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兰州北山刺槐不同等级叶脉密度与叶大小关系的坡向差异性

徐婷,赵成章*,段贝贝,韩玲,郑慧玲,冯威   

  1. (西北师范大学地理与环境科学学院, 甘肃省湿地资源保护与产业发展工程研究中心, 兰州 730070)
  • 出版日期:2016-01-10 发布日期:2016-01-10

Slope-related variations of different levels of vein density and leaf size in Robinia pseudoacacia in the northern mountains of Lanzhou.

XU Ting, ZHAO Cheng-zhang*, DUAN Bei-bei, HAN Ling, ZHENG Hui-ling, FENG Wei   

  1. (Research Center of Wetland Resources Protection and Industrial Development Engineering of Gansu Province, College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China)
  • Online:2016-01-10 Published:2016-01-10

摘要: 植物不同等级的叶脉承担着不同的功能,叶脉密度与叶大小的异速生长模式有助于揭示植物表型可塑性形成机制。利用ArcGIS建立研究区域的数字高程模型(DEM),采用标准化主轴估计(standardized major axis estimation, SMA)方法,研究了兰州市北山不同坡向人工林刺槐(Robinia pseudoacacia)一级和二级叶脉密度与叶大小的关系。结果表明:随坡向由北坡向东坡、南坡和西坡转变,植被群落的郁闭度、高度和土壤含水量呈现先减小后增大趋势,刺槐的单叶面积、比叶面积和叶片偏心率(eccentricity)呈先减小后增大趋势,刺槐叶片的一级和二级叶脉密度呈先增大后减小趋势;4个坡向刺槐一级叶脉密度与叶面积呈显著的负相关关系(P<0.05),二级叶脉密度与叶面积呈极显著负相关关系(P<0.01),斜率均显著大于-1。刺槐叶大小与不同等级叶脉密度权衡关系的坡向差异,是植物对异质性生境适应的结果。

关键词: 灌木, 长度, 生物量, 估算模型, 基径

Abstract: Different vein levels of plant have different functions, and the allometric growth pattern of the vein density and leaf size has important implications for understanding plant phenotypic plasticity. In this study, ArcGIS was used to construct the digital elevation model (DEM) for the study sites. We aimed to study the allometrical growth relationship between the 1° and 2° veins densities and leaf size of Robinia pseudoacacia at different slope aspects on the northern mountains of Lanzhou with the method of standardized major axis estimation (SMA). The results showed that with the change of slope aspect from north to east, south and west, the crown density, height and the soil moisture of the plant community decreased first and then increased, the individual leaf size and specific leaf area and the leaf eccentricity of R. pseudoacacia displayed a pattern of decreaseincrease, and the 1° and 2° veins densities displayed a pattern of increasedecrease. There was a negative allometric correlation between the 1° vein density and the leaf size on different slope aspects (P<0.05), and a significant negative allometric correlation between the 2° vein density and the leaf size on different slope aspects (P<0.01), with the slopes being greater than -1. The sloperelated variations in the tradeoff between leaf size and different levels of vein density of R. pseudoacacia are the result of plant’s adaptation to habitat heterogeneity.

Key words: shrub, diameter, biomass, estimation model, length