(1) Due to the influence of summer monsoon (warm and humid airflow), the precipitation is less than in previous years; Evaporation is intensified with high temperature; The upstream reservoir impounds the river, and the runoff into the lake is reduced (or the inflow from the upper reaches of the Yangtze River is reduced).

(2) Rich in copper and hydropower (close to raw materials and energy). Destroy vegetation and aggravate soil erosion; Cause environmental pollution.

(3) Flood control and drought relief.

(4) agree. Reason: After the completion of the dam, it can increase the water quantity of Poyang Lake in dry season and reduce the flood threat in wet season in Poyang Lake area, which has comprehensive benefits such as water supply (irrigation), shipping, tourism and aquaculture. Disapprove. Reason: Damming the lake into the Yangtze River may affect the water safety in the lower reaches of the Yangtze River; It may affect the natural storage function of Poyang Lake and threaten the flood control safety in the middle and lower reaches of the Yangtze River. It may change the wetland environment of Poyang Lake and affect the survival of fish and birds.

(1) The water volume of Poyang Lake has been greatly reduced, and it is obviously "slimming". The reasons should be analyzed from the abnormal climate and water storage of the Three Gorges Reservoir in the upper reaches.

(2) The area is rich in resources and energy, which can develop non-ferrous metal smelting industry, but it may cause problems such as vegetation destruction and environmental pollution.

(3) Poyang Lake area is threatened by floods and droughts, and the main purpose of dam construction is flood control and drought resistance.

(4) The construction of Poyang Lake Dam will definitely have advantages and disadvantages. It can be analyzed from the aspects of regulating Yangtze River runoff, water supply, shipping, tourism and water storage. You can say that you agree or disagree, and the reasons are reasonable.