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dc.contributor.authorStoy, Paul C.
dc.contributor.authorKatul, Gabriel G.
dc.contributor.authorSiqueira, Mario B. S.
dc.contributor.authorJuang, Jehn-Yih
dc.contributor.authorNovick, Kimberly A.
dc.contributor.authorMcCarthy, Heather R.
dc.contributor.authorOishi, A. Christopher
dc.contributor.authorUebelherr, Joshua M.
dc.contributor.authorKim, Hyun-Seok
dc.contributor.authorKim, Ram
dc.identifier.citationStoy, Paul C., Gabriel G. Katul, Mario B. S. Siqueira, Jehn-Yih Juang, Kimberly A. Novick, Heather R. McCarthy, A. Christopher Oishi, Joshua M. Uebelherr, Hyun-Seok Kim, and Ram Kim(2006) Separating the effects of climate and vegetation on evapotranspiration along a successional chronosequence in the southeastern U.S. Global Change Biology 12: 2115-2135. DOI: 10.1111/j.1365-2486.2006.01244.x.en_US
dc.description.abstractWe combined Eddy‐covariance measurements with a linear perturbation analysis to isolate the relative contribution of physical and biological drivers on evapotranspiration (ET) in three ecosystems representing two end‐members and an intermediate stage of a successional gradient in the southeastern US (SE). The study ecosystems, an abandoned agricultural field [old field (OF)], an early successional planted pine forest (PP), and a late‐successional hardwood forest (HW), exhibited differential sensitivity to the wide range of climatic and hydrologic conditions encountered over the 4‐year measurement period, which included mild and severe droughts and an ice storm. ET and modeled transpiration differed by as much as 190 and 270 mm yr−1, respectively, between years for a given ecosystem. Soil water supply, rather than atmospheric demand, was the principal external driver of interannual ET differences. ET at OF was sensitive to climatic variability, and results showed that decreased leaf area index (L) under mild and severe drought conditions reduced growing season (GS) ET (ETGS) by ca. 80 mm compared with a year with normal precipitation. Under wet conditions, higher intrinsic stomatal conductance (gs) increased ETGS by 50 mm. ET at PP was generally larger than the other ecosystems and was highly sensitive to climate; a 50 mm decrease in ETGS due to the loss of L from an ice storm equaled the increase in ET from high precipitation during a wet year. In contrast, ET at HW was relatively insensitive to climatic variability. Results suggest that recent management trends toward increasing the land‐cover area of PP‐type ecosystems in the SE may increase the sensitivity of ET to climatic variability.en_US
dc.rightsThis Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).en_US
dc.titleSeparating the effects of climate and vegetation on evapotranspiration along a successional chronosequence in the southeastern U.S.en_US
mus.citation.journaltitleGlobal Change Biologyen_US
mus.identifier.categoryLife Sciences & Earth Sciencesen_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.departmentLand Resources & Environmental Sciences.en_US
mus.relation.universityMontana State University - Bozemanen_US

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