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中国疆域扩展经历了黄河与长江流域两大农耕区的联合、以中国北方农牧交错带为基点的疆域伸缩、突破北方农牧交错带三个阶段,地理环境不仅成为决定每个阶段的核心要素,且在制约人们经济生活方式的同时,影响疆域伸缩。其中年降雨量400毫米等值线所经地带,即中国北方农牧交错带在清以前各个时期,既是疆域变迁的回旋起落之处,也承担着起点与终点的双重角色,突破这条地理界限,将疆土持续而稳定地伸向大西北在清朝前期。
China’s territorial expansion has experienced the union of two farming areas in the Yellow River and the Yangtze River valley. The expansion of the territory with the transitional zone of agriculture and animal husbandry in northern China breaks through the three stages of the ecotone between agriculture and animal husbandry in northern China. The geographical environment has not only become the key factor in determining each stage , And restrict people’s economic life style, while affecting the territory stretching. The annual rainfall of 400 mm contour line, that is, the farming-pastoral transitional zone in northern China during each period before the Qing Dynasty was not only the turning point of the vicissitude of the territory but also assumes the dual role of the starting point and the ending point. Breaking this geographical boundary , The territory of sustained and steady stretch of the Great Northwest in the early Qing Dynasty.