Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

Evaporation from a Themeda Grassland. II. Resistance Model of Plant Evaporation

F. X. Dunin, A. R. Aston and W. Reyenga
Journal of Applied Ecology
Vol. 15, No. 3 (Dec., 1978), pp. 847-858
DOI: 10.2307/2402780
Stable URL: http://www.jstor.org/stable/2402780
Page Count: 12
  • Read Online (Free)
  • Download ($18.00)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Evaporation from a Themeda Grassland. II. Resistance Model of Plant Evaporation
Preview not available

Abstract

(1) A model, incorporating resistances to water vapour transport, was developed to account for controls on grassland evaporation in the Southern Tablelands region of New South Wales, Australia. A relationship describing aerodynamic resistance was derived from short-term data on wind profiles. A second relationship, involving surface resistance as a function of solar radiation and soil moisture content, was obtained using short-term measurements from a lysimeter and of associated meteorological variables. (2) Model simulations corresponded well with evaporation from a lysimeter over a 5-year period. (3) Sensitivity analyses of parameters in the model indicated that aerodynamic resistance was not critical. Seasonal adjustments in the rainfall intercepted by the canopy improved estimates of weekly evaporation. (4) The role of the resistance model in land management is discussed. An example is given of the way in which the model may be used to predict changes in runoff resulting from the conversion of Themeda grassland to improved pasture.

Page Thumbnails

  • Thumbnail: Page 
847
    847
  • Thumbnail: Page 
848
    848
  • Thumbnail: Page 
849
    849
  • Thumbnail: Page 
850
    850
  • Thumbnail: Page 
851
    851
  • Thumbnail: Page 
852
    852
  • Thumbnail: Page 
853
    853
  • Thumbnail: Page 
854
    854
  • Thumbnail: Page 
855
    855
  • Thumbnail: Page 
856
    856
  • Thumbnail: Page 
857
    857
  • Thumbnail: Page 
858
    858