Variation characteristics of main meteorological disasters and their effects on yield of 'Yali'pear in Cangzhou,Hebei Province
Based on the meteorological observation data,developmental period data and yield data from the main production area of 'Yali'pear in Cangzhou,the climatic slope,Mann-Kendall mutation test and multiple linear regression were used,the characteristics of main meteorological disasters and their contribution to yield formation during'Yali'pear growing period in Cangzhou were analyzed.The results showed that:in the past 50 years,the trend of frost injury in flowering period was reduced,and the frequency and intensity of frost injury were mutated in 1995 and 2002 respectively.The trend of continuous overcast and rain in florescence decreased,especially after the 21st century.After the 21st century,the number of days with high temperature in fruit expansion period increased,extreme high temperature occurred frequently,and the trend of high temperature damage was aggravated.After the 21st century,the number of sunshine hours in the mature period decreased significantly,resulting in an increase in the frequency of even rainy days,an increase in extremes,and an aggravating trend of even rainy days.During the growing period,the hail disaster tended to decrease,and the hail disaster had a sudden change around 1998.The order of weight of five meteorological disasters on yield formation of 'Yali'pear was hail during the growing period＞high temperature damage during fruit expansion period＞continuous rain during fruit mature period＞freezing damage during flowering period＞continuous rain during flowering period.
'Yali'pearmeteorological disastersclimate changemutationinfluence the weight
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