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| 2021-08-11 10:00:51 | onclick： | Ecological protection helps the restoration of Mingsha mountain in Dunhuang |
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Qu Jianjun, a national model of desertification prevention and control and researcher of Dunhuang Gobi Desert Research Station of Northwest Institute of ecological environment and resources, Chinese Academy of Sciences, based on the continuous investigation of Mingsha mountain and Mingsha phenomenon in Dunhuang City, Gansu Province, recently successfully found that there are Mingsha groups distributed in Mingsha mountain area, and some sand mountains have resumed "singing".
Qu Jianjun introduced that Mingsha starts from Mogao Grottoes in Shandong to danghekou in the west, stretching about 40 kilometers from east to west and about 20 kilometers from north to south“ The sand here can sing? " In this regard, he explained that Mingsha, also known as loud sand, whistle sand or music sand, is often distributed in deserts and beaches, and the desert is the most rare. It is considered to be a magical natural phenomenon, and therefore has become an important tourism resource. However, the famous Mingsha mountain in China, including Mingsha mountain in Dunhuang City, Gansu Province, has successively lost its vocal function.
After years of research, Qu Jianjun found that the porous (PIT) structure formed by wind erosion, water erosion and other factors on the surface of natural sand particles in Mingsha mountain, Dunhuang City constitutes a resonant cavity. With the help of external forces, they rub and collide with each other during movement, resulting in extremely weak vibration sound, which is amplified by a large number of surface cavities, Thus, the human ear can receive the sound spectrum of moving sand particles. However, with the increase of environmental pollution and human activities, the sand grains in Mingsha mountain in Dunhuang are worn, and then dust and other impurities are produced. When these impurities invade the holes on the surface of sand particles, due to their damping effect, the resonance mechanism of singing sand is lost and becomes "dumb sand". His research achievement won the second prize in the sand industry competition of the Eighth China Innovation and entrepreneurship competition in 2019.
Qu Jianjun told reporters that around the 1990s, due to the increase of human activities and excessive human stepping and sliding, it brought difficulties to the ecological protection of Mingsha mountain, and some Mingsha also gradually lost their vocal mechanism. In recent years, the local government has launched the closure and protection project of Mingsha mountain, delimited the desertification closure and restricted area, and carried out closure and protection and vegetation conservation projects, which has helped restore the "singing" of some sand mountains of Mingsha mountain in Dunhuang to a certain extent, and formed a rare Mingsha group.
"After years of scientific protection, some sand grains of Mingsha mountain in Dunhuang have been washed, and the surface of sand grains has been purified. After stepping on and pressing, sand grains can restore their previous' chirp '." Qu Jianjun suggested that the scientific investigation of Mingsha resources should be carried out as soon as possible. Through the investigation and evaluation of Dunhuang Mingsha resources, the Mingsha dunes should be accurately located to protect this magical natural phenomenon, so as to provide a scientific basis for the protection, rational development and utilization of Dunhuang Mingsha tourism resources.
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