Abstract
Context
Tree mortality is of considerable concern, but the magnitude and extent of forest canopy decline are relatively unknown in landscapes with high levels of topographic complexity, spatial heterogeneity, and species diversity. We assessed 30 years of canopy decline, including a 5-year period characterized by extreme drought, in one of North America’s most diverse landscapes in the Klamath Mountains of northern California, USA.
Objectives
(1) Characterize tree mortality by species, (2) Quantify temporal and spatial patterns of remotely-sensed canopy decline in relation to climate, (3) Compare canopy decline among vegetation types, topographic settings, and stand structural classes during drought.
Methods
We characterized tree mortality by species with field data and quantified the role of climate on canopy decline with a 30-year Landsat time series. We assessed and compared the role of topography and stand structure on canopy decline during drought.
Results
Most tree mortality and canopy decline occurred at higher elevations in Shasta red fir (Abies magnifica var. shastensis) and subalpine forests. Annual area of canopy decline was positively correlated with summer temperature and minimum vapor pressure deficit but not precipitation. The area of canopy decline was three times greater during the drought. The magnitude of decline was greatest at higher elevations, on more exposed, southwestern slopes, and in stands with old-growth structure. Stands in valleys and low slopes experienced relatively little decline.
Conclusions
Our study demonstrates the vulnerability of high elevation, old-growth forests to increasing temperature and suggests the potential for refugia from drought in diverse, heterogeneous landscapes.
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Acknowledgements
This research was funded in part through the US Forest Service (Agreement #11-CS-11051000-023) and the Agricultural Research Institute (Agreement 15-06-007). The authors would like to thank Dr. Buddhika Madurapperuma and Dr. Paul Bourdeau for their useful comments on the manuscript. Much thanks to Connor Adams, Harrison Stevens, Angelo DeMario, Arthur Grupe, Stefani Brandt, Addison Gross, Maria Friedman, Jenell Jackson, John Mola, Sam Johnson, James Adam Taylor, and Elizabeth Wu for their assistance in collecting field data.
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Bost, D.S., Reilly, M.J., Jules, E.S. et al. Assessing spatial and temporal patterns of canopy decline across a diverse montane landscape in the Klamath Mountains, CA, USA using a 30-year Landsat time series. Landscape Ecol 34, 2599–2614 (2019). https://doi.org/10.1007/s10980-019-00907-7
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DOI: https://doi.org/10.1007/s10980-019-00907-7