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Dissertation Research: Linking Leaf Lifespan to Distribution and Growth Strategies of Oaks: Implications for Global Change

论文研究：将叶子寿命与橡树的分布和生长策略联系起来：对全球变化的影响

基本信息

批准号：
9801455
负责人：
Fakhri Bazzaz
金额：
$ 0.65万
依托单位：
Harvard University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1998
资助国家：
美国
起止时间：
1998-07-01 至 2000-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9801455&HistoricalAwards=false
关键词：
Dissertation Research Linking Leaf Lifespan

项目摘要

9801455 Bazzaz This research will investigate the function of leaf lifespan in relation to other plant traits and to habitat in 15 co-occurring species of the oak genus. Leaf lifespans will be used to characterize oaks into functional groups that may be used to predict responses to elevated CO2. The research will be conducted on mature trees in three field sites in northern Florida and on seedlings in greenhouse experiments. The study system provides a large number of closely related species which are structurally and physiologically very similar, and are all found in the same geographic region, but which have contrasting leaf lifespans. This permits study of traits that vary with leaf lifespan, without additional trait variation due to different evolutionary origins or to climatic differences. The research has three major components: 1) quantification of the relationships between leaf lifespan and plant traits important for carbon, nutrient and water utilization in oaks, 2) a field survey of abundance and percent cover of oak species across soil moisture and nutrient gradients to determine whether leaf lifespan is correlated to soil properties, and 3) a greenhouse experiment to determine whether leaf lifespan is a useful parameter in predicting growth enhancement of oaks under elevated CO2.

9801455 Bazzaz本研究将调查叶寿命的功能与其他植物性状和栖息地在15个共同发生的物种的橡树属。叶寿命将被用来表征橡树的功能组，可用于预测对CO2浓度升高的反应。这项研究将在北方佛罗里达的三个田间地点的成熟树木和温室实验中的幼苗上进行。该研究系统提供了大量密切相关的物种，这些物种在结构和生理上非常相似，并且都在同一地理区域发现，但具有不同的叶寿命。这允许研究随叶寿命而变化的性状，而不会由于不同的进化起源或气候差异而产生额外的性状变异。该研究有三个主要组成部分：1）量化叶片寿命和对橡树中的碳、养分和水利用重要的植物性状之间的关系，2）跨越土壤水分和养分梯度的橡树物种的丰度和覆盖百分比的实地调查，以确定叶片寿命是否与土壤性质相关，3）温室实验，以确定叶片寿命是否是一个有用的参数，在预测高CO2浓度下的橡树生长增强。