Abstract:

Specific weight, photosynthetic rate, respiratory rate and the N, P, K content were studied in different parts of leaves of Dendrocalamopsis oldhamii in one-year-old, two-year-old and three-year-old during various shoot growing. The results showed that there were obvious differences in the characteristics in the various leaf position of the three-year-old D. oldhamii during various shoot growing. The specific weight of leaves in prosperous stage of shoot growing was higher than that in initial stage and last stage, and presented the tendency of decreasing with D. oldhamii aging and increasing with the leaf position rising. The net photosynthetic rate in prosperous stage were higher than those in initial stage, while the light and the dark respiratory rate in initial stage were higher than those in prosperous stage,but they all presented great variability in the various age and the various leaf position. The N, P, K contents decreased from initial stage to prosperous stage during the shooting period, and the N content was one-year-old>two-year-old>three-year-old, which in the middle height layers was the highest. The P,K content presented the tendency of decreasing with the height rising and increasing with D. oldhamii aging.

Key words: Dendrocalamopsis oldhamii, Shooting period, Leaves, Physiological and biochemical characteristics