Green roofs: a green deposit or a real contribution to nature in the city

Ecology and benefits of green roofs: a study in Paris region

Figure 1 - Rosalind Franklin elementary school built in 2015 in Ivry-sur-Seine (94) (©Marc Barra – ARB IdF)

Figure 3 - Typology of green roofs used in the GROOVES study, based on the definition adopted by green roof designers.

Figure 4 - Vigie-Flore protocol with 1 m2 squares marked with stakes (©Lucile Dewulf)

Figure 5 - Allium schorodoprasum, Paris Villepinte exhibition center (©Audrey Muratet)

Figure 6 - Relationship between roof surface area and spontaneous flora (©Audrey Muratet)

Figure 7 - SPIPOLL protocol on the roof of the Cité de la mode et du design in Paris (©Gilles Lecuir)

Figure 8 - Examples of beetles and hymenoptera found on roofs

Figure 9 - Arthropod species richness by roof type

Figure 11 - GROOVES team takes substrate samples from green roofs (©ARB ÎdF)

Figure 12 - Positioning of the 34 roofs studied in the texture triangle. Gray dots correspond to RMQS soils (GIS Sol and INRAE Orléans).

Figure 13 - Microbial biomass found on roofs: on average higher than that of RMQS reference soils (high variability between roofs).

Figure 14 - Maximum water retention capacity as a function of substrate type

Figure 15 - Theoretical water retention capacity as a function of substrate depth

Figure 17 - Acceptance of the seasons: example of the vegetated roof at GTM Bâtiment headquarters in Nanterre (92), designed and managed by Topager (©Maxime Zucca – ARB ÎdF)

Figure 18 - A life cycle assessment (LCA) of vegetation systems may be necessary to better evaluate their overall impact (©Marc Barra – ARB ÎdF)

Figure 19 - Overview of green roofs sampled in GROOVES