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Drop in Rain Forest Productivity Could Speed Future Climate Change

Justin Rowell by Justin Rowell
29.09.2022
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La Selva Biological Station, located in Costa Rica.

Source: Journal of Geophysical Research: Biogeosciences

Tropical forests host a rich diversity of plant and animal life and process vast amounts of carbon dioxide (CO2). Therefore, researchers have been particularly interested in how these ecosystems might be affected by climate change. Some have hypothesized that the rise in atmospheric CO2 is promoting carbon uptake by these forests, making them important carbon sinks. Evidence is mounting, however, that the balance of cost and benefit is reaching a tipping point, and global warming will soon hinder tropical forests’ ability to soak up carbon.

In a new study, Clark et al. assessed tropical forests’ annual net primary productivity from 1997 to 2018. They measured wood growth and litterfall in 18 plots in Costa Rica’s La Selva Biological Station. The scientists collected litterfall every other week from basket traps and annually measured the growth of all live stems greater than 10 centimeters in diameter. They found that the stress associated with hotter temperatures outweighed the benefits of increased carbon dioxide. Annual aboveground net primary production fluctuated greatly year to year, but no productivity component increased over the 21 years. Twig litterfall declined, and wood production suffered in years with slightly warmer nights and with particularly hot dry seasons.

The new research provides further evidence that as nighttime temperatures continue rising and as more daytime hours exceed the optimum temperature for photosynthesis, productivity will decline. The authors warn that tropical forests could soon enter into a positive feedback loop that accelerates both global warming and tropical forest decline. As forests become less productive because of rising temperatures, they will soak up less carbon dioxide, which in turn will lead to more warming. This cycle could pose a major threat to the survival of these highly biodiverse ecosystems. (Journal of Geophysical Research: Biogeosciences, https://doi.org/10.1029/2021JG006557, 2021)

—Rachel Fritts, Science Writer

Citation: Fritts, R. (2022), Drop in rain forest productivity could speed future climate change, Eos, 103, https://doi.org/10.1029/2022EO220028. Published on 12 January 2022.

Text © 2022. AGU. CC BY-NC-ND 3.0
Except where otherwise noted, images are subject to copyright. Any reuse without express permission from the copyright owner is prohibited.


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