Researchers warn that drought puts Amazon at risk of “massive dieback”

Increasing climatic conditions accelerate the “massive dieback” of Amazon rainforests, according to the authors of a new study that found 2.5 billion trees dead in biomes after a drought a few years ago. There is a risk of causing it.

Central Brazil is now Worst drought In 100 years, it has created the risk of water shortages and power outages. The southern part of the world’s largest rainforest is projected to be affected by dry spells later this year.

A joint group of British and Brazilian scientists say that the loss of trees caused by these extremely dry spells pushes rainforests beyond the so-called “turning point,” the threshold at which water cycle ecosystems can no longer be maintained. I warn you that there is a possibility. This will destroy more trees and cause rapid climate change throughout Latin America.

“As droughts become more common and severe, this means more tree mortality and less water being recycled, which can lead to large-scale diebacks,” Oxford said. Erica Berengel, a Brazilian researcher at the University and Lancaster University, said.

In an eight-year study published Monday, Berengel’s team found more than 2.5 billion trees and wood vines in the areas most affected by the rainforest after the 2015-16 El Nino drought and wildfire. It was discovered that it caused the death of the plant.

By comparison, the US Forest Office estimates that since 2010, 129m of trees have died in California due to droughts and wildfires.

Deforestation has emitted about 500 million tonnes of carbon dioxide, according to studies in the United Kingdom and Brazil. Tree mortality was also higher than expected during the three years following the drought.

“Three years later, only about one-third of the emissions were reabsorbed by forest plant growth. This is because Amazon’s important function as a carbon sink is years after these droughts. It shows that it can be hindered during the period, “said the researchers.

Scientists have generally been worried that the Amazon might cross that “turning point” as a result of the surge in human-led deforestation during the right-wing Jair Bolsonaro administration in Brazil. Some environmental activists also believe that the country’s ongoing drought is directly linked to the Amazon’s surge in deforestation.

Rainforests have long been regarded as an important buffer against climate change, with billions of trees serving as huge sinks for carbon emissions.

However, a series of new studies, including one published last week NatureSuggests that as a result of deforestation and farmers’ use of fire to clear land, they are releasing more carbon than some of the biomes are absorbing.

Berenguer also emphasized that dry forests make them more susceptible to fires by farmers. She said this causes six times more carbon emissions than trees affected only by drought.

The study was conducted by collecting data from 21 plots of primeval, secondary regrowth and logging forests, and the results were extrapolated to the area.

Researchers warn that drought puts Amazon at risk of “massive dieback”

Source link Researchers warn that drought puts Amazon at risk of “massive dieback”

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