内蒙古奈曼麦田生长期的微气象变化

采用波文比热量平衡法分析了内蒙古奈曼麦田生长不同阶段的微气象变化。结果表明：（１）麦田反射率随小麦生长趋于旺盛而减小；（２）随着小麦的生长，净辐射及其与太阳总辐射的比值增大；（３）白天净辐射主要用于潜热交换；夜里净辐射主要由潜热交换与土壤热交换补给；（４）波文比白天小，早晨和夜里大。

SEASONAL CHANGES OF MICROMETEOROLOGY OVER WHEAT FIELD AT NAIMAN,INNER MONGOLIA

Micrometeorologieal changes over wheat field at various growing stages in Naiman,InnerMongolia 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 Rrowth of wheat. (3)Most of the net radiation is spent for latent heat flux in daytime,and is mainly supported bylatent heat and soil heat exchangcs 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 wellas at night