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当前位置: 首页 > 文章 > 西南喀斯特典型树种光合特性的季节变化及主要影响因子 农业现代化研究 2015 (5) 890-894
Position: Home > Articles > Seasonal dynamics of photosynthesis and the underlying regulating factors for typical species in Southwest Karst Research of Agricultural Modernization 2015 (5) 890-894

西南喀斯特典型树种光合特性的季节变化及主要影响因子

作  者：
付威波;宋敏;彭晚霞;杨钙仁;杜虎;文丽;李莎莎
单  位：
广西大学林学院;中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室
关键词：
光合生理;季节变化;西南喀斯特;影响因子;滇南安息香;女贞;岩樟
摘  要：
为了解喀斯特典型植物光合作用季节变化特征,应用LI-6400便携式光合作用测定系统,对滇南安息香(Styrax benzoinoides Craib)、女贞(Ligustrum lucidum)和岩樟(Cinnamomum saxatile)3种喀斯特典型植物在自然生境中的光合季节动态及主要影响因子进行研究。结果表明:女贞和岩樟的光合速率季节变化表现为4月、7月较高而1月、10月低,滇南安息香的光合速率季节变化则不明显;3种植物都出现了光合"午休"现象,但不同树种的变化曲线不同;不同季节影响3种植物的净光合速率(Pn)的因子不同:1月和10月,3种植物共同的主要影响因子为光强(PAR)和蒸腾速率(Tr),4月3种植物的主要影响因子各不相同,胞间CO2含量(Ci)和光强(PAR)是影响女贞的主要影响因子,光强(PAR)和蒸腾速率(Tr)是影响岩樟的主要影响因子,而各因子对滇南安息香的影响不显著。7月影响3种植物净光合速率的因子主要是气孔导度(Gs)和胞间CO2含量(Ci)。光强是不同季节影响3种植物净光合速率最为主要的因子。通过对3种植物光合作用季节变化特征分析,女贞和岩樟能较好的与西南喀斯特环境相适应,而滇南安息香对西南喀斯特环境适应性较差。
译  名：
Seasonal dynamics of photosynthesis and the underlying regulating factors for typical species in Southwest Karst
作  者：
FU Wei-bo;SONG Min;PENG Wan-xia;YANG Gai-ren;DU Hu;WEN Li;LI Sha-sha;College of Forestry, Guangxi University;Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences;Huanjiang Observation and Research Station of Karst Ecosystem, Chinese Academy of Sciences;Department of Grass Science, College of Agriculture, Hunan Agricultural University;
关键词：
photosynthetic physiology;;seasonal dynamics;;Southwest Karst;;influencing factors;;Styrax benzoinoides Craib;;Ligustrum lucidum;;Cinnamomum saxatile
摘  要：
A study was conducted to investigate the seasonal dynamics of photosynthesis and the underlying regulating factors for three typical species, i.e., Styrax benzoinoides Craib, Ligustrum lucidum, and Cinnamomum saxatile, in Southwest Karst, China. Photosynthesis was measured using LI-6400 portable pothosynthesis system. Net photosynthetic rates(Pn) of Ligustrum lucidum and Cinnamomum saxatile were higher in April and July, while lower in January and October, while a clear seasonal pattern of Pn for Styrax benzoinoides Craib was not observed. All the three species were found to exhibit the phenomenon of ‘ noon break', but each had different curves. Different factors affected the Pn of the three species in different season. The photosynthetic active radiation(PAR) and transpiration rate(Tr) were the main factors in January and October. The factors regulating Pn for the three species varied in April, with the intercellular CO2concentration(Ci) and PAR being the main factors for Ligustrum lucidum, and PAR and Tr being the main factors for Cinnamomum saxatile. Netherless the effects of all the factor on Styrax benzoinoides Craib was not significant. In July the main factors were stomata conductance(Gs) and Ci. PAR was the main factor affecting Pn of the three species in different season. We concluded that Ligustrum lucidum, and Cinnamomum saxatile could be more adaptive to the environments of Karst, while Styrax benzoinoides Craib was less adaptive to the environments of Karst in the Southwest China.

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