曼地亚红豆杉蒸腾速率日变化及因子分析

Diurnal variation of transpiration rate of Taxus media cv.Hichksii and factor analysis

应用LI— 1 60 0稳态气孔计对曼地亚红豆杉(Taxusmediacv .Hicksii)叶片的蒸腾速率、气孔阻力和几个生态因子的日变化同步进行了测定。并采用多元回归分析和灰色关联度分析的方法探讨了曼地亚红豆杉叶片蒸腾速率与影响因子的关系 ,结果表明 :影响曼地亚红豆杉蒸腾速率的主要因子是叶温、气温 ;其次是光量子通量密度、空气相对湿度、气孔阻力。灰色关联度分析与多元回归分析结论基本一致。对曼地亚红豆杉叶片蒸腾速率与气孔阻力的相关关系分析表明 :蒸腾速率和气孔阻力间属非线性关系 ,其方程为 :Tr =1 2 .789- 1 3.41 9lgRs(R2 =0 .971 7)

Diurnal variation of transpiration rate (Tr) and stomatal resistance (Rs) of Taxus media cv.Hicksii and some ecological factors were determined by using LI—1600 stable porometer and the relationship between transpiration rate(Tr) and influencing factors was discussed by the methods of multiple regression analysis and grey relation grades analysis, The results indicated that the major influencing factors were air temperature(Ta) and leaf temperature(Tl), the next were photon flux density(PFD), air relative humidity(Rh) and stomatal resistance(Rs). The conclusions of multiple regression analysis and grey relation grades analysis were unanimous. According to the analysis of the relationship between Tr and Rs, there was non-linear relationship. The equation was following: Tr=12.789-13.419 lg Rs(R2=0.971 7).