冬小麦生长季蒸散与水分利用效率变化特征

Characteristics of Evapotranspiration and Water Use Efficiency of Typical Irrigated Winter Wheat in NCP

利用中国科学院栾城农业生态系统试验站的涡度相关仪器观测数据,分析了2008年华北平原冬小麦的蒸散以及群体水分利用效率(WUE)的变化特征。分析结果表明,土壤含水量变化对蒸散量影响显著,冬小麦各生育期平均日蒸散量最大值为6.6mm,出现在灌浆期,最小值出现在返青-起身期为0.3mm。群体水分利用效率整个生育期内在0.1～12.3g/kg之间变化,在灌浆初期达到最高值。蒸散量和群体水分利用效率的总体变化趋势一致,CO2通量的变化趋势与WUE相同。

Based on the data from Luancheng Agricultural Ecosystem Experimental Station of CAS,the variation characteristics of evapotranspiration （ET） and water use efficiency （WUE） for winter wheat were analyzed.The results indicated that soil water content affected ET remarkably.The maximum of daily ET in different growth stages was 6.6 mm which appeared in the milking stage.And the minimum was 0.3 mm in the reviving-rising stage.WUE changed between 0.1-12.3 g/kg in the whole growth period while the maximum turned out in the milking stage.The general trends of variation characters for ET and WUE were consistent.And variation of CO2 flux was also similar to WUE.