摘要
农作物产量大面积大幅度的波动是人们极为关注的问题。经验表明,这种波动与天气气候有非常密切的关系。我国从1958年人民公社化以来,农业生产条件起了很大变化,尤其是农田水利获得了明显的改善。现在要问:近若干年来,产量对气象条件的依赖性究竟怎样?
Effects of meteorological factors on winter wheat yield in peking district were analysed quantitatively on the basis of the winter wheat yields and the meteorological data with a total of 108 station years.Regression equation in estimating yields was introduced by means of applying orthogonal polynomial and stepwise regression technique.The multiple correlation cofficient was 0.83.The influence of meteorological element distribution in particular time seemed to be more important than that in the whole growing period.The effect of meteorological factors reached its maximum value during pre-winter&milk grain stages.Among those factors such as illumination,precipitation and temperature,the temperature showed to be the most important one with its maximum positive effect in pre-winter and maximum negative effect in milk grain stages,The ettect of precipitaion in recent years had significantly decreased as compared with the years before 1958.During emergence and milk grain stages,however,there was still a lack of water,it was emphasized that some appropriate agrotechnical measures such as early sowing and rational irrigation should be of great importance.
作者
王世耆
曹永华
蔡泳慈
Wang Shih-chi;Tsou Yung-hua;Tsai Yung-tzu(Chinese Academy of Agricultural Sciences)
出处
《中国农业科学》
1979年第1期10-18,共9页
Scientia Agricultura Sinica
