采用Li-6400便携式光合测定仪，在春季对武夷四照花的光合日变化进行测定，通过相关分析和通径分析，得出净光合速率与影响因子之间的关系，并拟合光响应曲线，利用多元回归分析建立相应的多元方程。结果表明：武夷四照花叶片Pn的日变化呈双峰曲线型，具有典型的光合“午睡”现象；气孔导度和相对湿度是直接影响武夷四照花叶片Pn的主要因子；武夷四照花的光补偿点为26.02μmol photons·m-2·s-1，光饱和点为670.01μmol photons·m-2·s-1，补偿点、饱和点均较低，属于耐阴植物。%Using Li-6400 portable photosynthetic apparatus,photosynthesis diurnal variation of Dendroben⁃thamia angustata var.wuyishanensis in spring was determined. Through correlation analysis and path analy⁃sis,this paper assessed the relationship between net photosynthetic rate(Pn)and impact factors and light re⁃sponse curve fitting. Multiple regression analysis is used to establish the corresponding equation. The re⁃sults showed that:the diurnal variation of Pn had the double-peak curve,the typical photosynthetic“nap”phe⁃nomenon;relative humidity and stomatal conductance were the most important directfactors to influence the changes of Pn. The light saturation point was 26.02μmol photons · m-2 · s-1and the light saturation point was 670.01μmol photons·m-2·s-1,so D.angustata var.wuyishanensis is shade plants.
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