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Ecosystems

, Volume 13, Issue 3, pp 421–436 | Cite as

Interannual Invariability of Forest Evapotranspiration and Its Consequence to Water Flow Downstream

  • A. Christopher OishiEmail author
  • Ram Oren
  • Kimberly A. Novick
  • Sari Palmroth
  • Gabriel G. Katul
Article

Abstract

Although drought in temperate deciduous forests decreases transpiration rates of many species, stand-level transpiration and total evapotranspiration is often reported to exhibit only minor interannual variability with precipitation. This apparent contradiction was investigated using four years of transpiration estimates from sap flux, interception–evaporation estimates from precipitation and throughfall gauges, modeled soil evaporation and drainage estimates, and eddy covariance data in a mature oak-hickory forest in North Carolina, USA. The study period included one severe drought year and one year of well above-average precipitation. Normalized for atmospheric conditions, transpiration rates of some species were lower in drought than in wet periods whereas others did not respond to drought. However, atmospheric conditions during drought periods are unlike conditions during typical growing season periods. The rainy days that are required to maintain drought-free periods are characterized by low atmospheric vapor pressure deficit, leading to very low transpiration. In contrast, days with low air vapor pressure deficit were practically absent during drought and moderate levels of transpiration were maintained throughout despite the drying soil. Thus, integrated over the growing season, canopy transpiration was not reduced by drought. In addition, high vapor pressure deficit during drought periods sustained appreciable soil evaporation rates. As a result, despite the large interannual variation in precipitation (ranging from 934 to 1346 mm), annual evapotranspiration varied little (610–668 mm), increasing only slightly with precipitation, due to increased canopy rainfall interception. Because forest evapotranspiration shows only modest changes with annual precipitation, lower precipitation translates to decreased replenishment of groundwater and outflow, and thus the supply of water to downstream ecosystems and water bodies.

Keywords

broadleaf deciduous drainage drought precipitation transpiration water yield 

Notes

Acknowledgements

This Research was supported by the Office of Science (BER) U.S. Department of Energy, Grant No. DE-FG02_00ER63015. We would like to thank P. Stoy, H. McCarthy, H.-S. Kim, B. Poulter, and K. Schäfer for assistance with data collection and analysis, and K. Johnsen and D. D. Richter for unpublished observations on fine roots.

Supplementary material

10021_2010_9328_MOESM1_ESM.doc (48 kb)
(DOC 47 kb)

