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Trees

, Volume 17, Issue 4, pp 351–358 | Cite as

Drought stress and recovery of riparian cottonwoods due to water table alteration along Willow Creek, Alberta

  • Nadine M. Amlin
  • Stewart B. RoodEmail author
Original Article
  • 316 Downloads

Abstract

A 5-m-deep gravel pit was excavated from 1996 to 1998 in the floodplain between Willow Creek, Alberta, and a grove of balsam poplars ('cottonwoods', Populus balsamifera L.) and water level at the pit was lowered 2.5 m through pumping. This interrupted the infiltration of stream water into the riparian groundwater and imposed drought stress on the cottonwoods. Trees in the drought-affected grove displayed extensive leaf senescence and abscission in late August 1998, while trees in nearby control groves remained green until autumnal senescence in late September. The precocious senescence was accompanied by a two-thirds reduction in leaf stomatal conductance (g s) but mid-day leaf xylem water potentials (ψl) were only slightly reduced (−1.55 vs 1.42 MPa). Pumping ceased in 1999, the pit was partially refilled, and the hydraulic linkage between the stream and the riparian zone recovered. Subsequently in August 1999, g s and ψl were similar for trees in the affected and control groves and senescence phenologies were similar in 1999 and 2000. Annual branch growth increments varied 3-fold across years between 1994 and 1999, but there was no reduction in these growth increments in the drought-affected trees in 1998 or 1999. This study supports the hydraulic linkage between a stream and the adjacent riparian zone in a semi-arid region and demonstrates the vulnerability of riparian cottonwoods to drought due to water table depletion. It also indicates rapid physiological recovery of cottonwoods following restoration of water availability.

Keywords

Cottonwoods Drought Populus balsamifera Stress Water relations 

Notes

Acknowledgements

This research was funded by a Natural Sciences and Engineering Research Council (NSERC) of Canada scholarship to N.M.A., NSERC research grants to S.B.R. and a research contract from Alberta Environment. This study comprised a part of N.M.A.'s University of Lethbridge M.Sc. Thesis and the inputs from committee members J. Mahoney (Alberta Environment, Lethbridge), C. Goater and R. Rogerson (University of Lethbridge) and external examiner M. Scott (USGS, Fort Collins) are gratefully acknowledged. Thanks are also extended to Alberta Infrastructure, Ron May and the Brown Family for permitting research on their lands, Damian Gilbert and Cathy Metzler for assistance with field work and Lori Gom for assistance with manuscript preparation.

