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Canopy conductance of Pinus taeda, Liquidambar styraciflua and Quercus phellos under varying atmospheric and soil water conditions.

Publication ,  Journal Article
Pataki, DE; Oren, R; Katul, G; Sigmon, J
Published in: Tree physiology
May 1998

Sap flow, and atmospheric and soil water data were collected in closed-top chambers under conditions of high soil water potential for saplings of Liquidambar styraciflua L., Quercus phellos L. and Pinus taeda L., three co-occurring species in the southeastern USA. Responses of canopy stomatal conductance (g(t)) to water stress induced by high atmospheric water vapor demand or transpiration rate were evaluated at two temporal scales. On a diurnal scale, the ratio of canopy stomatal conductance to maximum conductance (g(t)/g(t,max)) was related to vapor pressure deficit (D), and transpiration rate per unit leaf area (E(l)). High D or E(l) caused large reductions in g(t)/g(t,max) in L. styraciflua and P. taeda. The response of g(t)/g(t,max) to E(l) was light dependent in L. styraciflua, with higher g(t)/g(t,max) on sunny days than on cloudy days. In both L. styraciflua and Q. phellos, g(t)/g(t,max) decreased linearly with increasing D (indicative of a feed-forward mechanism of stomatal control), whereas g(t)/g(t,max) of P. taeda declined linearly with increasing E(l) (indicative of a feedback mechanism of stomatal control). Longer-term responses to depletion of soil water were observed as reductions in mean midday g(t)/g(t,max), but the reductions did not differ significantly between species. Thus, species that employ contrasting methods of stomatal control may show similar responses to soil water depletion in the long term.

Duke Scholars

Published In

Tree physiology

DOI

EISSN

1758-4469

ISSN

0829-318X

Publication Date

May 1998

Volume

18

Issue

5

Start / End Page

307 / 315

Related Subject Headings

  • Plant Biology & Botany
  • 4101 Climate change impacts and adaptation
  • 3108 Plant biology
  • 3103 Ecology
  • 0705 Forestry Sciences
  • 0607 Plant Biology
  • 0602 Ecology
 

Citation

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Pataki, D. E., Oren, R., Katul, G., & Sigmon, J. (1998). Canopy conductance of Pinus taeda, Liquidambar styraciflua and Quercus phellos under varying atmospheric and soil water conditions. Tree Physiology, 18(5), 307–315. https://doi.org/10.1093/treephys/18.5.307
Pataki, D. E., R. Oren, G. Katul, and J. Sigmon. “Canopy conductance of Pinus taeda, Liquidambar styraciflua and Quercus phellos under varying atmospheric and soil water conditions.Tree Physiology 18, no. 5 (May 1998): 307–15. https://doi.org/10.1093/treephys/18.5.307.
Pataki, D. E., et al. “Canopy conductance of Pinus taeda, Liquidambar styraciflua and Quercus phellos under varying atmospheric and soil water conditions.Tree Physiology, vol. 18, no. 5, May 1998, pp. 307–15. Epmc, doi:10.1093/treephys/18.5.307.
Journal cover image

Published In

Tree physiology

DOI

EISSN

1758-4469

ISSN

0829-318X

Publication Date

May 1998

Volume

18

Issue

5

Start / End Page

307 / 315

Related Subject Headings

  • Plant Biology & Botany
  • 4101 Climate change impacts and adaptation
  • 3108 Plant biology
  • 3103 Ecology
  • 0705 Forestry Sciences
  • 0607 Plant Biology
  • 0602 Ecology