Tree-Ring Analysis Explains Physiology Behind Drought Intolerance

By Oregon State University – Re-Blogged From WUWT

CORVALLIS, Ore. – Tree rings tell the story of what’s happening physiologically as fire suppression makes forests more dense and less tolerant of drought, pests and wildfires, new research shows.

Scientists at Oregon State University and Utah State University studied 2,800 hectares of mixed-conifer forest in central Oregon, with many of the ponderosa pines in the study area dating back hundreds of years prior to 1910, when putting out wildfires became federal policy.

Other trees in the area, where fire history has been studied extensively, were younger, comparatively fire- and drought-intolerant grand firs.

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