Study on Land Use Change in Daliangshan Area Based on Transfer Matrix

In this paper, the land use/cover maps of Daliangshan in 1990, 2000, 2010 and 2022 are obtained by remote sensing interpretation, and the dynamic changes of land use in Daliangshan are analyzed by using the method of transfer matrix. the impact of policy change on land use is also discussed. The results show that from 1990 to 2022, the area of cultivated land in Daliangshan area decreased from 11153 km² to 4090 km² , by 63%; the area of woodland increased from 11713 km² to 18658 km², increased by 59%; the grassland area increased from 7708 km² to 10160 km² in 1990～2000, decreased to 5128 km² in 2000～2010, and increased to 6907 km² in 2010～2022, with the overall area decreased by 10%. From 1990 to 2022, water wetlands and construction land increased from 254 km² and 92 km² to 520 km² and 748 km² , respectively, with an increase of 104% and 713% respectively. This corresponds to the expected results of the social and economic development in Daliangshan area and the policies of "Natural Forest Protection Project" and "returning farmland to Forest and grassland". Combined with the analysis of spatial change of land use, the growth of woodland area is mainly from the transformation of cultivated land, and the initial growth of grassland area comes from the reverse succession of forest land after felling. After the protection of policies such as "Natural Forest Protection Project", the growth of grassland area mainly comes from cultivated land. After 2010, the forest land protection policy in Daliangshan area changed from planting artificial forest land to maintaining existing achievements, so the growth rate of forest land slowed down. Overview 1990～2022, especially after the implementation of the "Natural Forest Protection Project" in 1998, the ecological environment of Daliangshan area continued to improve, However, in the on～the～spot investigation, some woodlands are still cut down to form grasslands, and a large area of artificial coniferous forest also has the problem of single ecosystem and prone to fire. Through the discussion and analysis of land use change and its driver factors in Daliangshan area, the author aims to provide support for further formulation of relevant policies and regulations in Daliangshan area.