Dynamic Land Use Change of Hainan Island in Recent 20 Years Based on GLC30 Data

Land use/cover change（LUCC）is one of the core contents of global change research.In the past 20 years，the land use in Hainan Island has changed significantly due to dual effects of natural environment and human society and economy，but its spatial and temporal dynamic characteristics and pattern are still unclear.Based on GlobeLand30（GLC30）global land cover data，spatio-temporal distribution pattern and dynamic changes of land use in Hainan Island was analyzed in recent 20 years.Results showed that，spatial distribution pattern of land use in Hainan Island was mainly cultivated land and woodland.The cultivated land was mainly distributed in coastal areas，and woodland was mainly distributed in central mountainous areas of Hainan Island.The increase of woodland was the main spatio-temporal change pattern of land use in Hainan Island during 2000—2010，which was mainly from transformation of cultivated land，grassland，wetland and water body.From 2010 to 2020，significant increase of cultivated land and construction land were the main spatio-temporal change pattern of land use in Hainan Island.The cultivated land was mainly transfer from woodland，while the construction land was transfer from cultivated land and woodland.During 2000—2020，the area of forest land and construction land were increased significantly，while the area of cultivated land and grassland were decreased significantly.Changes of wetland，water body，bare land and sea area were very small.Increase of woodland was converted from grassland，which was mainly distributed in central mountainous area and Wenchang City in the northeast of Hainan Island.Increased construction land was mainly from conversion of cultivated land，woodland，grassland，and development of wetland，water body and sea area，which were mainly distributed in surrounding areas of coastal urban settlements of Hainan Island.Decreased cultivated land was mainly converted into woodland，which was distributed in surrounding areas in Haikou，Changjiang，Qionghai，Wanning and other cities and counties of Hainan Island.Grassland reduction area was mainly distributed in central mountainous area of Hainan Island，which was transformed into forest land.Changes of land use degree in Hainan Island was small in 2000，2010 and 2020，which indicated that stability of land use / cover change in Hainan Island was high，and intensity of human land development was moderate.It could provide scientific reference for rational development of land use in Hainan Island and construction of Hainan Free Trade Port in the future.