The University of Arizona

RSS News Feeds

Keep up to date with the Southwest Climate Change Network news feeds. Drawing on a selection of high-quality credible sources, the feeds provide quick access to new and recent stories on climate change and energy in the Southwest, cutting-edge climate change research, and climate change solutions involving policy, new technology, and the private sector.

CO2 Boosts Tree Growth Rate Longer Than Previously Thought

Date Posted: 
October 20, 2011
Publisher: 
Ecology Letters

Elevated CO2 concentration increases production and growth of developing North American forest communities, according to a new study in Ecology Letters. Science Daily reports that throughout the 12-year study, trees exposed to higher levels of CO2 grew at a higher rate than those exposed to normal levels of CO2. Previously, scientists expected that increased growth rates would last for only a short time, limited by the trees’ ability to extract nitrogen from the soil. In fact, the trees grew more small roots and microbes increased the rate of nitrogen release from decaying leaves. The researchers also tested the effects of ozone (the primary constituent of smog) on tree growth and found that despite initial declines in tree growth, by the end of the study the rates were the same for both exposed and unexposed trees.