基于涡度相关通量数据估算水稻光能利用率

摘要

The light use efficiency was used to estimate eddy covariance flux data of irrigated rice from jointing to mature period in Shouxian,Anhui Province,and the daily and seasonal variation of light use efficiency were also analyzed.The results suggest that the daily variation of light use efficiency first decreases then increases as a single peak U curve,which is higher at dawn and in the evening,lower at noon.Light use efficiency decreases with seasonal change.In daily variation,light use efficiency is positively correlated with temperature,but negatively correlated with absorbed photosynthetic active radiation.In seasonal variation,light use efficiency is positively correlated with temperature.%使用涡度相关通量数据估算安徽寿县农田水稻拔节至成熟期的光能利用率,并分析光能利用率的日变化和季节变化.研究表明:光能利用率的日动态呈现先降低后升高的单峰U型曲线,即早晚值较高,中午较低;季节变化总体呈现降低趋势.日变化中,光能利用率与温度呈正相关,与吸收的光合有效辐射呈显著负相关;季节变化中,光能利用率与温度呈弱正相关.