1, Introduction
Chengde, also known as Jehol, is a prefecture-level city under the jurisdiction of Hebei Province, an international tourist city of Hebei Province approved by the government of Hebei Province, the first batch of national historical and cultural cities, and a regional central city connecting Beijing, Tianjin, Liaoning and Mongolia? . By the end of 2002 1, the whole city has 3 municipal districts, 4 counties and 3 autonomous counties, managing1county-level cities. , with a total area of 395 1 1.89 square kilometers and a permanent population of 3,336,300.
2. Historical evolution
Chengde has a long history and rich multi-ethnic historical and cultural connotations. According to the textual research of unearthed cultural relics, there were traces of human activities in Chengde area as early as the Longshan culture period in the Central Plains.
During the Yin and Zhou Dynasties, this area was inhabited by Shanrong, Donghu and other ethnic minorities, and it was the sphere of influence of Yan Hou. A number of Western Zhou bronzes were unearthed in Zi Ying Village, an isolated island in Lingyuan County, about150km east of Chengde.
3. Location and background
Chengde City is located in the northeast of Hebei Province, with latitude 4012 ′ to 42 37 ′ north and longitude115 54 ′ to1915 ′ east. It is located in the connecting transition zone between North China and Northeast China, close to Beijing and Tianjin.
Climate and mineral resources:
1 climate
Chengde belongs to the monsoon climate zone, and the change of wind direction is obviously seasonal. Although influenced by mountainous terrain, it still has its dominant characteristics after filtering out the changes caused by local factors. In winter12 ~ February, northerly winds predominate, and in summer, southerly winds predominate from June to August. Spring and autumn are the transitional seasons of these two kinds of airflow, with spring near summer and autumn near winter.
In addition to the static wind, the maximum wind direction in the whole year is southwest and northwest. The annual average wind speed1.4 ~ 4.3m/s, and 3.3 ~ 4.3m/s on the dam. The number of windy days throughout the year is 1 1 to 63 days. Fengning, Weichang, Longhua, Chengde and other counties are windy, with a maximum of 63 to 93 days a year. Up to 1 16 days on the dam.
2. Mineral resources
Chengde City is the largest edible fungus production base in northern China, and also an important Chinese herbal medicine production base in northern China. 98 kinds of minerals have been discovered and 50 kinds have been developed and utilized. It is a large vanadium-titanium magnetite resource base in China except Panzhihua.
The proven reserves of vanadium-titanium magnetite are 357 million tons, and the resources of ultra-poor vanadium-titanium magnetite are 7.559 billion tons. The output of gold ranks first in Hebei Province, with rich resources such as molybdenum, silver, copper, lead, zinc, granite and marble.