Evaluation and Complex Relations Analysis of Ecosystem Services Based on Spatial-temporal Evolution of Land Use in a Resource-based City

In order toreveal the changing characteristics and trends of land use and ecosystem services in Daqing, a typical resource-based city, from 1990 to 2020, and provide typical cases and theoretical support for the transformation of resource-based cities.Based on four periods of land use data in 1990, 2000, 2010 and 2020, the InVEST model was used to simulate the changes in four ecosystem service functions (carbon storage, water yield, soil conservation, and habitat quality) in Daqing and relationships of the trade-offs and synergistic among ecosystem services were evaluated.The research results indicate that during the period of 1990-2020, the area of grassland in Daqing showed a decreasing trend, while the area of construction land continued to increase; All four ecosystem services showed a trend of decreasing first and then increasing, with soil conservation and water yield showing larger changes; there was a "trade-off" relationship between water yield and the other three ecosystem services; with a synergistic relationship between carbon storage, habitat quality, and soil conservation. the enhancement of forested land and water area can improve habitat quality and carbon storage, and the correlation between the two ecosystem services, namely water yield and soil conservation, and the proportion of land use types is weak. The research results have a certain positive effect on formulating reasonable land use policies and improving ecosystem service functions.