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Differences of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) populations in height growth, water use efficiency, and carbon partitioning responses to changes in climate and water availability.

机译：花旗松（Pseudotsuga menziesii（Mirb。）Franco）种群在高度增长，水分利用效率以及碳分配对气候和水利用变化的响应方面的差异。

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摘要

This work deals with understanding differences of Douglas-fir populations in height growth, water use efficiency, and carbon partitioning responses to changes in climate and water availability. Chapter 1 highlights the importance of understanding these differences in the context of climate change. Chapter 2 addresses population differences in three-year height growth in response to changes in climate of interior Douglas-fir populations. Climate change is measured by changes in mean temperature of the coldest month. The data comprised 236 interior Douglas-fir populations from Idaho, Montana, and Eastern Washington, USA, grown in a common garden. The modeling approach used combines species-level and population-specific responses, which was key to detect population-level differences. Results indicate that population maximum height and height growth responses to changes in climate were dependent on their seed source climate. Chapter 3 explores whether Douglas-fir populations presented genetic differences in the response of water use efficiency (WUE) to changes in water availability and whether the different responses are associated with climate characteristics at each population's place of origin. The data comprised thirteen populations and three trees per population growing in a field test in British Columbia during a period of eleven years. WUE was estimated from tree ring delta 13C composition. Tree ring delta13C response to plant transpiration deficits was evaluated with a linear mixed-effects modeling framework. Results were: (1) tree ring delta13C (and WUE) increased linearly with increases in plant transpiration deficits for all populations, (2) populations differed in their mean tree ring delta 13C, (3) these population differences were positively correlated with 30-year tree height, and (4) a population's tree ring delta 13C was positively related to the mean vapor pressure deficit during the frost-free period at its seed source. Chapter 4 assesses population differences in partitioning of photosynthate (A) to aboveground biomass increment (ABI/A), whether differences in ABI/A correlate with the climate at which populations originated, and whether ABI/A is affected by current biomass or the plant transpiration deficit in a given year. The data comprised nine populations, with three trees per population, growing in a common garden in British Columbia during a period of eleven years. Annual photosynthesis was estimated from WUE (from delta13C), vapor pressure deficit, and annual transpiration estimates. Annual aboveground biomass increment was estimated from diameter at breast height measurements and allometric equations. Results are: (1) populations differed in their mean ABI/I, (2) populations from warmer and wetter climates partitioned more of their photosynthate to aboveground biomass, (3) for a given population, ABI/A increased with annual plant transpiration deficit, which we interpreted as a consequence of the occurrence of the deficits late in the growing season at the test site location.
机译：这项工作旨在了解花旗松种群在高度增长，水利用效率以及碳分配对气候和水利用变化的响应方面的差异。第一章强调了在气候变化背景下理解这些差异的重要性。第2章讨论了道格拉斯冷杉内部人口气候变化对三年高度增长的影响。气候变化是通过最冷月份的平均温度变化来衡量的。数据包括来自爱达荷州，蒙大拿州和美国东华盛顿州的236个道格拉斯冷杉内部种群，这些种群生长在一个公共花园中。所使用的建模方法结合了物种水平和特定种群的响应，这是检测种群水平差异的关键。结果表明，人口最大身高和身高增长对气候变化的反应取决于其种子源气候。第3章探讨了道格拉斯冷杉种群是否在水利用效率（WUE）对水利用量变化的响应中表现出遗传差异，以及不同的响应是否与每个人口起源地的气候特征相关。数据包括在不列颠哥伦比亚省进行的十一年实地测试中生长的13个种群和每种群3棵树。从树环δ13C组成估算WUE。用线性混合效应建模框架评估对植物蒸腾亏缺的年轮delta13C响应。结果是：（1）所有种群的树环delta13C（和WUE）随着植物蒸腾亏缺的增加线性增加；（2）种群的平均树环delta 13C有所不同；（3）这些种群差异与30-年树高；（4）在无霜期，其种子源的种群年轮δ13C与平均蒸气压亏缺呈正相关。第4章评估了光合产物（A）与地上生物量增量（ABI / A）的分配中的种群差异，ABI / A的差异是否与种群起源的气候相关，以及ABI / A是否受当前生物量或植物的影响给定年份的蒸腾不足。数据包括九个种群，每个种群三棵树，在不列颠哥伦比亚省的一个公共花园中生长了十一年。年度光合作用由WUE（来自delta13C），蒸气压赤字和年度蒸腾量估算得出。地上生物量的年度增加量是根据胸高测量值和异速方程测得的。结果是：（1）种群的平均ABI / I不同；（2）来自温暖和潮湿气候的种群将更多的光合产物分配给地上生物量；（3）对于给定的种群，ABI / A随着年度植物蒸腾亏缺而增加。 ，我们将其解释为在生长季节后期在测试地点出现赤字的结果。

著录项

  • 作者

    Barrios, Laura P. Leites.;

  • 作者单位

    University of Idaho.;

  • 授予单位 University of Idaho.;
  • 学科 Agriculture Forestry and Wildlife.Biology Plant Physiology.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 109 p.
  • 总页数 109
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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