A herdsman herds animals on Hequ Grassland in Henan County, Huangnan Tibetan Autonomous Prefecture, northwest China's Qinghai Province, Sept. 10, 2020. (Xinhua/Zhang Long)

A herdswoman prepares to milk cows on Hequ Grassland in Henan County, Huangnan Tibetan Autonomous Prefecture, northwest China's Qinghai Province, Sept. 10, 2020. (Xinhua/Zhang Long)

Aerial photo shows a view of Hequ Grassland in Henan County, Huangnan Tibetan Autonomous Prefecture, northwest China's Qinghai Province, Sept. 10, 2020. (Xinhua/Zhang Long)

Aerial photo shows a view of Hequ Grassland in Henan County, Huangnan Tibetan Autonomous Prefecture, northwest China's Qinghai Province, Sept. 10, 2020. (Xinhua/Zhang Long)

Photo shows herdsmen's tents on Hequ Grassland in Henan County, Huangnan Tibetan Autonomous Prefecture, northwest China's Qinghai Province, Sept. 10, 2020. (Xinhua/Zhang Long)

Aerial photo shows a view of Hequ Grassland in Henan County, Huangnan Tibetan Autonomous Prefecture, northwest China's Qinghai Province, Sept. 10, 2020. (Xinhua/Zhang Long)