水葱和香蒲叶经济性状对模拟增温和CO_(2)浓度倍增的响应  

Responses of leaf economic traits of Scirpus validus and Typha orientalis to simulated warming and CO_(2) concentration multiplication

作　　者：余洪艳 孙梅 冯春慧[1] 许俊萍 陈弘毅 刘振亚[3] YU Hongyan;SUN Mei;FENG Chunhui;XU Junping;CHEN Hongyi;LIU Zhenya(Yunnan Key Laboratory of Plateau Wetland Conservation,Restoration and Ecological Services,Kunming 650224,China;National Plateau Wetlands Research Center,Southwest Forestry University,Kunming 650224,China;National Wetland Ecosystem Fixed Research Station of Yunnan Dianchi,Jinning 650600,Yunnan,China)

机构地区：[1]云南省高原湿地保护修复与生态服务重点实验室,昆明650224 [2]西南林业大学,国家高原湿地研究中心,昆明650224 [3]云南滇池湿地生态系统国家定位观测研究站,云南晋宁650600

出　　处：《广西植物》2023年第9期1588-1599,共12页Guihaia

基　　金：国家自然科学基金(31760115);云南省教育厅科学研究基金(2019Y0142);云南省高原湿地保护修复与生态服务重点实验室(培育)开放基金(202105AG070002)。

摘　　要：气候变化是国际社会共同关注的环境问题,植物对气候变化的响应反映了植物应对气候变化的生长和生存策略。叶经济性状与植物对资源的获取、利用和储存直接相关,并且受到温度条件和CO_(2)浓度的显著影响。该文采用人工环境控制系统封顶式生长室研究广布湿地植物水葱(Scirpus validus)和香蒲(Typha orientalis)的叶经济性状对模拟增温(现行环境温度+2℃)和CO_(2)浓度倍增(增至850μmol·mol^(-1))的响应。结果表明:(1)增温处理下,水葱净光合速率、氮含量和磷含量显著降低,但其胞间CO_(2)浓度和比叶重显著增加;CO_(2)浓度倍增处理下,水葱胞间CO_(2)浓度和净光合速率均显著降低,但比叶重显著增加。(2)增温处理下香蒲的比叶重显著增加,而氮含量和磷含量显著降低;香蒲的光合参数、氮含量和磷含量在CO_(2)浓度倍增处理下均显著降低,而比叶重显著增加。(3)水葱的比叶重、氮含量、磷含量、净光合速率、气孔导度、胞间CO_(2)浓度与主成分分析的两个环境变量相关;而香蒲的经济性状均与两个环境变量相关,表明这些经济性状在香蒲响应增温和CO_(2)浓度变化过程中发挥重要作用。(4)除碳含量外,水葱和香蒲的其他经济性状参数包括净光合速率、气孔导度、蒸腾速率、胞间CO_(2)浓度、氮含量、磷含量和比叶重均在响应增温和CO_(2)浓度倍增过程中发挥重要作用。总体而言,该研究结果反映了水葱和香蒲在功能性状上对增温和CO_(2)浓度倍增的响应策略。两种植物的光合能力和养分含量在两种处理下虽然均受到显著的抑制作用,但是其抗逆能力升高,表明增温和CO_(2)浓度升高不利于水葱和香蒲的生长。Climate change is an environmental issue of common concern to the international community.The response of plants to climate change reflects the growth and survival strategies of plants in response to climate change.Leaf economic traits are directly related to the resource acquisition,utilization and storage of plant,and are significantly affected by temperature conditions and CO_(2) concentration.A capped growth chamber with an artificial environment control system was used to study the response of the leaf economic traits of the widely spread wetland plants Scirpus validus and Typha orientalis to the simulated warming(current ambient temperature+2℃)and doubled CO_(2) concentration(increased to 850μmol·mol-1).The results were as follows:(1)The net photosynthetic rate,contents of N and P Scirpus validus were significantly reduced,but the intercellular CO_(2) concentration and leaf mass per area increased significantly under increased temperature treatment.Both the intercellular CO_(2) concentration and net photosynthetic rate of S.validus were significantly reduced,but the leaf mass per area was significantly increased under the treatment of doubled CO_(2) concentration.(2)Similar to S.validus,the leaf mass per area of Typha orientalis also increased significantly,while the contents of N and P were significantly reduced under warming treatment;in addition,the photosynthetic parameters,contents of N and P of T.orientalis were significantly reduced,while the leaf mass per area increased significantly under the treatment of doubled CO_(2) concentration.(3)The leaf mass per area,contents of N and P,net photosynthetic rate,stomatal conductance,and intercellular CO_(2) concentration of Scirpus validus were significantly correlated with the first two axes of the principal component analysis;while all the studied leaf economic traits of Typha orientalis were related to two environment variables,indicating that these traits played an important role in the response of plants to changes in temperature and CO_(2) concentr

关 键 词：气候变化 挺水植物 植物经济性状 元素含量 环境响应策略 

分 类 号：Q945.79[生物学—植物学]