Summarize the negative effects of population changes in the early Qing Dynasty.

The population growth in the early Qing Dynasty had a great and far-reaching impact on all aspects of China society.

First of all, the expansion of population has aggravated the tension between man and land and contributed to the intensification of class contradictions. This is a very important related factor that triggered the Anbaili Uprising in Qing Dynasty and the Taiping Heavenly Kingdom Movement.

Secondly, population expansion has aggravated ethnic contradictions. The rapid increase in population has caused many Han people to flood into ethnic minority areas and compete with them for living space, thus triggering ethnic conflicts.

Third, the expansion of population has led to the change of tenancy relationship. From "escaping from tenancy" in Song Dynasty to "dominating tenancy" in Qing Dynasty, it reflects the historical process of the contradiction between population growth and land shortage. The Song Dynasty "enriched the people, recruited tenants, and lent them at the end of the harvest every year.

Fourth, the population expansion led to the long wave of immigration since the middle of Qing Dynasty. In the past, the migration tide was mainly caused by war, such as the southward crossing in Yongjia, the southward migration of northerners after the Anshi Rebellion and the migration after the Jingkang Rebellion. The migration in Qing dynasty was caused by the pressure of population growth, so the floating population became a social norm at this time.

Fifth, population expansion leads to the increase of unemployed refugees and the prosperity of gang organizations. With the increase of population and surplus labor force, many people have been driven out of their homeland and become refugees. The difference between these refugees and those who fled their homes because of war and famine in the past is that the latter can return to the land to rebuild their homes after the war has subsided and the famine years have passed, while the former is homeless even when the weather is good.