Aerial photo taken on June 27, 2020 shows a shelter forest along the Yarlung Zangbo River in Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Zhang Jingpin)

Aerial photo taken on June 27, 2020 shows a shelter forest along the Yarlung Zangbo River in Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorje)

Aerial photo taken on June 27, 2020 shows a shelter forest along the Yarlung Zangbo River in Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Wang Zehao)

Aerial photo taken on June 27, 2020 shows a shelter forest along the Yarlung Zangbo River in Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorje)