干旱区研究

干旱区研究 ›› 2016, Vol. 33 ›› Issue (5): 1098-1103.doi: 10.13866/j.azr.2016.05.25

• 植物生理 • 上一篇    下一篇

灰叶胡杨异形叶的类型及其时空特征

刘帅飞1,2, 焦培培1,2, 李志军1,2   

  1. 1.新疆生产建设兵团塔里木盆地生物资源保护利用重点实验室,新疆 阿拉尔 843300;
    2.塔里木大学植物科学学院,新疆 阿拉尔 843300
  • 收稿日期:2015-09-10 修回日期:2015-11-12 出版日期:2016-09-15 发布日期:2016-09-28
  • 作者简介:刘帅飞(1990-),男,在读硕士,从事干旱区生物多样性及其保育研究. E-mail: liushuaifei12@126.com
  • 基金资助:
    国家自然科学基金(31060026,31460042,U1303101);塔里木大学校长基金项目(TDZKSS201419)资助

Diversifolious Types and Spatiotemporal Characteristics of Populus pruinosa Schrenk

LIU Shuai-fei1,2, JIAO Pei-pei1,2, LI Zhi-jun1,2   

  1. 1. Key Laboratory of Conservation and Utilization of Bioresources in the Tarim Basin,Xinjiang Corps of Production and Construction,Aral 843300,Xinjiang,China;
    2. College of Plant Sciences,Tarim University,Aral 843300,Xinjiang,China
  • Received:2015-09-10 Revised:2015-11-12 Published:2016-09-15 Online:2016-09-28

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摘要： 为了探讨灰叶胡杨个体发育过程中异形叶发生和垂直空间分布随径级的变化规律及其相互间的关系,在塔里木盆地西北缘调查同一立地条件下,各径级灰叶胡杨异形叶的类型及空间分布规律。结果显示:① 阔椭圆形叶、圆形叶和阔卵形叶有规律地出现在不同的径级阶段,其中阔椭圆形叶出现在2～20径级阶段,圆形叶和阔卵形叶分别从4、6径级开始出现,它们在树冠上的出现均始于树冠的顶部,异形叶的出现与个体发育阶段相关;② 3种异形叶出现频率及垂直空间分布区占冠高的比例,随径级变化而发生动态的消长变化,其中,阔椭圆形叶出现频率及垂直空间分布区占冠高的比例,随径级增加逐渐减小,圆形叶出现频率及垂直空间分布区占冠高的比例,随径级增加先增大后减小,阔卵形叶出现频率及垂直空间分布区占冠高的比例,随径级增加则逐渐增大;③ 阔椭圆形叶在树冠垂直空间的出现频率及垂直空间分布占冠高的比例,均与胸径、树高呈极显著负相关,圆形叶仅出现频率与胸径、树高呈极显著正相关,阔卵形叶出现频率及垂直空间分布区占冠高的比例,均与胸径、树高呈极显著正相关。说明各类异形叶出现频率及时空变化与胡杨个体发育阶段密切相关,灰叶胡杨的异形叶性是由个体发育阶段决定的,灰叶胡杨在不同发育阶段出现的异形叶是其生长适应策略。

关键词: 灰叶胡杨(Populus pruinosa), 异形叶性, 径级, 时空变化

Abstract: In this study,the diversifolious types and spatial distribution of Populus pruinosa Schrenk under the same site conditions in the northwestern marginal zone of the Tarim Basin were researched so as to reveal the growing and vertical distribution of heterophylls of P.pruinosa with the variation of diameter class stage as well as their relationship. The results are as follows: ① Broad oval leaves,round leaves and broad ovate leaves turned regularly and grew at different diameter class stages when broad oval leaves grew at 2-20 diameter class stage,while round leaves and broad ovate leaves grew from 4 and 6 diameter class stages,and they grew from the top canopy. Growth of heterophylls was associated with the individual developmental stages; ② The growing frequencies and the proportions of heterophylls at the vertical spatial distribution areas in the canopy height changed dynamically with the change of diameter class stage,in which the growing frequency and the proportion of broad oval leaves at the vertical spatial distribution area in the canopy height were gradually decreased with the increase of diameter class stage,those of round leaves were increased at first and then decreased with the increase of diameter class stage,and those of broad ovate leaves were gradually increased with the increase of diameter class stage; ③ There were the extremely significant negative correlations between the growing frequency in vertical space of canopy and the proportion of vertical spatial distribution in canopy height with the diameter at breast height and the tree height for broad oval leaves,and the extremely significant positive ones for both round leaves and broad ovate leaves. These revealed that the growing frequency and spatiotemporal variation of various heterophylls were closely related to the ontogenetic stage of P.pruinosa.

Key words: Populus pruinosa, heterophylly, diameter class stage, spatiotemporal variation