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中国沙漠 ›› 2023, Vol. 43 ›› Issue (1): 116-127.DOI: 10.7522/j.issn.1000-694X.2022.00091

• • 上一篇    

胡杨( Populus euphratica )枝叶异速生长关系随发育阶段及冠层高度变化的性别差异

翟军团(), 陈向向, 李秀, 张山河, 韩晓莉, 李志军()   

  1. 塔里木大学 塔里木盆地生物资源保护利用兵团重点实验室/生命科学与技术学院/胡杨研究中心,新疆 阿拉尔 843300
  • 收稿日期:2022-04-14 修回日期:2022-05-31 出版日期:2023-01-20 发布日期:2023-01-17
  • 通讯作者: 李志军
  • 作者简介:李志军(E-mail: lizhijun0202@126.com
    翟军团(1994—),男,新疆阿拉尔人,博士研究生,主要从事干旱区生物多样性保育研究。E-mail: zhaijuntuan2022@163.com
  • 基金资助:
    国家自然科学基金项目(U1803231);新疆生产建设兵团重点领域创新团队建设计划项目(2018CB003);中央引导地方科技发展资金项目“塔里木盆地荒漠河岸林生态系统野外科学观测研究站建设项目”

Sexual dimorphism in allometric growth relationship between branch and leaf traits of Populus euphratica with changes in developmental stage and canopy height

Juntuan Zhai(), Xiangxiang Chen, Xiu Li, Shanhe Zhang, Xiaoli Han, Zhijun Li()   

  1. Key Laboratory of Biological Resource Protection and Utilization of Tarim Basin / College of Life Science and Technology / Desert Poplar Research Center,Tarim University,Alar 843300,Xinjiang,China
  • Received:2022-04-14 Revised:2022-05-31 Online:2023-01-20 Published:2023-01-17
  • Contact: Zhijun Li

摘要:

胡杨(Populus euphratica)具有异形叶性,在维持干旱荒漠区生态平衡中发挥着不可代替的作用。研究枝、叶形态和生物量间的关系,探讨胡杨资源分配的策略具有重要意义。通过测定不同径阶胡杨雌雄株当年生枝、叶形态性状及生物量,研究在不同发育阶段和不同冠层高度下胡杨雌雄株枝、叶间的生长关系。结果表明:随径阶的增加,雌雄株叶片数呈减小趋势,枝条粗、叶柄长、叶柄粗、叶面积、叶片数、枝干重和每枝叶干重呈增加趋势;不同径阶胡杨雌雄株枝、叶形态间存在异速生长关系,随着径阶的变化,雄株枝叶形态转变较快,而雌株枝叶间的生物量转化效率更高;不同冠层高度胡杨雌雄株枝、叶形态间存在异速生长关系,随着冠层高度的变化,雌株枝叶形态转变较快,而雄株生物量转化效率更高。胡杨在高的冠层和成熟的发育阶段可能通过更短更粗的当年生枝条高效地为具有较大叶柄长、叶柄粗、叶面积的叶片提供水分和矿物质元素。

关键词: 胡杨(Populus euphratica), 异速生长, 形态性状, 生物量, 发育阶段

Abstract:

Populus euphratica with heteromorphic leaves plays an irreplaceable role in maintaining the ecological balance in the arid desert area of Northwest China. It is of great significance to study the relationship between branch and leaf morphology and biomass and to explore the strategy of resource allocation for P. euphratica. By measuring the morphological characters and biomass of annual branches and leaves of male and female P. euphratica at different diameter classes, we studied the relationship between male and female branches and leaves of P. euphratica, at different development stages and canopy. The results showed that the number of leaves of male and female plants decreased, and the diameter of branches, petiole length, diameter of the petiole, leaf area, the number of leaves, branch dry weight, and dry weight increased with the increase of diameter class. Further analysis showed that there was an allometric relationship between the branch and leaf morphology of male and female P. euphratica with different diameter classes. The morphological transformation speed between branches and leaves was faster in males, while the biomass conversion efficiency between the branches and leaves was higher in females. Also, there was an allometric growth relationship between the branches and leaf morphology of male and female P. euphratica at different canopy heights. With the change in canopy height, the transformation speed between the branches and leaves of female plants was faster, while the biomass transformation efficiency of male plants was higher. There was an allometric growth relationship between male and female branches, leaf morphology, branch dry weight, leaf dry weight, and leaf morphology of P. euphratica in different diameter classes or different canopy layers. In the high canopy and mature development stages, P. euphratica may efficiently provide water and mineral elements for the leaves with large petiole length, the diameter of the petiole, and leaf area through shorter and thicker annual branches. It provides a theoretical basis for further understanding of the differences in environmental adaptability between male and female P. euphratica and the distribution of male and female in the future planting.

Key words: Populus euphratica, allometric growth, morphological characters, biomass, developmental stage

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