DISSERTATION RESEARCH: Testing multiple determinants of growth rate-mass scaling relationships in an Amazonian forest

论文研究：测试亚马逊森林中生长率与质量缩放关系的多个决定因素

• 批准号: 0807221
• 负责人: Brian Enquist
• 金额: $ 1.19万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-06-01 至 2011-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0807221&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; Testing; multiple; determinants

Understanding how tree growth rates change with tree size is an essential ecological question. This relationship between growth-rate and size-scaling may result from common properties of vascular networks. While network theory may explain global trends in growth rate size scaling it has been less successful locally; at local scales network theory leaves much variability between species and individuals unexplained. This study aims to extend network theory to local scales by accounting for two additional factors: (i) tree traits (for example, photosynthetic properties and branching patterns) and (ii) light limitation. In the Tapajós National Forest (PA, Brazil), this study will sample many individuals of ten species across a size range and track individual growth, traits, and light environments. These data will allow the factors responsible for variation in growth rate size scaling to be evaluated.This study will help illuminate the role of the Amazon (and tropical forests broadly) in climate change. Growth must be tallied across tree sizes to understand how much of the greenhouse gas carbon dioxide the Amazon takes out of the atmosphere. Since this study will ask what factors cause growth rate to change with size, it will also ask what factors drive carbon dioxide uptake and strengthen the link between climate change and the ecology of the Amazon.

了解树木生长率如何随着树木大小而变化是一个重要的生态问题。 生长速率和尺寸缩放之间的这种关系可能是由于脉管网络的共同性质。 虽然网络理论可以解释全球的增长率，规模缩放的趋势，但它在局部不太成功;在局部尺度上，网络理论留下了许多物种和个体之间的变异性无法解释。 本研究旨在通过考虑两个额外因素将网络理论扩展到局部尺度：（i）树木性状（例如，光合特性和分支模式）和（ii）光限制。 在Tapajós国家森林（PA，巴西），这项研究将在一个大小范围内对10个物种的许多个体进行采样，并跟踪个体的生长，特征和光环境。 这些数据将允许的因素，负责在增长率大小缩放变化进行评估。这项研究将有助于阐明亚马逊（和广泛的热带森林）在气候变化中的作用。 必须计算树木的生长情况，以了解亚马逊从大气中吸收了多少温室气体二氧化碳。 由于这项研究将询问是什么因素导致生长率随大小而变化，它还将询问是什么因素驱动二氧化碳吸收并加强气候变化与亚马逊生态之间的联系。