Study of Land Use Intensity Change and Its Spatial Heterogeneity of Nyingchi City in Tibet

PurposeTo reveal the spatial heterogeneity characteristics of land use intensity of alpine gorge in Tibetan Plateau, providing a theoretical basis for local territorial spatial planning.

MethodBased on the Landsat satellite images in 2010 and 2020, the data of land use in 30 meters grid were obtained, and the spatial heterogeneity characteristics of land use intensity and its change in Nyingchi were analyzed by spatial autocorrelation analysis method.

ResultsThe grid units of stronger and strongest level of land use intensity were mainly distributed in the low altitude areas and the wide valleys of the Yarlung Tsangpo River and the Nyang River, the grid units of weakest and weaker level of land use intensity were mainly distributed in the high altitude area. From 2010 to 2020, the increased area of strongest level came from the reduced area of middle and stronger level of land use intensity. The land use intensity in Nyingchi had relatively strong positive global spatial autocorrelation with Moran’s Ⅰ, had obvious spatial aggregation law. The graph of local autocorrelation analysis showed that land use intensity low-low typology was in the northeast and northwest in Nyingchi, high-high typology was in the low altitude areas and the wide valleys of the Yarlung Tsangpo River and the Nyang River. The land use intensity change also had positive global spatial autocorrelation in Nyingchi from 2010 to 2020, high-high typology was in the wide valleys of the Nyang River, other densely inhabited districts and low altitude areas, but the low-high typology distributed around the high-high typology areas.

ConclusionThe land use intensity gradually strengthens, the land use intensity and its changes in Nyingchi is not disorderly, the regions with high land use change are adjacent to each other, and the regions with low land use change are adjacent to each other.