A city without trees

The city without trees is Nagqu.

There are no trees growing in Nagqu Town. The average altitude here is 4,500 meters, with strong winds, thin soil, low temperatures, strong ultraviolet rays, and perennial frozen soil. The Forestry Bureau of Nagqu has tried to plant trees, officers and soldiers of the military division have tried to plant trees, and the scientific research team has also tried to plant trees in Nagqu in the form of projects. The places with trees in Naqu are mainly concentrated in a test base, covering an area of ??2 acres.

It was established in 1998 by Nagqu forestry technicians in the courtyard of the regional Agriculture and Animal Husbandry Bureau. Forestry personnel first introduced saplings from the Ali area and tried planting alpine willow, water cypress branches, sea buckthorn, Ali Bangong willow, etc., but with little success.

In 2007, Nagqu forestry technicians introduced 20 spruce trees, 10 Beijing poplar trees from Lhasa, and 30 alpine willow trees from Suo County, and tried planting them in the urban area. Later, 14 alpine willow, spruce and other trees survived, and 1 Beijing poplar tree survived. "These 14 trees are the oldest trees in Nagqu City." said Kelsang Quzhen, deputy director and senior engineer of the Tibet Autonomous Region Forestry Science Research Institute.

There are also some scattered trees growing in leeward, sunny and warm places. Due to the lack of scientific research support, although some trees survived, large-scale promotion and planting in the later period were not successful. Nagqu is known as the only town in the country where trees do not grow.

Climate:

Nagqu City belongs to the subarctic climate zone, with a high altitude and insufficient heat. The climate is cold and arid, and its oxygen content is only half of that at sea level. The Northern Tibetan Plateau is one of the areas with the harshest climate conditions in Tibet and is a typical subarctic climate area.

Alpine and hypoxic, the climate is dry, the temperature difference between day and night is large, and the weather is very windy. The annual average temperature is -0.9℃ to -3.3℃, ??the annual relative humidity is 48-51%, and the average annual rainfall is only 100 -200 mm, the annual sunshine hours are 2852.6-2881.7 hours, the climate is dry and cold all year round, and there is no absolute frost-free period.

Every year from November to March of the following year, it is the dry and windy period in northern Tibet. Once it snows, it is easy to become a snow disaster. During this period, the climate is dry, the temperature is low, there is anoxia, and the wind and sand are heavy, and the duration is long. long. The period from May to September is relatively warm, which is the golden season of the grassland. The climate is mild, the wind is beautiful, and the rainfall accounts for 80% of the year. The green plant growth period lasts about a hundred days throughout the year, all concentrated in this season.

Reference for the above content: Baidu Encyclopedia-Nakqu City