Characteristics of radiation and heat processes over wheat field in North China Plain

The microclimate over wheat field during total growth period was observed in 1998.The characteristics of radiation and heat processes over wheat field were analyzed.It is showed that the albedo of wheat canopy is low in midday and high in the morning and at night.The albedo range was from 0.12 to 0.17 in daytime.The radiation balance in clear days is 60%～70% of solar radiation.The latent heat flux is 60%～75% of radiation balance in daytime for well irrigated wheat field in North China Plain.