Gap dynamics in trembling aspen stands, dendroclimatology of jack pine and tree-ring anomalies in conifers from Manitoba

颤抖白杨林的间隙动态、短叶松的树木气候学和曼尼托巴针叶树的树木年轮异常

• 批准号: 217178-2010
• 负责人: Tardif, Jacques
• 金额: $ 2.48万
• 依托单位: University of Winnipeg
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=523711
• 关键词: Gap; dynamics; trembling; aspen; stands

The proposed research program is a continuity of my previous NSERC research proposals and it has three major components. My first interest is to pursue research on forest disturbances and dynamics. I intend to focus particularly on secondary forest disturbances in trembling aspen dominated forests of the boreal plains of Manitoba. One of the questions that needs to be elucidated concerns the relationship that exist between gap formation in aspen stands and the frequency/severity of forest tent caterpillar (FTC) outbreaks. In the boreal plains of Manitoba, hazelnut also constitutes a major competitor to forest regeneration and we want to quantify the response of understory species to change in environmental condition resulting from the opening of the canopy. The second component concerns the climate sensitivity of the boreal tree species jack pine across its range in Manitoba. This project will be in continuity with our recent work on light rings in the Duck Mountain region of Manitoba and will also involved, among others, the use of tree-ring densitometry to reconstruct past cool growing season. The third component will involve studying tree-ring anomalies (wood anatomy) and also the study of the influence of defoliation on xylem formation in jack pine trees. We recently started to look at light rings in jack pine from western Manitoba and we also initiated some work on density fluctuation in jack pine trees from eastern Manitoba. Across our sampling we also observed a new tree-ring anomaly in the form of white earlywood ring in numerous conifer species. We will specifically look at the impact of jack pine budworm on tree ring anatomy and also look at jack pine plantation outside the current range of distribution of the species in Manitoba. These research projects will have specific outcomes related to forest management in central Canada as well as better understand of how climate is affecting tree growth in central Canada. These projects are unique to Manitoba and our analysis of numerous tree-ring anomalies is essential 1) to understand how environmental fluctuations are affecting tree growth and 2) to provide better reconstruction of past climate fluctuations using tree-ring analysis.

拟议的研究计划是我之前的 NSERC 研究计划的延续，它由三个主要部分组成。我的第一个兴趣是对森林干扰和动态进行研究。我打算特别关注马尼托巴省北方平原以白杨为主的颤抖森林中的次生森林干扰。需要阐明的问题之一是白杨林间间隙的形成与森林帐篷毛毛虫 (FTC) 爆发的频率/严重程度之间存在的关系。在马尼托巴省的北方平原，榛子也是森林再生的主要竞争对手，我们希望量化林下物种对树冠开放导致的环境条件变化的反应。第二个部分涉及马尼托巴省北方树种短叶松的气候敏感性。该项目将与我们最近在曼尼托巴省鸭山地区的光环工作保持连续性，并且还将涉及使用树木年轮密度测量来重建过去凉爽的生长季节。第三部分将涉及研究树木年轮异常（木材解剖学）以及落叶对短叶松木质部形成的影响的研究。我们最近开始研究马尼托巴省西部的短叶松的光环，并且还启动了一些关于马尼托巴省东部的短叶松密度波动的工作。在我们的采样中，我们还在许多针叶树物种中观察到一种新的树木年轮异常现象，即白色早材年轮。我们将专门研究短叶松芽虫对树木年轮解剖结构的影响，并研究马尼托巴省目前该物种分布范围之外的短叶松种植园。这些研究项目将产生与加拿大中部森林管理相关的具体成果，并更好地了解气候如何影响加拿大中部的树木生长。这些项目是马尼托巴省独有的，我们对众多树木年轮异常的分析至关重要：1) 了解环境波动如何影响树木生长；2) 使用树木年轮分析更好地重建过去的气候波动。