Collaborative Research: Testing Paleo to Present Tree Carbon Capture Across Ontogeny, Atmospheric CO2 and Productivity Gradients

合作研究：测试古法以呈现树木在个体发育过程中的碳捕获、大气二氧化碳和生产力梯度

• 批准号: 0743882
• 负责人: Frederick Meinzer
• 金额: $ 48.9万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0743882&HistoricalAwards=false
• 关键词: Collaborative; Research; Testing; Paleo; Present

The goal of this research is a realistic assessment of how atmospheric CO2 concentrations affect carbon capture by forests. Environmental factors, such as temperature and water availability, and tree age greatly influence how tree growth and forest carbon capture are influenced by atmospheric CO2. Tree rings in ancient and modern wood will be used as an archive of tree growth at known points in time, and when combined with independent estimates of climate and CO2 levels over the past 14,000 years, will provide information on how tree growth responds to atmospheric CO2. The tree core samples will be collected for different tree ages and in different environments. Models that predict carbon capture over a broad range of forest age and environmental conditions will be developed from information on several isotope indicators found in the tree rings of modern and ancient wood combined with measurements of photosynthesis in living trees.To date, the influence of CO2 enrichment on forest growth has only been studied in young trees exposed to artificially elevated levels of CO2 in a limited number of costly short-term field studies. The broad applicability of these studies remains uncertain because forest carbon capture depends strongly on tree age and its interactions with site-specific growth environments. This new research provides a unique opportunity to test and enhance understanding of how forest ecosystems respond to climate change. The results will have important implications for policy decisions concerning carbon emissions, land-use and forest management to optimize carbon capture.

这项研究的目标是对大气二氧化碳浓度如何影响森林的碳捕获进行现实的评估。环境因素，如温度和水分的可用性，以及树木的年龄，极大地影响了树木生长和森林碳捕获如何受到大气二氧化碳的影响。古代和现代木材的年轮将被用作已知时间点树木生长的档案，当与过去14000年气候和二氧化碳水平的独立估计相结合时，将提供树木生长如何响应大气二氧化碳的信息。采集不同树龄和不同环境下的树芯样本。将根据在现代和古代木材年轮中发现的几种同位素指标的信息，结合对活树的光合作用的测量，开发出在广泛的森林年龄和环境条件下预测碳捕获的模型。迄今为止，在为数不多的昂贵的短期实地研究中，只在暴露于人为提高的二氧化碳水平的幼树中研究了二氧化碳富集对森林生长的影响。这些研究的广泛适用性仍然不确定，因为森林碳捕获在很大程度上取决于树木年龄及其与特定地点生长环境的相互作用。这项新的研究提供了一个独特的机会来测试和加强对森林生态系统如何应对气候变化的理解。研究结果将对有关碳排放、土地利用和森林管理的政策决定产生重要影响，以优化碳捕获。