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 8X0.0282 .(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.