Drought resistance and drought adaptation of Douglas-fir (Pseudotsuga menziesii) – A review

作者：Christoph Leuschner, Frederick C. Meinzer · 发表于：Perspectives in Plant Ecology Evolution and Systematics · 年份：2024 · DOI：10.1016/j.ppees.2024.125829 · 被引用次数：27 · 研究领域：Forest ecology and management、Plant Water Relations and Carbon Dynamics、Fire effects on ecosystems

The rise in temperatures with climate warming exposes trees and forests on Earth to a triple threat through increased soil drought, enhanced atmospheric drought, and growing heat stress. Understanding which tree species are susceptible to mortality under a more arid future climate is urgent. Here, we review recent progress in our understanding of the drought and heat response of Douglas-fir ( Pseudotsuga menziesii , DF) in all relevant fields of research, spanning from stomatal regulation and photosynthetic responses, plant water status dynamics and the vulnerability of the hydraulic system , to adaptive responses of the root system , the climate sensitivity of growth, and climate change-related tree vitality declines and die-off. The species’ high productivity is linked to large leaf areas at maturity, which cause fairly high interception and transpiration rates and often result in effective soil moisture depletion and reduced groundwater recharge . While hydraulic safety is high in DF branch xylem, embolism seems common in the xylem of terminal branchlets and small roots during summer drought. The existing evidence suggests that the photosynthetic apparatus and growth rate of DF are fairly heat-sensitive in comparison to other tree species, with impairment of photosynthesis starting at temperatures of ∼40 °C. A key growth-limiting factor is a high atmospheric saturation deficit, which causes partial stomatal closure and growth decline in summer, explaining high productivity...