非充分灌溉中作物——水模型的应用准则研究

The Problems of Appling Models of Crop Responses to Water in Semi-Arid Regions

根据半干旱地区东北通辽,并参照华北呼和浩特两地资料,对全生育期模型和阶段作物—水模型进行了系统的拟合检验。线性模型适应于全生育期相对蒸散和相对产量的关系,单阶段模型为对数和指数关系。FAO所给Ky值与试验拟合结果存在差别,所以Ky应用要以试验结果为准,FAO值可做参考。在半干旱地区,詹森,布兰克,若尔模型较好,本文提出了模型应用的5点指南。

Based on the experimental data from TongLiao in the North-east Chinaand from HuHeHot District in the North of China,Seasonal and stage ofmodels were tested Linear models were suitable to the relationship betweenseasonal ET and grain yield Single growth stage models were developed whi-ch was Logsraithmic or index function Comparing Ky given by FAO with the experimental Ky value,there were differences between them Thus,the app-lication should be depended mainly on experimental Ky FAO values can befor applicable reference Stage models suggested by Blank,Jensen,Steuart werebetter for the application in the semi-arid regions.This paper presented themain application problems and gave five guide-lines for the appliction ofmodels in the semi-arid rigions.