摘要
本研究利用称重式仪器——水力蒸发器,观测了不同天气状况、不同生育时期及浇水前、后一天内各时段春小麦的蒸散量。研究结果说明:春小麦夜间(20—08时)蒸散量较小或为负值;蒸散量从08时开始增加,到16时左右达最大值;16时或18时以后蒸散量开始减小,夜间02—06时达全天最低值。晴天春小麦的蒸散量高于阴天,以10至18时差距最大。春小麦灌水及降雨后蒸散量有所增加。日不同时段的蒸散量与气温及水力蒸发器地面温度呈二次曲线关系。
Using the weighing instrument—hydraulic evapotranspirometer, we
have researched evapotranspiration of spring wheat in different weather conditions, different growing stages, and during the day before and after irrigating. The results show that the evapotranspiration of spring wheat is low or may be negative at night(20-08), but it increases from 08 o'clock in the morning and reaches the peak value about 16 o'clock, then decreases from 16 or 18 o'clock until minimum value about 02 to 04 o'clock at night. The evapotranspiration during clear day is higher than that during cloudy day, and the largest difference appears from 10 to 18 o'clock. After irrigating or raining the evapotranspiration of spring wheat increases to some extent. The relationships among evapotranspiration with air temperature and surface temperature are quadratic function curves at different times during a day.
出处
《高原气象》
CSCD
北大核心
1993年第2期201-208,共8页
Plateau Meteorology
