Abstract:
Land use change is the main cause of changes in agro-ecosystem services. According to the land use data of Hanzhong Basin in 2005-2017, the land use transfer matrix is used to analyze the land use change in Hanzhong Basin. On this basis, the change of agricultural ecosystem service value in Hanzhong Basin was quantitatively analyzed, and the impact of land use change on the agricultural ecosystem service in this region was revealed. The results show that from 2005 to 2017, the overall land use of the Hanzhong Basin showed a trend of “three reductions and three increases”. In terms of reduced arable land, grassland and waters, construction land, orchards and woodland have increased. The conversion area was 40 737.24 hm2, accounting for 9.42% of the total area. The cultivated land is mainly converted to construction land, forest land and orchard by the influence of urbanization and agricultural structural adjustment. The construction land mainly comes from cultivated land and forest land, and the newly added area reaches 5 878.8 hm2. This shows that the land use type change in the Hanzhong Basin is greatly affected by urbanization and economic development.The value of agro-ecosystem services in the Hanzhong Basin from 2005 to 2017 increased by 462.269 billion yuan due to changes in land use and agricultural structure. The value of each service showed an increase, with the largest increase of 128.56%. It shows that the land use conversion in Hanzhong Basin is conducive to the development of agro-ecosystem, but it still needs to pay attention to the impact of arable land conversion on agro-ecosystem services.The value of agro-ecosystem services in all land types is increasing. Due to the impact of individual service functions, the rate of change in agro-ecosystem services of agricultural land is greater than the rate of change in agro-ecosystem services in forests. The increase in regulating services and cultural services indicates to some extent that the ecological environment in the Qinba Mountains is improving.
