5种四倍体泡桐生长特性的研究

以2年生5种四倍体泡桐为材料,研究其光合作用、材积生长量、接干长度、比叶重（ SLW）等指标间的差异。结果表明,5种四倍体泡桐叶片的净光合速率（ Pn）、气孔导度（ Gs）、蒸腾速率（ Tr）、胞间CO2浓度（ Ci）光合因子的日变化规律相同。9月份叶片的Pn、 Gs、 Tr、 Ci日变化为单峰曲线,四倍体豫杂一号泡桐（ TF4）的最大净光合速率高于其余4个种。此外,四倍体毛泡桐（ T4）的树高生长量和接干高增长量、 TF4的胸径生长量和比叶重增长量、四倍体南方泡桐（ A4）的材积增长量最大。5种四倍体泡桐的树高、胸径、接干、材积的相关性表明,材积与胸径呈正相关关系,相关性显著;树高与比叶重呈正相关关系,但相关性不显著。

The Growth Characteristics of 5 Different Varieties of Tetraploid Paulownia

Taking 5 different varieties of 2-year-old tetraploid Paulownia as materials, the variations of its photo-synthesis, wood volume , stem-join height and specific leaf weight （SLW） were studied.The results showed that the diurnal variation of net photosynthetic rate （ Pn） , stomatal conductance （ Gs） , transpiration rate （ Tr） and in-tercellular CO 2 concentration （ Ci） of these five species of tetraploid Paulownia leaf was the same.Diurnal variation of Pn, Gs, Tr, Ci was single peak in September and the largest Pn was tetraploid Paulownia tomentosa ×Paulow-nia fortunei （TF4） .In addition, high-growth and stem-join height of tetraploid Paulownia tomentosa （T4）, the DBH growth and SLW increment of TF 4 , stem volume increment of tetraploid Paulownia australis （ A4 ） were lar-gest.Relativity analysis of tree height , DBH, stem-join, wood volume of these 5 varieties of tetraploid Paulownia showed that there was significant positive correlation between wood volume and DBH , positive correlation （ not sig-nificiant ） between tree height and SLW.