Photo taken on Sept. 11, 2017 shows a natural pasture at Guinan County in northwest China's Qinghai Province.Qinghai become more beautiful with the coming of autumn this year. (Xinhua/Wu Gang)

Photo taken on Oct. 3, 2017 shows populus euphraticas in the west of Golmud in northwest China's Qinghai Province. Qinghai become more beautiful with the coming of autumn this year. (Xinhua/Wang Bo)

Aerial photo taken on Sept. 27, 2017 shows quinoa fields at Wulan County in northwest China's Qinghai Province. Qinghai become more beautiful with the coming of autumn this year. (Xinhua/Wu Gang)

Photo taken on Oct. 3, 2017 shows populus euphraticas in the west of Golmud in northwest China's Qinghai Province. Qinghai become more beautiful with the coming of autumn this year. (Xinhua/Wang Bo)

Photo taken on Sept. 11, 2017 shows a natural pasture at Guinan County in northwest China's Qinghai Province. Qinghai become more beautiful with the coming of autumn this year. (Xinhua/Wu Gang)

Photo taken on Oct. 3, 2017 shows populus euphraticas in the west of Golmud in northwest China's Qinghai Province. Qinghai become more beautiful with the coming of autumn this year. (Xinhua/Wang Bo)

Aerial photo taken on Sept. 27, 2017 shows quinoa fields at Wulan County in northwest China's Qinghai Province. Qinghai become more beautiful with the coming of autumn this year. (Xinhua/Wu Gang)

Aerial photo taken on Sept. 27, 2017 shows quinoa fields at Wulan County in northwest China's Qinghai Province. Qinghai become more beautiful with the coming of autumn this year. (Xinhua/Wu Gang)

Photo taken on Oct. 1, 2017 shows one pasture at Qilian County in northwest China's Qinghai Province. Qinghai become more beautiful with the coming of autumn this year. (Xinhua/Wang Bo)