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Dissertation Research: Climate Change, Hydraulic Function, and Ecotypic Variation in Spatially Isolated Ponderosa Pine Populations

论文研究：气候变化、水力功能和空间孤立的黄松种群的生态型变化

基本信息

批准号：
9800932
负责人：
Evan DeLucia
金额：
$ 0.52万
依托单位：
University of Illinois at Urbana-Champaign
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：
1998-06-15 至 2000-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9800932&HistoricalAwards=false
关键词：
Dissertation Research Climate Change Hydraulic

项目摘要

DeLucia 9800932 The change in climate expected in the next century will challenge the capacity of trees to acclimate to increased temperatures and aridity. The dry atmospheric conditions of an and climate increase evaporation from the leaf surfaces of a plant (transpiration), increasing moisture requirements. The PIs used a geographic comparison of Ponderosa pine populations growing on a climate gradient as a proxy for differences between the current and future climate. The PIs found that trees growing in a warm, dry versus a cool, moist climate increased biomass allocation to sapwood (water conducting tissue) relative to leaves. To determine if these changes in tree structure may be physiological and evolutionary adaptations to an and climate, we propose to examine four research questions. First, does increased allocation to sapwood relative to leaves increase transpiration in and trees? Second, does increased allocation to sapwood reduce the probability of dehydration during prolonged summer droughts? Third, does increased allocation to sapwood provide greater water storage in and trees? Fourth, does the physiological and structural response of Ponderosa pine to aridity have an underlying genetic basis? The proposed research will establish direct links between tree structure and function and permit predictions to be made about the physiological and evolutionary potential of Ponderosa pine to respond to climate change.

DeLucia 9800932 预计下世纪的气候变化将挑战树木适应温度升高和干旱的能力。干燥的大气条件和气候增加了植物叶片表面的蒸发（蒸腾），增加了对水分的需求。 PI使用在气候梯度上生长的黄松种群的地理比较作为当前和未来气候之间差异的代理。PI发现，树木生长在一个温暖，干燥与凉爽，潮湿的气候增加生物量分配边材（水传导组织）相对于树叶。为了确定这些变化在树的结构可能是生理和进化适应气候，我们建议检查四个研究问题。第一，增加边材相对于叶片的分配是否增加了树木的蒸腾作用？其次，增加边材分配是否会降低夏季长期干旱期间脱水的可能性？第三，增加边材的分配是否能增加树木的储水量？第四，黄松对干旱的生理和结构反应是否有潜在的遗传基础？拟议的研究将建立树木结构和功能之间的直接联系，并允许预测黄松应对气候变化的生理和进化潜力。