Free-air CO2 enrichment and soil nitrogen effects on energy balance and evapotranspiration of wheat
作者： B. A. Kimball , R. L. LaMorte , P. J. Pinter , G. W. Wall , D. J. Hunsaker
DOI: 10.1029/1998WR900115
关键词:
摘要: In order to determine the likely effects of increasing atmospheric CO2 concentration on future evapotranspiration, ET, plots field-grown wheat were exposed concentrations 550 µmol/mol (or 200 above current ambient levels about 360 µmol/mol) using a free-air enrichment (FACE) facility. Data collected for four growing seasons at ample water and fertilizer (high N) two when soil nitrogen was limited (low N). Measurements made net radiation, Rn; heat flux; air temperatures; canopy temperature, Ts; wind speed. Sensible flux calculated from temperature measurements. that is, latent flux, determined as residual in energy balance. The FACE treatment increased daytime Ts 0.6° 1.1°C high low N, respectively. Daily total Rn reduced by 1.3% both N. ET consistently lower plots, 6.7% 19.5%
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