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Home NEWS Science News Biology

Predicting how forests in the western US will respond to changing climate

Bioengineer by Bioengineer
February 25, 2019
in Biology
Reading Time: 3 mins read
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On the mountain slopes of the western United States, climate can play a major role in determining which tree communities will thrive in the harshest conditions

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Credit: Photo is courtesy of Mike Anderegg.

Washington, DC– On the mountain slopes of the western United States, climate can play a major role in determining which tree communities will thrive in the harshest conditions, according to new work from Carnegie’s Leander Anderegg and University of Washington’s Janneke Hille Ris Lambers.

Their findings, published in Ecology Letters, are an important step in understanding how forest growth will respond to a climate altered by human activity.

As researchers try to anticipate how climate change will affect forest ecosystems, it is crucial to understand the factors that influence how forest habitats change over time–including both environmental conditions and competition for resources. One of the oldest ecological principles asserts that competition between trees will constrain growth under mild conditions and climate will constrain growth under harsh conditions.

“This question has moved from the realm of academic theory to a critical practical consideration for land managers, who are trying to determine how the ranges of different tree species will shift,” said Anderegg. “So, we wanted to test the theory across a large scale.”

He and Hille Ris Lambers studied 644 trees across 9 elevation ranges on mountain slopes in Colorado’s San Juan National Forest, Montana’s Glacier National Park, and Washington’s Olympic National Park.

They found that under the harsh conditions such as cold high elevations or dry low elevations, tree growth is constrained more by the climate than by fighting for resources, as predicted. However, under mild conditions, resource competition was not the single limiting factor that they’d predicted it would be.

“Going back to the days of naturalist explorers like Charles Darwin and Alexander von Humboldt, we have been talking about this potential tradeoff between climate-driven growth and competition-driven growth as conditions vary from harsh to mild,” Anderegg said.

The pair’s findings demonstrated that this age-old ecological theory was predictive of growth patterns under harsh conditions on the regional scale across the Western U.S. However, when climate was not limiting many other factors were in play making it difficult for forest managers to use the theory to anticipate how forest growth in mild environments might shift due to climate change.

Despite this, Anderegg and Hille Ris Lambers are optimistic that future work building off this research and introducing more factors into consideration will enable ecologists to build modeling tools that will anticipate the impact that an altered climate will have on forest ranges.

###

This research was supported by the National Science Foundation, a National Oceanographic and Atmospheric Administration Climate and Global Change postdoctoral fellowship, a UW Biology Wingfield/Ramenofsky Research Award, and a WRF Hall Research Fellowship.

The Carnegie Institution for Science (carnegiescience.edu) is a private, nonprofit organization headquartered in Washington, D.C., with six research departments throughout the U.S. Since its founding in 1902, the Carnegie Institution has been a pioneering force in basic scientific research. Carnegie scientists are leaders in plant biology, developmental biology, astronomy, materials science, global ecology, and Earth and planetary science.

Media Contact
Lee Anderegg
[email protected]

Related Journal Article

http://dx.doi.org/10.1111/ele.13236

Tags: BiologyClimate ChangeEcology/EnvironmentForestryPlant SciencesTemperature-Dependent Phenomena
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