In the Northeastern U.S., trees around the edges of urban forests grow faster, and the soil gives off less carbon dioxide, than scientists expected and may play an outsized role in combating climate change:
Percentage of forest area within 30 meters of a human-made edge.
"Pollution is a good and a bad thing from a plant's perspective," said Hutyra."Some of that pollution is definitely not what the forest would want, but some of it is carbon dioxide, which will stimulate growth, and some of it is reactive nitrogen, which serves as a fertilizerA separate study published Wednesday in Global Change Biology found that the soil around these urban forest edges emitted carbon dioxide 25% slower than soil deeper in the woods.
"Urban soils are experiencing really high temperatures. And so we would expect, if it's really hot, that they would respire more. But that doesn't seem to be the case," she said.Even without understanding the nuts and bolts of what's happening, the finding is still noteworthy.
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