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南宋时期(1127-1279年)至少有81年发生过疫灾,疫灾频度53.29%。朝代上以宁宗、高宗、孝宗三朝的疫灾最为频繁;季节上以春夏季节为疫灾高发期,秋冬季节疫灾较少发生;趋势上疫灾频度略有下降趋势,但表现为2个波长为70年的波动周期,十年疫灾指数曲线呈“W”型,疫灾广度的年度变化呈脉冲状波动,阶段性特征明显。南宋时期全国至少有241个县发生过疫灾,其中71.37%分布于人口相对稠密的浙西、福建、淮西、浙东、江东、江西、淮东等东部诸路;疫灾严重程度从东部沿海向西部内陆递减,浙西路是全国疫灾最严重的地区;各路疫灾的严重性与人口密度呈显著正相关。从总体分布看,南宋地区的疫灾比金元地区严重,且集中分布于淮河以南今光山-大余一线以东的地区;人口密度高值区也是疫灾频度高值区,长江三角洲是全国疫灾最频繁的地区;当时全国的疫灾中心有今杭州、海宁、湖州、苏州、绍兴等城市。
Southern Song Dynasty (1127-1279) at least 81 years have occurred in the epidemic, the frequency of epidemics 53.29%. In the dynasties, Ningzong, Gaozong and Xiaozong dynasties had the most frequent epidemics. In spring and summer seasons, seasons with high frequency of floods and seasons with less frequent epidemics occurred in autumn and winter. For two wave periods of 70 years, the ten-year epidemic index curve showed a “W” shape. The annual variation of the epidemic range fluctuated in a pulsating manner with obvious stage characteristics. In the Southern Song Dynasty, at least 241 counties were affected by the epidemic, of which 71.37% were distributed in the relatively densely populated eastern Zhejiang, Fujian, Huaixi, eastern Zhejiang, Jiangdong, Jiangxi, Huai-Dong and other eastern roads; the severity of the epidemic rose from the east Coastal decline to the west inland, western Zhejiang Road is the most serious epidemic areas; the seriousness of the various plagues and population density was significantly positively correlated. In terms of the overall distribution, the epidemic in the Southern Song Dynasty was more serious than that in the Jin-Yuan area, and it was concentrated in the area east of the current Guang-Shan-Dayu line to the south of the Huaihe River. The high-density area of high population density was also the high-frequency area for epidemic-prone areas. The Yangtze River Delta It is the most frequently affected area in the country. At that time, the epidemic centers in China were now in cities such as Hangzhou, Haining, Huzhou, Suzhou and Shaoxing.