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华北平原是我国主要的棉花生产基地之一,产量约占全国总产量的40%。因此,其棉花产量的丰、歉对我国国民经济有着举足轻重韵影响。但该区棉花产量低而不稳,历年变化幅度大,以河南省为例,从五十年代到七十年代,单产低于25公斤,有的年份仅有10多公斤;相邻两年间产量波动也很显著,如1980年产量为30公斤,而1979年仅14公斤,相差16公斤。上述产量随时间和地域波动的事实表明:棉花产量丰、歉除了与品种和农业技术措施有关外,在我国当前的情况下,气候条件也是主要因素之一。因此,必须找出产量波动的气候原因,以便于生产部门根据年度长期天气预报,
The North China Plain is one of China’s major cotton production bases, with output accounting for about 40% of the country’s total output. Therefore, the abundance and apology of its cotton production have an important influence on the national economy in our country. However, the yield of cotton in this area is low and unstable, with large changes over the years. Taking Henan Province as an example, from the 1950s to the 1970s, the yield per unit area was less than 25 kg and in some other years it was only 10 kg. The output of the two adjacent years Fluctuations are also significant, such as 30 kg in 1980 and 14 kg in 1979, a difference of 16 kg. The fact that the above-mentioned output fluctuates with time and in different regions shows that cotton production is abundant and apricot except for species and agricultural technical measures. In the current situation of our country, climatic conditions are also one of the major factors. Therefore, it is necessary to find out the climate reasons for the fluctuation of output so that the production department can forecast the long-term annual weather forecast,