绿竹笋期叶片生理生化特性研究

绿竹 (Dendrocalamopsisoldhamii)属禾本科竹亚科绿竹属 ,原产我国 ,集中分布浙江南部、台湾、福建及广西、广东等省 (区 )。在浙江、台湾、福建三省普遍栽培 ,是亚热带地区优良速生的笋材两用的丛生竹种之一。绿竹笋味鲜美 ,清凉解暑 ,同时具有降压、降脂、增强消化系统功能的作用 ,是夏秋两季深受群众喜爱的美味佳肴。绿竹竹材易降解 ,是应用前景广阔的造纸原料。近年来 ,以笋用林为主要经营目的的绿竹林发展很快 ,并取得不少的经验 (张文燕等 ,1 999;郑文汉等 ,1 997;董建文 ,2 0 0 0 )。叶片作为最主要的同化器官在竹林生长发育过程中起着重要作用 ,研究竹叶片生理生化特性 ,揭示叶片生长发育规律 ,对指导竹林栽培具有重要意义。当前对竹子叶片生理生化特性的研究已有过不少报道 ,如毛竹(Phyllostachysheterocyclacv .pubescens) (郑郁善等 ,1 998;黄启胜等 ,1 989)、麻竹 (Dendrocalamuslatiflorus)(邱尔发等 ,2 0 0 1 ;2 0 0 2 )、雷竹 (Phyllostachyspraecoxf.pre...

STUDIES ON THE PHYSIOLOGICAL AND BIOCHEMICAL CHARACTERISTICS OF LEAVES OF DENDROCALAMOPSIS OLDHAMII DURING SHOOT GROWING

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.