不同居群唐古特白刺叶片解剖特征对生境的响应研究
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引用本文:白 潇,李 毅,苏世平,赵小仙.不同居群唐古特白刺叶片解剖特征对生境的响应研究[J].西北植物学报,2013,33(10):1986~1993
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作者单位
白 潇,李 毅*,苏世平,赵小仙 (甘肃农业大学 林学院,兰州 730070) 
基金项目:国家国际科技合作专项(2012DFR30830)
中文摘要:以河西走廊不同生境的3个天然居群(WMX、ZGL、JGC)唐古特白刺为研究对象,对叶片进行解剖观察,测定其叶片长、宽、厚,表皮毛长、宽及密度,气孔器长、宽、面积及密度,角质层厚,表皮细胞厚,栅栏组织厚,海绵组织厚,主脉直径,支脉直径,含晶细胞直径,粘液细胞长、宽,贮水组织长、宽;并对栅海比(P/S)、叶片组织结构紧密度(CTR)、疏松度(SR)等指标进行统计分析,比较同一指标在3个居群间的差异,以探讨其叶片的形态解剖特征对不同生境的适应性响应机制。结果表明:(1)3个天然居群唐古特白刺除叶片长、宽、长宽比及下表皮毛宽外,其余各指标均存在不同程度差异,其中叶厚、叶面积、上下表皮毛长度及密度、上下气孔器长度及密度、上表皮细胞厚度、上下栅栏组织厚度、海绵组织厚度、P/S、CTR、维管束直径以及粘液细胞长宽在3个居群间均显著差异。(2)3个居群的综合指标变异系数和可塑性指数的均值排序一致,指标均值的排序均为JGC>WMX>ZGL,表明3个居群唐古特白刺的生态适应性强弱为JGC>WMX>ZGL。(3)3个居群唐古特白刺的栅栏组织、海绵组织、表皮毛、角质层的可塑性指数均相对较高,说明在应对不同环境时这些组织起着主导作用,这可能是唐古特白刺叶片解剖特征对不同生境条件的适应性响应机制。
中文关键词:唐古特白刺  解剖结构  不同生境  天然居群  生态适应性
 
Response of Leaf Anatomical Characteristics of Nitraria tangutorum Bobr.from Different Populations to Habitats
Abstract:The leaf anatomical structure of Nitraria tangutorum Bobr.from three natural populations(WMX,ZGL,JGC) of different habitats along Hexi corridor were researched.The leaves were anatomically observed,and indexes including leaf length,width and thickness,upper and lower pubescence length,width and density,upper and lower stoma length,width,area and density,upper and lower cuticle thickness,upper and lower epidermal cell thickness,palisade tissue thickness,spongy tissue thickness,diameter of main vein,diameter of lateral vein,diameter of crystal cell,mucilage cell length,width and aqueous tissue length,width were measured.At the same time,the ratio of palisade tissue thickness to spongy tissue thickness (P/S),tightness (CTR) and looseness of leaf tissue structure were statistically analyzed.The differences of one index among three populations were compared to explore the adaptive response mechanism of leaf morphology anatomy features to different habitats.The results are as follows:(1)The indexes had different degrees of differences except some indexes including leaf length,width,ratio of length to width and lower pubescence width,the indexes such as leaf thickness and area,upper and lower pubescence length and density,upper and lower stoma length and density,upper epidermal cell thickness,upper and lower palisade tissue thickness,spongy tissue thickness,but P/S,CTR,diameter of vascular bundle,mucilage cell length and width all had significant differences among three populations.(2)The rank of variation coefficients and plasticity indices of aggregative indicators from three populations were the same,the order was JGC>WMX>ZGL.It showed that the ecological adaptability of N.tangutorum Bobr.was JGC>WMX>ZGL.(3)The plasticity indices of palisade tissue,spongy tissue,pubescence,cuticle of N.tangutorum Bobr.from three populations were relatively high.These organizations played a dominant role in response to different environment.The results above may be the adaptive response mechanism of leaf anatomical characteristics to different habitat conditions.
keywords:Nitraria tangutorum Bobr.  anatomical structure  different habitats  natural populations  ecological adaptability
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