【摘要】 本文利用2年的大型称重式蒸渗仪和小型棵间蒸发器的测定资料,研究了不同灌水(2001年灌140mm、2002年灌65mm)条件下夏玉米生长期间的逐日蒸发蒸腾和棵间蒸发过程。结果表明,2年夏玉米生长期间棵间蒸发占总蒸发蒸腾量的比例分别为43 69%和48 12%。分析得出夏玉米出苗前利用小型棵间蒸发器实测蒸发的修正系数为0 96。同时,分析了棵间蒸发占蒸发蒸腾的比例随叶面积指数(LAI)和表层土壤含水量的变化关系。更多还原

【Abstract】 The daily changes of evapotranspiration and soil evaporation for summer maize field were analyzed according to the observation data using large weighing lysimeters and micro-lysimeters in the period of growing season in 2001 and 2003.The result shows that the ratio of soil evaporation to evapotranspiration is 43.95% and 48.82% respectively,which is correlated to the irrigation condition.Soil evaporation can be calculated by using the soil evaporation measured by micro-lysimeter by multiplying a coefficient of 0.96.The variation of the ratio of soil evaporation to evapotranspiration following the changes of leaf area index and surface soil moisture is also analyzed.更多还原