摘要
利用吉林省延边地区1949～2010年苹果梨产量资料、延边苹果梨主产区建站以来的气象资料,采用主分量分析、相关系数计算等数理统计方法对吉林省延边冬季冻害指标进行了研究。结果表明:-18℃可以作为苹果梨冬季冻害临界温度。据此临界温度,利用冬季(12～2月)极端最低气温低于-18℃的持续日数、极端最低气温、最大降温幅度及有害积寒作为苹果梨冬季冻害致灾因子,采用主分量叠加各致灾因子的方法得出了苹果梨冬季综合冻害指数。以综合冻害指数为基础,将冬季苹果梨冻害分为轻度、中度、重度、严重4个等级。
The data of production of apple-pear from 1949 to 2010 and the meteorological data of major apple-pear production area in Yanbian area of Jilin Province were collected and analyzed. The freezing injury indexes of apple-pear were studied using the principal component analysis, the correlation coefficient calculations and other methods of mathematical statistics. The research results showed that -18℃ was the critical temperature for apple-pear winter freezing injury. According to the critical temperature, the extreme minimum temperature （ below -18 ℃ from December to February） continuous days, extreme minimum temperature, maximum cooling extent and harmful chilling accumulation were used as the disaster-inducing factors. The comprehensive freezing injury indexes of apple-pear were obtained by using the method of principal component superposition of the hazard. The grades of freezing injury could be divided into four grades： light freezing injury, medium freezing injury, severe freezing injury and extremely severe freezing iniury.
出处
《吉林农业科学》
CSCD
北大核心
2012年第1期57-60,共4页
Journal of Jilin Agricultural Sciences
关键词
苹果梨
冬季
冻害指标
Apple-pear
Winter
Freezing injury index
