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首页> 外文学位 >Responses of leaf gas exchange to environmental variation in two widely dispersed Juniperus species versus a narrowly restricted endemic, Petrophytum cinerascens (Juniperus occidentalis, J. osteosperma).
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Responses of leaf gas exchange to environmental variation in two widely dispersed Juniperus species versus a narrowly restricted endemic, Petrophytum cinerascens (Juniperus occidentalis, J. osteosperma).

机译：与两种狭窄分布的地方性灰质Petroptum cinerascens（Juniperus occidentalis，J.osteosperma）相比，两种广泛分布的杜松属植物叶片气体交换对环境变化的响应。

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摘要

I determined how ecophysiological characteristics of Juniperus occidentalis and Juniperus osteosperma changed along elevational and regional environmental gradients in the Great Basin. Two north-south groupings were realized based on daily carbon assimilation (north, 157.6 {dollar}mu{dollar}mol g{dollar}sp{lcub}-1{rcub}{dollar}s{dollar}sp{lcub}-1{rcub};{dollar} south, 113 {dollar}mu{dollar}mol g{dollar}sp{lcub}-1{rcub}{dollar}s{dollar}sp{lcub}-1{rcub}){dollar}, but these groupings are not solely related to environment and cut across species boundaries. The two species functioned similarly across large elevational and regional variation in environment, perhaps explaining their ability to persist and grow over a wide range of environmental conditions.; I also determined that when Petrophytum cinerascens, a highly restricted endemic found in eastern Washington, was grown at increased temperatures, photosynthesis did not acclimate (30/16 = 11.07, 34/20 = 9.43 and {dollar}rm 38/24spcirc C = 6.4 mu mol msp{lcub}-2{rcub}ssp{lcub}-1{rcub}).{dollar} The large decrease in photosynthesis with increased temperature indicate global warming may be detrimental to P. cinerascens. In contrast to the Juniperus species, P. cinerascens is not very physiologically flexible and may serve as an indicator of global change.
机译：我确定了大盆地中西洋杜鹃和杜松杜鹃的生态生理特征如何随海拔和区域环境梯度变化。基于每日的碳同化，实现了两个南北分组（北，157.6 {dol} mu {dol} mol g {dollar} sp {lcub} -1 {rcub} {dollar} s {dollar} sp {lcub} -1 {rcub}; {dollar} South，113 {dollar} mu {dollar} mol g {dollar} sp {lcub} -1 {rcub} {dollar} s {dollar} sp {lcub} -1 {rcub}）{dollar }，但这些分组不仅与环境有关，而且跨物种边界。这两个物种在较大的海拔和区域环境变化中具有相似的功能，这也许可以解释其在各种环境条件下的持久生存能力。我还确定，在华盛顿东部发现的高度受限制的地方特有的Petrophytum cinerascens在升高的温度下生长时，光合作用无法适应（30/16 = 11.07、34 / 20 = 9.43和{rm} rm 38 / 24spcirc C = 6.4 （mol mol msp {lcub} -2 {rcub} ssp {lcub} -1 {rcub}）。{美元}随着温度升高，光合作用的大幅下降表明全球变暖可能对灰黄假单胞菌不利。与杜松属植物相比，灰质疟原虫在生理上不是很灵活，可以作为全球变化的指标。

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  • 作者

    Moore, Darrin John.;

  • 作者单位

    University of Nevada, Reno.;

  • 授予单位 University of Nevada, Reno.;
  • 学科 Biology Plant Physiology.; Biology Ecology.
  • 学位 M.S.
  • 年度 1998
  • 页码 66 p.
  • 总页数 66
  • 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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