NASA’s Global Ecosystem Dynamics Investigation (GEDI) has provided new insights into the impact of climate change on tropical forests. The study, published in the Proceedings of the National Academy of Sciences (PNAS), analyzed changes in tropical forest canopy height using laser measurements from GEDI. The research team studied a wide range of forests in Asia, Africa, and South America, focusing on areas with minimal human disturbances.
The lead author, Shaoqing Liu, explained that taller canopies are associated with higher carbon storage and greater above-ground biomass, which can help buffer the microclimate. The study found that climate, topography, and soil properties account for nearly three-quarters of tropical forest canopy height variation. Prolonged dry seasons and elevation were key factors affecting canopy height, especially in the southern Amazon region.
Impact on tropical forest canopies
As global climate models predict longer dry seasons, the study warns of potential significant reductions in canopy height in these regions. Paul Moorcroft, senior author of the study, emphasized the importance of space-based remote sensing in evaluating new forms of measurement.
Liu wanted to extend the research beyond primary forests to examine more of the globe’s forest and woodland areas. He hopes such studies will inform climate-change policies, highlighting the role of tropical forests as biodiversity hotspots and critical carbon storage areas. The study demonstrates the significance of understanding the environmental controls of tropical forest height for assessing carbon sequestration and conservation value.
Protecting these forests is crucial for mitigating climate change and preserving biodiversity.
Image Credits: Photo by Chris Abney on Unsplash
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