Hydraulic Limits to Photosynthetic Performance in Tropical Dry Forest Trees

热带干燥森林树木光合性能的水力限制

• 批准号: 0212792
• 负责人: Noel Holbrook
• 金额: $ 15万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-01 至 2005-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0212792&HistoricalAwards=false
• 关键词: Hydraulic; Limits; Photosynthetic; Performance; Tropical

This study addresses the degree to which the water transport capacity of plants limits their productivity. Specifically, we focus on the hydraulic properties of tree stems and branches (the "xylem") in relation to the photosynthetic capacity of the leaves. Our goal is to understand the physiological linkages between vascular and photosynthetic capacity. We have chosen to address this fundamental question by examining seasonally dry forest trees. Our rationale for this reflects the important role that seasonal precipitation patterns play in determining the longevity and productivity of leaves in these forests. We will monitor the extent to which vascular tissues become damaged during periods of low water availability (drought) and the effects that this has on the productivity of leaves. Our study will be one of the first to examine directly the link between vascular and photosynthetic capacity in trees. The results of this work will increase our understanding of how plants copy with dramatic changes in soil water availability, and will contribute to our knowledge of factors influencing the productivity and ecology of seasonally dry tropical forests.

这项研究解决了植物的水分运输能力限制其生产力的程度。 具体来说，我们专注于树木的茎和分支（“木质部”）的水力特性与光合能力的叶子。 我们的目标是了解血管和光合能力之间的生理联系。 我们选择通过研究季节性干旱的森林树木来解决这个基本问题。 我们这样做的理由反映了季节性降水模式在决定这些森林中叶子的寿命和生产力方面发挥的重要作用。 我们将监测维管组织在低水可用性（干旱）期间受损的程度，以及这对叶片生产力的影响。 我们的研究将是第一个直接研究树木血管和光合能力之间联系的研究。 这项工作的结果将增加我们对植物如何复制土壤水分供应的巨大变化的理解，并将有助于我们了解影响季节性干旱热带森林生产力和生态的因素。