Effects of sprinkler irrigation on canopy water-vapor exchange

Based on the experimental data of winter wheat, an experiment was carried out to investigate the effects of sprinkler irrigation on canopy water-vapor exchange in 2002 and 2003. The results showed that the influence of sprinkler irrigation on evaporation capacity at the top of canopy was not evident. Evaporation capacity at the top of canopy of sprinkler irrigation was a little less than that of surface irrigation. The influence of sprinkler irrigation on evaporation capacity in canopy was remarkable. Evaporation capacity in canopy of sprinkler irrigation field was much less than that of the same height in canopy of surface irrigation field. But evaporation capacity of 100 cm height in sprinkler irrigation field was a little larger than that of the same height in surface irrigation field. Topsoil evaporation of surface irrigation field is higher than that of sprinkler irrigation field. The influence of sprinkler irrigation on evapotranspiration was not evident. The amount of evapotranspiration of surface irrigation field was a little larger than that of sprinkler irrigation field. The coagulating water amount of sprinkler irrigation field was more than that of surface irrigation field at night.