Interactive effects of ozone and climate on water use, soil moisture content and streamflow in a southern Appalachian forest in the USA

doi:10.1111/j.1469-8137.2007.01970.x

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Wiley InterScience

New Phytologist

Volume 174 Issue 1, Pages 125 - 136

Published Online: 2 Mar 2007

Published on behalf of the New Phytologist Trust

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Interactive effects of ozone and climate on water use, soil moisture content and streamflow in a southern Appalachian forest in the USA

S. B. McLaughlin ^1,2 , S. D. Wullschleger ² , G. Sun ³ and M. Nosal ⁴

¹ Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN, USA; ² Oak Ridge National Laboratory, Environmental Sciences Division, Oak Ridge, TN, USA; ³ US Forest Service, Southern Global Change Program, Raleigh, NC, USA; ⁴ Department of Mathematics and Statistics, University of Calgary, Calgary, Alberta, Canada

Author for correspondence: S. B. McLaughlin Tel: +1 540 348 4342 Fax: +1 540 348 4342 Email: lochlainnsbp@earthlink.net

KEYWORDS

Appalachia • climate • forests • ozone • soils • streamflow • water use

New Phytologist (2007) 174: 125 –136

doi: 10.1111/j.1469-8137.2007.01970.x

ABSTRACT

•
Documentation of the degree and direction of effects of ozone on transpiration of canopies of mature forest trees is critically needed to model ozone effects on forest water use and growth in a warmer future climate.
•
Patterns of sap flow in stems and soil moisture in the rooting zones of mature trees, coupled with late-season streamflow in three forested watersheds in east Tennessee, USA, were analyzed to determine relative influences of ozone and other climatic variables on canopy physiology and streamflow patterns.
•
Statistically significant increases in whole-tree canopy conductance, depletion of soil moisture in the rooting zone, and reduced late-season streamflow in forested watersheds were detected in response to increasing ambient ozone levels.
•
Short-term changes in canopy water use and empirically modeled streamflow patterns over a 23-yr observation period suggest that current ambient ozone exposures may exacerbate the frequency and level of negative effects of drought on forest growth and stream health.

Received: 13 September 2006 Accepted: 2 November 2006

DIGITAL OBJECT IDENTIFIER (DOI)

10.1111/j.1469-8137.2007.01970.x About DOI