Future forests may help to buffer climate change
Friday, December 09, 2011
North American forests appear to have a greater capacity to soak up heat-trapping carbon dioxide gas than researchers had previously anticipated.
As a result, they could help slow the pace of human-caused climate warming more than most scientists had thought, microbial ecologist Don Zak and his colleagues have concluded.
The results of a 12-year study at an experimental forest in northeastern Wisconsin challenge several long-held assumptions about how future forests will respond to the rising levels of atmospheric carbon dioxide blamed for human-caused climate change, said Zak, lead author of a paper published Oct. 14, 2011 in Ecology Letters.
"Some of the initial assumptions about ecosystem response are not correct and will have to be revised," said Zak, a professor at the U-M School of Natural Resources and Environment and the Department of Ecology and Evolutionary Biology.
To simulate atmospheric conditions expected in the latter half of this century, Zak and his colleagues continuously pumped extra carbon dioxide into the canopies of trembling aspen, paper birch and sugar maple trees at a 38-acre experimental forest in Rhinelander, Wis., from 1997 to 2008.
Some of the trees were also bathed in elevated levels of ground-level ozone, the primary constituent in smog, to simulate the increasingly polluted air of the future. Both parts of the federally funded experiment the carbon dioxide and the ozone treatments produced unexpected results.
"The interesting take home point with this is that aspects of biological diversity like genetic diversity and plant species compositions are important components of an ecosystem's response to climate change," he said. "Biodiversity matters, in this regard."
Read more in the U-M News Service press release
In this article: