What are the products of the topography and geographical features of Dazhou?

Dazhou is a prefecture-level city in Sichuan Province. 1999 was renamed from the former Dachuan area with the approval of the State Council. Dazhou is also called "Big City". Located in the northeast of Sichuan, at the southern foot of Daba Mountain. It is a populous city, a big agricultural city and an important industrial town in Sichuan Province, and has the reputation of "Pearl of East Sichuan", "Gas Capital of China" and "Hometown of Ba people". There is also a large area of gardens, which have been rated as "Garden City in Sichuan Province" and "Model City for Environmental Protection in Sichuan Province". At present, Dazhou is actively striving for "national health city, national garden city, civilized city in Sichuan Province, model city with beautiful environment in Sichuan Province and forest city in Sichuan Province". The total area of Dazhou is 1659 1 km2, and it governs 1 municipal districts, 5 counties and 1 county-level cities. During the Twelfth Five-Year Plan period, Dazhou will become one of the eleven mega-cities cultivated in Sichuan.

Dazhou is high in the northeast (Daba Mountain area) and low in the southwest (basin hilly area). The highest point is Datuanbao, Dazhou Township, Jizhong County, with an altitude of 2458.3 meters; The lowest place is Tianguan Village, Wang Xi Township, Quxian County, with an altitude of 222 meters. Daba Mountain lies in the north of Wanyuan Xuanhan, and Mingyue Mountain, Tongluo Mountain and Huafu Mountain run through the north and south, dividing the city into three parts: mountains, hills and flat dams. Mountain area accounts for 70.70%, hills account for 28. 10%, and flat dams account for 1.20%. The northern mountainous area is severely cut and steep, forming a landform unit of middle and low mountains; The south-central part is relatively flat, forming an equi-valley landform unit.

Geomorphological features

Dabashan mountain

The watershed between Jialing River and Hanjiang River, and the geographical dividing line between Sichuan Basin and Hanzhong Basin. In a narrow sense, Daba Mountain only refers to Micang Mountain and Daba Mountain in the border areas of Sichuan, Shaanxi and Hubei provinces. It stretches for more than 500 kilometers from east to west, so it is called Li Qian. Bashan for short. Daba Mountain in a broad sense is the general name of the mountainous areas bordering Sichuan, Daba Mountain, Gansu, Shaanxi and Hubei provinces, including Motianling in the west of Micang Mountain and Shennongjia in the east of Daba Mountain. Daba Mountain lies between the Qinling geosyncline in the north and the Sichuan platform syncline in the south. Because of the control of the north-south tectonic line, the mountain presents a series of regular parallel fold belts composed of anticlines and synclines, but the east and west are slightly north and the middle is slightly south, so it is called Dabashan arc fold belt. The strata are ancient, mainly limestone, dolomite, metamorphic rocks and sandstone, with granite distributed locally. The first two karst landforms, such as multi-peak cluster, karst cave and underground river, are famous as Guangyuan Longdong Cave, Wangcang Huang Yang Cave and Tongjiang Zhongfeng Cave. The ridge is composed of hard crystalline limestone, which is magnificent after rising and denudation. It is about 2000 meters above sea level, 2797 meters away from Wuxi Taiping Mountain and 3 105.4 meters away from Hubei Shennongjia, which is the highest.

Huayingshan

Huaying Mountain, which originated at the southern foot of Daba Mountain, is the boundary mountain between parallel folded ridges and valleys in eastern Sichuan and hills in central Sichuan. From northeast to southwest, it spans Dazhou, Guang 'an, Chongqing, Neijiang, Zigong, Luzhou and Yibin, with a total length of 325 kilometers. Huaying Mountain is named after "the snow on the top of the mountain looks like Qiong Yao spreading the ground and Jing Yu spreading the mountain". Huaying Mountain enters the northeast of Guang 'an District from the south of Quxian County, reaches Baoding at the junction of Linshui County and Huaying City in the south, and extends to Yubei District and Hechuan District of Chongqing. Huaying Mountain is about 70 kilometers long in Guang 'an, generally 6 kilometers wide and 9 kilometers wide at its widest point. From Linshui Temple Liangzi to Baoding, it is the highest part of Huaying Mountain, with an altitude of1704m, and it is also the highest peak in Sichuan Basin. Huaying Mountain is rich in mineral resources, dense forests and a wide variety of animals, and its natural and cultural landscape is of great tourism development value. 1993, Huaying Mountain was listed as a provincial-level scenic spot.

