Unravelling the effects of climate, composition and disturbance on forest productivity in the eastern boreal forest

揭示气候、成分和干扰对东部北方森林森林生产力的影响

基本信息

批准号：
RGPIN-2017-06616
负责人：
Kneeshaw, Daniel
金额：
$ 3.5万
依托单位：
Université du Québec à Montréal
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=632061
关键词：
Unravelling effects climate composition disturbance

项目摘要

Changing climate, disturbance regimes and their interactions are modifying ecosystem dynamics especially in high latitude forests; my long-term objective is to evaluate changes in decades of growth, population and community dynamics of the dominant tree species across a large region of the eastern boreal. Specifically, I will combine growth patterns derived from a province wide collection of tree ring cores to study climate sensitivity of the growth of boreal trees across large environmental gradients. We will investigate both species and site-level within species responses. Another short-term objective is to evaluate long-term changes in population (mortality vs recruitment) and community (changes in composition) dynamics of these same species along east-west (precipitation) and north-south (temperature) gradients. As insects are ectotherms they should also react strongly to warming and may interact with moisture stresses that predispose trees to increased mortality. With range expansion of the spruce budworm, an outbreaking insect, mixes of species that are rare in its traditional range will be increasing under attack. The effects of associational relationships (increased resistance vs susceptibility) in different mixes of boreal tree species will be used as a proxy for resilience to abiotic (climate) and biotic (insects) stresses in boreal forest systems at different spatial scales.

不断变化的气候，干扰制度及其相互作用正在修改生态系统动态，尤其是在高纬度森林中；我的长期目标是评估数十年来的增长，人口和社区动态的变化。具体而言，我将结合源自省广泛的树环核心的生长模式，以研究在大型环境梯度上北方树生长的气候敏感性。我们将在物种反应中研究物种和现场水平。另一个短期目标是评估这些相同物种沿东西 - 西（降水）和南北（温度）梯度的这些相同物种的人口（死亡率与招募）和社区（组成的变化）的长期变化。由于昆虫是嗜热疗法，因此它们也应该对变暖有强烈反应，并可能与使树木容易增加死亡率的水分胁迫相互作用。随着云杉芽虫的扩展（一种突发的昆虫），在其传统范围内罕见的物种的混合物将在攻击下增加。在不同空间尺度下，在北方树种的不同混合物中，北方树种混合物中的关联关系（增强的抗性与易感性）的影响将用作对非生物（气候）和生物（昆虫）应力的抗韧性的代理。