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Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (4): 183-189.DOI: 10.7522/j.issn.1000-694X.2020.00045

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Lake number and area in the Tengger Desert during 1975-2015

Changzhen Yan1,2(), Sen Li1,2, Junfeng Lu1,2, Lichao Liu1   

  1. 1.Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
    2.National Earth System Science Data Center, Beijing 100020, China
  • Received:2020-01-03 Revised:2020-06-14 Online:2020-08-20 Published:2020-09-01

Abstract:

The lakes in the Tengger Desert are the result of long-term evolution of climate and environment. It is of great significance to monitor the spatial and temporal changes of the lakes for understanding the changing process of desert ecosystem and the sustainable development of oases in lake basins. In this study, the series of Landsat data from 1975 to 2015 and sentinel-2 data from 2018 were selected to derive the spatial and temporal data of lakes in the Tengger Desert through object oriented classification method and visual interpretation. The status quo, the characteristics of annual and inter-annual changes of lakes in the Tengger Desert and their influencing factors were also analyzed. The results showed that there were 240 lakes in the Tengger Desert with a total area of 2 652.2 hm2 in 2015. The number and area of lakes increased from 1975 to 1995. The relative variation rate of the number of lakes was between 2.5%-50.9%, and that of the area of the lakes was between 3.7%-75.9%. The changes of lakes in typical areas in southeast region was relatively flat during 2018, the area of the lakes reached their maximum in April and their minimum in July, and the relative variation rate of the monthly area was between 0.4%-21.8%. Temperature and vegetation growth were the main factors affecting the monthly variation of lakes.

Key words: Tengger Desert, remote sensing monitor, change of lake, affecting factor

CLC Number: