Human-caused climate change will most likely turn trees into gluttons, according to a new study published in the Journal Nature Communications. The study finds that elevated carbon dioxide levels in the atmosphere have increased the wood volume- or the biomass- of forests in the United States.
However, the study also clarifies that other factors like climate and pests can also affect a tree's volume. The study found that elevated carbon levels consistently led to an increase in wood volume in 10 different temperate forest groups across the country. This suggests that trees are helping to shield Earth's ecosystem from the impacts of global warming through their rapid growth.
Brent Sohngen, co-author of the study and professor of environmental and resource economics at The Ohio State University said, "Forests are taking carbon out of the atmosphere at a rate of about 13per cent of our gross emissions." Mr Sohngen added, "While we're putting billions of tonnes of carbon dioxide into the atmosphere, we're actually taking much of it out just by letting our forests grow."
This phenomenon is called carbon fertilization: An influx of carbon dioxide increases a plant's rate of photosynthesis, which combines energy from the sun, water, and nutrients from the ground and air to produce fuel for life and spurs plant growth, reported ANI.
"It's well known that when you put a ton of carbon dioxide in the atmosphere, it doesn't stay up there forever," Sohngen said. "A massive amount of it falls into the oceans, while the rest of it is taken up by trees and wetlands and those kinds of areas."
Over the last two decades, forests in the United States have sequestered about 700-800 million tonnes of carbon dioxide per year, which, according to the study, accounts for roughly 10per cent to 11 per cent of the country's total carbon dioxide emissions. While exposure to high levels of carbon dioxide can have ill effects on natural systems and infrastructure, trees have no issue gluttoning themselves on Earth's extra supply of greenhouse gas.
To put it in perspective, if you imagine a tree as just a huge cylinder, the added volume the study finds essentially amounts to an extra tree ring, Sohngen said. Although such growth may not be noticeable to the average person, compared to the trees of 30 years ago, modern vegetation is about 20per cent to 30per cent bigger than it used to be. If applied to the Coast Redwood forests - home to some of the largest trees in the world - even a modest percentage increase means a lot of additional carbon storage in forests. Researchers also found that even older large trees continue adding biomass as they age due to elevated carbon dioxide levels.
Unlike the effects of climate change, which vary over the location and in time, the amount of carbon dioxide in the atmosphere mixes almost evenly, so every place on Earth has nearly the same amount, Sohngen said.
Overall, Sohngen said this work shows that the wood volume response to carbon dioxide in our ecosystem is even higher than his colleagues predicted with experimental studies.
Sohngen said that carbon fertilization could one day make tree-growing efforts more efficient. For instance, if it costs $50 to plant one acre of trees today, with the help of carbon fertilization, that number could easily be decreased to $40. As climate change costs the United States about $2 trillion each year, that decrease could help drive down the cost of mitigating climate change, Sohngen said.
"Carbon fertilization certainly makes it cheaper to plant trees, avoid deforestation, or do other activities related to trying to enhance the carbon sink in forests," Sohngen said. "We should be planting more trees and preserving older ones because at the end of the day they're probably our best bet for mitigating climate change."