Tongluoshan

Tongluo Mountain Tongluo Mountain is the second mountain range in the parallel folded valley area in eastern Sichuan. It starts at the northern end of Pushan Mountain in Lei Yin, Daxian County, and runs northeast to southwest, passing through Dazhou, Dazhu County, Linshui County, Changshou District, Yubei District, Nan 'an District, Banan District and Qijiang District in Chongqing, and ends at Tiantai Mountain on the north bank of Qijiang River. The total length is 260 kilometers, the width is 5 kilometers-10 kilometers, and the general elevation is 600 meters-1000 meters. The highest peak is Feng Wan Mountain in Longan Town, Linshui County, with an altitude of1054m. Because the Yangtze River passes through the mountains to the east of Chongqing, Tongluo Gorge is formed, and the river in the gorge hits the stone like the sound of Tongluo, hence the name Tongluo Mountain. Tongluo Mountain enters Linshui County from Daancao in Dazhu County, passing through Xinzhen, Taihe, Lengjia, Chang 'an, Liangban, Jiu Feng, Yao Feng and Tan Yao. It is about 65 kilometers long, including a section from Feng Wan Mountain to Xianying Mountain. The mountains are steep and the valleys are deep. It is the highest terrain in Tongluo Mountain. The axis of anticline has been eroded for a long time, showing the shape of "one mountain, two ridges and one trough". There are many residual hills, karst depressions and sinkholes in the trough, which has a typical karst landscape. The valleys such as Daping, Guiren trough, beam slab and Changjiacao are flat and open, with dense population, fertile land and rich products. On both sides of the valley, there are caves everywhere, especially in the area from Jiu Feng to the Little Three Gorges of Yulin River. There are more than 30 caves, among which Jiulong Cave, Moon Cave, Lanjiadong, Hejiadong, Lion Cave and Xianren Cave have the best scenery.

Moon Mountain

Mingyue Mountain is the third mountain range in the parallel folded valley in eastern Sichuan. It starts from Kaijiang County in the north and moves from northeast to southwest. It passes through Dazhou, Liangping, Dazhu, Linshui, Dianjiang, Changshou, Yubei and other counties, and ends at Yongxing Field in Banan District. The total length is 232 kilometers, the width is 4 kilometers to 6 kilometers, and the general altitude is 700 meters to 1000 meters. Because the Yangtze River crosses the mountains between Yubei District and Banan District, it forms a canyon. There is a round hole like a full moon on the cliff on the bank of the canyon, so it is called Yueming Gorge Valley, and this mountain is named after the canyon.

hydrology

Rivers in Dazhou mainly belong to the Jialing River system, a tributary of the Yangtze River, which originates from Daba Mountain and is distributed in a dendritic form from north to south. Heqian River, Zhonghe River and Houhe River join Zhouhe River in Sanhui Town, Quxian County, and then join Bahe River in Qujiang River, and flow southward for 300 kilometers to join the Yangtze River. There are 53 rivers with a drainage area exceeding 1000 square kilometers, and there are 15 major rivers with a drainage area exceeding1000 square kilometers. * * * There are nine navigable rivers, including Qujiang, Zhouhe, Bahe, He Qian, Houhe, Zhonghe, Tiexi, Qingxi and Lingang rivers, which basically form a waterway transportation network with Qujiang, Zhouhe and Bahe as the main streams, covering four counties (cities) in the city. The navigation mileage of each river is different, and the capacity is below100t.

