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Plant production could decline as climate change affects soil nutrients
Date:10/31/2013

As drylands of the world become even drier, water will not be the only resource in short supply. Levels of nutrients in the soil will likely be affected, and their imbalance could affect the lives of one-fifth of the world's population.

That includes people living in Arizona, who may be in for a dustier future.

The findings are presented in a study published in Nature that details how soil changes may occur and discusses the implications. Co-author Matthew Bowker, assistant professor of forest soils and ecosystem ecology at Northern Arizona University, was involved with the project since 2009.

Bowker explained that most of the 17 nutrients that plants need to grow to their potential are soil resources, such as nitrogen and phosphorus. The statistical model he helped develop for the study suggests that as the climate becomes more arid, nitrogen will decrease and phosphorus will increase.

"Both are essential for plant growth, and both are typical components of fertilizer, but both need to be around in the right quantities for plant growth to proceed most efficiently," Bowker said.

"It's like a situation where you're making hamburgers but run out of beef. You can't just slip in another bun and still produce a hamburger."

Drylands, which are defined by predominantly lower levels of moisture, cover about 41 percent of the earth's surface. The study suggests that people who depend on those ecosystems for crops, livestock forage, fuel and fiber will find their resources increasingly restrained.

In Arizona, Bowker said, the projected decrease in plant production could magnify the impact of dust storms, which have been increasing in recent decades.

"We can probably expect more and more dust in the air," he said.

The project involved visits by research teams in 16 countries to 224 locations on every continent except Antarctica. Bowker led one of the sampling teams, which visited
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Contact: Eric Dieterle
eric.dieterle@nau.edu
928-523-9230
Northern Arizona University
Source:Eurekalert

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