Aerial photo taken on Oct. 14, 2020 shows the autumn scenery of Shiyang River national wetland park in Wuwei, northwest China's Gansu Province. (Photo by Jiang Aiping/Xinhua)

Aerial photo taken on Oct. 14, 2020 shows the autumn scenery of Shiyang River national wetland park in Wuwei, northwest China's Gansu Province. (Photo by Jiang Aiping/Xinhua)

Aerial photo taken on Oct. 14, 2020 shows the autumn scenery of Shiyang River national wetland park in Wuwei, northwest China's Gansu Province. (Photo by Jiang Aiping/Xinhua)

Photo taken on Oct. 14, 2020 shows the populus euphratica forest at the Shiyang River national wetland park in Wuwei, northwest China's Gansu Province. (Xinhua/Guo Gang)

Photo taken on Oct. 14, 2020 shows the populus euphratica forest at the Shiyang River national wetland park in Wuwei, northwest China's Gansu Province. (Xinhua/Guo Gang)