Boxelder water sources and physiology at perennial and ephemeral stream sites in Arizona

Thomas E Kolb, Stephen C. Hart, Ronald Amundson

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

To assess the influence of stream water on leaf gas exchange and water potential in different sized boxelder trees (Acer negundo L.), we compared these characteristics in trees growing beside a perennial stream and a nearby ephemeral stream in a montane-riparian forest in northern Arizona. Patterns of tree water use were quantified by stable isotope analysis (δ18O). Physiological characteristics were similar for large and small trees. Similarity between sites in predawn and daytime water potentials and xylem δ18O indicated that stream water was not a physiologically important water source. Seasonal and site variations in light-saturated net photosynthetic rate were significantly related to leaf-to-air vapor pressure deficit (r = -0.691) and foliar nitrogen concentration (r = 0.388). Although deep water was the dominant water source, surface soil water was utilized following precipitation, especially by small trees. We conclude that net carbon gain and severity of water stress are only weakly coupled to stream water availability.

Original languageEnglish (US)
Pages (from-to)151-160
Number of pages10
JournalTree Physiology
Volume17
Issue number3
StatePublished - Mar 1997

Fingerprint

Acer negundo
ephemeral streams
ephemeral stream
physiology
Water
water
water potential
riparian forest
montane forest
xylem
gas exchange
water stress
vapor pressure
riparian forests
water availability
atmospheric pressure
water use
montane forests
Acer
stable isotope

Keywords

  • Acer negundo
  • nitrogen
  • photosynthesis
  • riparian forests
  • stable isotopes
  • stomatal conductance
  • water relations

ASJC Scopus subject areas

  • Forestry
  • Plant Science

Cite this

Boxelder water sources and physiology at perennial and ephemeral stream sites in Arizona. / Kolb, Thomas E; Hart, Stephen C.; Amundson, Ronald.

In: Tree Physiology, Vol. 17, No. 3, 03.1997, p. 151-160.

Research output: Contribution to journalArticle

Kolb, Thomas E ; Hart, Stephen C. ; Amundson, Ronald. / Boxelder water sources and physiology at perennial and ephemeral stream sites in Arizona. In: Tree Physiology. 1997 ; Vol. 17, No. 3. pp. 151-160.
@article{8f5c391434fc4f4f8758200dfa98f9c6,
title = "Boxelder water sources and physiology at perennial and ephemeral stream sites in Arizona",
abstract = "To assess the influence of stream water on leaf gas exchange and water potential in different sized boxelder trees (Acer negundo L.), we compared these characteristics in trees growing beside a perennial stream and a nearby ephemeral stream in a montane-riparian forest in northern Arizona. Patterns of tree water use were quantified by stable isotope analysis (δ18O). Physiological characteristics were similar for large and small trees. Similarity between sites in predawn and daytime water potentials and xylem δ18O indicated that stream water was not a physiologically important water source. Seasonal and site variations in light-saturated net photosynthetic rate were significantly related to leaf-to-air vapor pressure deficit (r = -0.691) and foliar nitrogen concentration (r = 0.388). Although deep water was the dominant water source, surface soil water was utilized following precipitation, especially by small trees. We conclude that net carbon gain and severity of water stress are only weakly coupled to stream water availability.",
keywords = "Acer negundo, nitrogen, photosynthesis, riparian forests, stable isotopes, stomatal conductance, water relations",
author = "Kolb, {Thomas E} and Hart, {Stephen C.} and Ronald Amundson",
year = "1997",
month = "3",
language = "English (US)",
volume = "17",
pages = "151--160",
journal = "Tree Physiology",
issn = "0829-318X",
publisher = "Oxford University Press",
number = "3",

}

TY - JOUR

T1 - Boxelder water sources and physiology at perennial and ephemeral stream sites in Arizona

AU - Kolb, Thomas E

AU - Hart, Stephen C.

AU - Amundson, Ronald

PY - 1997/3

Y1 - 1997/3

N2 - To assess the influence of stream water on leaf gas exchange and water potential in different sized boxelder trees (Acer negundo L.), we compared these characteristics in trees growing beside a perennial stream and a nearby ephemeral stream in a montane-riparian forest in northern Arizona. Patterns of tree water use were quantified by stable isotope analysis (δ18O). Physiological characteristics were similar for large and small trees. Similarity between sites in predawn and daytime water potentials and xylem δ18O indicated that stream water was not a physiologically important water source. Seasonal and site variations in light-saturated net photosynthetic rate were significantly related to leaf-to-air vapor pressure deficit (r = -0.691) and foliar nitrogen concentration (r = 0.388). Although deep water was the dominant water source, surface soil water was utilized following precipitation, especially by small trees. We conclude that net carbon gain and severity of water stress are only weakly coupled to stream water availability.

AB - To assess the influence of stream water on leaf gas exchange and water potential in different sized boxelder trees (Acer negundo L.), we compared these characteristics in trees growing beside a perennial stream and a nearby ephemeral stream in a montane-riparian forest in northern Arizona. Patterns of tree water use were quantified by stable isotope analysis (δ18O). Physiological characteristics were similar for large and small trees. Similarity between sites in predawn and daytime water potentials and xylem δ18O indicated that stream water was not a physiologically important water source. Seasonal and site variations in light-saturated net photosynthetic rate were significantly related to leaf-to-air vapor pressure deficit (r = -0.691) and foliar nitrogen concentration (r = 0.388). Although deep water was the dominant water source, surface soil water was utilized following precipitation, especially by small trees. We conclude that net carbon gain and severity of water stress are only weakly coupled to stream water availability.

KW - Acer negundo

KW - nitrogen

KW - photosynthesis

KW - riparian forests

KW - stable isotopes

KW - stomatal conductance

KW - water relations

UR - http://www.scopus.com/inward/record.url?scp=0031000843&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031000843&partnerID=8YFLogxK

M3 - Article

VL - 17

SP - 151

EP - 160

JO - Tree Physiology

JF - Tree Physiology

SN - 0829-318X

IS - 3

ER -