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Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (6): 131-141.DOI: 10.7522/j.issn.1000-694X.2023.00053

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The change of oasis structure / scale and its influencing factors in Zhangye Basin in recent 20 years

Tiaoxue Lu1,2(), Linshan Yang1(), Qi Feng1, Meng Zhu1, Naiyu Li1,3   

  1. 1.Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.University of Chinese Academy of Sciences,Beijing 100049,China
    3.Gansu Agricultural University,Lanzhou 730070,China
  • Received:2023-02-03 Revised:2023-05-10 Online:2023-11-20 Published:2023-11-30
  • Contact: Linshan Yang

Abstract:

In order to clarify the characteristics and driving factors of oasisization in inland river basin, this paper took the oasis in the Zhangye Basin of Heihe River Basin as the research object, obtained the continuous oasis scale data in the Zhangye Basin from 2000 to 2020 based on land use and NDVI data inversion, and analyzed the law of change of oasis scale and internal structure in the Zhangye Basin. The key factors affecting oasis change were clarified based on the data of economic, cultural and hydrological resources in the basin in the past 20 years. The results show that the oasis scale in the Zhangye Basin has expanded by 485.78 km2 in the recent 20 years, showing a trend of the desert to oasis transformation on the whole. In oasis, the proportion of cultivated land and unused land was the largest, and the cultivated land area increased the most in the past 20 years, increasing 19.00% compared with 2000, while the forest land area decreased 25.38% compared with 2000. The changes of oasis scale and internal structure are influenced by natural factors and human activities. Economic development and population play a direct role in oasis scale expansion, and irrigation water consumption plays a decisive role in oasis scale expansion. The results can provide a basis for the rational development of soil and water resources in the inland river basin and the future layout of the oasis structure.

Key words: Zhangye Basin, oasis scale, oasis structure, driving factors

CLC Number: