Understanding the climate/radial-growth relationships of Northern Labrador trees

了解北拉布拉多树木的气候/径向生长关系

• 批准号: 298128-2013
• 负责人: Laroque, Colin
• 金额: $ 1.97万
• 依托单位: University of Saskatchewan
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=634005
• 关键词: Understanding; climate; radial; growth; relationships

Labrador trees exhibit a striking and poorly understood phenomenon: their radial growth (width of tree rings) responds more strongly to shifts in climate along east/west gradients than to north/south latitudinal variations. To fully understand these relationships, a detailed analysis of environmental characteristics and tree growth is necessary. The proposed research will take place at two sites, one directly along the coast and one farther inland. The sites have been selected with the assistance of the Innu Guardians program that has set up Innu Permanent Sample Plots (IPSP) across their traditional territory. At each site, 16 white spruce, the dominant species, will be monitored using band dendrometers, which detect tiny changes in tree expansion. Micro-cores will also be removed from the trees to help interpret how and when cells are being laid down. At the same IPSPs, detailed environmental data will be logged, and will be used in conjunction with the radial-growth data to better understand the timing of growth. Dramatic changes in climate are forecasted for the north, and local communities must learn the probable impacts on their forests. This research will: (1) Establish the precise timing of tree growth in both inland and coastal regions of northern Labrador, thereby enhancing our understanding of the complex forest ecology of the easternmost boreal forest. (2) Allow the information gained to be scaled to the larger existing grid of tree-ring sites already developed in Labrador, making possible more robust past-climate reconstructions and tree-growth forecasts. (3) Provide novel information relevant to research on treeline dynamics across the country, as dendrometers have never been utilized at the northern treeline anywhere in Canada. (4) Engage Nunatsiavut communities by involving them in the research, and by allowing them to better understand their forests and make more informed management decisions.

拉布拉多树表现出一个引人注目的和鲜为人知的现象：它们的径向生长（树木年轮的宽度）更强烈地响应气候变化沿着东/西梯度比北/南纬度变化。为了充分了解这些关系，详细分析环境特征和树木生长是必要的。拟议中的研究将在两个地点进行，一个直接沿着沿着，另一个更远的内陆。这些地点是在因努人监护人方案的协助下选定的，该方案在其传统领土上建立了因努人永久样地。在每个地点，16棵白色云杉是优势物种，将使用带状树木测量仪进行监测，这种测量仪可以检测树木扩张的微小变化。微核心也将从树上移除，以帮助解释细胞是如何以及何时被放置的。在相同的IPSP中，将记录详细的环境数据，并将与径向增长数据结合使用，以更好地了解增长的时间。据预测，北部的气候将发生剧烈变化，当地社区必须了解可能对其森林造成的影响。这项研究将：（1）建立北方拉布拉多内陆和沿海地区树木生长的精确时间，从而加强我们对最东端北方森林复杂森林生态的理解。(2)允许将获得的信息扩展到拉布拉多已经开发的更大的现有树木年轮网格，从而有可能进行更强大的过去气候重建和树木生长预测。(3)提供新的信息有关的研究在全国范围内的树线动态，树木计从来没有被用于在加拿大的北方树线的任何地方。(4)通过让努纳齐亚武特社区参与研究，让他们更好地了解自己的森林，并做出更明智的管理决策，使他们参与进来。