中文摘要：

棵间蒸发是农田作物蒸散的主要组成部分,且属于无效耗水,减少棵间蒸发量对提高农田水分利用率和节约用水具有重要意义。该文利用微型蒸发器测定夏玉米的棵间蒸发量,并根据2a的田间实测数据对双作物系数模型SIMDual_Kc进行参数率定和模型验证,将模型计算的棵间蒸发量与实测数据进行对比,计算各生育期棵间蒸发量占作物蒸散发的比例。结果表明,模型可以应用于该地区夏玉米生育期内土壤含水率和作物耗水量的模拟计算,其模拟的棵间蒸发量与实测值之间相关性较高,误差较小,可用于实测数据缺失时数据的插补。降雨对夏玉米生育初期棵间蒸发量影响较大,整个生育期内夏玉米棵间蒸发占总腾发量的比例在37%～45%左右。

英文摘要：

As a main component of the crop evapotranspiration, soil evaporation is usually useless water consumption at agriculture water use. So, it is necessary to reduce the soil evaporation as far as possible to improve the agriculture water use efficiency. In this paper, the observed field data of summer maize for two consecutive years were used to calibrate and validate the dual crop coefficients model— SIMDual_Kc model, and the observed soil evaporations measured by micro-lysimeter were also compared with simulated results of the SIMDual_Kc model. The ratio of the soil evaporation on the crop evapotranspiration was calculated and analyzed. Results show that the SIMDual_Kc model can be well applied to this region for simulating and calculating the soil water content and crop evapotranspiration of the summer maize, which has higher correlation and lower error between the simulated and observed ones. Thus the simulated values can be used for interpolation of the missing observed data and verification of the precision. It also revealed that precipitation during the initial period had a great influence on the soil evaporation, and the ratio of the soil evaporation of summer maize on actual crop evapotranspiration ranging from 37% to 45%.