Shiyang River passes through the middle of Gansu, where irrigated agriculture is developed and the ecological environment problems are serious. According to the following materials, combined with the

Shiyang River passes through the middle of Gansu, where irrigated agriculture is developed and the ecological environment problems are serious. According to the following materials, combined with the knowledge learned. Done 1~4 (1) from southwest to northeast; Neliu River; Did not flow into the ocean

(2) a long time; Lake marsh; Humidity; Modern sand, ancient lakes and swamps.

(3) temperate continental climate; desertification

(4) Adjust the industrial structure, develop water-saving agriculture and ecological agriculture, develop sprinkler irrigation and drip irrigation to save water, restore the ecological environment of the basin, and return farmland to forests and grasslands.