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Geomorphic transience moderates topographic controls on tropical canopy foliar traits
K Dana Chadwick1,2, Gregory P Asner3
1Department of Earth System Science, Stanford University, Stanford, CA, USA.
Ecology Letters
|May 27, 2020
Summary
Mountainous tropical ecosystems show high biodiversity. Varying erosion rates, driven by landscape evolution, significantly influence forest canopy traits and functional diversity along tropical hillsides.
Area of Science:
- Ecology
- Geomorphology
- Biogeochemistry
Background:
- Tropical ecosystems in mountainous terrain exhibit high species and functional diversity.
- Landscape morphology is dynamic, with stream channels responding to mountain uplift through erosion.
- Assessing catchment-level landscape evolution is possible with lidar-based models, but impacts on biogeochemical gradients and canopy traits remain unclear.
Discussion:
- This study investigates how variable erosion rates within catchments affect hillslope controls on canopy traits on Mt. Kinabalu, Borneo.
- Canopy trait maps were utilized to analyze these relationships across diverse climatic and geochemical conditions.
- The research explores the influence of geomorphic processes on forest functional diversity.
Key Insights:
- Foliar nutrient content generally increased along hillslopes.
- These relationships were moderated by catchment responses to erosion pressure.
- Active stream channel downcutting correlated with greater turnover in canopy traits along hillslopes.
Outlook:
- Understanding geomorphic controls on forest functional diversity is crucial for predicting ecosystem responses to landscape change.
- Further research can refine models linking landscape evolution to biogeochemical gradients and canopy trait organization.
- This work provides a foundation for managing tropical mountain biodiversity under dynamic environmental conditions.
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