铭
孙荣卿
刘红豪
廖祖莹
江红生
吴振斌
夏世斌
王培
SUN Caiyun;ZHENG Bingqing;LI Jun;FU Hongming;SUN Rongqing;LIU Honghao;LIAO Zuying;JIANG Hongsheng;WU Zhenbin;XIA Shibin;WANG Pei(State Key Laboratory of Freshwater Ecology and Biotechnology,Institute of Hydrobiology,Chinese Academy of Sciences,Wuhan 430072,China;School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China;Kunming General Survey of Natural Resources Center,China Geological Survey,Kunming 650111,China;College of Environmental Science and Engineering,Guilin University of Technology,Guilin 541006,China;Wuhan Botanical Garden,Chinese Academy of Sciences,Wuhan 430074,China)
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2024年第5期430-439,共10页
Earth Science Frontiers
基金
国家自然科学基金项目(41807205,42172285)
中国地质调查局云贵高原湖区湖泊调查项目(DD20230512)
自然资源部自然生态系统碳汇工程技术创新中心科创课题([2023]10-2023-03)
广西重点研发计划项目(2023AB06025)
中国科学院乡村振兴项目(KFJ-XCZX-202303)
桂林市科学研究与技术开发计划项目(2020010905)
自然资源部自然资源科技战略研究项目(2023-ZL-23)。
关键词
岩溶碳汇
沉水植物固碳
植物多样性
优势种植物
河流类型
karst carbon sink
carbon sequestration by submerged plants
plant diversity
dominant species of plants
river types
