Coordination of Leaf Physiology and Morphology with Variations in Resources Available to Two Neotropical Tree Species
两种新热带树种可用资源变化下叶片生理学和形态学的协调
基本信息
- 批准号:9220759
- 负责人:
- 金额:$ 19.35万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:1993
- 资助国家:美国
- 起止时间:1993-03-01 至 1996-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
We propose to examine the hypothesis that plant resources are allocated to maximize carbon gain and productivity under the constraints imposed by the seasonality of moisture and irradiance. Lifespan, mass per area, nitrogen concentration, area per plant mass, area-based construction costs, and assimilation capacity of leaves will be examined as determinants of productivity (relative growth rate) during the dry season and wet season in Panama. These features have been hypothesized to be mutually supporting, interdependent, and casually interrelated. Variation in leaf features will be documented over light gradients within the canopies of mature evergreen tropical species, and among seedlings of these species in an experimental common garden with a factorial design of contrasting levels of light and water. These species encompass considerable variation in leaf longevity, while producing new leaves in seasons of contrasting water and light availability. As such they allow the examination of specific predictions about how functional characters vary in response to variation in the opportunity for carbon gain. Studies will be conducted at the Smithsonian Tropical Research Institute (STRI) using a construction crane for access to the canopy of a tropical dry forest. Garden treatments and canopy trees will be followed for three years. These will be the first comprehensive data for within-canopy physiological variation, and the first comparison of seedlings and canopy trees for leaf longevity and function in tropical species. These studies will demonstrate the potential for selection to produce coordinated responses among leaf characters to short-term and long-term variation in resources. If functional relationships among these features prove to be tightly coordinated, such physiological syndromes will provide an empirical link between leaf and whole-plant processes of growth and reproduction. The canopies of tropical trees provide some of the steepest resource gradients known with respect to light, humidity, leaf water, and possibly nutrient, and thus are a model system to assess the relationships among functional characteristics. Because of the great concern over tropical deforestation, there is a pressing need to understand physiological syndromes associated with species capable of rapid regeneration.
我们提出在水分和光照季节性的限制下,植物资源被分配到最大化碳增益和生产力的假设。寿命、每面积质量、氮浓度、每植物质量面积、基于区域的建设成本和叶片的同化能力将作为巴拿马旱季和雨季生产力(相对生长率)的决定因素进行研究。这些特征被假设为相互支持、相互依赖、相互关联。叶片特征的变化将被记录在成熟的常绿热带物种的冠层内的光梯度上,以及这些物种的幼苗在一个实验普通花园中的光和水的对比水平的析因设计中。这些物种在叶片寿命上有相当大的差异,同时在水和光的可用性对比的季节产生新叶。因此,它们允许对功能特征如何随碳获得机会的变化而变化的具体预测进行检查。研究将在史密森尼热带研究所(STRI)进行,使用建筑起重机进入热带干燥森林的树冠。园林处理和树冠树将持续三年。这将是第一个关于冠层内生理变化的综合数据,也是第一个比较热带树种幼苗和冠层树木叶片寿命和功能的数据。这些研究将证明选择在叶片性状之间产生对资源短期和长期变化的协调响应的潜力。如果这些特征之间的功能关系被证明是紧密协调的,这些生理综合征将提供叶片和整个植物生长和繁殖过程之间的经验联系。热带树木的冠层提供了一些已知的关于光、湿度、叶片水分和可能的养分的最陡峭的资源梯度,因此是评估功能特征之间关系的模式系统。由于对热带森林砍伐的极大关注,迫切需要了解与能够快速再生的物种相关的生理综合征。
项目成果
期刊论文数量(0)
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Stephen Mulkey其他文献
Interdisciplinary environmental and sustainability education: islands of progress in a sea of dysfunction
- DOI:
10.1007/s13412-015-0279-z - 发表时间:
2015-07-04 - 期刊:
- 影响因子:2.300
- 作者:
Shirley Vincent;J. Timmons Roberts;Stephen Mulkey - 通讯作者:
Stephen Mulkey
Stephen Mulkey的其他文献
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{{ truncateString('Stephen Mulkey', 18)}}的其他基金
SGER: Branch Carbon Balance and Allocation During an Extreme El Nino and La Nina in a Wet Neotropical Forest
SGER:湿新热带森林极端厄尔尼诺和拉尼娜现象期间的枝条碳平衡和分配
- 批准号:
9805908 - 财政年份:1998
- 资助金额:
$ 19.35万 - 项目类别:
Standard Grant
Multi-User Analytical Equipment for the Plant Ecology Program at UM-St. Louis
UM-St. 植物生态学项目的多用户分析设备
- 批准号:
9419994 - 财政年份:1995
- 资助金额:
$ 19.35万 - 项目类别:
Standard Grant
Dissertation Research: Nutrient Translocation Through VA Mycorrhizae & the Effects on Plant Performance & Early Succession under Differential Light in a Lowland Tro
论文研究:通过 VA 菌根进行养分转运
- 批准号:
9311079 - 财政年份:1993
- 资助金额:
$ 19.35万 - 项目类别:
Standard Grant
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