The reason why Hu Guang filled in Sichuan.

Hu Guang's reasons for filling Sichuan are as follows:

1. War damage: In the late Ming Dynasty, Sichuan experienced war damage and its population dropped sharply. In order to restore local agricultural production and stabilize social order, it is necessary to move people from other areas to Sichuan.

2. Natural disasters: Sichuan is often attacked by natural disasters such as earthquakes and floods, resulting in a large number of deaths or displacements of the local population. In order to rebuild their homes and resume production, people from other areas need to be moved to Sichuan.

3. Barren land: Due to wars and natural disasters, the land is barren and a lot of land is idle. In order to use these lands and resume agricultural production, people must move from other areas to Sichuan.

4. Policy orientation: The Ming government implemented the policy of "opening up borders for immigrants" to encourage immigrants to develop land and rebuild their homes in Sichuan. In addition, the policy of "Huguang filling Sichuan" in the early Qing Dynasty was also aimed at restoring population and social stability and promoting economic development in Sichuan.

5. Through the migration of immigrants and population, the agricultural production and social order in Sichuan have been effectively rebuilt, and the economic development and cultural exchange have been promoted.

The influence of Hu Guang filling in Sichuan:

1. Positive impact: More than 300 years ago, "Huguang filling Sichuan" brought different regional cultures and lifestyles to Sichuan and injected fresh blood into Sichuan. Even Sichuan's unparalleled appeal and assimilation come from the rich immigrant culture, and these immigrants from other provinces have become the ancestors of most Sichuanese.

Second, the negative impact:

1. Destruction of resources: After immigrants entered Sichuan, the agricultural reclamation in Sichuan gradually moved from the initial reclamation of plain wasteland to the middle of hilly and mountainous areas, and the reclamation scope further reached the top of the mountain and the upper part of the semi-mountainous areas. At that time, mountainous areas prevailed, terraces appeared, and soil erosion was serious. The total area of cultivated land is millions of hectares, and the forest vegetation is seriously damaged.

2. Species disappearance: during the first year of Qianlong, the cultivated land area was expanded from immigrant development to mountainous areas and hills, which was a sign that farmland reclamation broke through the traditional scope, but it was also the beginning of the gradual decline of the ecological environment. In terms of forest species resources, some animal communities are decreasing, and the number of organisms and even species is disappearing.

3. Frequent droughts: Since emigration, geological and geomorphological disasters, droughts and floods have occurred more frequently in Sichuan. From16th century to17th century, drought disasters occurred most frequently in the whole Ming and Qing dynasties, especially in the eastern part of the basin in17th century.