The changes in the ecological environment caused by human activities in Xinjiang are mainly as follows:1. The flowing distances of rivers have been shortening, and the mineralization and silt content of their water have been increasing.2. The water level of lakes has been descending, or they have been drying up, their water mineralization has been rising.3. Forests have been being damaged, the area has been reducing.4. Pastures have been retrograding, the herbage yield has been dropping, and the quality det...