环渤海地区500年来的旱涝变化及其区域分异

用研究区１４７０～１９８５年的旱涝等级资料，划分了该地区５００年来旱涝变化的７个阶段，讨论了不同阶段间旱涝型的变化及其旱涝型区域分异意义。结果表明，５００年来研究区有４类主要旱涝型，各型旱涝在不同阶段的重要程度及场型特征有较大差异，深刻反映了该地区５００年来旱涝区域分异特征的变化。通过对５００年来旱涝变化与温度变化的对比发现，较温暖期，研究区的旱涝型及旱涝区域分异格局较多变，旱涝变化的区域差异性较

Thedry/wet changes of the surrounding area of Bohai Sea and its regional differentiationfeatures during the past 500 years

The dry/wet changes of surrounding area of Bohai Sea during past 500 years are divided into 7 stages, based on dry/wet indexes (D/W)of this area from 1470 to 1985 Then, the changes of dry/wet spatial types(D/WST) and its related dry/wet regional differentiation (D/WRD) features among different stages are analyzed. The results show that there are 4 main kinds of D/WST in this area, whose notability and spatial distribution features in different stages are apparently different, which reflects, very well, the changing process of the D/WRD of this region in past 500 years. Further analysis also presents that, in warmer period, the D/WST and the D/WRD patterns are relatively unsteady, meanwhile, the dry/wet changing difference among different parts of the region is relatively great, but, in colder period, it is just on the contrary. However, in the most severely cold period of the Little Ice Age, the area's D/WST and the D/WRD patterns are very unsteady, and its D/WRD extent is also the highest in the whole past 500 years.