Scientists compared recent tree growth with detailed notes from a 19th Century Ohio farmer
The study showed that leaves stayed on trees about 15% longer than they did a century agoResearchers studying hardwoods in northwest Ohio say a century of warming has extended their annual growing season by a month on average.
They say the research has implications for how well different types of trees will cope with future climate change. Our planet has warmed by 1.1C since the industrial revolution about 200 years ago. With most of that occurring in recent decades, researchers say Mikesell's observations are a near unique pre-warming dataset to compare with modern times.
Species responded to warmer temperatures in different ways - most kept their leaf colour longer into Autumn but some budded early.Trees are vital in sucking planet-warming carbon dioxide out of the atmosphere, and the researchers said a longer growing period probably meant they did more of that. But they warned that higher, fluctuating temperatures may also stress trees in ways so far unknown.
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