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武夷四照花光合生理生态特性的研究
郭振,黄成林
0
(安徽农业大学林学与园林学院,合肥230036)
摘要:
对武夷四照花的光合生理特性进行研究,结果表明,其净光合速率在春、夏、秋3个季节均呈现双峰曲线形,光补偿点为46.10 μmol·m-2·s-1,光饱和点为500 μmol·m-2·s-1,属于阴性植物,不耐阳光直射,其生长需要一定的散射光;通径分析表明气孔导度对春、夏、秋3个季节的净光合速率影响最为明显, 其次为相对湿度和蒸腾速率;叶片的光能利用率与气孔导度和相对湿度呈正相关。因此,为了提高光能利用率,应增加空气的相对湿度。
关键词:  武夷四照花  净光合速率  光合生理特性  光能利用率
DOI:
投稿时间:2012-12-04
基金项目:“十二五”国家“林业生态科技工程” 项目(2011BAD38B0702)资助。
Characteristics of photosynthetic physiology and ecology of Dendrobenthamia angustata var. wuyishanensis
GUO Zhen,HUANG Cheng-lin
(School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei 230036)
Abstract:
In this paper, the photosynthetic physiological characteristics of Dendrobenthamia?angustata?var. wuyishanensis was studied.The results indicated that the diurnal variation of photosynthetic rate presented a typical double-peak curve type in spring, summer and autumn. The species had the low light compensation point of 46.10 μmol·m-2·s-1, and its light saturation point was 500 μmol·m-2·s-1. Based on the analysis, the species could be identified as a darksome cover with shade tolerance and intolerant to direct sunlight. The path coefficient analysis was used to describe the importance of the different factors on the net photosynthetic rate in growing seasons. The results showed that the stomatal conductance affected the net photosynthetic rates of Dendrobenthamia?angustata?var. wuyishanensis in spring, summer, autumn obviously, followed by relative humidity and transpiration rate. Blades of light energy utilization rate and stomatal conductance and relative humidity were positively correlated based on both correlation analysis and path coefficient analysis. In order to improve the light energy utilization, the air relative humidity should be increased.
Key words:  Dendrobenthamia angustata var. wuyishanensis  net photosynthetic rate  photosynthetic physiological character  light energy utilization

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