d Plants require more forcing at low chilling d Will changes in phenology track climate change A study of growth initiation timing in coast Douglasfir Kevin R Ford kevinrfordfsfedus ID: 467154
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Plants require more forcing at low chilling
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Will changes in phenology track climate change?
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study of growth initiation timing in coast Douglas-fir
Kevin R. Ford (
kevinrford@fs.fed.us),
Constance A. Harrington, Sheel Bansal USDA Forest Service Pacific Northwest Research Station
Introduction
The timing of annual growth initiation in plants has large impacts on species distributions and ecosystem function, and is sensitive to climateWarmer spring temperatures that trigger the beginning of growth and have generally led to earlier growth initiation in temperate plantsBut many species also require exposure to cool temperatures (“chilling”) as well as warm temperatures (“forcing”) during the winter/spring to initiate growth in sync with favorable climatic conditions Warmer winters could disrupt this process and prevent plants from tracking climate change
Study designturtleWe studied height- and diameter-growth initiation timing in coast Douglas-fir by combining data from 9 climatically diverse field sites (where plants experienced medium to large amounts of chilling) and greenhouse studies (where we manipulated the amount of chilling plants experienced from low to medium).
Calculating chilling and forcing units
Climate change and phenological responses together determine growing conditions plants experience
Conclusions
In the higher latitude/elevation portions of the coast Douglas-fir range, climate change will likely lead to earlier growth initiation, with plants tracking shifts in the onset of favorable climatic conditionsHowever, towards lower latitude/elevation range limits, climate change could lead to delayed growth initiation and plants failing to track shifts in the timing of favorable conditionsThese maladaptive phenological responses could reduce the resilience of coast Douglas-fir to climate change near the warm edges of its range
Climate change affects growth initiation timing differently across the range
Study map
My website: kevinford.weebly.com
Photo credit: Teresa Vail
Diameter-growth initiation:
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Height-growth initiation: