不同水分条件麦田能量与CO_2通量变化特征研究

Study on energy and CO 2 fluxes over winter wheat fields with differ ent water treatments

试验观测不同水分处理冬小麦田能量平衡各分量、反射率和CO2 通量日变化及日际变化特征结果表明 ,小麦拔节期麦田地表反射率平均值约为 0 .18,不同水分处理农田潜热通量和显热通量均有明显差异 ,晴朗天气冬小麦冠层顶部CO2 通量日变化呈抛物线形 ,麦田主要表现为CO2 的汇。

Based on the observations on energy balance in winter wh eat fields with different water treatments in Shunyi County,Beijing,the daily an d diurnal variations of energy partitioning, albedo and CO 2 fluxes over the di fferent water treating fields are compared and analyzed. The results show that t he daily mean albedo is about 0.18during the jointing period, the latent and sen sible heat fluxes show significant difference under different water treatments. The daily variation of CO 2 flux above canopy is a parabola shape and the canop y is a sink of CO 2 in this period.