Climate shifts spell trouble for walnut trees

PURDUE (US) — Warmer, drier summers and extreme weather events considered possible as the climate changes would be especially troublesome—possibly fatal—for walnut trees, according to new research.

Scientists have found that the trees are especially sensitive to particular climates.

Over five years, Douglass Jacobs, a professor of forestry and natural resources at Purdue University, and Martin-Michel Gauthier, a research scientist in the Ministry of Natural Resources in Quebec, studied the physiology of walnut trees, which are economically significant in Indiana for their lumber and veneer, and in other areas for their nuts.

Douglass Jacobs is concerned that warmer, drier weather conditions predicted in climate change scenarios could have adverse effects on walnut trees. (Credit: Tom Campbell, Purdue Agricultural Communication)


“Walnut is really restricted to sites not too wet or dry. It has an extremely narrow range,” says Jacobs, whose findings were published in the journal Annals of Forest Science. “We suspect and predict that climate change is going to have a real impact on walnuts. We may see some type of decline of the species.”

Specifically, walnuts would have difficulty tolerating droughts that could be associated with a changing climate.

“Changes in moisture could restrict its ability to survive without irrigation,” Jacobs says. “Almost all climate change models predict that climates will become drier.”

Walnuts are also sensitive to cold, so much so that they have developed a defense mechanism against late frosts. Jacobs says walnut trees don’t begin sprouting leaves until almost a month after other trees in the spring.

That defense mechanism could be compromised by extreme weather events associated with climate change scenarios. Late spring frosts after walnuts have developed leaves could kill trees.

“That, on top of the increase in temperatures, would be a problem for walnut,” Gauthier says. “The trees would basically shut down.”

In California, more than 500,000 tons of walnuts were sold for more than $1 billion in 2010, according to the U.S. Department of Agriculture.

In Indiana, black walnuts are prized for their wood. Charles Michler, project leader of Purdue’s Hardwood Tree Improvement and Regeneration Center, says walnuts accounted for as much as 15 percent of the logs sold in Indiana, at a value of about $11 million.

“Walnut is probably the most important species in the hardwood products industry today,” Michler says.

The center has a walnut breeding program that is attempting to identify trees that can be used in different climates, he says.

One goal is to find walnuts that may be able to stand up to the heat or cold stresses that trees could be subject to in a changing climate. The center is looking at seeds that come from mature trees to see if the seeds have attained defense mechanisms against changes already seen in climate.

“That could be the strategy that trees have,” Michler says. “The trees that are mature now may be affected by climate change, but the seeds they produce may be adapting through genetic changes.”

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