Cai surname distribution

The population of contemporary Cai surname has reached 5.52 million, which is the 44th surname in China, accounting for 0.46% of the national population. In the 600 years since the Ming Dynasty, the population of Cai increased from 460,000 to 5.52 million, reaching 12 times. The average population of the Ming Dynasty was close to 93 million, and the contemporary population was 65.438+0.2 billion, an increase of 654.38+0.3 times. Cai's population growth rate is slightly lower than that of the whole country. In the past 1000 years, the population growth rate of Cai showed a downward trend. The distribution in China is mainly concentrated in Guangdong, Zhejiang and Jiangsu provinces, accounting for about 35% of Cai's total population; Secondly, it is distributed in Sichuan, Hubei, Taiwan Province, Anhui and Fujian, with a concentration of 32% in these five provinces. Guangdong is 13.7% of the total population of Cai, and it is the largest province in Cai, accounting for 1% of the total population of the whole province. The whole country has formed a region with a high proportion of Cai surnames in the southeast coastal areas. In the past 600 years, the degree and direction of Cai's population movement are somewhat different from those in the Song, Yuan and Ming Dynasties. Although there are cases of emigration to Central China and North China, it is still the mainstream to emigrate to the southeast, and some to the west and northeast.

The areas with the highest population density per unit area of Cai surname are in the southeast coast, the Yangtze River basin and most of the northeast. The population of Cai surname per square kilometer reaches 1 or above, and some areas reach more than 3. Followed by central Guangdong, northern Hunan and Guizhou, eastern Yunnan, western Sichuan, most of Gansu, Ningxia and Qinghai, southwestern Henan, southeastern Shandong, eastern Inner Mongolia, and the border areas of Hebei and Liaoning, the population of Cai per square kilometer reached 0.5- 1. The schematic diagram of the distribution density of Cai surname shows that the area with the highest density (1 person/square kilometer) accounts for 19.2% of the land area, and the population of Cai surname is about 2.7 million; The area of 0.5- 1 person /km2 accounts for 27. 1% of the national territory, and the population of Cai is about 1.96 million. The area with less than 0.5 people per square kilometer accounts for 53.7% of the national territory, and the population of Cai is about 860,000.

Cai surname is widely distributed, but it is not balanced. The schematic diagram of the distribution frequency of Cai surname in the crowd shows that Cai surname is one of the more common surnames in the southeast coastal areas. Cai's surname is in Taiwan Province Province, Fujian, southern Zhejiang, the eastern end of Guangdong and the northeast corner of Inner Mongolia, which generally accounts for the highest proportion of the local population, above 0.9%, especially in southern Taiwan Province Province, and some of them reach 3%. This high proportion of areas accounts for about 3.7% of the country's total area. In central Guangdong, eastern Jiangxi, northern Zhejiang, southern Jiangsu, southeastern Anhui, southwestern Guangxi, Hainan, eastern Yunnan, Shaanxi-Sichuan border area, Hexi Corridor and central Jilin, the frequency of Cai's surname is 0.45%-0.9%, covering an area of about 13% of the country's total area. In other vast areas, the frequency of Cai surname is less than 0.45%, and its coverage area accounts for about 83.3% of the country's total area, of which the frequency below 0.25% accounts for 50% of the country's land area.