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Table 2 Summary of the nine extensive green roofs in order of age at time surveyed

From: Vegetation composition of old extensive green roofs (from 1980s Germany)

Roof # Roof name Age at survey Year installed Area (m2) Slope (°) # quadrats # species
1 FH Nürtingen 23 1987 258 0 12 32
2 Römermuseum, Köngen 23 1987 350 17 18 9
3 Pliensaufriedhof, Esslingen 33 1977 500 0 15 11
4 Gärtnereihof Tübingen 24 1986 2,160 15 16 21
5 Verkehrsbetrieb Area 1 25 1986 1,860 0 14 21
6 Verkehrsbetrieb Area 2 25 1986 2,064 0 14 21
7 Stuttgart Rathausgaragedach, PV 21 1990 1,300 0 15 26
8 Stuttgart Rathausgaragedach, low 21 1990 1,000 0 14 30
9 Killesberg Dach 20 1991 450 30 18 23