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竹柏2种颜色叶片的光合特性研究
闾邱杰, 曹景怡
广州怡境景观设计有限公司, 广州 510600
摘要:  为了解竹柏(Podocarpus nagi)的光合特性,以3 a生全绿叶和花叶竹柏为材料,测定其光合色素含量和气体交换参数。结果表明,全绿叶竹柏叶片的叶绿素a、叶绿素b、类胡萝卜素、叶绿素a+b、叶绿素a/b和叶绿素a+b/类胡萝卜素均显著高于花叶竹柏;全绿叶竹柏叶片的初始量子效率、最大光合速率和暗呼吸速率均显著高于花叶,而光饱和点和光补偿点均显著低于花叶;全绿叶竹柏叶片的初始羧化效率、光合速率、CO2饱和点和光呼吸速率均高于花叶,而CO2补偿点低于花叶。2种颜色叶片的气孔导度、蒸腾速率和水分利用效率均随着光合有效辐射的增大而增大,且均表现为全绿叶>花叶,而胞间CO2浓度则相反,表现为花叶>全绿叶。因此,全绿叶竹柏利用弱光的能力强于花叶竹柏,而花叶竹柏利用强光的能力更强,在园林绿化配置中,可根据2种颜色叶片的光合特性合理配置。
关键词:  竹柏  光合色素  光合气体交换参数  光合特性
DOI:10.11926/jtsb.4134
分类号:
基金项目:中央财政林业科技推广示范项目([2013]15号)资助
Photosynthetic Characteristics of Two Color Leaves of Podocarpus nagi
Lü Qiu-jie, CAO Jing-yi
Guangzhou Greenview Landscape Design Limited CO., Guangzhou 510000, China
Abstract:  In order to understand the photosynthetic characteristics of Podocarpus nagi, the photosynthetic pigment content and gas exchange parameters of green and striped leaves of 3-year-old P. nagi seedlings were measured. The results showed that the chlorophyll (Chl) a, Chl b, carotenoid (Car), Chl a+b, Chl a/b and Chl a+b/Car in green leaves were significantly higher than those in striped leaves. The initial quantum efficiency, maximum photosynthetic rate and dark respiration rate in green leaves were significantly higher than those in striped leaves, and the light saturation point and light compensation point were significantly lower than those in striped leaves (P<0.05). The initial carboxylation efficiency, photosynthetic capacity, CO2 saturation point and photorespiration rate of green leaves were higher than those of striped leaf, and CO2 compensation point of green leaves was lower than that of striped leaves. The stomatal conductance, transpiration rate and water use efficiency increased with the increment of photosynthetic active radiation with the order of green leaf>striped leaf, while the intercellular CO2 concentration had opposite trend with striped leaf>green leaf. So, it could be rationally planted according to the photosynthetic characteristics of two different color leaves according to the different phytosynthetic characteristics of two color leaves of P. nagi, which green leaf had strong ability to use weak light and striped leaf had strong ability to use stronger light.
Key words:  Podocarpus nagi  Photosynthetic pigment  Photosynthetic gas exchange parameter  Photosynthetic characteristics

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