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Conservation Science for a Healthy Planet

Plants retain more water with more CO2 in environment—implications for current drought and hydrology studies

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http://phys.org/news/2016-08-climate-impact-drought-previously.html#jCp

August 29, 2016

As a multiyear drought grinds on in the Southwestern United States, many wonder about the impact of global climate change on more frequent and longer dry spells. As humans emit more carbon dioxide into the atmosphere, how will water supply for people, farms, and forests be affected? A new study from the University of California, Irvine and the University of Washington shows that water conserved by plants under high CO2 conditions compensates for much of the effect of warmer temperatures, retaining more water on land than predicted in commonly used drought assessments.

According to the study published this week in the Proceedings of the National Academy of Sciences, the implications of plants needing less water with more CO2 in the environment changes assumptions of climate change impacts on agriculture, water resources, wildfire risk, and plant growth.

The study compares current drought indices with ones that take into account changes in plant water use. Reduced precipitation will increase droughts across southern North America, southern Europe and northeastern South America. But the results show that in Central Africa and temperate Asia—including China, the Middle East, East Asia and most of Russia—water conservation by plants will largely counteract the parching due to climate change. “This study confirms that drought will intensify in many regions in the future,” said coauthor James Randerson, UCI professor of Earth system science. “It also shows that plant water needs will have an important influence on water availability, and this part of the equation has been neglected in many drought and hydrology studies.”…

Global climate models already account for these changes in plant growth. But many estimates of future drought use today’s standard indices, like the Palmer Drought Severity Index, which only consider atmospheric variables such as future temperature, humidity and precipitation. “New satellite observations and improvements in our understanding hydrological cycle have led to significant advances in our ability to model changes in soil moisture,” said Randerson. “Unfortunately, using proxy estimates of drought stress can give us misleading results because they ignore well-established principles from plant physiology.

Is this good news for climate change? Although the drying may be less extreme than in some current estimates, droughts will certainly increase, researchers said, and other aspects of climate change could have severe effects on vegetation. “There’s a lot we don’t know, especially about hot droughts,” Swann said. The same drought at a higher temperature might have more severe impacts, she noted, or might make plants more stressed and susceptible to pests. “Even if droughts are not extremely more prevalent or frequent, they may be more deadly when they do happen,” she said.

Abigail L. S. Swanna,b,1, Forrest M. Hoffmanc,d, Charles D. Kovene, and James T. Randersonf
lant responses to increasing CO2 reduce estimates of climate impacts on drought severity, Proceedings of the National Academy of Sciences, www.pnas.org/cgi/doi/10.1073/pnas.1604581113

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