Why is the population density high in southeastern China?

43.8% of the land in the southeast of Hu Huanyong Line is inhabited by 94. 1% of the population.

1935, China geographer Hu Huanyong drew a demarcation line of population density in China-internationally called "Hu Huanyong Line". This line starts from Aihui, Heilongjiang Province (now Heihe City) in the north and extends all the way to the southwest until Tengchong, Yunnan Province. A line inclined at approximately 45 degrees.

96% of the population lives in 36% of the land in the southeast, while the northwest is close to 64% of the land area of China with only 4% of the population. This is a golden line with the clearest population density in China. One line divides the population density of China into two areas, one is bustling and lively. The other end of the dividing line is sparsely populated and lifeless.

The construction corps reclaimed land and defended the frontier.

1, with the rapid development of China's economy, the national policy has undergone earth-shaking changes in the following 80 years. Indeed, a lot of earth-shaking things have happened: the construction corps has settled down and defended the border, developed and opened up to support the northwest, the third-line construction, and the educated youth went to the countryside ... The two ends of the golden section have also undergone obvious changes.

2. 5.6 1% of the population lives in 57% of the land area in the northwest of Hu Huanyong Line, and about 94.39% of the population lives in 43% of the land area in the southeast of Hu Huanyong Line. With the continuous development of national economy, the area contrast on the golden section tends to be reasonable, and the area ratio is 43% to 57%.