Responses of riparian trees to interannual variation in ground water depth in a semi-arid river basin

J. L. Horton, Thomas E Kolb, S. C. Hart

Research output: Contribution to journalArticle

130 Citations (Scopus)

Abstract

We investigated the physiological and growth responses of native (Populus fremontii S. Wats. and Salix gooddingii Ball) and exotic (Tamarix chinensis Lour.) riparian trees to ground water availability at the free-flowing Hassayampa River, Arizona, during dry (1997) and wet (1998) years. In the drier year, all species experienced considerable water stress, as evidenced by low shoot water potentials, low leaf gas exchange rates and large amounts of canopy dieback. These parameters were significantly related to depth of ground water (DGW) in the native species, but not in T. chinensis, in 1997. Canopy dieback was greater in the native species than in T. chinensis when ground water was deep in 1997, and dieback increased rapidly at DGW > 2.5-3.0 m for the native species. Analysis of combined data from wet and dry years for T. chinensis tentatively suggests a similar physiological sensitivity to water availability and a similar DGW threshold for canopy dieback. In 1998, shoot water potential and leaf gas exchange rates were higher and canopy dieback was lower for all species because of increased water availability. However, T. chinensis showed a much larger increase in leaf gas exchange rates in the wet year than the native species. High leaf gas exchange rates, growth when water is abundant, drought tolerance and the maintenance of a viable canopy under dry conditions are characteristics that help explain the ability of T. chinensis to thrive in riparian ecosystems in the south-western United States.

Original languageEnglish (US)
Pages (from-to)293-304
Number of pages12
JournalPlant, Cell and Environment
Volume24
Issue number3
DOIs
StatePublished - 2001

Fingerprint

Tamarix chinensis
Groundwater
Rivers
dieback
groundwater
Gases
gas exchange
canopy
Water
indigenous species
Tamaricaceae
water potential
leaves
Salix
Populus
Populus fremontii
Droughts
Growth
Southwestern United States
shoots

Keywords

  • El Niño southern oscillation
  • Leaf gas exchange
  • Populus fremontii
  • Salix gooddingii
  • Tamarix chinensis
  • Water stress

ASJC Scopus subject areas

  • Plant Science

Cite this

Responses of riparian trees to interannual variation in ground water depth in a semi-arid river basin. / Horton, J. L.; Kolb, Thomas E; Hart, S. C.

In: Plant, Cell and Environment, Vol. 24, No. 3, 2001, p. 293-304.

Research output: Contribution to journalArticle

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