PULLMAN, Wash.Researchers led by a Washington State University biologist have found that arid areas, among the biggest ecosystems on the planet, take up an unexpectedly large amount of carbon as levels of carbon dioxide increase in the atmosphere. The findings give scientists a better handle on the earth's carbon budgethow much carbon remains in the atmosphere as CO2, contributing to global warming, and how much gets stored in the land or ocean in other carbon-containing forms.
"It has pointed out the importance of these arid ecosystems," said R. Dave Evans, a WSU professor of biological sciences specializing in ecology and global change. "They are a major sink for atmospheric carbon dioxide, so as CO2 levels go up, they'll increase their uptake of CO2 from the atmosphere. They'll help take up some of that excess CO2 going into the atmosphere. They can't take it all up, but they'll help."
The findings, published in the journal Nature Climate Change, come after a novel 10-year experiment in which researchers exposed plots in the Mojave Desert to elevated carbon-dioxide levels similar to those expected in 2050. The researchers then removed soil and plants down to a meter deep and measured how much carbon was absorbed.
"We just dug up the whole site and measured everything," said Evans.
The idea for the experiment originated with scientists at Nevada's universities in Reno and Las Vegas and the Desert Research Institute. Evans was brought in for his expertise in nutrient cycling and deserts, while researchers at the University of Idaho, Northern Arizona University, Arizona State University and Colorado State University also contributed.
Funding came from the U.S. Department of Energy's Terrestrial Carbon Processes Program and the National Science Foundation's Ecosystem Studies Program.
The work addresses one of the big unknowns of global warming: the degree to which land-based ecosystems ab
|Contact: R. Dave Evans|
Washington State University