摘要
选择两个速生的（群众杨４４和欧美杨２５／８６）和两个慢生的（小叶杨和欧美杨２８／８６）杨树无性系，在水培和生长箱控制条件下，测定不同温度和相对湿度对ＣＯ２短时间的响应。结果表明：温度和湿度会不同程度地影响杨树对ＣＯ２短时间响应；净光合速率和水分利用效率与细胞间隙ＣＯ２浓度之间呈显著的正相关；ＣＯ２补偿点和羧化效率受温度、湿度影响明显；在大部分处理中气孔导度和蒸腾强度与细胞间隙ＣＯ２浓度之间相关不显著。由所得结果推知，温度和湿度对短时间ＣＯ２响应可能是通过ＣＯ２固定。
Instantaneous responses of the rate of net photosynthesis ( P n ),stomata conductance ( CS ),water use efficiency ( WUE ),CO 2 compensation point ( Γ ),carboxylation efficiency ( CE ),and transpiration ( TR ) to CO 2,were monitored at different temperature (25°,30°,35℃) and humidity (RH 30,50,70%) regimes,using leaves of water cultivated plants of four selected poplar clones: Populus simonii (Clone A), P.euramericana 28/86 (Clone B), P.popularis 44 (Clone C),and P.euromericana 25/86 (Clone D).It was shown that temperature and relative humidity could affect the instantaneous response to CO 2 in P n,Γ and WUE .There were significantly positive correlation between the P n ,or the WUE ,and intercellular CO 2 ( C i ).The CS adn TR ,however,were not significantly related to the C i in most of treatments.It may be inferred that the influences of temperature and relative humidity on the responses were mediated by modifying the biochemical process underlying the photosynthesis.
出处
《林业科学研究》
CSCD
北大核心
1996年第4期368-375,共8页
Forest Research
关键词
杨树
无性系
温度
湿度
光合作用
poplar clones, CO 2, temperature, humidity, photosynthesis
