题干

东汉后期和唐朝前期黄河流域、长江流域县城数量表(单位:座)

时间

区域

东汉后期

唐朝前期

黄河流域

765

669

长江流域

342

611

概述上表反映的县城数量及分布的变化,阐释导致变化的历史原因。

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答案(点此获取答案解析)

变化:从东汉后期至唐朝前期,黄河流域和长江流域县城数量总体有所增加。

东汉后期,县城主要集中在黄河流域,长江流域数量较少;唐朝前期与东汉后期相比,黄河流域县城数量减少,长江流域数量增加。原因:①这一时期,北方战乱频仍,人口大量南迁,黄河流域县城数量减少。②人口南迁加速了南方的开发,使南北经济差距缩小,经济重心逐渐南移,南方县城数量增加。③隋唐时期,社会安定,经济繁荣,县城总体数量增加。

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