Analysis of Temporal and Spatial Dynamics of Forests From 2003 to 2018

This paper takes The Sejila Mountain area in Nyingchi City, Tibet province as the research object, studies and analyzes the land use/cover change and its driving factors in the past 15 years, and provides a technical basis for the rational use of sejila mountain land and for the land management department to formulate management policies and implement various management measures. Using landsat5-TM and Landsat8-oli remote sensing satellite images as data sources, spatial analysis method of transfer matrix and dynamic attitude of land use were used to analyze spatial-temporal dynamic changes of land in ArcGIS. At the same time, the driving force of woodland change was analyzed in combination with woodland change investigation in this area. In the past 15 years, the area of the Forest area of Sejila showed a trend of “increasing - decreasing - increasing”, but the overall phenomenon of area decreasing was shown. In space, there is a decrease from southeast to northwest. The main driving force of the change of forest land is the construction of industrial and commercial land and reclamation into farmland From 2003 to 2018, the land/cover change of Sierra Mountain was obvious, among which climate, population and urbanization level were the main driving factors of land/cover change of Segila.