Abstract:

Landscape fragmentation changes the integrity of the regional landscape structure and the connectivity of the system， and has an important impact on the stability and sustainable development of the landscape. This paper selects Xinjiang Hotan Oasis as the research area， uses Xinjiang survey data and MSS images in 1970， and the four phases of Landsat TM /ETM+ data in 1990， 2000， 2013， and 2018 as the main data sources. The landscape index method， moving window method， Gradient analysis and attribution analysis methods to carry out research on the temporal and spatial pattern changes and driving factors of oasis landscape fragmentation， the landscape index method， moving window method， gradient analysis and attribution analysis were adopted Research on the temporal and spatial pattern changes and driving factors of oasis landscape fragmentation. The results show that in the past 50 years， the DIVISION index （DIVISION） has decreased from 0.94 to 0.89， and the Shannon diversity index （SHDI） has decreased from 1.44 to 1.28. The fragmentation of the oasis landscape has shown a slowing trend overall.， using landscape index method， moving window method， gradient analysis and Attribution analysis and other methods are used to study the temporal and spatial pattern changes and driving factors of oasis landscape fragmentation. The results show that in the past 50 years， the landscape fragmentation index has decreased from 0.94 to 0.89， and the Shannon diversity index has decreased from 1.44 to 1.28. The fragmentation of the oasis landscape has shown a slowing trend overall. Among them， the urban landscape has the lowest degree of fragmentation， showing a trend of first rising and then falling along the fragmentation gradient from the city center to the periphery. In addition， the degree of landscape fragmentation has an inverted U-shaped function relationship with the development of agriculture. When the agricultural expansion is 40%-50% of the oasis area， the degree of landscape fragmentation reaches its peak. Population growth， agricultural expansion， and socio-economic development jointly affect the temporal and spatial patterns of oasis fragmentation. This research not only provides a scientific basis for the analysis of the spatial change of the fragmentation pattern of the arid oasis landscape and the study of driving factors， but also has important significance for the planning and sustainable management of the oasis ecological landscape.

Key words: oasis, landscape fragmentation, moving window method, temporal and spatial changes, fragmentation index