【摘要】 以1949～2017年干旱及灾害发生的事实为依据,重构并分析了近70a中国干旱灾害的时空格局。研究结果:1949～1979年31a期间发生重旱以上的频率为16.1%,而1980～2017年38a期间发生重旱以上的频率为52.6%,是1979年以前的3倍以上,时间尺度上干旱发生频率在增加。干旱灾害空间格局南北各异,北方地区重旱以上区域分布在内蒙古、山西、辽宁、河北、陕西、甘肃和宁夏,而南方地区易发生轻旱和中旱,湖南、四川、贵州、云南等省发生重旱以上的频率亦呈现增加趋势。随着气候变暖和人类活动等因素的影响,中国干旱发生的范围整体向西南扩展,干旱灾害影响程度在加重。更多还原

【Abstract】 The article has reconstructed and analyzed the spatio-temporal pattern of drought disaster in China in recent seventy years based on the data of the drought and relevant disaster occured from 1949 to 2017 in China. The results show that drought frequency is on the increase,the heavy disaster frequency is 16.1% in 1949～1979,and it is 52.6% in 1980～2017 that is 3 times before 1979. The spatial pattern of drought disaster takes on discrepancy between the north and south of China,in the north of the country,the heavy disaster area mainly lies in Inner Mongolia,Shanxi,Liaoning,Hebei,Shaanxi,Gansu and Ningxia;in the south of the country,the light & middle disaster takes place easily,and the heavy disaster frequency is on the increase,mainly lies in Hunan,Sichuan,Guizhou and Yunan. The range of drought occurrence is extending to the southwest as a whole,the degree of drought disaster is aggravating in China under the impacts of both global climate warming and the human activity.更多还原