Spatio-temporal Distribution of Overcast and Rainy Days Disasters in the Vigorous Growing Period and Mature Period of Yuxi Flue-cured Tobacco
In order to analyze the spatial and temporal distribution characteristics of overcast and rainy days disasters for Yuxi Flue-cured Tobacco in the vigorous growing period and mature period.The meteorological data(precipitation and sunshine du-ration)in Yuxi,Yunnan Province,from 1990 to 2019 were selected and the variation characteristics of the average annual num-ber,average days,frequency and scope of overcast and rainy days in the vigorous growing period and mature period of flue-cured tobacco were analyzed combined with disaster grade indexes.Based on climate propensity rate and Mann-Kendall test,the interannual evolution of disaster occurrence was discussed.The results showed that the average annual numbers of overcast and rainy days disasters in the vigorous growing period and mature period of Flue-cured tobacco exhibited a decreasing trend.The frequency and coverage of disasters in each grade showed mild＞moderate＞severe,and the coverage of overcast and rainy days disasters in the mature period was higher than that of the vigorous growing period.Although the frequency of disasters showed a decreasing trend in both growth periods,the variation trend was not significant.Spatially,the average annual num-bers,average days and frequency(except for the mature period)of overcast and rainy days disaster showed lower values in southwest and higher values in northeast,and the coverage and extent in the mature period was greater than that in the vigor-ous growing period.The average annual numbers of overcast and rainy days in the vigorous growing period significantly and positively correlated with the frequency of occurrence,and the average annual numbers of disasters in the mature period signifi cantly and positively correlated with the average days.
flue-cured tobaccoovercast and rainy daysvigorous growing periodmature period
万方数据
维普
