The Research On The Service Value Of Land Ecosystem And Its Spatio-Temporal Evolution In Qinba Mountain Area

With the rapid improvement of urbanization,a large amount of construction land is needed.The increase of a large amount of construction land will squeeze cultivated land,woodland,grassland and other ecological lands.Such extensive land use patterns for a long time have led to the destruction of land ecosystems.The value of ecosystem services is reduced,and environmental pollution problems frequently occur.Therefore,the environmental problems brought about require a large amount of ecological restoration costs.The rapid development of our country’s economy over the past few decades has made the contradiction between man and nature increasingly severe.The rapid consumption of natural resources and the continuous destruction of the natural environment have led to the frequent emergence of environmental pollution problems in my country in recent years.At the same time,it will also have a significant impact on our country’s future sustainable development potential.The calculation and evaluation of the service value of the land ecosystem can effectively reflect the ecological value of the regional land ecosystem,and provide a theoretical basis and policy reference for practical issues such as environmental governance and planning.The Qinba mountainous area is an important ecological function area in our country,and the ecological resources are very rich.The analysis of such an area is of great significance and value.Based on related theories and scholars’ research results,using remote sensing data obtained by National Aeronautics and Space Administration,the Qinba Mountain and its internal cities are analyzed for the value of land ecosystem services in different periods,different types of land,and different services,and research on the Qinba Mountain and various cities The temporal and spatial evolution of service value.The research found that:(1)From the perspective of the overall land use structure and changes in the fourth phase,woodland and grassland are the main land use types in the Qinba Mountains.Then the proportions from high to low are cultivated land,construction land,water area,and unused land.(2)From the perspective of the land use intensity in the fourth phase,the comprehensive index of land use intensity in the Qinba mountainous area is at a medium level,indicating that the overall land development in the Qinba mountainous area is not strong.(3)From the perspective of ESV and changes in the Qinba mountainous area,the ESV of woodland is the highest,accounting for about 70% of the total value.Followed by grassland,cultivated land,water area,and unused land.The ESV in the Qinba Mountains has been increasing year by year,and the growth rate has been stable.(4)Judging from the ESV of various cities in the Qinba Mountains,Hanzhong City has the highest ESV and Nanchong City has the lowest ESV.From the perspective of the spatial differentiation of the total value of each city,the ESV of the Qinba mountainous area presents a spatially positively correlated distribution,and both high-value areas and low-value areas tend to cluster.The ESV of a single function and its change trend in each city is roughly the same as the overall change trend of each city,and the ESV of a single function in the Qinba mountainous area also has an obvious spatial positive correlation.