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一、突出一个“旱”字本区与其它地区相比,干旱是最显著的特点,也是影响本区发展的主导地理因素。①干旱是客观存在的,是特殊的地理位置所决定的。从“北部内陆”的地理位置,不仅回答了干旱的成因,而且为整个地理内容奠定了基础。本区四周都远离海洋,夏季风影响微弱,又紧邻蒙古高压中心,冬季风强劲,蒸发旺盛,地势虽然较高,但起伏不大,缺乏构成地形雨的条件。所以,本区除甘肃省东南部和内蒙古自治区大兴安岭一带为湿润和
First, to highlight a “dry ” character Compared with other regions in this area, drought is the most significant feature, but also a dominant geographical factor that affects the development of this area. 1 Drought exists objectively and is determined by a special geographical location. The geographic location of the “Northern Inland” not only answers the causes of the drought, but also lays the foundation for the entire geographical content. The area is far away from the sea, and the summer monsoon is weak. It is also close to the Mongolian high-pressure center. The winter monsoon is strong and the evaporation is strong. Although the terrain is relatively high, it does not fluctuate, and it lacks the conditions for formation of topographic rain. Therefore, the areas in the Daxingan Mountains in the southeast of Gansu Province and Inner Mongolia Autonomous Region are moist and