References

  1. Albertson FW, Weaver JE (1945) Injury and death or recovery of trees in prairie climate. Ecol Monogr 15:395–433Google Scholar
  2. Amlin NM, Rood SB (2002) Comparative tolerances of riparian willows and cottonwoods to water table decline. Wetlands 22:338–346Google Scholar
  3. Blake TJ, Tschaplinski TJ, Eastman A (1984) Stomatal control of water use efficiency in poplar clones and hybrids. Can J Bot 62:1344–1351Google Scholar
  4. Blake TJ, Sperry JS, Tschaplinsky TJ, Wang SS (1996) Water relations. In: Stettler RF, Bradshaw HD Jr, Heilman PE, Hinckley TM (eds) Biology of Populus and its implication for management and conservation. NRC Research, National Research Council of Canada, Ottawa, pp 401–422Google Scholar
  5. Braatne JH, Hinckley TM, Stettler RF (1992) Influence of soil water on the physiological and morphological components of plant water balance in Populus trichocarpa and Populus deltoides and their F1 hybrids. Tree Physiol 11:325–339Google Scholar
  6. Busch DE, Smith SD (1995) Mechanisms associated with decline of woody species in riparian ecosystems of the southwestern U.S. Ecol Monogr 65:347–370Google Scholar
  7. Busch DE, Ingraham NL, Smith SD (1992) Water uptake in woody riparian phreatophytes of the southwestern United States: a stable isotope study. Ecol Appl 2:450–459Google Scholar
  8. Gom LA, Rood SB (1999) Patterns of clonal occurrence in a mature cottonwood grove along the Oldman River, Alberta. Can J Bot 77:1095–1105CrossRefGoogle Scholar
  9. Gordon ND, McMahon TA, Finlayson BL (1992) Stream hydrology: an introduction for ecologists. Wiley, TorontoGoogle Scholar
  10. Hogg EH, Hurdle PA (1997) Sap flow in trembling aspen: implications for stomatal responses to vapor pressure deficit. Tree Physiol 17: 501–509Google Scholar
  11. Horton JL, Kolb TE, Hart SC (2001a) Physiological response to groundwater depth varies among species and with river flow regulation. Ecol Appl 11:1046–1059Google Scholar
  12. Horton JL, Kolb TE, Hart SC (2001b) Responses of riparian trees to interannual variation in ground water depth in a semi-arid river basin. Plant Cell Environ 24:293–304CrossRefGoogle Scholar
  13. Kelliher FM, Kirkham MB, Tauer CG (1980) Stomatal resistance, transpiration, and growth of drought-stressed eastern cottonwood. Can J For Res 10:447–451Google Scholar
  14. Kranjcec J, Mahoney JM, Rood SB (1998) The responses of three riparian cottonwood species to water table decline. For Ecol Manage 110:77–87CrossRefGoogle Scholar
  15. Mahoney JM, Rood SB (1991) A device for studying the influence of declining water table on poplar growth and survival. Tree Physiol 8:305–314Google Scholar
  16. Mahoney JM, Rood SB (1992) Response of a hybrid poplar to water table decline in different substrates. For Ecol Manage 54:141–156Google Scholar
  17. McDermitt DK (1990) Sources of error in estimation of stomatal conductance and transpiration from porometer data. HortScience 25:1538–1548Google Scholar
  18. Naiman RJ, Décamps H (1997) The ecology of interfaces: riparian zones. Annu Rev Ecol Syst 28:621–658CrossRefGoogle Scholar
  19. Rood SB, Mahoney JM (1990) Collapse of riparian poplar forests downstream from dams in western prairies: probable causes and prospects for mitigation. Environ Manage 14:451–464Google Scholar
  20. Rood SB, Mahoney JM, Reid DE, Zilm L (1995) Instream flows and the decline of riparian cottonwoods along the St. Mary River, Alberta. Can J Bot 73:1250–1260Google Scholar
  21. Rood SB, Patino S, Coombs K, Tyree MT (2000a) Branch sacrifice: cavitation-associated drought adaptation of riparian cottonwoods. Trees 14:248–257CrossRefGoogle Scholar
  22. Rood SB, Zanewich K, Stefura C, Mahoney JM (2000b) Influence of water table decline on growth allocation and endogenous gibberellins in black cottonwood. Tree Physiol 20:831–836Google Scholar
  23. Schulte PJ, Hinckley TM, Stettler RF (1987) Stomatal responses of Populus to leaf water potential. Can J Bot 65:255–260Google Scholar
  24. Scott ML, Shafroth PB, Auble GT (1999) Responses of riparian cottonwoods to alluvial water table declines. Environ Manage 23:347–358CrossRefPubMedGoogle Scholar
  25. Scott ML, Lines GC, Auble GT (2000) Channel incision and patterns of cottonwood stress and mortality along the Mojave River, California. J Arid Environ 44:399–414CrossRefGoogle Scholar
  26. Shafroth PB, Stromberg JC, Patten DT (2000) Woody riparian vegetation response to different alluvial water table regimes. West N Am Nat 60: 66–76Google Scholar
  27. Smith SD, Wellington BA, Nachlinger JL, Fox CA (1991) Functional responses of riparian vegetation to streamflow diversion in the eastern Sierra Nevada. Ecol Appl 1: 89–97Google Scholar
  28. Sparks JP, Black A (1999) Regulation of water loss in populations of Populus trichocarpa: the role of stomatal control in preventing xylem cavitation. Tree Physiol 19: 453–459Google Scholar
  29. Stromberg JC, Patten DT (1996) Instream flow and cottonwood growth in the eastern Sierra Nevada of California, USA. Reg Rivers Res Manage 12:1–12CrossRefGoogle Scholar
  30. Tschaplinski TJ, Tuskan GA, Gebre GM, Todd DE (1998) Drought resistance of two hybrid Populus clones grown in a large-scale plantation. Tree Physiol 18: 653–658Google Scholar
  31. Tyree MT, Sperry JS (1988) Do plants operate near the point of catastrophic xylem dysfunction caused by dynamic water stress? Plant Physiol 88: 574–580Google Scholar
  32. Tyree MT, Kolb KJ, Rood SB, Patino S (1994) Vulnerability to drought-induced cavitation of riparian cottonwoods in Alberta: a possible factor in the decline of the ecosystem? Tree Physiol 14:455–466Google Scholar
  33. Weaver LA, Flanagan LB, Carlson PJ (2002) Seasonal and interannual variation in evapotranspiration, energy balance and surface conductance in a northern temperate grassland. Agric For Meteorol 112: 31–49CrossRefGoogle Scholar
  34. Willms J, Rood SB, Willms W, Tyree MT (1998) Branch growth of riparian cottonwoods: a hydrologically sensitive dendrochronological tool. Trees 12:15–223CrossRefGoogle Scholar
  35. Zhang H, Morison JIL, Simmonds LP (1999) Transpiration and water relations of poplar trees growing close to the water table. Tree Physiol 19:563–573Google Scholar

Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.Department of Biological SciencesUniversity of LethbridgeAlbertaCanada

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