关键词: 麦田, 微气象, 热量平衡, 波文比

Abstract: Micrometeorological changes over wheat field at various growing stages in Naiman,Inner Mongolia are analyzed utilizing the Bowen ratio heat budget method. The results show that:(1)Albedo of the wheat field decreases with wheat growth. It is 0.25 at the elongation stage,0.21 at the boot stage,and 0.13 at the start of the ripening stage,respectively. (2)Net radiation and its ratio to solar radiation increase with growth of wheat. (3)Most of the net radiation is spent for latent heat flux in daytime,and is mainly supported by latent heat and soil heat exchanges at night.(4)Bowen ratio is lower in daytime than at night and in the early morning. (5)The wind profiles above the surfacc of the wheat field is nearly logarithmic in daytime as well as at night.

Key words: Wheat field, Micrometeorology, Heat budget, Bowen ratio