| Ecosystem services refer to the materials and services obtained directly or indirectly by human beings in the process of the formation of ecosystem and the evolution of ecological environment,which have various effects such as purifying water quality,preventing wind and fixing sand,protecting biodiversity,etc.,and providing a variety of protection for human living environment.In recent years,with the rapid development of urbanization and industrialization,human behavior intervention for ecosystem services are increasingly intense,unreasonable land utilization and the social production and living waste caused by the gradual destroying the self-regulation of ecosystem services and tradeoffs and collaborative relationships between different service function,the ecological sensitivity to rise.Changchun,as the capital of Jilin Province and the central city of Northeast Asia Economic Circle,has been facing great threats and challenges since 2000 with the introduction of the strategy of"Revitalizing Northeast China",the adjustment of industrial structure and the gradual development of industrial transformation centered on Harbin-Changchun city cluste Changji-Tu Open and Development Pilot Area.Based on Landsat TM/OLI remote sensing images,the land cover information in the study area was extracted by object-oriented classification method and decision tree algorithm,and the spatiotemporal dynamic changes of land cover were analyzed.Using Arc GIS software to operate climate,soil,watershed and DEM data space of study area.On this basis,using In VEST model to evaluate quantificationally carbon,water yield,soil conservation and habitat quality four kinds of ecosystem services in the study area,and to explore main spatial and temporal variations of ecosystem services and tradeoffs and collaborative relationships between different ecosystem services in Changchun city since 2000;Landscape pattern index method was introduced to analyze the impact of land cover change on regional ecosystem services.The main conclusions are as follows:(1)The accuracy of land cover information extraction in Changchun reached 90%,which met the analysis requirements of this study.Cultivated land,woodland and artificial surface have always been the main land cover types in Changchun.During2000-2020,the area of each land cover type is changing dynamically,and the total converted area is 2855.85 km~2.(2)Carbon storage,water yield and soil conservation increased by 0.15×10~8 mg,2.03×10~9 m~3 and 3.42×10~7 t,respectively,while habitat quality decreased by 0.0018 in period of 2000-2020.There are trade-offs and synergies among different ecosystem services.During 20 years,there was a synergistic relationship among the four ecosystem services of carbon storage,water yield,soil conservation and habitat quality.(3)The ecosystem services of different land cover types in Changchun have great differences.The land type with the strongest carbon storage capacity is wetland,with carbon storage per unit area being 3.90×10~4 mg/km~2.The land type with the strongest capacity of water production service is water yield,which is 3.73×105 m~3/km~2 per unit area.The land type with the strongest soil conservation service ability was woodland,and the soil conservation amount per unit area was 8599.56 t/km~2.Forest land had the strongest habitat quality service ability,and the habitat quality was 0.9901.From 2000to 2020,the Number of patches(NP),Patch density(PD)and Landscape shape index(LSI)in Changchun increased.Percent of landscape(PLAND),the Largest patch index(LPI)and Aggregation index(AI)decreased,which showed that the fragmentation and complexity of land cover in Changchun increased,the agglomeration degree of the same land type weakened,and the status of the dominant land type declined.The correlation between landscape index and ecosystem services was significant,indicating that ecosystem services were affected by changes in land cover. |
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