黄山松苗期生长及生理特性研究

在黄山松林天然植被调查分析的基础上 ,大田设置 10 0 %、4 5%、37%、16 % 4种不同透光度的黄山松播种苗区 ,定期测定光合速率、呼吸速率、蒸腾速率、各器官生长量及生物量等生理和生长指标。试验结果表明 :(1)光对黄山松苗生长及生理过程有明显影响 ,以全透光苗最为粗壮。光合有效辐射 (即 4 0 0～ 76 0 nm 波段辐射能 )与光合效率的关系最为密切 ,其关系式为 y=19.510 8x0 .0 2 82 。(2 )黄山松苗木水势偏低 ,光补偿点较高 (5.2 6 W· m-2 ) ,水分利用效率高 (3.0 1×10 -3 ) ,且扎根深 ,抗旱性强 ,是亚热带中高山地区水源涵养林适宜树种。

Study on Seedling Growth and Physiological Characteristics of Taiwan Pine

On the basis of investigating natural vegetation of Taiwan pine(Pinus taiwanensis) forest, four Taiwan pine seedling plots with transmissivities of 100%, 45%, 37% and 16% were established to measure regularly the photosynthetic ratio, respiratory ratio, evapotranspiration ratio, increments of organs and biomass. The results showed that:(1) Illumination had significant influence on the growth and physiological process of P. taiwanensis. The seedling with transmissivitiy of 100% was the strongest. There exists a close relationship between photosynthetic effective radiation and photosynthetic effectiveness, which follows the equation of Y=19.510 8X^0.0282 .(2) The P. taiwanensis seedlings had the characteristics of low water potential, high photo compensation point(5.26 W·m^-2), high water utilization ratio(3.01×10^-3), deep rooting and strong drought tolerance. It is proved that this species is suitable to be planted as water conservation forest in mountainous area of subtropic region.