江西省农业自然灾害变化的小波分析

Wavelet Analysis on the Variation of Agricultural Natural Disaster of Jiangxi Province

利用小波变换对江西省1949~2009年农业自然灾害变化率进行多时间尺度分析。结果表明,该省农业自然灾害率的变化存在4、12、36年特征时间尺度和相应的5、15、44年左右的周期性变化特征;小时间尺度的小波系数振幅逐渐增大,说明近年江西农业自然灾害日益频繁。

Multiple time scales analysis was performed on the variation frequency of agricultural natural disaster of Jiangxi Province in 1949-2009 by applying wavelet transform.The results indicated that the variation of agricultural natural disaster rate of this province showed the characteristic time scales of 4,12 and 36 years and corresponding cyclical variation characteristics of about 5,15 and 44 years;the amplitude of wavelet coefficient of little time-scale was increased gradually,indicating that the agricultural natural disaster occurred more and more frequently in Jiangxi in recent years.