How far-reaching has the development of the south of the Yangtze River influenced the economic structure of China?

The development of the south of the Yangtze River provides a new land for the growing population to grow grain and some cash crops. The development of Jiangnan region has promoted the development of local society and strengthened the exchanges and communication between regions. The development of Jiangnan area has become a new source of national tax revenue. After continuous development, Jiangnan region has a good industrial base.

1. Jiangnan is a geographical area of China, and its scope, concept and definition are different under different circumstances in the fields of culture, geography and climate. Jiangnan in a broad sense refers to the south of the Yangtze River, generally referring to the south bank of the middle and lower reaches of the Yangtze River. Jiangnan is a place with outstanding people and beautiful scenery. "Jiangnan" has always been a constantly changing and flexible regional concept, but it always represents a beautiful and rich water town scene. It is also a developed region with superior natural conditions, abundant natural resources, developed commodity production and complete industrial chain, and it is the region with the highest comprehensive level in China. In different historical periods, the literary image of Jiangnan is different. Although Jiangnan first appeared in the pre-Qin and Han dynasties, it only refers to the south of rivers. After the Yongjia Rebellion in the Western Jin Dynasty, the gentry of the Central Plains crossed the Huaihe River and the Yangtze River to the south, and the garment crown crossed to the south, with Jiankang (now Nanjing) as the capital, which was used by the Eastern Jin Dynasty. Since then, from the Eastern Jin Dynasty to the appearance of "Viewing the Afterlife" and "Mourning for the South" in Nanliang, there has been Jiangnan culture. "Jiangnan" has always been a constantly changing and flexible regional concept. In a narrow sense, Jiangnan refers to Suzhou, Changzhou and Wuxi in southern Jiangsu, Huzhou, Hangzhou, Shaoxing, Ningbo, Jiaxing and Jinhua in Zhejiang, and parts of the Yangtze River Delta formed by Shanghai. The geographical scope of Jiangnan also includes Wuhu, Xuancheng, Huangshan, Maanshan, Chizhou, Tongling and Anqing in the southeast and south of Anhui. Jiujiang, Shangrao and Jingdezhen in the north and northeast of Jiangxi.

Second, the meaning of "Jiangnan" in ancient literature is varied. It is often an ambiguous word juxtaposed with regional concepts such as "Jiangbei" and "Central Plains". Historically, Jiangnan is not only a natural geographical area, but also a social and political area. Jiangnan includes the whole of Shanghai, Jiangxi and Zhejiang, as well as the areas south of the Yangtze River in Jiangsu, Anhui, Hubei and Shanghai. Compared with Jiangnan Road in Tang Dynasty, there are fewer parts involving Guizhou Province. Northern Fujian is sometimes called Jiangnan. In a broad sense, Jiangnan has a vast territory and diverse landforms, so it is often regarded as "Great Jiangnan", which is roughly consistent with the scope of Jiangnan in meteorology. Four rice markets and four famous buildings in Jiangnan are all within the scope of Jiangnan. This area includes three famous mountains, three rivers and three lakes-Qiantang River and Taihu Lake in Huangshan, Ganjiang River and Poyang Lake in Lushan, Xiangjiang River and Dongting Lake in Hengshan. These three rivers and lakes are the cradles of Wuyue culture, Ganpo culture and Huxiang culture respectively. The definition of "Great Jiangnan" begins with the ancient division (Jiangnan Road) and is often described in literary works. For example, Du Fu's Random Encounter Li Guinian was written in Changsha. The Jiangnan referred to in the weather forecast is roughly the Jiangnan zone in a broad sense. The word "Jiangnan" was still used in administrative divisions in the official geographical records at the beginning, but its division often could not represent Jiangnan, such as Jiangnan Road in Ming and Qing Dynasties. Wu Yueguo in the Five Dynasties and Ten Kingdoms, Liang Zhedao in the Song Dynasty and Jiangnan East Road in the Tang Dynasty are all good representatives of Jiangnan.

3. Compared with the north, the most obvious topographical features of the south of the Yangtze River are hills, plains and waters. Jiangnan is located in the hilly plain of the middle and lower reaches of the Yangtze River, with high terrain in the south and low terrain in the north. Its northern part is flat, mainly plains and hills, while some mountains are distributed in the south. In addition to abundant precipitation, there are two major water systems in the south of the Yangtze River and Qiantang River, which are connected by canals. There are many rivers and lakes in the south of the Yangtze River. There are three famous freshwater lakes in China, namely Poyang Lake in Jiangxi, Dongting Lake in Hunan and Taihu Lake in Jiangsu and Zhejiang. In the long-term development process, a large number of water conservancy projects have been built to connect them, such as Wu Zixu Kaixuxi, Fucha Ditch and Jiangnan Canal. Therefore, it has always enjoyed the reputation of "Water Town Zeguo".