Abstract: It is important to understand the spatiotemporal variations and the tradeoffs of urban ecosystem services for regional sustainable development. Based on the InVEST model and RUSLE model, we quantitatively evaluated carbon storage, water yield, and soil conservation services in Beijing in 1984, 1995, 2005 and 2018. Results showed that there was substantial land use change in Beijing during 1984-2018. The area of urban, water and woodland had increased by 18.1.7%, 42.7% and 10%, while the area of grassland, unused land and cropland had decreased by 63.4%, 31.8% and 31.6% respectively. Carbon storage, water yield, and soil conservation in Beijing had increased from 1984 to 2018 by 0.06×10⁸ t, 10.1×10⁸ m³ and 0.82×10⁸ t, respectively. The ecosystem services change index (ESCI) of carbon storage, water yield and soil conservation was different in the three periods. Spatially, the area with carbon storage loss and soil conservation gain had increased obviously. There was a clear synergetic relationship between carbon storage and soil conservation, whereas water yield had a clear trade-off relationship with carbon storage and soil conservation.

Key words: ecosystem services, trade-off, synergy, hotspot, Beijing.