华北地区冬小麦田辐射过程与热量过程的基本特征

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

摘要: 观测了冬小麦全生育期田间小气候，分析了冬小麦田辐射过程和热量过程的特征。结果表明，1d中反射率中午低而早晚高，呈“U”字形，反射率中午最低值为0.12～0.17左右。晴天辐射平衡占太阳总辐射的60%～70%。充分灌溉的麦田中午潜热通量占辐射平衡的60%～75%。

Abstract: 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.