References

  1. Addington RN, Donovan LA, Mitchell RJ, Vose JM, Pecot SD, Jack SB, Hacke UG, Sperry JS, Oren R. 2006. Adjustments in hydraulic architecture of Pinus palustris maintain similar stomatal conductance in xeric and mesic habitats. Plant Cell Environ 29:535–45.CrossRefPubMedGoogle Scholar
  2. Baldocchi DD, Meyers TP. 1991. Trace gas-exchange above the forest floor of a deciduous forest. 1. Evaporation and CO2 efflux. J Geophys Res Atmos 96:7271–85.CrossRefGoogle Scholar
  3. Bovard BD, Curtis PS, Vogel CS, Su H-B, Schmid HP. 2005. Environmental controls on sap flow in a northern hardwood forest. Tree Physiol 25:31–8.PubMedGoogle Scholar
  4. Bréda N, Huc R, Granier A, Dreyer E. 2006. Temperate forest trees and stands under severe drought: a review of ecophysiological responses, adaptation processes and long-term consequences. Ann Sci For 63:625–44.CrossRefGoogle Scholar
  5. Caldwell MM, Dawson TE, Richards JH. 1998. Hydraulic lift: consequences of water efflux from the roots of plants. Oecologia 113:151–61.CrossRefGoogle Scholar
  6. Clapp RB, Hornberger GM. 1978. Empirical equations for some soil hydraulic properties. Water Resour Res 14:601–4.CrossRefGoogle Scholar
  7. Daley MJ, Phillips NG. 2006. Interspecific variation in nighttime transpiration and stomatal conductance in a mixed New England deciduous forest. Tree Physiol 26:411–9.PubMedGoogle Scholar
  8. Dawson TE, Burgess SSO, Tu KP, Oliveira RS, Santiago LS, Fisher JB, Simonin KA, Ambrose AR. 2007. Nighttime transpiration in woody plants from contrasting ecosystems. Tree Physiol 27:561–75.PubMedGoogle Scholar
  9. Emerman SH, Dawson TE. 1996. Hydraulic lift and its influence on the water content of the rhizosphere: an example from sugar maple, Acer saccharum. Oecologia 108:273–8.Google Scholar
  10. Ewers BE, Mackay DS, Samanta S. 2007. Interannual consistency in canopy stomatal conductance control of leaf water potential across seven tree species. Tree Physiol 27:11–24.PubMedGoogle Scholar
  11. Granier A. 1987. Sap flow measurements in Douglas fir tree trunks by means of a new thermal method. Ann Sci For 44:1–14.CrossRefGoogle Scholar
  12. Hanson PJ, Amthor JS, Wullschleger SD, Wilson KB, Grant RF, Hartley A, Hui D, Hunt ER Jr, Johnson DW, Kimball JS, King AW, Luo Y, McNulty SG, Sun G, Thornton PE, Wang S, Williams M, Baldocchi DD, Cushman RM. 2004. Oak forest carbon and water simulations: model intercomparisons and evaluations against independent data. Ecol Monogr 74:443–89.CrossRefGoogle Scholar
  13. Hanson PJ, Huston MA, Todd DE. 2003. Walker branch throughfall displacement experiment. In: Hanson PJ, Wullschleger SD, Eds. North American Temperate Deciduous Forest Responses to Changing Precipitation Regimes. New York: Springer-Verlag. p 8–31.Google Scholar
  14. Hornbeck JW, Martin CW, Eagar C. 1997. Summary of water yield experiments at Hubbard Brook Experimental Forest, New Hampshire. Can J For Res 27:2043–52.CrossRefGoogle Scholar
  15. Juang JY, Katul GG, Porporato A, Stoy PC, Siqueira MS, Detto M, Kim HS, Oren R. 2007. Eco-hydrological controls on summertime convective rainfall triggers. Glob Change Biol 13:887–96.Google Scholar
  16. Katul G, Todd P, Pataki D, Kabala ZJ, Oren R. 1997. Soil water depletion by oak trees and the influence of root water uptake on the moisture content spatial statistics. Water Resour Res 33:611–23.CrossRefGoogle Scholar
  17. Kim H-S. 2009. Measurement and Modeling of Radiation and Water Fluxes in Plantation Forests. Nicholas School of the Environment and Earth Sciences. Durham, NC: Duke University.Google Scholar
  18. Kim H-S, Oren R, Hinckley TM. 2008. Actual and potential transpiration and carbon assimilation in an irrigated poplar plantation. Tree Physiol 28:559–77.PubMedGoogle Scholar
  19. Köecher P, Gebauer T, Horna V, Leuschner C. 2009. Leaf water status and stem xylem flux in relation to soil drought in five temperate broad-leaved tree species with contrasting water use strategies. Ann For Sci 66, Article No.: 101.Google Scholar
  20. Lu J, Sun G, McNulty SG, Amatya DM. 2005. A comparison of six potential evapotranspiration methods for regional use in the southeastern United States. J Am Water Resour Assoc 41:621–33.CrossRefGoogle Scholar
  21. Novick KA, Stoy PC, Katul GG, Ellsworth DS, Siqueira MBS, Juang J-Y, Oren R. 2004. Carbon dioxide and water vapor exchange in a warm temperate grassland. Oecologia 138:259–74.CrossRefPubMedGoogle Scholar
  22. Oishi AC, Oren R, Stoy PC. 2008. Estimating components of forest evapotranspiration: a footprint approach for scaling sap flux measurements. Agric For Meteorol 148:1719–32.CrossRefGoogle Scholar
  23. Oosting HJ. 1942. An ecological analysis of the plant communities of Pidemont, North Carolina. Am Midland Naturalist 28:1–126.CrossRefGoogle Scholar
