Abstract:
The identification of zoning boundaries is an important point for zoning work and the rationality of zoning boundaries needs to be repeatedly verified in practical work. Further refining the ecological functions of land based on the land resources zoning can ensure the rationality of zoning boundaries and the consistency of internal geographical features. In this study, ecosystem services including water conservation, soil conservation and vegetation carbon sequestration were quantified as indicators of soil, water and heat resources and used to analyze the spatio-temporal changes from 2000 to 2019 based on GIS platform and the SOFM model. According to the average value of the above 3 ecosystem services in several years, the boundaries of ecological function zoning is revised on the basis of land resource zoning.The results showed that the overall matching degree of soil, water and heat resources has been improved from 2000 to 2019. However, there are differences between the growth rate and stability in different land resources zoning. The regions with the highest growth rate are sandy and desert regions, valley plain regions and loess gully regions with a rate of 3.25, 2.44 and 2.43 respectively and the stability pattern of matching degree of soil, water and heat resources is higher in the southeast and lower in the northwest. The SOFM model performed well in the regionalization of ecosystem function and 6 ecological function zones were divided eventually. Based on the 6 land resources zoning, the Loess Plateau was divided into 16 sub-regions including vegetation conservation regions, agricultural production regions, animal husbandry regions, agriculture and animal husbandry regions and ecologically fragile regions, etc.The results provide references for the land use development and agricultural production planning of the Loess Plateau.
