The Analysis of Land Use Change in Ganan Prefecture from 1990-2022
Analyzing land use changes can provide theoretical basis for the planning,management,protection,and utilization of national land space.Based on the land use of data from 1990,2000,2010,and 2022,the article clarifies the land use structure,the land use changes and the transfer of land use types in Gannan Prefecture by calculating the dynamic degree of land use,land use degree index,and land use transfer matrix.The results show that the land use types in Gannan are mainly grassland,followed by forest land,accounting for 94.84％of the total area of Gannan;From 1990 to 2022,the forest land,water area,snow/ice,wasteland,and impermeable water surface showed an overall increasing trend,with an increase of 103 226.67 m2,3 555.72 m2,254.61 m2,2 646.18 m2,and 353.97 m2;The overall trend of farmland,shrubs,grasslands,and wetlands is decreasing,with a decrease of 22 309.47 m2,34 404.66 m2,and 46 829.34 m2.The comprehensive dynamic degree of land use in Gannan Prefecture from 1990 to 2022 was 0.60％,and the maximum comprehensive dynamic degree of land use was 0.32％from 1990 to 2000.The degree of land use in Gannan Prefecture from 1990 to 2022 was 202.981 2,203.078 3,202.924 5,and 202.317 8,respectively,with a trend of"increase-decrease-decrease"in land use level.From 1990 to 2022,the largest area of forest land was transferred,with an area of 124 098.30 m2;The grassland has the highest turnover,with an area of 139 700.61 m2;The net transfer in of forest land is the highest,with an area of 103 226.67 m2,and the net transfer out of grassland is the highest,with an area of 4 682.34 m2.
land useGannan Prefecturetransfer matrixland use degreedynamic degree
NETL
NSTL
万方数据
