摘要
利用LI-6400便携式光合测定系统测定四棱豆现蕾期及主茎不同节位叶片的叶绿素含量和净光合速率,并通过回归分析和相关分析研究净光合速率与主要生理、生态因子的关系.结果表明,四棱豆主茎不同节位叶片的叶绿素含量和净光合速率随着节位的上升而下降;净光合速率日变化曲线呈双峰状,有典型的光合"午休"现象;影响四棱豆净光合速率日变化的主要生态因子是叶片温度和空气相对湿度,主要生理因子是蒸腾速率.
Chlorophyll contents and net photosynthetic rate（Pn） of leaves seated in different knots of the main stem of winged bean and the diurnal photosynthetic characteristics were determined in budding stage by LI-6400 portable photosynthesis system.The relationship between net photosynthetic rate（Pn） and its physio-ecological factors,including PAR,RH,Tl,Gs,Ci and Tr,were clarified by regression analysis and correlation analysis.The results showed that chlorophyll contents and Pn of leaves seated in different knots of winged bean were different,that was,with the knots increasing,the chlorophyll contents and Pn of the leaves declined.The diurnal change trend of Pn showed a double peak curve,presenting a typical phenomenon of ＂photosynthesis midday depression＂.Among the ecological factors,Tl and RH were the key two ones that influenced the variations of Pn,and Tr was the major physiological factor that influenced the variations of Pn.
出处
《湖南农业大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第3期304-308,共5页
Journal of Hunan Agricultural University(Natural Sciences)
基金
湖南省科技计划项目(2009FJ3105)
怀化学院科研项目(HHUY2008-10)
关键词
四棱豆
光合特性
生理生态因子
winged bean
photosynthetic characteristics
physio-ecological factors
