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首页> 外文学位 >Variation in leaf lifespan, relative growth rate, and underlying structural leaf traits in wetland plants originating along a latitudinal gradient of growing season length in Ontario.
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Variation in leaf lifespan, relative growth rate, and underlying structural leaf traits in wetland plants originating along a latitudinal gradient of growing season length in Ontario.

机译：沿安大略生长季节长度的纬度梯度产生的湿地植物的叶片寿命，相对生长速率和潜在的结构叶片性状的变化。

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摘要

We investigated the growth strategies of 12 graminoid plant species by assessing intraspecific variation in both leaf lifespans and 3 structural leaf traits (specific leaf area, leaf dry matter content, and leaf lamina thickness) in response to a latitudinal gradient of growing season length. Variation in the relative growth rate of above-ground biomass production was also examined far 3 of the species. Plants were collected during the summer of 2002 from 5 regions along a study gradient (range in growing season length = 190 to 154 days) and transplanted into individual pots within a common garden in Sudbury, ON. Intraspecific trends indicated both the establishment of ecotypes along the gradient and the selection of leaf characteristics associated with a rapid growth strategy. Lifespans of leaves emerging late in the season (August) were found to be significantly shorter in plants originating from more northern regions. Leaf dry matter content was found to relate positively and lamina thickness negatively with the gradient of growing season length. Significant intraspecific differences showed plants from more northern regions to possess higher rates of relative growth compared with their southern counterparts. Ecotypic trends may indicate that the shortness of the growing season (disturbance) is a more important selective agent than the harshness of the environment (stress) when shaping competitive, resource-acquiring growth strategies in herbaceous plant life forms.
机译：我们通过评估叶片寿命和3个结构叶片性状（特定叶片面积，叶片干物质含量和叶片叶片厚度）的种内变异对生长季节长度的纬度梯度的响应，研究了12种禾本科植物的生长策略。地上生物量生产的相对增长率的变化也被检查了该物种的近3个。在2002年夏季，按照研究梯度（生长季节长度= 190至154天）从5个地区收集了植物，并将其移植到安大略省萨德伯里的一个公共花园中的单个盆中。种内趋势既表明沿梯度建立生态型，又表明选择与快速生长策略有关的叶片特征。发现来自较北部地区的植物在该季节后期（8月）出苗的叶片寿命明显缩短。发现叶片干物质含量与生长季节长度的梯度呈正相关而与叶片厚度呈负相关。种内显着差异表明，与南部同类植物相比，来自更多北部地区的植物具有较高的相对生长速率。生态型趋势可能表明，在以草本植物生命形式制定竞争性的，需要资源的生长策略时，生长期的短缺（干扰）比环境的恶劣（压力）是更重要的选择因子。

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  • 作者

    Coulas, Jess Alexander.;

  • 作者单位

    Laurentian University of Sudbury (Canada).;

  • 授予单位 Laurentian University of Sudbury (Canada).;
  • 学科 Biology Botany.; Biology Ecology.
  • 学位 M.Sc.
  • 年度 2005
  • 页码 132 p.
  • 总页数 132
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 植物学;生态学（生物生态学）;
  • 关键词

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