两种棕榈藤光合日变化及其与环境因子的关系研究  

A Study of Diurnal Variations in Photosynthetic Activity and Its Relationship with Environmental Factors for Two Species of Rattans

作　　者：官凤英[1] 范少辉[1] 刘亚迪[1] 彭颖[1] 邓旺华[1] 

机构地区：[1]国际竹藤网络中心竹藤科学与技术重点实验室生物资源利用科学研究院,北京100102

出　　处：《世界竹藤通讯》2010年第4期1-6,共6页World Bamboo and Rattan

基　　金：林业科学技术推广项目"棕榈藤种质资源培育及利用技术推广与示范"([2005]86);国际竹藤网络中心科研专项"优质棕榈藤苗期生长及光合作用研究"(06/07-B18)

摘　　要：利用LI-6400光合仪测定了盈江省藤和小省藤的光合特征参数,探讨了两种棕榈藤光合日变化规律,并结合环境因子分析影响净光合速率(Pn)的主要因素,研究结果表明:(1)盈江省藤净光合速率Pn和蒸腾速率Tr日变化曲线均呈"双峰"型,存在"午休"现象;小省藤Pn值低,波动小,日变化呈"双峰"曲线趋势,Tr日变化曲线呈"单峰"型。(2)小省藤光合"午休"时间是12:00,盈江省藤的光合"午休"时间在下午14:00,比小省藤推迟了2h。(3)盈江省藤Pn日变化与RH呈显著正相关(r=0.820*,P<0.05),RH和Gs下降是导致盈江省藤发生光合"午休"的决定因素。小省藤的光合能力较盈江省藤弱,Pn日变化与各环境因子无显著相关性。In the study, the diurnal dynamics of photosynthetic activity in Calamus nambariensis var. yingjiangensis and Calamus graeilis Roxb. were monitored using portable LI-6400 photosynthesis system in combination with the analysis of the main environmental factors influencing the net photosynthetic rate. The results were summarized as follows： 1） Calamus nambariensis var. yingjiangensis had an obvious bimodal curve of diurnal variation both in Pn and Tr with obvious midday depression of photosynthesis while Calamus graeilis Roxb.had small fluctuations in the bimodal curve of diurnal variation for Pn and unimodal curve for Tr. 2） The midday depression of photosynthesis in Calamus nambariensis var. yingjiangensis was later for two hours than that of Calamus graeilis Roxb.. 3） There was a significantly positive correlation between the diurnal variation in Pn and RH （r=0.820＊,P〈0.05）. The decrease in RH and Gs was the determinant resulting in the midday depression for Calamus nambanensis var. yingjiangensis. There was no significant correlation between the diurnal variation in Pn and environmental impact factors for Calamus graeilis Roxb. which had lower photosynthetic capacity than Calamus nambariensis var, yingjiangensis.

关 键 词：棕榈藤 净光合速率 环境因子 日变化 光合“午休” 

分 类 号：S564.1[农业科学—作物学]