胡杨不同发育阶段叶片形态解剖学特征及其与胸径的关系

Relationship between Morphological or Anatomical Features of Leaves and Trunk Diameter at Breast Height at Different Growing Stages of Populus euphratica

采用MSR-9600TFU2扫描仪和常规石蜡切片,分析胡杨不同发育阶段叶片形态解剖学特征及其与胸径的关系。结果表明:1叶片宽、叶面积、气孔密度、厚度均随胸径增加沿树冠基部向顶部方向逐渐增大,叶片长和叶形指数则随胸径增加沿树冠基部向顶部方向逐渐减小。2叶片上下表皮细胞数和表皮细胞长、栅栏组织厚度、栅栏组织细胞长和宽均随胸径增加沿树冠基部向顶部方向逐渐增大;海绵组织厚度随胸径的增加而逐渐减小,树冠基部向顶部方向则逐渐增大。3相关分析显示,叶片宽、叶面积和叶片厚度分别与胸径呈极显著/显著正相关,叶形指数与胸径呈极显著负相关;叶片栅栏组织厚度、表皮细胞数、表皮组织厚度、表皮细胞长分别与胸径呈极显著/显著正相关,海绵组织厚度与胸径呈极显著负相关;叶片形态指标与解剖结构指标间也存在正/负相关关系,表明胡杨叶形态结构变化与个体发育阶段密切相关。

In this study, the leaf morphological and structural features of Populus euphratica at different growing stages and their relationships with DBH were researched. Results are as follows ： （1） Along with the increase of DBH and crown level from the base to the top, the leaf width, area, stomatal density and thickness of leaves of P. euphratica were gradually increased, while the leaf length and leaf index （ leaf length/leaf width） were steadily decreased ; （2） The cell number,length of epidermal ceils and thickness, and length and width of palisade tissue were gradually increased with the increase of diameter at breast height and crown level （from base to top）, while the thickness of spongy tissue was gradually decreased with the increase of diameter at breast height but increased gradually from the base to the top; （3） Correlation analysis revealed that there were the extremely significant or significant positive correlations between the DBH and the leaf width, area and thickness, but there was a significant negative one between DBH and leaf index. There were the significant positive or negative correlations between palisade tissue thickness, epidermal cell length, cell number, thickness of epidermal tissue and DBH. There was a significant negative correlation between thickness of spongy tissue and DBH. There were also the significant positive or negative correlation between leaf morphological parameters and leaf anatomical and structure parameters.