气候变化领域集成服务门户(CCPortal): Disentangling mechanisms of early succession following harvest: Implications for climate change adaptation in Canada's boreal-temperate forests

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DOI	10.1016/j.foreco.2020.117926
	Disentangling mechanisms of early succession following harvest: Implications for climate change adaptation in Canada's boreal-temperate forests
	Taylor A.R.; Endicott S.; Hennigar C.
发表日期	2020
ISSN	0378-1127
卷号	461
英文摘要	Predicting forest succession is not a trivial pursuit and has remained a central challenge for scientists and foresters for well over a century. While thousands of papers have been published on the topic, contributing to a plethora of concepts and terminologies, there remains confusion over causal mechanisms, inhibiting our ability to adopt many lessons learned to sustainable forest management. Based on an emerging conceptual model of forest succession, presented here as the “Succession Triangle”, we sought to explore the relative importance of mechanisms hypothesized to drive succession following commercial harvesting across a wide landscape in the Acadian Forest Region of eastern Canada. Using machine learning techniques and repeatedly measured forest stand inventory data, including 19,332 forest stands measured over a ≈30 year period, we uncovered dominant early succession pathways and investigated key mechanisms driving these pathways. Overall, our results show stands may follow multiple succession pathways following harvesting, including early dominance by so-called “late-succession” species (e.g., black spruce and sugar maple), depending on causal mechanisms. More specifically, mechanisms related to the state of the environment (primarily climate) and differential species availability (mainly pre- and post-harvest overstorey composition) had the strongest control over early succession. The strong influence of pre-harvest composition on early succession supports the ‘direct regeneration’ hypothesis; while the importance of post-harvest overstorey composition suggests the use of partial-cutting as a means of regenerating shade-tolerant species (e.g., sugar maple and red spruce). Site conditions (i.e., slope and drainage) influenced the direction of succession, but landscape-level variation in climate had the overall strongest effect, with colder, more moist climates promoting regeneration of balsam fir, while warmer, dryer climates encouraged shade-intolerant, broadleaf species (birches, red maple and poplars), especially following clear-cutting. Given the strong influence of climate, we used our fitted model to predict the impact of late 21st century climate change on early succession using the “business-as-usual” RCP 8.5 radiative forcing scenario. Our results indicate climate change is likely to increase the regeneration of shade-intolerant, broadleaf tree species (e.g., red maple and poplars) across the landscape at the loss of cold-adapted balsam fir, supporting the hypothesis that young, post-harvest stands are vulnerable to climate-driven shifts in composition as postulated by ‘resilience theory’, and corroborating previous simulation studies that predict rapid 21st century climate warming will lead to ‘deborealization’ of Canada's Acadian Forest Region. © 2020
关键词	Atmospheric radiation Climate models Digital storage Forecasting Harvesting Learning systems Mechanisms Plants (botany)Reforestation Climate change adaptation Direct regeneration Machine learning techniques Partial cutting Radiative forcings Regeneration Succession Sustainable forest management Climate change adaptive management boreal forest climate change cutting (process)dominance forest inventory forest management forestry regeneration succession sustainability temperate forest timber harvesting Abies Lasiocarpa Acer Rubrum Tridens Cutting Forecasts Harvesting Reforestation Sustainable Forest Management Acadia Canada Abies balsamea Acer rubrum Acer saccharum Betula Picea mariana Picea rubens Populus
语种	英语
来源机构	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132978
推荐引用方式 GB/T 7714	Taylor A.R.,Endicott S.,Hennigar C.. Disentangling mechanisms of early succession following harvest: Implications for climate change adaptation in Canada's boreal-temperate forests[J]. Forest Ecology and Management,2020,461.
APA	Taylor A.R.,Endicott S.,&Hennigar C..(2020).Disentangling mechanisms of early succession following harvest: Implications for climate change adaptation in Canada's boreal-temperate forests.,461.
MLA	Taylor A.R.,et al."Disentangling mechanisms of early succession following harvest: Implications for climate change adaptation in Canada's boreal-temperate forests".461(2020).