Abstract: Urban ecological space is indispensable in maintaining urban ecosystem balance, providing ecosystem services for the city, and improving life quality of urban residents. Reasonable delimitation of urban ecological space is important for constructing sustainable land spatial pattern and maintaining the balance between economic development and ecological construction. In this study, based on the evaluation of ecosystem services and ecological sensitivity, we delimited the ecological space of Suzhou by selecting the targeted evaluation indices and evaluation models, based on RS and GIS technology. The results showed that total area of ecological space in Suzhou is 4543.64 km², accounting for 52.48% of the city’s total area. The buffer area is 2465.11 km², accounting for 28.47% of the total area. Statistic analysis by Fragstats 4.2 showed that there were 2877 patches in the ecological space, indicating obvious fragmentation of ecological space in Suzhou. The statistic results of land use types of ecological space showed that ecological space was occupied by about 13% of urban construction land.

Key words: multi-scale, partial redundancy analysis., trace metal contamination, landscape heterogeneity