Climate sensitivity of understory trees differs from overstory trees in temperate mesic forests.

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ID: 264417
2020
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Abstract
The response of understory trees to climate variability is key to understanding current and future forest dynamics. However, analyses of climatic effects on tree growth have primarily focused on the upper canopy, leaving understory dynamics unresolved. We analyzed differences in climate sensitivity based on canopy position of four common tree species (Acer rubrum, Fagus grandifolia, Quercus rubra, and Tsuga canadensis) using growth information from 1,084 trees across eight sites in the northeastern United States. Effects of canopy position on climate response varied, but were significant and often nonlinear, for all four species. Compared to overstory trees, understory trees showed stronger reductions in growth at high temperatures and varied shifts in precipitation response. This contradicts the prevailing assumption that climate responses, particularly to temperature, of understory trees are buffered by the overstory. Forest growth trajectories are uncertain in compositionally and structurally complex forests, and future demography and regeneration dynamics may be misinferred if not all canopy levels are represented in future forecasts.
Reference Key
rollinson2020climateecology Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Rollinson, Christine R;Alexander, M Ross;Dye, Alex W;Moore, David J P;Pederson, Neil;Trouet, Valerie;
Journal Ecology
Year 2020
DOI
10.1002/ecy.3264
URL
Keywords
forest structure canopy position climate-growth relationship generalized additive models tree rings

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