1. Pingliang is a prefecture-level city under the jurisdiction of Gansu Province. It is located in the east of Gansu Province, at the eastern foot of Liupan Mountain and the upper reaches of Jinghe River. It is the "Golden Triangle" of the geometric center of the intersection of Shaanxi, Gansu and Ningxia, spanning Longshan (Guanshan), bordering Xianyang in Shaanxi in the east, Dingxi and Baiyin in Gansu in the west, Baoji in Shaanxi and Tianshui in Gansu in the south, and Guyuan in Ningxia and Qingyang in Gansu in the north. ?
Pingliang is an important animal husbandry base and fur distribution center in northwest China, and also the main production base of agricultural and forestry products and animal husbandry in Gansu Province. ?
Pingliang, known as the "Longshang Dry Wharf", is an important town that the ancient "Silk Road" must pass through and is known as "the first city in West Chang 'an" in history. Pingliang has been an important town to protect Sanqin and control Wuyuan since ancient times. It is a "battleground for military strategists" and a traditional commodity distribution center in Longdong. The transportation and military hub of the Central Plains leading to the western regions, the eastern end of the northern line of the ancient Silk Road, is not only a highway hub in the northwest, but also an important transit point for the second passage of the Eurasian Continental Bridge.
2. Geographical environment
Pingliang City is located in the east of Gansu Province, at the junction of three provinces (regions). It is located between 34 54' and 35 43' north latitude, 65 438+008 30' east longitude and 65 438+007 45' east longitude, with an altitude of 890-2857 meters. [6]
Pingliang City, located at the foot of Longdong Mountain and the upper reaches of Jinghe River, is the hub of the ancient northern road. According to the risk of six sets and three customs, it has always been a battleground for military strategists.
3. Climate
Pingliang City Pingliang belongs to the cold temperate and semi-humid area of Jingwei River. In the agricultural climate division, it belongs to the mild and semi-humid agricultural climate zone in Longdong. According to meteorology, the average climate temperature is usually defined as summer when it is more than 22℃, winter when it is less than 10℃, and spring and autumn when it is less than 10℃. Spring and summer 106 days, autumn 77 days, winter 182 days. According to phenological reaction and agricultural activities, four seasons are divided, and the temperature above 0℃ to below 15℃ is designated as spring, above 15℃ as summer, below 15℃ as autumn and below 0℃ as winter. According to this standard, the four seasons are divided into March, April and May in spring, June, July and August in summer, September 10, 1 1 in autumn and 12, 1 and February in winter.
The climate of Pingliang is generally characterized by wet south and dry north, warm east and cool west. Due to the influence of topography and altitude, the vertical difference of climate is obvious. Generally speaking, every elevation increase of 100m shortens the growing season by 5 days, the accumulated temperature above 10℃ decreases 107℃, and the frost-free period decreases by 3. 1 day.
The average annual precipitation in Pingliang City is 5 1 1.2 mm ... The distribution of precipitation in each season is very uneven, and there are few spring rains in winter. It entered the rainy season in late June and ended around 65438+ at the beginning of 10. The main precipitation is concentrated in July, August and September. The interannual variation of precipitation is also great. 1964 has the highest precipitation, reaching 744.5 mm, and 1942 has the lowest precipitation, only 249.9 mm, and there is a dry year (the precipitation is less than 400 mm) every 3 ~ 10 years. A dry year is usually followed by a rainy year (precipitation is 600 mm). Affected by the topography of Longshan residual vein, the regional distribution of precipitation is obvious, but the general trend is decreasing from southwest to northwest. The annual average precipitation in the southwest mountainous areas can reach more than 600 mm, the precipitation in Anguo, Daqin and Xiyang in the northwest is more than 500 mm, and the precipitation in Jinghechuan area and northern tableland area is about 550 mm.
Pingliang City is affected by the westerly circulation in the upper air for most of the year, with an average wind speed of 2.16m/s (level 2), and the maximum wind speed17m/s (level 8) appears 9 times on average, with a maximum of 25 times in the whole year. Northwest wind in autumn and winter, southeast wind or east wind in spring and summer. There are many winds throughout the year, east, east, south, southeast, west, northwest and northwest, forming obvious topographic winds in the same direction as Sichuan Road.