Where is Yan Liang? Is the place good? How about flying to the west?
Yanliang District is located in the hinterland of the Guanzhong Plain, 50 kilometers away from the center of Xi'an. The total area is 240 square kilometers/244.4 square kilometers. The total population is 240,000 (2003).
The postal code of the District People’s Government is: 710089. Administrative division code: 610114. Area code: 029
It was established as a district on August 1, 1966.
In 2000, Yanliang District governed 2 streets, 3 towns, and 3 townships. According to the fifth census data: the total population is 235,672, including the population (persons) of each township: Fenghuang Road Street 43555 Xinhua Road Street 50427 Wutun Town 34321 Kangqiao Town 21718 Guanshan Town 30889 Zhenxing Township 21438 Xinxing Township 13675 Beitun Township 19649.
Yanliang District is located in the northeast of central Guanzhong, between 340 35′11″~340 44′37″ north latitude and 1090 08′54″~1090 25′37″ east longitude. It borders Weinan City to the east; Sanyuan County to the west; Qinghe River to the south, facing Lintong District; and Jingshan Plateau to the north, adjacent to Fuping County. It is about 12 kilometers wide from north to south and 25 kilometers long from east to west. The eastern end of the district is Qiaojia Village, Guanshan Town, the western end is Guanliu Village, Zhenxing Subdistrict Office, the southernmost end is Qiaodong Village, Beitun Subdistrict Office, and the northernmost end is Xiwang Village, Guanshan Town. The plane outline is slightly rectangular from east to west, shaped like a lying cow, with its head east and tail west, and its jurisdiction covers an area of 244.4 square kilometers.
This district is an outlying suburb under the jurisdiction of Xi'an City, located to the north of the Wei River in the northeast of the city, 50 kilometers away from the urban center. The territory has a warm temperate semi-humid monsoon climate with four distinct seasons; three rivers including the Ishikawa River belong to the Weihe River system of the Yellow River Basin; the surface loess covers a wide and deep area, with rich soil types, a long history of farming, and rich products. The superior geographical environment and rich natural resources provide a material foundation for the development of agriculture, aviation industry and other industries in the region.
Geology
The geology of this area belongs to the Quaternary strata dating back about 2.5 million years ago to the present. The lithology is coarse-grained sediments mainly composed of sand, pebbles and gravels, and soil-like accumulations mainly composed of loess, with wind deposits, alluvial deposits and flood deposits as the main sources; it is also caused by the gravity accumulation of glaciers and landslides. The sedimentary thickness gradually increases from southeast to northwest, with an average thickness of 840 meters.
The geological fault structure in the territory belongs to the Kouzhen-Guanshan fault zone in the Weihe fault depression area. It runs east-west across the northern part of the Weihe Plain from Kouzhen, Jingyang County to Guanshan in the territory. It is composed of a number of roughly parallel and diagonal faults. Formed in the Sinian Period. It is compressive and torsional in the early stage and tensile torsional in the late stage. It is a hidden active fault zone. The rate of decline is 2 mm/year, which is obvious on satellite images, and geophysical exploration shows that it is an abnormally dense gravity zone. The landform forms obvious loess slopes. This fault zone is mainly composed of the Yanliang-Guanshan fault within the territory.
Landform
The landform characteristics of this area are: first, it is high in the north and low in the south, with a ladder-like lowering, with little difference. The highest point is at East Taipingzhuang, Zhenxing Township, in the Loess Plateau in the north, with an altitude of 483.2 meters; the lowest point is at Erlongkou, the intersection of Shichuan River and Qinghe River in Wutun Town, with an altitude of 351.7 meters. The maximum relative height difference within the district is only 131.5 meters. Second, controlled by the direction of the Qinling Mountains and the Weihe River, various landforms within the territory extend east-west, alternating north-south, and are distributed in obvious strips.
The landforms in the area mainly include two basic forms: plains and loess plateaus.
Climate
The area is located in the mid-latitude inland zone and is affected by the Qinling Mountains in the south, so it has a continental temperate semi-arid and semi-humid climate. The four seasons are dry, wet, cold and warm. Spring is mild and windy, with early recovery and rapid temperature rise, and is prone to strong winds, floating dust, spring drought, and cold wave cooling. Summer is hot, with high temperatures, sufficient sunshine, concentrated rainfall and drought, and autumn cools quickly and is cooler. , humid, with frequent rains; winters are cold, dry, with little rain or snow.
Hydrology
There are three main rivers passing through the territory, namely the Shichuan River, the Qing River, and the Weizi River. They all originate from the Weibei Mountains and flow from northwest to southeast through the plain areas of the territory into the Wei River. , all belong to the Yellow River system.
Soil
The natural soil in the territory is cinnamon soil, which is the northwest extension of the vast cinnamon soil belt in North my country. Due to the long history of agriculture in the territory, during the long-term cultivation and maturation process of humans, especially under the accumulation of soil and manure, the original cinnamon soil gradually evolved into loam soil. Differences in landform types and hydrogeological conditions, as well as the length of the farming history, have resulted in soil types such as loess soil, loess soil, and silt. The soil area of the district is 267,788.4 acres, accounting for 73% of the total area of the district.
Vegetation
The vegetation in the territory has a long history and is of various types. It was originally a single-origin forest vegetation. As early as 8,000 years ago, during the Laoguantai Culture period, ancestors had practiced planting along the Ishikawa River. Production activities: During the Yangshao Culture period 6,000 to 7,000 years ago, ancestors reclaimed and planted this land, continuously expanded and developed cultivated vegetation, and gradually changed the appearance of natural vegetation. Therefore, the characteristics of the vegetation in the entire region are: good natural conditions, but insufficient resources, while artificial vegetation has great potential.
Animals
Most of the territory is plains, with only the northern part being the plateau area, with many ravines and few wild animal species, including wolves, weasels, foxes, hares, badgers, bats, and rats. Class etc.
Poultry wild birds mainly include: sparrows, magpies, wild pigeons, turtle doves, cuckoos, swallows, woodpeckers, crows, kites, wild geese, owls, thrushes, larks, goshawks, white-headed owls, orioles, quails, and wild ducks. wait.
Insects
There are ladybugs (aphids), Trichogramma (cotton aphids), Cabbage Spodoptera exigua (cotton bollworms), ants, mosquitoes , flies, bees, geckos, frogs, giant toads, snakes, silkworms, scorpions, centipedes, etc., as well as many agricultural and forestry pests.
Aquatic animals
Fish in the territory are distributed in Shichuan, Weizi River and Qinghe River. The main species include carp, grass carp, silver carp, crucian carp, soft-shelled turtle, crab, clam, shrimp, etc. After the 1960s, due to drying up of rivers, pollution and other reasons, the ecology was destroyed and there were very few fish. However, with the prosperity of artificial breeding industry, there were more and more aquatic animals.
Natural disasters
There have been many natural disasters in the territory since ancient times, mainly droughts, floods, wind disasters, hail, frost, insect disasters, earthquakes, etc. Among them: drought accounts for the total number of natural disasters. 83% of the total amount, waterlogging accounted for 9.1%, wind disaster accounted for 7%, hail and other disasters accounted for 0.9%