A comparison of summertime water and CO 2 fluxes over rangeland for well watered and drought conditions

A comparison of summertime water and CO 2 fluxes over rangeland for well watered and drought... Continuous measurements of the surface energy balance components (net radiation R n , sensible heat flux H , latent heat flux LE, ground heat flux G , and CO 2 fluxes began in early June of 1995 at the Little Washita Watershed, near Chickasha, Oklahoma. A severe drought during 1998 provided a unique opportunity to evaluate the range of fluxes that can be expected during the summer period. Data obtained during four continuous summer periods were used to evaluate the year-to-year variability in summertime energy and CO 2 fluxes. During the summer period (day 150–240), total evapotranspiration for non-drought years ranged from 224 to 273 mm with a mean and standard error of 253±12 mm . The mean and standard error of the net ecosystem exchange (NEE) rate of carbon dioxide for the same summer period was −120±36 g C / m 2 . In a year with severe drought (1998) total evapotranspiration for the summertime period was 145 mm. The lack of precipitation during this time resulted in total losses to the atmosphere of 155 g C/m 2 from soil respiration. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Agricultural and Forest Meteorology Elsevier

A comparison of summertime water and CO 2 fluxes over rangeland for well watered and drought conditions

Agricultural and Forest Meteorology, Volume 106 (3) – Feb 3, 2001

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Publisher
Elsevier
Copyright
Copyright © 2001 Elsevier Science B.V.
ISSN
0168-1923
D.O.I.
10.1016/S0168-1923(00)00213-6
Publisher site
See Article on Publisher Site

Abstract

Continuous measurements of the surface energy balance components (net radiation R n , sensible heat flux H , latent heat flux LE, ground heat flux G , and CO 2 fluxes began in early June of 1995 at the Little Washita Watershed, near Chickasha, Oklahoma. A severe drought during 1998 provided a unique opportunity to evaluate the range of fluxes that can be expected during the summer period. Data obtained during four continuous summer periods were used to evaluate the year-to-year variability in summertime energy and CO 2 fluxes. During the summer period (day 150–240), total evapotranspiration for non-drought years ranged from 224 to 273 mm with a mean and standard error of 253±12 mm . The mean and standard error of the net ecosystem exchange (NEE) rate of carbon dioxide for the same summer period was −120±36 g C / m 2 . In a year with severe drought (1998) total evapotranspiration for the summertime period was 145 mm. The lack of precipitation during this time resulted in total losses to the atmosphere of 155 g C/m 2 from soil respiration.

Journal

Agricultural and Forest MeteorologyElsevier

Published: Feb 3, 2001

References

  • On using eco-physiological, micrometeorological and biogeochemical theory to evaluate carbon dioxide, water vapor, and trace gas fluxes over vegetation: a perspective
    Baldocchi, D.D; Meyers, T.P
  • Carbon dioxide fluxes over bermudagrass, native prairie, and sorghum
    Dugas, W.A; Heuer, M.L; Mayeaux, H.S
  • Eddy-correlation system for long-term monitoring of fluxes of heat, water vapour, and CO 2
    Grelle, A; Lindroth, A
  • Evaporation and canopy characteristics of coniferous forests and grasslands
    Kelliher, F.M; Leuning, R; Schulze, E.-D

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