通过对明代晋陕峡谷区历史资料的搜集整理,统计分析了该地区干旱灾害的时空分布特征.结果表明,明代晋陕峡谷区共发生干旱灾害143次,平均每1.93 a发生1次,其中轻度干旱灾害、中度干旱灾害、重度干旱灾害、特大干旱灾害发生分别占干旱灾害总数的13.99%、41.26%、16.78%、27.97%,各级干旱灾害频次发生的周期分别为5 a、18 a、28 a、52 a左右.在时间上,干旱灾害发生频次呈现出波动性增加趋势,大致可分为干旱灾害少发期-平稳增加期-缓慢增加3个阶段,且主要发生在夏季.在空间上,研究区内干旱灾害发生频次呈现出由北向南增加的趋势.干旱灾害对社会的影响主要表现人口、经济以及社会秩序3个方面.%The temporal and spatial distribution characteristics of drought disasters in the valley area of Shanxi-Shaanxi in Ming dynasty were statistically analyzed through the collection and collation of related historical data. The results showed that:in the valley area of Shanxi-Shaanxi in Ming dynasty,a total of 143 times of drought disasters occurred,once every 1.93 years in av-erage;the mild drought,moderate drought,severe drought,and severest drought disasters accounted for 13. 99%,41. 26%, 16.78% and 27.97% of all drought disasters,respectively,and their occurrence periodicity was about 5 a,18 a,28 a and 52 a, separately. In the temporal distribution,the occurrence frequency of drought disasters showed a fluctuant increasing trend,which could be roughly divided into three stages:less occurrence stage,steady increasing stage and slow growth stage,and drought dis-asters occurred mainly in summer. In the spatial distribution,the occurrence frequency of drought disasters in the studied area re-vealed a trend of increasing from the north to the south. The impacts of drought disasters on the society was reflected mainly in the following three aspects:population,economy and social order.
展开▼