Qujiang

Qujiang River belongs to Jialing River system. There are many tributaries of Jialing River, and the largest two are Fujiang and Qujiang. Qujiang originates from Daba Mountain, also known as diving, and flows through Bazhong and Dazhou until Sanhui Town in Quxian County, which is called Qujiang, with a total length of 720 kilometers. Qujiang starts from Sanhui Town, Quxian County, and flows through 8 towns including Sanhui District, Tuxi District, Liuxi District, Linba District, Suburb, Qujiang Town, Xiandu District and Langya District, with a total of 265,438+0 towns, including Yongxing River, Guixi River, Liujiang River and Zhongtan successively. Leave the country from Wajiao Beach in Langya Township at the southernmost tip of Quxian County, enter Qinlao Village in Xiaoxi Township of Guang 'an County, obliquely cross the central part of Guang 'an County from northeast to southwest, flow through Hengsheng District, Stalagmite District, Guange District, Daicheng District, Kwun Tong District, Xiexing District, Guangfu District and Huaying City, and enter Zhonghe District and Luodu District of Yuechi County from Laojun Village in Hualong Township of Guangfu District. It asked about Linxi River, Luodu River, Xinmin River and Qujiang River which originated from Huaying Mountain. They left the country at Danxikou, Shunliangzhai Village, Sailong Township, Yuechi County, and entered the northeast of Hechuan District, passing through incense burners, docks, mosquito dragons, ancient cities, Sun Jia, Weixi, Shuanghuai and Laimen in five towns of Weixi, Longshi, Xiaomian, Guandu and Yunmen.

Tongchuan bridge

Hanyu Highway is the shortest route to transport Soviet aid anti-Japanese materials to Chongqing, which was then called "Chuanshan East Road". It is more than 90 kilometers shorter than Chuanshan Middle Road and 270 kilometers shorter than Chuanshan Road. Therefore, the Wuhan National Government ordered the construction in February 1938. It was opened to traffic on 194 1, which made great contributions to the material transportation in War of Resistance against Japanese Aggression. Because the new bridge was built on the original site. 1996 was bombed.

Climatic characteristics

Dazhou city belongs to subtropical humid monsoon climate type. Due to the complex terrain, the regional climate varies greatly. The low hills and valleys below 800 meters above sea level have mild climate, warm winter and early spring, hot summer and cool autumn, distinct seasons and long frost-free period; At an altitude of 800 to 1000 meters, the climate in the middle and low mountains is cool and humid, and it is hot in summer, cool in autumn and long and cold in winter. At an altitude of 1000 meters, Zhongshan District is short of light and heat resources, with a long cold period and outstanding spring cold and autumn frost. The city is rich in heat resources, with rain and heat at the same time. The annual average temperature is between 14.7 degrees and 17.6 degrees, and the frost-free period is about 300 days. The city is abundant in rainfall, with an average annual rainfall of 1076 to 1270 mm. There are many cold waves and low temperatures in spring, droughts and floods, strong winds and hail in summer and continuous rain in autumn.

Among the 2 158 plants recognized in the whole city, there are 1652 medicinal plants, and more than 500 species have been included in the standard. There are more than 30 varieties, which sell well in domestic and foreign markets. Radix Angelicae Dahuricae, Carthami Flos, Lily and Mume Fructus produced by Daxian; Huanglian, Dangshen, Malt and Magnolia Officinalis produced in Xuanhan; Cyperus rotundus and mountain plants produced in Kaijiang County; Wanyuan produces dried tangerine peel, codonopsis pilosula, Bupleurum, Eucommia ulmoides and Gastrodia elata. Radix Angelicae Dahuricae and Rhizoma Chuanxiong produced in Quxian are all bulk products. Among them, Gastrodia elata, Eucommia ulmoides, Cortex Phellodendri, Magnolia Officinalis and Polygonum Multiflori Radix are famous.