两种棕榈藤光合日变化及其与环境因子的关系研究.pdf

世界竹藤通讯 学术园地 Academic Field WORLD BAMBOO AND RATTAN 两种棕 藤光合日变化及其与环境因子的关系研究 榈 * 官凤英 范少辉 刘亚迪 彭颖 邓旺华 (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) 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*,P0.05)，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。 关键词: 棕榈藤；净光合速率；环境因子；日变化；光合“午休” A Study of Diurnal Variations in Photosynthetic Activity and Its Relationship with Environmental Factors for Two Species of Rattans Guan Fengying, Fan Shaohui*, Liu Yadi, Peng ying, Deng Wanghua (International Centre of Bamboo and Rattan, The Key Laboratory for Bamboo and Rattan, Academy of Bioresources Utilization, Beijing 100102) Abstract: 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 infl uencing 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 fl uctuations 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) Ther