期刊
ECOLOGY LETTERS
卷 25, 期 5, 页码 1126-1138出版社
WILEY
DOI: 10.1111/ele.13978
关键词
canopy gaps; disturbance; drones; forest carbon; forest dynamics; forest structure; photogrammetry; tropical forest
类别
资金
- U.S. Department of Energy, Office of Science, Office of Biological and Environmental Research
This study used drone photogrammetry to measure spatial variation in canopy disturbance rates in a 1500 ha forest in Central Panama. The results showed that soil type, forest age, and topography were the main predictors of disturbance rate variation.
Tree mortality is a major control over tropical forest carbon stocks globally but the strength of associations between abiotic drivers and tree mortality within forested landscapes is poorly understood. Here, we used repeat drone photogrammetry across 1500 ha of forest in Central Panama over 5 years to quantify spatial variation in canopy disturbance rates and its predictors. We identified 11,153 canopy disturbances greater than 25 m(2) in area, including treefalls, large branchfalls and standing dead trees, affecting 1.9% of area per year. Soil type, forest age and topography explained up to 46%-67% of disturbance rate variation at spatial grains of 58-64 ha, with higher rates in older forests, steeper slopes and local depressions. Furthermore, disturbance rates predicted the proportion of low canopy area across the landscape, and mean canopy height in old growth forests. Thus abiotic factors drive variation in disturbance rates and thereby forest structure at landscape scales.
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