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当前位置: 首页 > 文章 > 荒漠植物胡杨不同发育阶段的枝系构型可塑性研究 新疆农业科学 2015,52 (11) 2076-2084
Position: Home > Articles > Research on Branch Architectural Characteristics of Populus euphratica at Different Developmental Stages Xinjiang Agricultural Sciences 2015,52 (11) 2076-2084

荒漠植物胡杨不同发育阶段的枝系构型可塑性研究

作  者：
于秀立;田中平;李桂芳;吕新华;庄丽
单  位：
石河子大学化学化工学院;石河子大学生命科学学院
关键词：
枝系构型;不同发育阶段;胡杨;准噶尔盆地南缘
摘  要：
【目的】以准噶尔盆地南缘荒漠植物胡杨为研究对象,对其不同发育阶段的枝系构型特征进行研究,为荒漠植物的生态适应性及进化机制提供理论依据,并为防风林的配置提供一定的理论数据。【方法】根据胡杨胸径的大小,比较胡杨不同生长发育阶段的枝系构型特征值:分枝长度,分枝角度,枝径比,逐步分枝率和总体分枝率。【结果】(1)树冠不同部位构型格局中,各级分枝长度数值和各级分枝角度数值从上到下均表现为逐渐变大的趋势;(2)幼龄期、中龄期和老龄期分枝长度从第3级到1级排序为老龄期>中龄期>幼龄期,且幼龄期、中龄期和老龄期枝条伸展能力从第3级到1级呈现相对减弱的趋势;(3)不同生长发育阶段的各级分枝角度没有明显变化,除当年生、2级和3级分枝角度之间差异显著之外,其他类型之间的差异不显著;各分枝角度不仅随枝级的增加而增而且随发育程度的增加而增大;(4)在胡杨植株生长过程中,其植株枝径比差异不显著(P<0.05);(5)幼龄期、中龄期和老龄期的总体分枝率和逐步分枝率均呈现差异显著(P<0.05),且总体分枝率均较大,分别为1.95±0.15、1.96±0.07和2.38±0.05。【结论】胡杨植冠构型在空间分布格局上呈现一定的可塑性,而且胡杨在不同生长发育阶段上枝系构型也呈现一定的可塑性。与灰叶胡杨枝系构型有一定的相似性。
译  名：
Research on Branch Architectural Characteristics of Populus euphratica at Different Developmental Stages
作  者：
YU Xiu-li;TIAN Zhong-ping;LI Gui-fang;L Xin-hua;ZHUANG Li;College of Life Science,Shihezi University;Collge of Chemisty and Chemical Engineering,Shihezi University;
关键词：
branch system configuration;;developmental stages;;Populus euphratica;;the south edge of Junnger Basin
摘  要：
【Objective】The desert plant Populus euphratica at the south edge of Junnger Basin was taken as test object,their branching architecture characteristics at different developmental stages were studied in order to provide a theoretical basis for ecological adaptation and evolutionary mechanisms of desert plants and a theoretical data for windbreak configuration.【Method】According to the size of diameter at breast height,the branch length,branching angle,diameter ratio,over bifurcation ratio and stepwise bifurcation ratio that reflect branching architecture characteristic were compared at different developmental stages.【Result】1) The branch length and branching angle of all types changed regularly. The branch length increased gradually from upper to low,so did the branching angle; 2) The order of the branch length at juvenile stage,middle stage and aging stage was: aging stage > middle stage > juvenile stage from the third class to the first class; 3) The branch angle at different developmental stages did not change significantly. In addition to the branch angle of the first,the second and the third class,others did not change significantly. All branch angles increased along with the branch level during the individual development; 4) The differences among diameter ratios were significant( P < 0. 05); 5) Both the over bifurcation ratio and the stepwise bifurcation ratio were significantly different at aging stage,middle stage and juvenile stage( P < 0. 05),and the over bifurcation ratio of aging stage,middle stage and juvenile stage was 1. 95 ± 0. 15,1. 96 ± 0. 07 and 2. 38 ± 0. 05,respectively. 【Conclusion】The canopy configuration of P. euphratica presented certain plasticity,and the branch architectural characteristics of P. euphratica at different developmental stages also displayed certain plasticity. The branch architectural characteristics had some similarity with Populus pruinosa.

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