单双作物系数法计算玉米需水量的对比研究

A Comparative Study between Single Crop Coefficient Method and Double Crop Coefficient Method in Calculation of Water Requirement of Maize

基于云南持续干旱对水资源高效利用的要求以及研究作物需水量规律的重要性,利用低纬度高原区的云南省曲靖市的陆良站1990-1992年的逐日气象资料及历史试验资料,采用FAO-56推荐的计算作物需水量的单作物系数法和双作物系数法,计算了陆良站玉米各阶段的需水量,并和实测值进行了对比。结果表明:用单作物系数法和双作物系数法计算的玉米需水量与实测值是十分接近的;在地面覆盖度比较大的情况下,两者差别不大;总体上,两种方法计算的作物需水量具有很好的相关性。

Considering the necessity of efficient utilization of water resources due to the continuous drought in Yunnan Province and the importance of research on water requirement rule of crop, based on the daily meteorological data from 1990 to 1992 and the historical experimental data of Luliang Experimental Station in Qujing City, which is located in the low latitude plateau of Yunnan Province, the water requirements in different growth stages of maize in the station are calculated by using the single crop coefficient method and the double crop coefficient method recommended by FAO-56, respectively. Also, the calculation results are compared with the experimental date. The results show that both the calculation results of the two methods are very close to the experimental date; the difference between them is little under larger ground coverage; overall, the calculating result of water requirement of maize by using the two methods have good correlation.