  24. Oren R, Ewers BE, Todd P, Phillips N, Katul GG. 1998. Water balance delineates the soil layer in which moisture affects canopy conductance. Ecol Appl 8:990–1002.CrossRefGoogle Scholar
  25. Oren R, Pataki DE. 2001. Transpiration in response to variation in microclimate and soil moisture in southeastern deciduous forests. Oecologia 127:549–59.CrossRefGoogle Scholar
  26. Oren R, Sperry JS, Katul G, Pataki DE, Ewers BE, Phillips N, Schafer KVR. 1999. Survey and synthesis of intra- and interspecific variation in stomatal sensitivity to vapour pressure deficit. Plant Cell Environ 22:1515–26.CrossRefGoogle Scholar
  27. Oren R, Sperry JS, Ewers BE, Pataki DE, Phillips N, Megonigal JP. 2001. Sensitivity of mean canopy stomatal conductance to vapor pressure deficit in a flooded Taxodium distichum L. forest? hydraulic and non-hydraulic effects. Oecologia 126:21–9.CrossRefGoogle Scholar
  28. Pataki DE, Oren R. 2003. Species differences in stomatal control of water loss at the canopy scale in a mature bottomland deciduous forest. Adv Water Resour 26:1267–78.CrossRefGoogle Scholar
  29. Paul KI, Polglase PJ, O’Connell AM, Carlyle JC, Smethurst PJ, Khanna PK, Worledge D. 2003. Soil water under forests (SWUF): a model of water flow and soil water content under a range of forest types. For Ecol Manage 182:195–211.CrossRefGoogle Scholar
  30. Phillips N, Oren R. 2001. Intra- and inter-annual variation in transpiration of a pine forest. Ecol Appl 11:385–96.CrossRefGoogle Scholar
  31. Phillips N, Oren R, Zimmermann R. 1996. Radial patterns of xylem sap flow in non-, diffuse- and ring-porous tree species. Plant Cell Environ 19:983–90.CrossRefGoogle Scholar
  32. Roberts J. 1983. Forest transpiration—a conservative hydrological process. J Hydrol 66:133–41.CrossRefGoogle Scholar
  33. Schäfer KVR, Oren R, Lai C-T, Katul GG. 2002. Hydrologic balance in an intact temperate forest ecosystem under ambient and elevated atmospheric CO2 concentration. Glob Change Biol 8:895–911.CrossRefGoogle Scholar
  34. Sinclair TR, Holbrook NM, Zwieniecki MA. 2005. Daily transpiration rates of woody species on drying soil. Tree Physiol 25:1469–72.PubMedGoogle Scholar
  35. Siqueira M, Katul G, Porporato A. 2008. Onset of water stress, hysteresis in plant conductance, and hydraulic lift: scaling soil water dynamics from millimeters to meters. Water Resour Res 44.Google Scholar
  36. Stoy PC, Katul GG, Siqueira MBS, Juang J-Y, Novick KA, McCarthy HR, Oishi AC, Uebelherr JM, Kim H-S, Oren R. 2006. Separating the effects of climate and vegetation on evapotranspiration along a successional chronosequence in the southeastern US. Glob Change Biol 12:2115–35.CrossRefGoogle Scholar
  37. Ward EJ, Oren R, Sigurdsson BD, Jarvis PG, Linder S. 2008. Fertilization effects on mean stomatal conductance are mediated through changes in the hydraulic attributes of mature Norway spruce trees. Tree Physiol 28:579–96.PubMedGoogle Scholar
  38. Wear DN, Greis JG. 2002. The southern forest resource assessment summary report. In: Southern Forest Resource Assessment. Gen. Tech. Rep. SRS-53. Wear DN, Greis JG, Eds. US Department of Agriculture, Forest Service, Southern Research Station, Asheville, NC.Google Scholar
  39. Wilson KB, Hanson PJ, Baldocchi DD. 2000. Factors controlling evaporation and energy partitioning beneath a deciduous forest over an annual cycle. Agric For Meteorol 102:83–103.CrossRefGoogle Scholar
  40. Wilson KB, Hanson PJ, Mulholland PJ, Baldocchi DD, Wullschleger SD. 2001. A comparison of methods for determining forest evapotranspiration and its components: sap-flow, soil water budget, eddy covariance and catchment water balance. Agric For Meteorol 106:153–68.CrossRefGoogle Scholar
  41. Wullschleger SD, Hanson PJ. 2003. Sensitivity of sapling and mature-tree water use to altered precipitation regimes. In: Hanson PJ, Wullschleger SD, Eds. North American Temperate Deciduous Forest Responses to Changing Precipitation Regimes. New York: Springer-Verlag.Google Scholar
  42. Wullschleger SD, Hanson PJ. 2006. Sensitivity of canopy transpiration to altered precipitation in an upland oak forest: evidence from a long-term field manipulation study. Glob Change Biol 12:97–109.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • A. Christopher Oishi
    • 1
    Email author
  • Ram Oren
    • 1
    • 2
  • Kimberly A. Novick
    • 1
  • Sari Palmroth
    • 1
  • Gabriel G. Katul
    • 1
    • 2
  1. 1.Nicholas School of the Environment and Earth SciencesDuke UniversityDurhamUSA
  2. 2.Department of Civil and Environmental Engineering, Pratt School of EngineeringDuke UniversityDurhamUSA

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