Uncovering the Secrets of the Rainforest Canopy: How GEDI is Changing Our Understanding
Key Highlights :
The rainforest canopy is home to some of the world’s most diverse and unique ecosystems, yet it is one of the least explored areas on the planet. We know less about the rainforest canopy, where most of the world's species live, than we do about the surface of Mars or the bottom of the ocean. However, that is about to change thanks to GEDI—a NASA space laser that has provided a detailed structure of the world's rainforests for the first time ever.
A recently published paper in Environmental Research Ecology details the laser's findings, and is authored by researchers from the U.S., the U.K. and Singapore. The paper's first author, Christopher Doughty, professor in Northern Arizona University's School of Informatics, Computing, and Cyber Systems, believes this research is crucial—and long overdue—in finding out more about the tropical ecosystems.
"Most of the world's species live in tropical forests and most of those make use of the canopy, and yet, we know so little," Doughty said. "Rainforest structure matters because it controls how animals access resources and escape predators, and these findings will help us understand tropical forest animal's susceptibility to climate change."
Research into forest canopies has come a long way. Early western visitors described tropical forests as horror vacui (nature abhorring a vacuum) since vegetation was "anxious to fill every available space with stems and leaves." Later, as scientists began to study tropical forests, they categorized the lush flora into forest layers—a thick upper crown and a thick mid-layer with a thin layer in between. However, this was only observed in a few well-studied locations. The structure across most tropical forests was still unknown.
Then came GEDI, the Global Ecosystem Dynamics Investigation. Launched in late 2018, NASA's GEDI shoots an invisible laser from the International Space Station into Earth's forests thousands of times a day. Depending on the amount of energy returned to the satellite, it can provide a detailed 3D map that shows where the leaves and branches are in a forest and how they change over time. This will help researchers understand the amounts of biomass and carbon forests store and how much they lose when disturbed—vital information for understanding Earth's carbon cycle and how it is changing.
Doughty, Tang and the other authors of the paper analyzed GEDI data across all tropical forests and found that the structure was simpler and more exposed to sunlight than previously thought. Data also revealed that most tropical forests (80% of the Amazon and 70% of Southeast Asia and the Congo Basin) have a peak in the number of leaves at 15 meters instead of at the canopy top, debunking the fullest-at-the-top theory of early researchers. While forests vary, a key finding that seemed to remain constant in every scenario was that deviation from more ideal conditions (like lower fertility or higher temperatures) leads to shorter, less stratified forests with lower biomass.
"It was really surprising to see the dominance of this structure type because it differs from what we had learned in the classic textbooks on the topic," Doughty said. "These finding will not only help us understand how the millions of species that live in a rainforest canopy might acclimate to changing temperatures, but also how much carbon these forests hold and how good they are at fighting climate change."
The data collected by GEDI has revolutionized our understanding of the rainforest canopy and the species that inhabit it. With a clearer picture of the structure and function of these forests, researchers can better understand the effects of climate change on these ecosystems and the species that rely on them. The data collected by GEDI will help researchers continue to uncover the secrets of the rainforest canopy and protect these vital ecosystems for years to come.
