Nonresponse of native cottonwood trees to water additions during summer drought

Greg Cox, Dylan Fischer, Stephen C. Hart, Thomas G Whitham

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Studies have demonstrated that some riparian trees may switch their reliance on surface soil water (unsaturated or vadose zone) to groundwater (saturated zone) sources during the growing season in association with changes in moisture availability. A closely related question is: How do these trees respond to pulse increases in water availability in previously dry zones? We tested the whole-tree physiological response of 6 natural Populus genotypes to water additions during the peak of summer drought in northern Utah, USA. We found clear evidence that trees were insensitive to water additions to the surface soil that were twice the magnitude of whole-tree transpiration rates. Our results suggest that some cottonwoods may have little immediate transpiration or leaf conductance response to pulse soil moisture increases. This lack of response may be related to a water-use strategy associated with regional climate patterns (i.e., genetic or environmental programming), cavitation recovery, or other physical determinants of water use such as depth to groundwater. Our data suggest that it is important to consider potential nonresponsiveness to changes in soil water availability when evaluating the impact of climate change on these important and productive ecosystems.

Original languageEnglish (US)
Pages (from-to)175-185
Number of pages11
JournalWestern North American Naturalist
Volume65
Issue number2
StatePublished - Apr 2005

Fingerprint

drought
summer
vadose zone
water availability
water
transpiration
water use
groundwater
soil water
leaf conductance
phreatic zone
plant available water
cavitation
Populus
physiological response
regional climate
arid zones
soil surface
genotype
growing season

Keywords

  • Conductance
  • Cottonwood
  • Drought
  • Populus
  • Sap flow
  • Water addition
  • Water potential

ASJC Scopus subject areas

  • Ecology

Cite this

Nonresponse of native cottonwood trees to water additions during summer drought. / Cox, Greg; Fischer, Dylan; Hart, Stephen C.; Whitham, Thomas G.

In: Western North American Naturalist, Vol. 65, No. 2, 04.2005, p. 175-185.

Research output: Contribution to journalArticle

Cox, Greg ; Fischer, Dylan ; Hart, Stephen C. ; Whitham, Thomas G. / Nonresponse of native cottonwood trees to water additions during summer drought. In: Western North American Naturalist. 2005 ; Vol. 65, No. 2. pp. 175-185.
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