【摘要】 为了研究芦苇(Phragmites australis)和互花米草(Spartina alterniflora)叶绿素荧光特性和环境因子对模拟增温的响应，以江苏盐城滨海湿地芦苇和互花米草为研究对象，分别设置增温组和对照组，测定环境参数和叶绿素荧光参数，分析增温对芦苇和互花米草叶绿素荧光参数的影响及其与环境因子的关系。研究结果表明，增温使芦苇叶片的实际光化学量子效率、非光化学猝灭系数和表观电子传递效率整体都有所下降，但互花米草除非光化学猝灭系数外，其他参数变化规律相反；芦苇对照组叶片的表观电子传递效率与不同深度土壤温度显著相关，增温组表观电子传递效率与20 cm深度土壤电导率显著相关；互花米草对照组叶片的非光化学猝灭系数和表观电子传递效率与20 cm深度土壤含水率、电导率和温度显著相关，增温组表观电子传递效率与10 cm深度土壤温度显著相关，对照组和增温组实际光化学量子效率都与光照强度显著相关；在增温条件下，芦苇PSⅡ反应中心活性和热稳定性降低，同化大气CO2的能力(固碳能力)相较于互花米草处于劣势；在增温条件下，土壤水盐因子对芦苇光合作用过程的影响增强，对互花米草则相反。更多还原

【Abstract】 This study examined how the chlorophyll fluorescence parameters of Phragmites australis and Spartina alterniflora and the environmental factors respond to simulated warming. Taking wetlands vegetated by Phragmites australis and Spartina alterniflora in the Yancheng coast of Jiangsu province as research sites,the author constructed warming observation stations in Phragmites australis and Spartina alterniflora wetlands respectively to determine the responses of stimulated warming on chlorophyll fluorescence parameters and their relationships with environmental parameters. The result showed warming substantially decreased the photochemical efficiency, non-photochemical quenching coefficient, and apparent electron transport rate of Phragmites australis, but increased these parameters of Spartina alterniflora except non-photochemical quenching coefficient. Warming changed the significant correlation between the apparent electron transport rate of Phragmites australis and soil temperature at different depths to that between the apparent electron transport rate of Phragmites australis and soil conductivity at 20 cm, it also changed the significant correlation between the non-photochemical quenching coefficient and apparent electron transport rate of Spartina alterniflora and moisture content, conductivity and temperature of 20 cm soil to that between the non-photochemical quenching coefficient and apparent electron transport rate of Spartina alterniflora and 10 cm soil temperature,and the photochemical efficiency of Spartina alterniflora was significantly correlated with light intensity at both control and warming plots. In summary, warming reduced the activity and thermal stability of the PSⅡreaction center of Phragmites australis, resulted in a reduction in the rate of assimilating atmospheric CO2that determines carbon sequestration capacity compared with that of Spartina alterniflora. Remarkably, warming enhanced the effect of soil moisture content and conductivity on the photosynthetic processes of Phragmites australis, while opposite effect on Spartina alterniflora.更多还原