Climate change causing demise of lodgepole pine
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Lodgepole pine, a hardy tree species that plays a key role in many western ecosystems in North America, is already shrinking in range as a result of climate change -- and may almost disappear from most of the Pacific Northwest by 2080, according to a new study released Monday.
Including Canada, where it is actually projected to increase in some places, lodgepole pine is expected to be able to survive in only 17 percent of its current range in the western parts of North America.
The research, published in the journal Climatic Change, was done by scientists from the College of Forestry at Oregon State University and the Department of Forest Resource Management at the University of British Columbia. It was based on an analysis of 12, 600 sites across a broad geographic range.
Lodgepole pine ecosystems occupy large areas following major fires where extreme cold temperatures, poor soils and heavy, branch-breaking snows make it difficult for other tree species to compete. This includes large parts of higher elevation sites in Oregon, Washington, the Rocky Mountains and western Canada. Yellowstone National Park is dominated by this tree species.
However, warming temperatures, less winter precipitation, earlier loss of snowpack and more summer drought already appear to be affecting the range of lodgepole pine, at the same time increasing the infestations of bark beetles that attack this tree species.
The researchers concluded that some of these forces have been at work since at least 1980, and by around 2020 will have decreased the Pacific Northwest range of lodgepole pine by eight percent. After that, continued climatic changes are expected to accelerate the species' demise. By 2080, it is projected to be almost absent from Oregon, Washington and Idaho, some of the areas facing the most dramatic changes.
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