Yangzhong geographical environment

Yangzhong City, Jiangsu Province is located in the middle of the Yangtze River on the east side of Lieshan Mountain in Dantu District, Zhenjiang City, with east longitude11942 ′ ~1958 ′ and north latitude 32 ~ 3219 ′. It consists of four sandbars, Leigongzui, Taipingzhou, Xisha and Zhongxinsha, on the south side of the main channel of the Yangtze River, and is a part of the alluvial plain of the Yangtze River Delta. The city runs from northwest to southeast, about 40 kilometers long from north to south and 7 kilometers wide from east to west on average. The northeast faces Taixing City, Jiangdu District of Yangzhou City and Hanjiang District of Yangzhou City across the great river, and the southwest faces Dantu District, Danyang City and Wujin District of Changzhou City across the Jiajiang River. The total area of the whole territory is 33 1 square kilometer, the water area is 88 square kilometers, and the land area is 243 square kilometers, including cultivated land 166600 mu.

Yangzhong is a city composed of Taiping Island, Zhongxinsha, Leigong Island and Xisha Island. Yangzhong Island is the largest Jiang Xinzhou and the second largest island in the Yangtze River, located in the Yangtze River east of Nanjing. Leigongzui Island is located at the northern end of Yangzhong, a beautiful island city in Jiangsu Province. Xisha Island, also known as "Xiaopaosha", is one of the four islands in Yangzhong City, located between Yangzhong Island and Zhenjiang New District in the middle and lower reaches of the Yangtze River, and belongs to Yangzhong City and Zhenjiang New District. Xilaiqiao Island is the second largest island in Yangzhong City, and the town is located near east longitude 1 19 5' and north latitude 32 06'. The average annual temperature on the island is 15℃, and the average annual rainfall is1066.2mm, with four distinct seasons. Yangzhong City is located in the central climate zone of the north subtropical monsoon, with abundant rainfall, abundant sunshine, mild climate and long frost-free period. Characteristics of rain and heat in the same season. Excellent climatic conditions are suitable for the growth of warm crops such as rice, cotton and hemp. It is beneficial to the safe overwintering of cold-resistant crops such as wheat and rape; Many vegetables and other cold-resistant cash crops can grow normally in different seasons. Due to the unique natural environment surrounded by rivers in Yangzhong, compared with neighboring counties at the same latitude, it has the characteristics of warming up in spring, slightly cooling down in autumn, fewer high-temperature days in summer and more heavy rains in Meiyu period.

The winter in Yangzhong is controlled by the northwest wind (winter wind) blowing from the northern mainland, and the northwest monsoon prevails from 165438+ 10 to 65438+ 10 in the following year. The frequency of northwest wind in June+10/October in 5438 was 9%; In summer, influenced by the southeast wind from the ocean, the weather is hot and rainy. Southeasterly winds prevail from April to August, and the frequencies of southeasterly winds in June, July and August are 17%, 17% and 18% respectively. In spring, it is sunny and rainy, and the weather is changeable; Autumn is often sunny and rainy for a long time, but after a few years, there are also long rainy days.

According to the meteorological data from1959 to 2000, the average annual temperature in Yangzhong is 15. 1℃, with the highest year reaching 16℃ and the lowest year being 14.3℃. The average temperature is below 12℃ for five months, including 1, February, March,1,12℃, but not in months above 28℃. The average annual precipitation in Yangzhong is about 1 1,000 mm, and the annual precipitation days are 1 16.3 days, accounting for 1/3 of the total days of the year. Because it is surrounded by water, the air humidity is relatively high, reaching about 80 in spring and autumn. The annual sunshine duration is 2 135 hours. Yangzhong city is a sandbar in the middle of the river and belongs to alluvial plain. Yangzhong city has no hills and low terrain. The altitude is 4 ~ 4.5 meters, and the relative height is about 1 meter. The whole territory is slightly inclined from northwest to southeast.

The bedrock of each sandbar in Yangzhong city is an integral part of the ancient land of the Yangtze River, and the upper layer is the alluvial layer of the Yangtze River with fine surface material. The middle part is a sandbar core, and the periphery of the core is a bristle mountain composed of rough materials. They are all Yangtze River sediments, belonging to Cenozoic, Quaternary and Holocene modern sediments (secondary loess) lithology, yellow and brownish yellow sandy clay. Since Quaternary, neotectonic movement has been active, and external forces such as Yangtze River current have played a leading role in the formation of Yangzhong prototype.