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- W2127650028 abstract "Th is study examined the relationship between direction of treefall and slope- aspect, and prevailing wind in eight old-growth stands where single-tree canopy gaps characterize the dominant disturbance regime. All live and downed trees were inventoried in 0.45-ha sample plots. To determine crown asymmetry, crown sizes of live trees were measured along two perpendicular axes. Directions of fall and slope-aspect of downed trees also were recorded. Regional prevailing winds and wind gusts were obtained from two nearby airports. I used circular statistics to determine whether directions of treefall for each study stand had a mean direction or whether the directions of fall were uniformly distributed. If directions of treefall had a true mean, they were then compared to mean slope-aspect and mean wind directions. Mean crown asymmetry (ratio of long and short diameters) was 1.26, and there were no signifi cant diff erences in asymmetry values when current gap border trees and non- border trees were compared. At two stands, treefall directions were uniformly distributed (i.e., no mean direction). However, only one of eight stands showed a signifi cant similarity between mean slope-aspect and mean direction of fall, and only two of the eight stands showed signifi cant similarities between mean treefall and prevailing wind directions. While trees may fall downhill and downwind, the high variation in treefall and wind directions precluded establishing a consistent statistical relationship between these datasets. I suggest that crown asymmetry, resulting from diff erential crown growth on sloped hillsides as well as within canopy gaps, exerts a larger infl uence on direction of fall than either slope-aspect or wind direction." @default.
- W2127650028 created "2016-06-24" @default.
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- W2127650028 date "2011-01-01" @default.
- W2127650028 modified "2023-09-27" @default.
- W2127650028 title "Do trees fall downhill? Relationship between treefall direction and slope-aspect and wind in eight old-growth oak stands in the central hardwood forest" @default.
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