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一、小麦冻害监测诊断工作的意义北京地区除1957、1961、1968、1977、1980年度发生过严重冻害和大幅减产外,1966、1974、1981、1984年等还发生过中度以上的冻害,但是这几年由于冻害予报比较准确,采取相应予防措施起到了防灾增产的作用.所以对于严重冻害年,成功的做出超长期和长期予报后,如能辅之以中短期补充予报,可以提高予报小麦冻害的准确率.小麦冻害具有以下两个特点:(一)冻害具有累积性低温固然是小麦主要的直接杀伤因素,但是北京地区除浅播麦苗外,很少能出现达到大部
First, the significance of the monitoring and diagnosis of wheat frost damage Beijing in 1957, 1961, 1968, 1977, severe freezing injury occurred in the year and a substantial cut in production, the 1966, 1974, 1981, 1984, etc. also occurred over the moderate frost damage, but In recent years, due to frost damage reported to be more accurate, to take appropriate preventive measures played a role in disaster prevention and increase production, so for severe frostbite years, the successful long-term and long-term to make the report, if supplemented by short-term supplementary report , Can improve the accuracy rate of wheat frost damage to wheat.The frost damage of wheat has the following two characteristics: (I) Although the frost damage has a cumulative low temperature, it is the main direct killing factor of wheat, however, except for the sowing wheat in Beijing, seldom emerge Mostly