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Spatial-temporal differentiation and pattern optimization of landscape ecological security in the Ugan-Kuqa river oasis

The Ugan⁃Kuqa river oasis, a typical desert oasis area in the northwest arid area, is a vital guarantee for sustainable development of the oasis. In this study, three phases of Landsat TM images obtained in 1997, 2006, and 2016 were used as the main data sources to construct an ecological security evaluation model for the Ugan⁃Kuqa river oasis landscape, and spatial and temporal differentiation of the landscape ecological security in the last 20 years was analyzed.