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一、研究背景中国东北地区包括辽、吉、黑三省和内蒙古自治区的东部。它位于北半球的中纬度地带,欧亚大陆东端,与中亚大草原的东缘接壤,北界俄罗斯,南邻黄海、渤海湾,西接蒙古,东南部著名的休眠火山长白山绵亘其间,以图们江、鸭绿江为界与朝鲜隔江相望,东越大海,与日本列岛遥相呼应。其地形总体特征是复杂多样,周边群
I. Background China’s northeast region includes the Liao, Ji and Black provinces and the eastern part of the Inner Mongolia Autonomous Region. It is located in the northern hemisphere in the mid-latitude zone, the eastern end of Eurasia, bordering the eastern edge of the Central Asian prairie, the northern boundary of Russia, the Yellow Sea to the south, the Bohai Bay, west of Mongolia, southeast of the famous dormant volcano Changbai Mountain during which, Tumen River, Yalu River and North Korea as a border across the river, the East Vietnam Sea, echoed with the Japanese archipelago. The overall characteristics of the terrain are complex and diverse, the surrounding groups