Anderegg: “We’ve known for decades that drought has harmful effects on trees. That during drought they grow slower and they have a higher chance of death.”

Drought-starved trees show effects years after drought ends. Click To Tweet

That’s William Anderegg, a biologist at the University of Utah. He says until recently, researchers were not clear about what happened to the trees after a drought ended.

So his team looked at the growth of trees after severe drought in more than a thousand forests across North America, Europe, and Asia. They found that even four years after a drought, trees continued to grow more slowly than normal.

Anderegg: “Trees take up about a quarter of human emissions of CO2 each year, and that’s a very big slowing effect on climate change. So if droughts cause forests to take up less carbon, that could very much speed up the pace and the severity of climate change.”

Anderegg says it is too early to know what the long-term implications will be.

Pine forest

Anderegg: “Some of our best models suggest that forests could be relatively resilient and others suggest they could really die off en masse and lose a lot of their carbon to the atmosphere. And we don’t know which of those is more likely.”

But Anderegg says that the future of the world’s forests is still in our hands.

Anderegg: “I always like to emphasize that a lot of that future does depend on human decisions and what we do about climate change.”

Reporting credit: ChavoBart Digital Media.
Photo: Pine forest (copyright protected).

More Resources
Drought damages trees’ ability to store carbon
Drought’s lasting impact on forests
Pervasive drought legacies in forest ecosystems and their implications for carbon cycle models

Topics: Food & Agriculture, Weather Extremes