Eastern U.S. forests growing faster

By United Press International
Edgewater, MD (February 2, 2010)- U.S. scientists say they’ve found evidence that forests in the Eastern United States are growing faster than they have during the past 225 years. The Smithsonian Institution ecologists focused on the growth of 55 stands of mixed hardwood forest plots in Maryland. Geoffrey Parker, who has tracked the trees’ growth for 20 years, said the plots range in size with some as large as 2 acres. Parker’s research is based at the Smithsonian Environmental Research Center, 26 miles east of Washington in Edgewater, Md.


Parker and Smithsonian Tropical Research Institute postdoctoral fellow Sean McMahon said the forest is growing, on average, an additional 2 tons per acre annually. That’s the equivalent of a tree with a diameter of 2 feet sprouting up over one year, the researchers said.
Parker and McMahon said their findings suggest the faster growth rate are due to climate change and, more specifically, rising levels of atmospheric carbon dioxide, higher temperatures and longer growing seasons. The scientists, who said their findings might have significant ramifications in weather patterns, nutrient cycles, climate change and biodiversity, report the research in the Proceedings of the National Academy of Sciences.
The Proceedings of the National Academy of Sciences published the findings. Over the past 22 years, the study area saw CO2 concentration increase 12 percent, average temperature increase nearly 0.3°C, and the growing season lengthen 7.8 days.
Related Resources:
Evidence for a recent increase in forest growth
Global warming makes trees grow at fastest rate for 200 years
Urban ‘green’ spaces may contribute to global warming