Ecological damage to fruit forests: The local Duoji fruit forests have suffered a certain degree of damage, and their vegetation structure may become monotonous and unable to provide rich habitats and food resources for birds. For example, the number of trees in orchards is reduced and the hierarchical structure is unclear, resulting in limited nesting space for birds, making it difficult for birds with different habits to find suitable habitats.

Aquatic ecological damage: The aquatic ecosystem inside the river is damaged, such as water pollution, water area reduction, etc. Deterioration of water quality will affect the survival of aquatic life, thereby reducing the food source of birds that feed on aquatic life; the reduction of water area directly compresses the activity space and foraging range of birds.

Single plant species: The plant species on the site are not rich enough to provide diverse food for birds. In addition to fruits, birds also need food sources such as insects and nectar. If the plant community structure is simple, the number of insects will decrease accordingly, making it difficult to meet the food needs of birds.

Impact of seasonal changes: The fruiting period of some plants is seasonal, and during the non-fruiting period, there will be a shortage of food resources for birds. If there are no alternative food sources, birds may leave the area in search of more plentiful food.

Water quality pollution: Surrounding industrial wastewater discharge, domestic sewage inflow, etc. may cause the water quality of the wetland to decline, affecting the survival and reproduction of aquatic life, and thus affecting the birds that feed on it. For example, pollutants in the water may reduce the number of fish, shellfish, etc., leaving birds with less food sources.

Air pollution: Industrial waste gas, vehicle exhaust and other pollutants in cities may affect the quality of the air, cause damage to the respiratory systems of birds, and reduce their survival and breeding success rates. In addition, air pollution may also affect plant growth and insect activity, indirectly affecting the food resources of birds.

Overdevelopment: During the urban development process, the area may have experienced excessive development and construction, such as building buildings, roads, etc., resulting in the fragmentation of bird habitats. The activity range of birds is restricted, making it difficult for them to move freely between different habitats and forage.

Interference from tourism activities: As a wetland park in the city, there are a large number of tourists. Tourists' loud noises and frequent movements may frighten the birds, making them unable to rest and forage in peace. Especially during the breeding season of birds, such disturbance may cause birds to abandon nesting or brood raising.

Blocked water system connectivity: Poor connectivity between water systems in wetlands affects the migration and reproduction of fish and other aquatic organisms, which in turn affects the food supply of birds that feed on them. At the same time, it is not conducive to the migration and habitat of birds between different waters.

Ecological isolation between land and water: There is a lack of good transition and connection between the Duoji fruit forest and the aquatic ecology inside the flush, which restricts the foraging and habitat of birds between land and water, and makes it impossible to fully utilize the resources of the two ecological environments. .

Poor nesting conditions: The site lacks suitable materials and places for birds to nest, such as tall trees, dense grass, etc. Without a safe and sheltered nesting environment, it is difficult for birds to reproduce.

Interference during the breeding period: During the breeding period of birds, factors such as interference from human activities and an increase in the number of natural enemies may lead to a reduction in the breeding success rate of birds, thereby affecting the growth of bird populations.