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Purpose of Review The search for causal mechanisms in fire ecology has been slow to progress for two main reasons. First, many fire ecology investigations often occur after fires, with no detailed information on fire behavior. These fire effects are then used to infer both fire behavior and the subsequent effects themselves. Second, that fire behavior is heterogeneous at many scales both spatially...
•It is widely assumed that post‐fire tree mortality results from necrosis of phloem and vascular cambium in stems, despite strong evidence that reduced xylem conductivity also plays an important role.
•In this study, experiments with Populus balsamifera were used to demonstrate two mechanisms by which heat reduces the hydraulic conductivity of xylem: air seed cavitation and conduit wall deformation...
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