Abstract:

The paper aims to study the land use change in the distribution area of wild fruit forests in Tianshan. Based on 8 periods of land use data from 1980 to 2020 in the Tianshan wild fruit forest distribution area, a land use geo-information mapping system with 7 time series was constructed to analyze the spatial and temporal characteristics of land use changes in the Tianshan wild fruit forest distribution area. The results showed that: (1) the land use structure of the Tianshan wild fruit forest distribution area was dominated by grassland and arable land, accounting for about 80% of the total area. (2) The mapping of land use change was dominated by the mutual transformation between forest land and grassland and the increase of cultivated land, while the overall change of other land types was small. (3) The net growth of grassland was the largest, followed by cropland; the shrinkage of forest land was the most serious, with a precipitous decline at the later stage. (4) The land use change pattern was mainly stable and unchanging, followed by late change type, and the smallest proportion of full-period change type; late land use changes were more frequent than the early period. (5) The frequency spectrum of land use change was dominated by stable and unchanging regions, followed by low-frequency regions, both of which accounted for more than 98%, so the overall land use structure was more stable. The study analyzed the characteristics of spatial and temporal evolution of land use in the distribution area of Tianshan wild fruit forest, revealed the land use change pattern in the study area, and provided basis for optimal scheduling of Tianshan wild fruit forest resources.

Key words: land use, geoinformation mapping, spatial and temporal variation, Tianshan wild fruit forest, remote sensing