Shop Windows to the Universe

Please help support Windows to the Universe, and our activities to help Earth and space science teachers, with a tax-exempt donation today!
Warmer, drier climate may slow the release of carbon dioxide by fungi that produce mushrooms.
Click on image for full size
Image Courtesy of Steve Allison, UCI

In Alaska's Forests, Dried Mushrooms to the Rescue?
News story originally written on November 2, 2008

The fight against climate warming has an unexpected ally: mushrooms growing in dry spruce forests covering Alaska, Canada, Scandinavia and other northern regions, according to new research.

Results of the study appear online Nov. 3, 2008, in a paper in the journal Global Change Biology.

When the soil in these forests is warmed, fungi that feed on dead plant material, such as mushrooms, dry out and produce significantly less climate-warming carbon dioxide than fungi in cooler, wetter soil.

The finding came as a surprise to scientists, who expected warmer soil to emit larger amounts of carbon dioxide; extreme cold is believed to slow down the process by which fungi convert soil carbon into carbon dioxide.

"Although microbes such as fungi are among the smallest of life forms, they're also incredibly diverse and abundant," said Matt Kane, program director in the National Science Foundation (NSF)'s Division of Environmental Biology, which funded the research. "It's becoming increasingly apparent that our understanding of large-scale processes, such as how ecosystems respond to climate change, requires a greater comprehension of the biology of these small creatures."

Knowing how forests cycle carbon is crucial to accurately predicting global climate warming. This is especially important in northern forests.

Global warming is expected to hit northern latitudes hardest, raising temperatures between five and seven degrees Celsius by the year 2100.

"We don't get a vicious cycle of warming in dry, boreal forests, but instead, we get the reverse, where warming actually prevents further warming from occurring," said Steven Allison, an ecologist at the University of California at Irvine (UCI), and lead author of the paper.

Soils in the far north contain carbon from dead grasses, trees and shrubs. Like humans, fungi and bacteria in soil use plant carbon as a food source and convert it into carbon dioxide.

Allison and colleague Kathleen Treseder, also an ecologist at UCI, sought to find out what happens to carbon dioxide levels when boreal forest soil not containing permafrost is warmed.

About one-third of the world's boreal forests do not contain permafrost, which is mostly located in Alaska, Canada, Western Siberia and Northern Europe.

The scientists conducted their experiment in a spruce forest near Fairbanks, Alaska. They built small greenhouses and identified similar unheated plots nearby to serve as controls. Both plots received equal amounts of water.

In mid-May when growing season began, air and soil temperatures were the same in greenhouses and control plots. When greenhouses were closed, air temperature rose about five degrees Celsius, and soil temperature rose about one degree.

The scientists took measurements in the greenhouses and unheated plots and found that by growing season's end in mid-August, soil in warmed greenhouses produced about half as much carbon dioxide as soil in cooler control plots.

A soil analysis found that about half as much active fungi were present in experimental greenhouse samples compared with samples from the controls. When fungi dry out, they either die or become inactive and stop producing carbon dioxide, the scientists said.

"It's fortuitous for humans that the fungi are negatively affected by this warming," said Treseder. "It might help offset a little bit of the carbon dioxide we are putting directly into the atmosphere by burning fossil fuels. It's not so great, however, for the fungi."

This work was also supported by the U.S. Department of Energy and a NOAA Climate and Global Change Postdoctoral Fellowship.

Text above is courtesy of the National Science Foundation

Last modified January 27, 2009 by Becca Hatheway.

Shop Windows to the Universe Science Store!

Our online store includes books on science education, ranging from evolution, classroom research, and the need for science and math literacy!

Windows to the Universe Community

News

Opportunities

You might also be interested in:

Cool It! Game

Check out our online store - minerals, fossils, books, activities, jewelry, and household items!...more

Global Warming: Scientists Say Earth Is Heating Up

Earth’s climate is warming. During the 20th Century Earth’s average temperature rose 0.6° Celsius (1.1°F). Scientists are finding that the change in temperature has been causing other aspects of our planet...more

Carbon Dioxide - CO2

Carbon dioxide is a colorless and non-flammable gas at normal temperature and pressure. Although much less abundant than nitrogen and oxygen in Earth's atmosphere, carbon dioxide is an important constituent...more

Effects of Climate Change Today

The world's surface air temperature increased an average of 0.6° Celsius (1.1°F) during the last century according to the Intergovernmental Panel on Climate Change (IPCC). This may not sound like very...more

Triggers of Volcanic Eruptions in Oregon's Mount Hood Investigated

A new study has found that a mixing of two different types of magma is the key to the historic eruptions of Mount Hood, Oregon's tallest mountain, and that eruptions often happen in a relatively short...more

Oldest Earth Mantle Reservoir Discovered

Researchers have found a primitive Earth mantle reservoir on Baffin Island in the Canadian Arctic. Geologist Matthew Jackson and his colleagues from a multi-institution collaboration report the finding--the...more

It’s Not Your Fault – A Typical Fault, Geologically Speaking, That Is

Some geologic faults that appear strong and stable, slip and slide like weak faults. Now an international team of researchers has laboratory evidence showing why some faults that 'should not' slip are...more

Extended Period of Lower Solar Activity Linked to Changes in Sun's Conveyor Belt

A new analysis of the unusually long solar cycle that ended in 2008 suggests that one reason for the long cycle could be a stretching of the sun's conveyor belt, a current of plasma that circulates between...more

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF