秋干季节与湿润夏季对美洲黑杨“中嘉2”光合作用的影响Effect of Dry Days in Automn and Wet Days in Summer on Photosynthesis of Populus deltoides CL.'Zhongjia 2'
杨维平;吴瑞云;戴月;
摘要(Abstract)：
[目的]对美洲黑杨杂交品种"中嘉2"光合作用秋干季节与湿润季节变化规律进行系统性比较研究,探索其光合作用的规律及其光合效率午间降低的机制,为杨树抗旱育种提供理论依据。[方法]在自然条件下对中南地区的优良杨树品种-中嘉2在湿润夏季和秋干季节的光合特征进行了观测分析。[结果]在秋季的干旱胁迫状态,气孔及非气孔限制的共同作用导致秋干季节的净光合速率(Pn)显著低于湿润夏季。秋干季节的光合"午休"现象与气孔无关,此时光合作用受非气孔因素限制,即低湿、强光条件下杨树叶片发生了明显的光抑制或光呼吸。单个生态生理因子对净光合速率影响曲线呈显著水平极高的二项式关系,湿润季节与秋干季节典型晴天净光合速率的最优多元回归模型为:Y=-3.2479-0.0016X1+213.5016X3+0.2829X5-0.0097X7(X1-PAR,X3-CE,X5-Tleaf,X7-Ca)。[结论]羧化效率(CE)、叶面温度(Tleaf)是影响Pn的主导生理生态因子。
关键词(KeyWords)： 光合生理生态;秋干季节;湿润夏季;美洲黑杨“中嘉2”
基金项目(Foundation): 广西自然科学基金(桂科自0542033)
作者(Author): 杨维平;吴瑞云;戴月;
Email:
DOI: 10.13989/j.cnki.0517-6611.2008.13.115
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