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树木大小变化是一个重要的生态问题，生长率和大小缩放之间的关系可能是由血管网络的共同特性引起的，虽然网络理论可以解释生长率大小缩放的全球趋势。局部成功；在局部尺度上，网络理论留下了物种和个体之间的许多可变性，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）树木特征（例如，光合特性和分枝模式）和。 (ii) 光照限制。在塔帕若斯国家森林（巴西宾夕法尼亚州），这项研究将对不同大小范围内的十个物种的许多个体进行采样，并跟踪个体的生长、性状和光照环境。这些数据将使导致生长率大小变化的因素得以缩放。这项研究将有助于阐明亚马逊（以及广泛的热带森林）在气候变化中的作用，必须根据树木的大小来计算生长情况，以了解亚马逊从大气中吸收了多少温室气体二氧化碳。研究将询问哪些因素导致增长率随大小而变化，它还将询问哪些因素推动二氧化碳的吸收并加强气候变化与亚马逊生态之间的联系。