Every year, in a process known as sensation, the leaves of deciduous trees turn yellow, orange and red because they stop growing and before they fall from the tree before winter, the plant’s nutrients are absorbed. Leaf sensing also marks the end of the period during which plants absorb carbon dioxide through light modification.
Global warming results in longer growing seasons – spring leaves appear on European trees about two weeks earlier than 100 years ago, the researchers said.
“Previous models have assumed that as autumn gets warmer and warmer in the coming century, autumn will be delayed – the growing seasons will be longer overall, and autumn will be delayed by two to three weeks,” said an ecologist. Said Constantine Johner.
However, Johner and A team of researchers says their findings contradict this prediction.
Using a combination of field inspections, laboratory tests and modeling, experts over the past six decades have developed six European autumn tree species – European Horse Trees, Silver Brush, European Beech, European Lark, English Oak and English Rock. Done.
Experts found that an increase in spring and summer productivity resulting from elevated carbon dioxide, temperature and light levels drives trees to lose their leaves earlier, experts found.
It was assumed that falling temperatures and day length were the main environmental factors that led to the loss of tree leaves, Johner said. Now, researchers have identified a third factor – a “self-sustaining” productivity.
“What we’re seeing now is the third major process that is going on – (tree) productivity is regulating itself. If you’re already running in the spring and summer – if the plant absorbs more CO2 in synthesis. “Spring and summer, they lose their leaves first,” he said.
“It’s a pattern we see in humans too – if you start eating first, you’ll finish first,” he said.
“Research has shown that trees have low productivity,” Zohner said.
“We can’t put a maximum of CO2 in the atmosphere and (hopefully) trees will do much more than that – there are limits.”