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Source: The American Institute of Biological Sciences

Widespread damage from 2007 Eastern US spring freeze attributed to earlier warming

Widespread damage to plants from a sudden freeze that occurred across the Eastern United States from 5 April to 9 April 2007 was made worse because it had been preceded by two weeks of unusual warmth, according to an analysis published in the March 2008 issue of BioScience. The authors of the report, Lianhong Gu and his colleagues at the Oak Ridge National Laboratory and collaborators at NASA, the University of Missouri, and the National Oceanic and Atmospheric Administration, found that the freeze killed new leaves, shoots, flowers, and fruit of natural vegetation, caused crown dieback of trees, and led to severe damage to crops in an area encompassing Nebraska, Maryland, South Carolina, and Texas. Subsequent drought limited regrowth.

Rising levels of atmospheric carbon dioxide are believed to reduce the ability of some plants to withstand freezing, and the authors of the BioScience study suggest that global warming could lead to more freeze and thaw fluctuations in future winters. This pattern is potentially dangerous for plants because many species must acclimate to cold over a sustained period. Acclimation enables them to better withstand freezes, but unusual warmth early in the year prevents the process. A cold spring in 1996, in contrast to the 2007 event, caused little enduring damage because it was not preceded by unusual warmth.

The 2007 freeze is likely to have lasting effects on carbon balance in the region. Plants cannot resorb nutrients from dead tissue that would normally be remobilized within the plants during autumnal senescence, so many nutrients became less available for plants in 2008. Wildlife is expected to have suffered harm from lack of food, and changes to plant architecture could have long-term implications.

Gu and his colleagues propose that the 2007 spring freeze should not be viewed as an isolated event, but as a realistic climate-change scenario. Further study of its long-term consequences could help refine scenarios for ecosystem changes as carbon dioxide levels increase and the climate warms.

Full text of the article: http://www.aibs.org/bioscience-press-releases/resources/Gu.pdf

BioScience is the monthly journal of the American Institute of Biological Sciences (AIBS). BioScience publishes commentary and peer-reviewed articles covering a wide range of biological fields, with a focus on "Organisms from Molecules to the Environment." The journal has been published since 1964. AIBS is an umbrella organization for professional scientific societies and organizations that are involved with biology. It represents some 200 member societies and organizations with a combined membership of about 250,000.

The complete list of research articles in the March 2008 issue of BioScience is as follows:

Landscape Genetics.
Rolf Holderegger and Helene H. Wagner

Woody Species as Landscape Modulators annd Their Effect on Biodiversity Patterns.
Moshe Shachak, Bertrand Boeken, Elli Groner, Ronen Kadmon, Yael Lubin, Ehud Meron, Gidi Ne’eman, Avi Perevolotsky, Yehoshua Shkedy, and Eugene Ungar

Adaptive Growth Decisions in Butterflies.
Karl Gotthard

Hope for Threatened Tropical Biodiversity: Lessons from the Philippines.
Mary Rose C. Posa, Arvin C. Diesmos, Navjot S. Sodhi, and Thomas M. Brooks

Using Surrogate Species and Groups for Conservation Planning and Management.
John A. Wiens, Gregory D. Hayward, Richard S. Holthausen, and Michael J. Wisdom

The 2007 Eastern US Spring Freeze: Increased Cold Damage in a Warming World.
Lianhong Gu, Paul J. Hanson, W. Mac Post, Dale P. Kaiser, Bai Yang, Ramakrishna Nemani, Stephen G. Pallardy, and Tilden Meyers

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