单、双作物系数法计算夏玉米需水量对比研究

Comparison of Summer Corn Water Requirements Computed by Single Crop Coefficient Approach and Dual Crop Coefficient Approach

采用FAO-56推荐计算作物需水量的单作物系数和双作物系数方法,计算豫北安阳地区夏玉米需水量,并与实测值进行对比,分析其差异及原因。结果表明,采取单、双作物系数法计算的夏玉米需水总量与实测值相对误差分别为14.8%、11.7%,双作物系数法更接近实测值;采取单、双作物系数法2种方法计算的夏玉米逐日及月均需水量具有较好的一致性,相关系数(r)为0.78、0.85。

The crop water requirement （ET） of summer corn was evaluated using single coefficient approach and dual crop coefficient approach （ recommended by FAO-56） under the condition of Anyang City, Henan Province and was compared with observation data. The differ- ences and reasons were analyzed. The result shows that the relative errors of single coefficient approach and dual crop coefficient approach to observation data are 14.8%, 11.7%. Compared to single crop coefficient approach, the calculated value using dual crop coefficient approach is closer to real observation data. However, the difference is insignificant. Daily and monthly crop water requirements of summer corn by the two approaches have good consistency, the correlation coefficient are 0.78 and 0.83, respectively.