A recent study found that an old-growth forest in China holds an unusually high amount of carbon, raising the possibility that these forests may not be carbon neutral.
Most scientists had thought old-growth forests let off as much carbon through decomposition as they absorbed from branches, leaves, and dying roots. But the new research, which appeared in a recent issue of Science, showed a 68% increase in organic carbon levels taken from samples of the top 8 inches of soil in the Dinghushan Biosphere Reserve in the Chinese province of Guangdong. The researchers studied 230 samples over a 24-year period (1979-2003).
Xuli Tang of the South China Botanical Garden, a coauthor of …
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