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Table 1 Ecological resistance evaluation system

From: Multiple scenario simulation and optimization of an urban green infrastructure network based on complex network theory: a case study in Harbin City, China

Primary factor Secondary factor Grade Ecological resistance Economic resistance
Land-cover type Land-use type Urban land, rural settlement, other construction land 9 1
Beach, saline-alkali land, bare land 7 3
Paddy field, dry land, 5 5
Sparse forest, other woodland, canal, medium coverage grassland, marsh 3 7
Forestland, high coverage grassland, lake, reservoir, bush, 1 9
Terrain factor Elevation (m) 0–100 1 1
100–150 3 3
150–200 5 5
200–250 7 7
 > 250 9 9
Slope (°) 0–3 1 1
3–9 3 3
9–18 5 5
18–27 7 7
 > 27 9 9
Hydrological factor MNDWI  < 0 9 1
0–0.22 7 3
0.22–0.6 5 5
0.6–0.8 3 7
 > 0.8 1 9
Vegetation cover NDVI  < 0 9 1
0–0.2 7 3
0.2–0.33 5 5
0.33–0.6 3 7
 > 0.6 1 9
Density factor Road network density  > 1.25 9 1
0.85–1.25 7 3
0.52–0.85 5 5
0.20–0.52 3 7
0–0.20 1 9
Settlement density  > 0.80 9 1
0.60–0.80 7 3
0.40–0.60 5 5
0.20–0.40 3 7
0–0.20 1 9
  1. MNDWI modified normalized difference water index, NDVI normalized difference vegetation index