Collaborative Research: P2C2--Growth Dynamics in the Climate Control of Tree-Ring Variability for Paleoclimatology

合作研究：P2C2--古气候学树木年轮变异气候控制中的生长动态

• 批准号: 1303740
• 负责人: Malcolm Hughes
• 金额: $ 59.76万
• 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: 2014
• 资助国家: 美国
• 起止时间: 2014-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1303740&HistoricalAwards=false
• 关键词: Collaborative; Research; P2C2; Growth; Dynamics

Tree rings are an important natural archive of past environments. Though these records have great value and potential, important details about rates and patterns of carbon storage in annual growth layers (tree rings) remain poorly understood. These gaps in knowledge concern the basic natural history of the tissue that forms wood. This research, led by scientists from the University of Arizona and Rocky Mountain Tree-Ring Research, Inc., aims to improve the scientific basis for the use of tree ring records by compiling data sets of when key tree growth processes start each year, the rate at which each proceeds and for how long, and how daily to seasonal variations in climate conditions relate to the timing, rate, and magnitude of each process. This will be the first such study in the Western US. The research team will collect data at four clusters of sites in Wyoming, Colorado and Arizona, all centered on existing flux tower facilities and including the major tree types used in dendroclimatology in this large region. They will then compare the tree growth data with air, stem and soil temperature, water availability, sapflow and other factors, as well as phenological events such as shoot extension and needle elongation. These data and comparisons are essential for improving forward models of tree ring growth control. The methods, based on and informed by sound process models of the climate control of tree ring formation, have the potential to improve robustness, extend generality, and better assess the biological validity of climate reconstructions based on tree rings. Such methods are also central to emerging Bayesian techniques of paleoclimate reconstruction, and to attempts to test reconstruction methodologies using synthetic proxy records.The broader impacts of this research include improved understanding of past climates and improved understanding and prediction of responses of wood growth in western forests to recent or possible future climates. The latter is a significant practical concern, as much of the carbon in forests is stored in wood, and the results of this research will further inform projections of carbon allocation and storage in response to climate change. The project will involve undergraduate researchers in field and lab work and the publication of results. The PIs will engage in outreach both directly through public talks and media interviews as well as through the University of Arizona Extension Service.

树木年轮是过去环境的重要自然档案。虽然这些记录具有巨大的价值和潜力，但对年度生长层（树木年轮）中碳储存的速率和模式的重要细节仍然知之甚少。这些知识的空白涉及形成木材的组织的基本自然历史。这项由亚利桑那大学和落基山树木年轮研究公司的科学家领导的研究，旨在通过汇编每年关键树木生长过程开始的时间、每个过程的速度和持续时间以及气候条件的每日至季节变化如何与每个过程的时间、速度和幅度相关的数据集，改善使用树木年轮记录的科学基础。这将是美国西部的第一项此类研究。研究小组将在怀俄明州、科罗拉多和亚利桑那州的四个地点收集数据，所有这些地点都以现有的通量塔设施为中心，包括这一大区域树木气候学中使用的主要树木类型。然后，他们将树木生长数据与空气，茎和土壤温度，水的可用性，液流和其他因素，以及物候事件，如枝条延伸和针叶伸长进行比较。这些数据和比较对于改进树木年轮生长控制的正演模型是必不可少的。该方法，基于和通知健全的过程模型的气候控制的树木年轮形成，有可能提高鲁棒性，扩展的一般性，更好地评估生物有效性的气候重建的基础上树木年轮。这种方法也是核心新兴的贝叶斯技术的古气候重建，并试图测试重建方法，使用合成的代理records.The更广泛的影响，这项研究包括提高认识，过去的气候和提高认识和预测的响应木材生长在西部森林最近或可能的未来气候。后者是一个重要的实际问题，因为森林中的碳大部分储存在木材中，这项研究的结果将进一步为应对气候变化的碳分配和储存预测提供信息。该项目将涉及本科研究人员在现场和实验室工作和结果的出版。PI将直接通过公开演讲和媒体采访以及通过亚利桑那大学推广服务进行外展。