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Separating the effects of climate and vegetation on evapotranspiration along a successional chronosequence in the southeastern US

Publication ,  Journal Article
Stoy, PC; Katul, GG; Siqueira, MBS; Juang, J-Y; Novick, KA; McCarthy, HR; Oishi, AC; Uebelherr, JM; Kim, H-S; Oren, R
Published in: GLOBAL CHANGE BIOLOGY
2006

We 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 (g(s)) 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.

Duke Scholars

Published In

GLOBAL CHANGE BIOLOGY

ISSN

1354-1013

Publication Date

2006

Volume

12

Issue

11

Start / End Page

2115 / 2135

Related Subject Headings

  • Ecology
  • 41 Environmental sciences
  • 37 Earth sciences
  • 31 Biological sciences
  • 06 Biological Sciences
  • 05 Environmental Sciences
 

Citation

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Stoy, P. C., Katul, G. G., Siqueira, M. B. S., Juang, J.-Y., Novick, K. A., McCarthy, H. R., … Oren, R. (2006). Separating the effects of climate and vegetation on evapotranspiration along a successional chronosequence in the southeastern US. GLOBAL CHANGE BIOLOGY, 12(11), 2115–2135.
Stoy, 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 Oren. “Separating the effects of climate and vegetation on evapotranspiration along a successional chronosequence in the southeastern US.” GLOBAL CHANGE BIOLOGY 12, no. 11 (2006): 2115–35.
Stoy PC, Katul GG, Siqueira MBS, Juang J-Y, Novick KA, McCarthy HR, et al. Separating the effects of climate and vegetation on evapotranspiration along a successional chronosequence in the southeastern US. GLOBAL CHANGE BIOLOGY. 2006;12(11):2115–35.
Stoy, Paul C., et al. “Separating the effects of climate and vegetation on evapotranspiration along a successional chronosequence in the southeastern US.” GLOBAL CHANGE BIOLOGY, vol. 12, no. 11, 2006, pp. 2115–35.
Stoy PC, Katul GG, Siqueira MBS, Juang J-Y, Novick KA, McCarthy HR, Oishi AC, Uebelherr JM, Kim H-S, Oren R. Separating the effects of climate and vegetation on evapotranspiration along a successional chronosequence in the southeastern US. GLOBAL CHANGE BIOLOGY. 2006;12(11):2115–2135.
Journal cover image

Published In

GLOBAL CHANGE BIOLOGY

ISSN

1354-1013

Publication Date

2006

Volume

12

Issue

11

Start / End Page

2115 / 2135

Related Subject Headings

  • Ecology
  • 41 Environmental sciences
  • 37 Earth sciences
  • 31 Biological sciences
  • 06 Biological Sciences
  • 05 Environmental Sciences