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Mean canopy stomatal conductance responses to water and nutrient availabilities in Picea abies and Pinus taeda.

Publication ,  Journal Article
Ewers, BE; Oren, R; Phillips, N; Strömgren, M; Linder, S
Published in: Tree Physiology
August 2001

We compared sap-flux-scaled, mean, canopy stomatal conductance (GS) between Picea abies (L.) Karst. in Sweden and Pinus taeda (L.) in North Carolina, both growing on nutritionally poor soils. Stomatal conductance of Picea abies was approximately half that of Pinus taeda and the sensitivity of GS in Picea abies to vapor pressure deficit (D) was lower than in Pinus taeda. Optimal fertilization increased leaf area index (L) two- and threefold in Pinus taeda and Picea abies, respectively, regardless of whether irrigation was increased. Although it increased L, fertilization did not increase GS in Picea abies unless irrigation was also provided. In Pinus taeda growing on coarse, sandy soils, the doubling of L in response to fertilization reduced GS sharply unless irrigation was also provided. The reduction in GS with fertilization in the absence of irrigation resulted from the production of fine roots with low saturated hydraulic conductivity. When Pinus taeda received both fertilization and irrigation, the increase in L was accompanied by a large increase in GS. In Pinus taeda, a reference GS (defined as GS at D = 1 kPa; GSR) decreased in all treatments with decreasing volumetric soil water content (theta). In Picea abies, theta varied little within a treatment, but overall, GSR declined with theta, reaching lowest values when drought was imposed by the interception of precipitation. Despite the large difference in GS both between Picea abies and Pinus taeda and among treatments, stem growth was related to absorbed radiation, and stem growth response to treatment reflected mostly the changes in L.

Duke Scholars

Published In

Tree Physiology

DOI

EISSN

1758-4469

ISSN

0829-318X

Publication Date

August 2001

Volume

21

Issue

12-13

Start / End Page

841 / 850

Related Subject Headings

  • Water
  • Sweden
  • Plant Transpiration
  • Plant Biology & Botany
  • Pinus taeda
  • Pinus
  • Picea
  • North Carolina
  • Environment
  • Biomass
 

Citation

APA
Chicago
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MLA
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Ewers, B. E., Oren, R., Phillips, N., Strömgren, M., & Linder, S. (2001). Mean canopy stomatal conductance responses to water and nutrient availabilities in Picea abies and Pinus taeda. Tree Physiology, 21(12–13), 841–850. https://doi.org/10.1093/treephys/21.12-13.841
Ewers, B. E., R. Oren, N. Phillips, M. Strömgren, and S. Linder. “Mean canopy stomatal conductance responses to water and nutrient availabilities in Picea abies and Pinus taeda.Tree Physiology 21, no. 12–13 (August 2001): 841–50. https://doi.org/10.1093/treephys/21.12-13.841.
Ewers BE, Oren R, Phillips N, Strömgren M, Linder S. Mean canopy stomatal conductance responses to water and nutrient availabilities in Picea abies and Pinus taeda. Tree Physiology. 2001 Aug;21(12–13):841–50.
Ewers, B. E., et al. “Mean canopy stomatal conductance responses to water and nutrient availabilities in Picea abies and Pinus taeda.Tree Physiology, vol. 21, no. 12–13, Aug. 2001, pp. 841–50. Epmc, doi:10.1093/treephys/21.12-13.841.
Ewers BE, Oren R, Phillips N, Strömgren M, Linder S. Mean canopy stomatal conductance responses to water and nutrient availabilities in Picea abies and Pinus taeda. Tree Physiology. 2001 Aug;21(12–13):841–850.
Journal cover image

Published In

Tree Physiology

DOI

EISSN

1758-4469

ISSN

0829-318X

Publication Date

August 2001

Volume

21

Issue

12-13

Start / End Page

841 / 850

Related Subject Headings

  • Water
  • Sweden
  • Plant Transpiration
  • Plant Biology & Botany
  • Pinus taeda
  • Pinus
  • Picea
  • North Carolina
  • Environment
  • Biomass