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Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (2): 231-241.DOI: 10.7522/j.issn.1000-694X.2020.00138

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Response of oasis area to the surface runoff in Hexi inland river basin of China

Shengxia Wang1(), Fei Wang2   

  1. 1.CAS Key Laboratory of Ecohydrology of Inland River Basin / State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.Lanzhou University of Finance and Economics,Lanzhou 730101,China
  • Received:2020-11-17 Revised:2021-02-28 Online:2021-03-20 Published:2021-03-26

Abstract:

This paper calculated NDVI in Hexi inland river basin by using NASA AVHRR NDVI3g data, and took the region where NDVI value is larger than 0.20 in growing period as oasis, and calculated variation coefficient and linear slope of oasis NDVI to analyze characteristics of oasis dynamic change in1982-2013 and its response to surface runoff. The results showed that oasis in the study area expanded in recent 30 years, and expansion regions were mainly concentrated in oasis fringe area, both sides and terminal of river; the fragmentation of small patch oasis increased and contiguous oasis core area was relatively stable; the contribution rate of precipitation in mountain area to oasis changes was nearly half of the surface runoff, the contribution rate of glacier melt water to oases changes increased from east to west, and the contribution rate of precipitation in oasis region decreased from east to west. The results will provide scientific understanding for analyzing the impact of glacier melt water resources on social economy in Hexi inland river basin.

Key words: Hexi inland river, oasis dynamic change, mountain runoff, oasis precipitation, response

CLC Number: