Figure 4. Spatial distribution map of land use and land cover (LULC) in Jiuyuangou watershed in 2010, 2015, and 2020.
Table 3 shows that grassland increased from 3613.33 ha in 2010 to 4349.05 hm2 in 2020, and forest land decreased from 2191.53 ha in 2010 to 1985.54 ha in 2020. Forest and grass cover in 2020 increased by 10% compared to 2010. Land use types changed from 2010 to 2020 in the Jiuyuangou watershed: 877.04 ha converted from cropland and construction land to forest land and grassland, 447.48 ha converted from forest and grassland to cropland and construction land, and 3542.24 ha of forest and grassland area remained unchanged. Forest and grass coverage areas in the basin increased, with remarkable results from regional environmental governance and the project of returning farmland to forest.
Table 3. Transfer matrix of LULC area in Jiuyuangou from 2010 to 2020(ha).