Lanzhou 093 1, Jiayuguan 0937, Jinchang 0935, Baiyin 0943, Tianshui 0938, Wuwei 0935,

Zhangye 0936, Pingliang 0933, Jiuquan 0937, Qingyang 0934, Dingxi 0932, Longnan 0939,

Linxia Hui Autonomous Prefecture 0930? Gannan Tibetan Autonomous Prefecture 094 1.

Gansu province

Gansu Province, referred to as Gan for short, is one of the provincial administrative units in China, located in the upper reaches of the Yellow River, with Lanzhou as the capital. Gansu is based on the initials of Ganzhou (now Zhangye) and Suzhou (now Jiuquan). Because Xixia once set up Gansu military sub-division, Gansu Province was set up in Yuan Dynasty, referred to as Gansu; Because most of the province is in the west of Longshan (Liupan Mountain), Longyou Road was set up here in the Tang Dynasty, so it is also called Longyan for short.

Location context

The climate in Gansu is quite different, and the ecological environment is complex and diverse.

Gansu is located in the deep inland of northwest China, where warm and humid air currents are difficult to reach and there are few opportunities for rainfall. The climate in most areas is dry and belongs to temperate monsoon climate, which is continental. Winter is cold and long, the boundary between spring and summer is unclear, summer is short, the temperature is high, and the temperature drops quickly in autumn. The annual average temperature in the whole province is between 0 ~ 16℃, with different altitudes, large temperature difference, abundant sunshine and large daily temperature difference.

The annual precipitation in all parts of the province is 36.6 ~ 734.9 mm, decreasing from southeast to northwest. The precipitation in the west of Wushaoling is obviously reduced, and the precipitation in Longnan Mountain area and the east of Qilian Mountain is more. Affected by the monsoon, precipitation is mostly concentrated in June-August, accounting for 50%-70% of the annual precipitation. The frost-free period in the province varies greatly from place to place. Longnan Valley is generally about 280 days, and Gannan Plateau is the shortest, only 140 days. The altitude in most places is between 1500m and 3000m, and the annual rainfall is about 300mm (40-800mm). [3]

topography

Gansu is located at the intersection of Loess Plateau, Qinghai-Tibet Plateau and Inner Mongolia Plateau. The territory is characterized by complex topography, vertical and horizontal mountains, and great disparity in elevation, which integrates mountains, basins, plains, deserts and Gobi, and belongs to mountainous plateau landform. Gansu's landform is complex and diverse, with mountains, plateaus, Pingchuan, river valleys, deserts and Gobi distributed alternately. The terrain is inclined from southwest to northeast, long and narrow, with a length of 1659 km from east to west and a width of 530 km from north to south, which can be roughly divided into six distinctive regions. Most of them are above 1000 meters above sea level, surrounded by mountains. There are six plates in the north.

Helongshou Mountain; Minshan, Qinling and Ziwuling in the east; Altun Mountain, west of Qilian Mountain; Nanrang Qingniling.

Gansu is a mountainous province. The most important mountain ranges are Qilian Mountain, Wushaoling Mountain and Liupanshan Mountain, followed by Altun Mountain, Mazong Mountain, Heli Mountain, Longshou Mountain, Xiqiao Mountain and Ziwuling Mountain, mostly in the northwest-southeast direction. Most of the forest resources in the province are concentrated in these mountainous areas, and most rivers also form their own diversion sources from these mountainous areas.

Longnan Mountain:

The mountains are stacked, the mountains are high and the valleys are deep, the vegetation is rich, and there are clear streams everywhere. This area generally includes the mountainous areas south of Weishui, Lintan and east of Diebu, which is the western extension of Qinling Mountains. The hills are high in the west and low in the east, the green hills are opposite, the streams are surging, and the peaks are steep, just like the scenery in the south of the Yangtze River and the mountains are winding.

Longdong and the Central Loess Plateau

Longdong and the central part of the Loess Plateau are located in the central and eastern part of Gansu Province, starting from the Shaanxi-Gansu border in the east and ending at Wushaoling in the west. The ancestors of the Chinese nation were born here in history, and the homes of the descendants of the Chinese people were built here. With the changes of the earth's crust, wars and disasters over hundreds of millions of years, the Loess Plateau is fragmented, especially in the central part of Dingxi, and it has become one of the most barren places in China. However, Longdong and the central part of the Loess Plateau are rich in oil and coal resources.

Gannan plateau

Gannan Plateau is the "roof of the world"-a corner of the eastern edge of the Qinghai-Tibet Plateau, with high terrain and an average elevation of more than 3,200 meters, which is a typical plateau area. Here, the grass beach is broad, the water plants are rich and beautiful, and Mazhuang cattle are fat, which is one of the main animal husbandry bases in Gansu Province.

Hexi Corridor

Hexi Corridor is located at the northern foot of Qilian Mountain and the southern foot of Beishan Mountain, starting from Wushaoling in the east and reaching the border of Gan Xin in the west. It is a long and narrow strip inclined from east to west and from south to north. The altitude is 1000 ~ 1500m, the length is about 1000m, and the width varies from several kilometers to several hundred kilometers. Hexi Corridor is a famous Gobi oasis with flat terrain, good mechanized farming conditions, sufficient light and heat, and abundant water resources. Agriculture has broad prospects for development and is the main commodity grain base in Gansu.

Qilian mountain land

Qilian Mountain is located in the south of Hexi Corridor, with a total length of 1000 kilometers, most of which are above 3500 meters above sea level. It is a natural solid reservoir in Hexi Corridor, with obvious vertical distribution of vegetation, desert, grassland, forest and snow, forming a colorful three-dimensional picture.

North of Hexi corridor

The land north of Hexi Corridor is more than 600 kilometers long from east to west, with an altitude of 1000 ~ 3600 meters, commonly known as Beishan. The land here is close to Tengger Desert and Badain Jaran Desert. The wind and sand are heavy, the rocks are bare and the desert is contiguous. This is a difficult and sparsely populated place. You can enjoy the scenery beyond the Great Wall of "the desert is lonely and the long river sets the yen".