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Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (3): 44-55.DOI: 10.7522/j.issn.1000-694X.2021.00014

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The aeolian desertification process and driving mechanism of Minqin Oasis from 1975 to 2018

Junhao Li1,3(), Yong Chen2, Guojing Yang1, Lihua Zhou4()   

  1. 1.Key Laboratory of Ecohydrology of Inland River Basin, Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    3.University of Chinese Academy of Sciences,Beijing 100049,China
    4.Institutes of Science and Development,Chinese Academy of Sciences,Beijing 100190,China
  • Received:2020-12-30 Revised:2021-01-23 Online:2021-05-26 Published:2021-05-26
  • Contact: Lihua Zhou

Abstract:

Based on the land aeolian desertification data and remote sensing image data of Minqin Oasis from 1975 to 2018, the temporal and spatial changes of Minqin Oasis aeolian desertification in different periods are explored; By selecting the natural and man-made driving factors that affect the aeolian desertification change of the oasis, the principal component analysis method is used to quantitatively evaluate the main driving forces of the aeolian desertification process of the Minqin oasis. The result shows: The degree of aeolian desertification from 1975 to 2018 is dominated by aeolian severe desertification, and the areas of slight, moderate, severe and extremely severe aeolian desertification all show a decreasing trend, and the trend of first development and then reversal is shown in 2000 as the boundary; From 1975 to 2000, the center of gravity of slight, moderate and severe aeolian desertification migrated to the northeast, and the center of gravity of extremely severe aeolian desertification migrated to the west. Desertification tended to develop toward the northeastern oasis and the Badain Jaran Desert; from 2000 to 2018, the center of gravity of slight aeolian desertification moved to the northwest. The center of gravity of moderate, severe and extremely severe aeolian desertification land is relatively stable, and the development of oasis aeolian desertification land is obviously controlled. In the process of oasis aeolian desertification, the contribution rate of human factors is 39.53%, the combined contribution rate of natural and human factors is 26.58%, and the contribution rate of natural factors is 10.77%. Human factors are the main driving force for the desertification of Minqin Oasis. The extreme scarcity of water resources is a decisive factor in the aeolian desertification of oasis. In the future sand prevention and control work, combining human driving factors, rationally regulating human production and operation activities, and optimizing the allocation of water resources in arid areas, the aeolian desertification of Minqin Oasis can be controlled from the source.

Key words: Minqin Oasis, aeolian desertification, aeolian desertification process, driving force

CLC Number: