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: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=507030
• 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以前的NSERC研究建议的连续性，它具有三个主要组成部分。我的第一个兴趣是从事森林干扰和动态的研究。我打算特别关注曼尼托巴省北方平原的颤抖的阿斯彭森林中的次要森林干扰。需要阐明的问题之一涉及阿斯彭架上的间隙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。在曼尼托巴省的北方平原中，榛子也构成了森林再生的主要竞争者，我们希望量化林木物种对冠层开放而导致的环境状况变化的反应。第二部分涉及北方树种在曼尼托巴省范围内的气候敏感性。该项目将与我们最近在曼尼托巴省鸭山地区进行轻环的工作保持连续性，还将参与使用树环密度法以重建过去凉爽的生长季节。第三个组成部分将涉及研究树环异常（木材解剖结构），以及研究脱叶对千斤顶松树中木质部形成的影响。最近，我们开始看曼尼托巴省西部的杰克·派恩（Jack Pine）的灯环，我们还开始了一些关于曼尼托巴省东部杰克松树的密度波动的工作。在我们的抽样过程中，我们还观察到了许多针叶树中的白色早期木环形式的新树环异常。我们将专门研究杰克松芽虫对树环解剖结构的影响，并查看曼尼托巴省该物种当前分布范围之外的杰克松树种植园。这些研究项目将具有与加拿大中部森林管理有关的具体结果，并更好地了解气候如何影响加拿大中部的树木生长。这些项目是曼尼托巴省独有的，我们对众多树环异常的分析至关重要。1）了解环境波动如何影响树木的生长以及2）使用树环分析更好地重建过去气候波动。