Abstract:
Taking Hanzhong city as an example, an assessment index of ecosystem quality was proposed by integrating ecosystem productivity, landscape pattern and ecosystem function, and the impact of human activities on ecosystem quality were analyzed by spatial analysis and geographic detector. The results show that: (1) From 2000 to 2020, the intensity of human activities in most rural areas has decreased significantly, while a gradual increase of human activities occurred in urban (town) and agricultural transformation areas. The areas with high intensity of human activities gradually shrinks from the northern and southern of Qinling-Daba Mountains to the middle of Hanzhong Basin. (2) The ecosystem productivity increased slightly (by 5.2%) in Hanzhong. The fragmentation and heterogeneity of landscape as a whole has increased, mainly resulting from the strong increase of the fragmentation and heterogeneity in arable land and orchard, while the decrease in forest and grassland. (3) Ecosystem services remained unchanged or declined slightly, and the total amount of ecosystem services decreased by 1.5%, in which food supply service and water conservation service increased by 24.2% and 12.5% respectively, soil conservation service decreased by 10.4%, and biodiversity maintenance service remained stable. (4)The impact of human activities on ecosystem quality in Hanzhong city is not significant. However, the intensity of human activities are weak negatively related to ecosystem quality in Hanzhong Basin, and are weak positively related to ecosystem services and productivity in the areas of Qinling-Daba middle mountains.It indicated that in good ecosystem quality region, both human activities intensity and its influencing range in regions are the main factors affecting ecosystem quality.(5) The intensity of land use and economic activity are the key factors causing ecosystem quality changes in the research area. The effect of land use intensity on ecosystem services and landscape pattern in Qinling-Daba middle mountains is obviously greater than that on ecosystem productivity.
