天津开发区毛泡桐叶片光合作用年变化动态研究  

Dynamic Research of the Annual Photosynthesis Variation Regularity of Paulownia tomentosa Steud in Tianjin Development Zone

作　　者：蒲光兰[1] 袁大刚[1,2] 刘世全[1] 张金龙[2] 

机构地区：[1]四川农业大学,四川雅安625014 [2]天津泰达生态园林发展有限公司,天津300457

出　　处：《内江师范学院学报》2009年第4期56-59,共4页Journal of Neijiang Normal University

基　　金：天津市建委项目(2006B102)

摘　　要：为了系统了解毛泡桐光合作用的动态变化规律,以开发区行道树毛泡桐作为研究对象,对该叶片光合作用年变化规律进行研究.结果表明:毛泡桐叶片净光合速率变化呈近"W"型,3个峰值分别出现在5,8,10月;叶表面温度呈现出先上升后下降的趋势,其峰值出现在8月;蒸腾速率和气孔导度均呈下降趋势;环境光合有效辐射呈波浪式下降,有2个峰,分别出现在6月和8月;水分利用效率在5～9月期间趋于稳定,10月其值急剧上升,出现一峰值.相关分析结果表明,气孔导度、蒸腾速率均与净光合速率显著相关,叶表面温度与水分利用率相关性极显著.The research is carried out to gain a systematic knowledge about the dynamic photosynthesis variation regularity of Paulownia tomentosa Steud with its objects of study picked from the street trees-Paulowmia tomentosa Steud -of the development zone. The results turn out to be as follows： （1） The seasonal variation curve of photosynthesis on leaves takes the shape of ＂W＂, with the 3 peaks appearing respectivly in May, August and Oetober. The surface temperature on leaves takes an upward trend in the earlier period while a downward one in the later period with the temperature peak observed in August; （2） The values of transpiration rate and stomatal conductance take a downward trend; （3） Photosynthesis active radiation（PAR） takes a down trend, with 2 peaks observed in June and August respectively; （4）Water use efficiency remains stable from May to September, and then, goes up abruptly to a peak in October. The correlation analysis reveals a significant correlation not only between Gs and Pn, but also between Tr and Pn. ,and correlation between water use efficiency and Tsur also reaches a very significant level.

关 键 词：天津开发区 毛泡桐 光合作用 

分 类 号：Q945.11[生物学—植物学]