People take part in a ceremony marking the start of spring ploughing in Shannan, southwest China`s Tibet Autonomous Region, March 16, 2021. (Xinhua/Jigme Dorje)

Aerial photo shows people taking part in a ceremony marking the start of spring ploughing in Shannan, southwest China`s Tibet Autonomous Region, March 16, 2021. (Xinhua/Jigme Dorje)

A man takes part in a ceremony marking the start of spring ploughing in Shannan, southwest China`s Tibet Autonomous Region, March 16, 2021. (Xinhua/Jigme Dorje)

People take part in a ceremony marking the start of spring ploughing in Shannan, southwest China`s Tibet Autonomous Region, March 16, 2021. (Xinhua/Jigme Dorje)

A woman sows highland barley seeds as she takes part in a ceremony marking the start of spring ploughing in Shannan, southwest China`s Tibet Autonomous Region, March 16, 2021. (Xinhua/Jigme Dorje)

People take part in a ceremony marking the start of spring ploughing in Shannan, southwest China`s Tibet Autonomous Region, March 16, 2021. (Xinhua/Jigme Dorje)

Women sow highland barley seeds as they take part in a ceremony marking the start of spring ploughing in Shannan, southwest China`s Tibet Autonomous Region, March 16, 2021. (Xinhua/Purbu Zhaxi)

People take part in a ceremony marking the start of spring ploughing in Shannan, southwest China`s Tibet Autonomous Region, March 16, 2021. (Xinhua/Jigme Dorje)

Aerial photo shows people taking part in a ceremony marking the start of spring ploughing in Shannan, southwest China`s Tibet Autonomous Region, March 16, 2021. (Xinhua/Jigme Dorje)

People take part in a ceremony marking the start of spring ploughing in Shannan, southwest China`s Tibet Autonomous Region, March 16, 2021. (Xinhua/Jigme Dorje)

People take part in a ceremony marking the start of spring ploughing in Shannan, southwest China`s Tibet Autonomous Region, March 16, 2021. (Xinhua/Jigme Dorje)

A tractor driver takes part in a ceremony marking the start of spring ploughing in Lhasa, southwest China`s Tibet Autonomous Region, March 16, 2021. (Xinhua/Chogo)

A little girl takes part in a ceremony marking the start of spring ploughing in southwest China`s Tibet Autonomous Region, March 16, 2021. (Xinhua/Chogo)

People take part in a ceremony marking the start of spring ploughing in Lhasa, southwest China`s Tibet Autonomous Region, March 16, 2021. (Xinhua/Chogo)