Based on explicating the definition of ecotone, this paper discussed emphatically the distribution and features of joint zone between land and water, transition zone between mountains and plains, and intersection zone...Based on explicating the definition of ecotone, this paper discussed emphatically the distribution and features of joint zone between land and water, transition zone between mountains and plains, and intersection zone between agricultural and animal husbandry regions. The geographic environment of the three ecotones were evaluated, their developing tendency predicted and the corresponding measures to be taken in the 21st century pointed out.展开更多
The area along the Grear Wall in northern Shaanxi between the Loess Plateau and the Ordos Desert is one of the major agrarian-pastoral regions of northwest China. Historically, the land was fought over by the nomadic ...The area along the Grear Wall in northern Shaanxi between the Loess Plateau and the Ordos Desert is one of the major agrarian-pastoral regions of northwest China. Historically, the land was fought over by the nomadic and the agrarian peoples of the region. The Yansui section of the Ming Great Wall and thirty-nine fortified encampments along it were built during fighting between the Mongols and the Han people. As all of them were located along communication lines vital to economic development, they played an important role in politics, the economy and transport over three hundred years of Ming and Qing rule. However, they fell into disuse in the late Qing and the Republican period and are now in ruins. The main reason underlying their decline was that the sites had been chosen for their defensive value, so the subsequent northern expansion of China’s borders and structural changes in the border economy hastened their decline. Thus the rise and fall of these fortified towns at the intersection of the agrarian and the pastoral regions was closely related to imperial political and military activity and was in line with ethnic and tribal movements and migrations and the evolution of civilizations. In sum, the reasons behind the demise of these fortified towns and camps were highly complex and usually involved multiple factors.展开更多
文摘Based on explicating the definition of ecotone, this paper discussed emphatically the distribution and features of joint zone between land and water, transition zone between mountains and plains, and intersection zone between agricultural and animal husbandry regions. The geographic environment of the three ecotones were evaluated, their developing tendency predicted and the corresponding measures to be taken in the 21st century pointed out.
文摘The area along the Grear Wall in northern Shaanxi between the Loess Plateau and the Ordos Desert is one of the major agrarian-pastoral regions of northwest China. Historically, the land was fought over by the nomadic and the agrarian peoples of the region. The Yansui section of the Ming Great Wall and thirty-nine fortified encampments along it were built during fighting between the Mongols and the Han people. As all of them were located along communication lines vital to economic development, they played an important role in politics, the economy and transport over three hundred years of Ming and Qing rule. However, they fell into disuse in the late Qing and the Republican period and are now in ruins. The main reason underlying their decline was that the sites had been chosen for their defensive value, so the subsequent northern expansion of China’s borders and structural changes in the border economy hastened their decline. Thus the rise and fall of these fortified towns at the intersection of the agrarian and the pastoral regions was closely related to imperial political and military activity and was in line with ethnic and tribal movements and migrations and the evolution of civilizations. In sum, the reasons behind the demise of these fortified towns and camps were highly complex and usually involved multiple factors.
