短穗竹夏季光合特性及其影响因子研究  

Photosynthetic Characteristics of Brachystachyum densiflorum and Its Impact Factors in Summer

作　　者：吴莹[1] 荣俊冬[2] 郑晶晶[2] 吴佳木 陈凌艳[1] 郑郁善[1,2] 

机构地区：[1]福建农林大学艺术学院园林学院,福州350002 [2]福建农林大学林学院,福州350002

出　　处：《中国农学通报》2014年第13期40-44,共5页Chinese Agricultural Science Bulletin

基　　金：福建省重点科技项目"福建特有珍稀竹种质资源保存评价及快繁技术研究与应用"(2013N0002)

摘　　要：为了研究中国特有单属种植物短穗竹夏季光和特性及其影响因子,于2013年7月中旬,利用LCpro+SD全自动光合仪,通过对短穗竹净光合速率(Pn)的测定,采用多元逐步分析法,建立了Pn与生理生态因子关系模型。结果表明:短穗竹夏季Pn日变化呈"双峰"曲线,具有典型的"午休"现象;光补偿点(LCP)和光饱和点(LSP),分别约为40.90μmol/(m2·s)和979.77μmol/(m2·s),表光量子效率(AQY)约为0.016;夏季影响短穗竹Pn的主要生理生态因子有:蒸腾速率(Tr)、胞间CO2浓度(Ci)、光合有效辐射(PAR)。通过研究表明,短穗竹表现出较高的LCP和较低的LSP、AQY,说明其对光的适应性较窄,弱光下光能利用率较低。In order to study photosynthetic characteristics of Chinese endemic single species Brachystachyumdensiflorum（Rendle） Keng in summer and its influential factors, LCpro ＋ SD automatic photosyntheticapparatus was used to test net photosynthesis（Pn） and multivariate step-wise analysis method was used toestablish the relationship model between Pn and physiological and ecological factors. The results showed thatdaily variation of Pnof Brachystachyum densiflorum（Rendle） Keng in summer was like a curve of＂twin peaks＂,known as typical＂noon break＂; the light complementary point（LCP） and light saturated point（LSP） were40.90 μmol/（m2·s） and 979.77 μmol/（m2·s）, respecitvely, and apparent quantum yields（AQY） was 0.016. Theinfluential physiological and ecological factors to affect Pn of Brachystachyum densiflorum（Rendle） Keng insummer mainly involve transpiration rate（Tr）, intercellular CO2 concentration（Ci） and photosynthetic activeradiation（PAR）. The research showed that Brachystachyum densiflorum（Rendle） Keng was characterized byhigher LCP and lower LSP and AQY, indicating that its light adaptability was narrow, with low light energyutilization rate under weak light.

关 键 词：短穗竹 光合特性 生理因子 生态因子 夏季 

分 类 号：S795[农业科学—林木遗传育种]