Rooftop farming on urban waste provides many ecosystem services

  • Baptiste J.-P. Grard
  • Claire Chenu
  • Nastaran Manouchehri
  • Sabine Houot
  • Nathalie Frascaria-Lacoste
  • Christine Aubry
Research Article
Part of the following topical collections:
  1. Urban agriculture

Abstract

Urban farming, especially on rooftops, is a popular and growing topic in both the media and the scientific literature, providing a genuine opportunity to meet some of the challenges linked to urban development worldwide. However, relatively little attention has been paid to date to the growing medium of green roofs, i.e., Technosols. A better understanding of the influence of Technosols and the link with ecosystem services is required in order to maximize the environmental benefits of urban rooftop farming. Between March 2013 and March 2015, a pilot project called T4P (Parisian Productive rooftoP, Pilot Experiment) was conducted on the rooftop of AgroParisTech University. Urban organic waste was used, and results were compared with those obtained using a commercial potting soil, based on yield and trace metal concentrations, substrate characterization, and the amount of leaching. An assessment of the ecosystem services expected from the Technosols was undertaken in terms of the output of food (food production and quality), regulation of water runoff (quantity and quality), and the recycling of organic waste. Indicators of these ecosystem services (e.g., yield, annual loss of mass of mineral nitrogen) were identified, measured, and compared with reference cases (asphalt roof, green roof, and cropland). Measured yields were almost equivalent to those obtained from horticultural sources in the same area, and the Technosols also retained 74–84% of the incoming rainfall water. This is the first quantitative analysis of ecosystem services delivered by urban garden rooftops developed on organic wastes, and demonstrates their multifunctional character, as well as allowing the identification of trade-offs. An ecosystem services approach is proposed for the design of soil-based green infrastructure of this kind and more generally for the design of sustainable urban agriculture.

Keywords

Urban farming Ecosystem services Technosol Urban waste Green roof Urban garden Productive rooftop Green infrastructure 

Notes

Acknowledgements

We are especially grateful to our partners: Topager® for co-creating these productive rooftops with us, and BioYvelinesServices and La Boite à Champignons for supplying growing substrates, and for their support. We also thank Antoine Juvin, Jean Noel Rampon, Véronique Etiévant, Thibaud Pereira, Muriel Colin, Clémentine Jeannetteau, Elsa Petit, Jean-Charles Michel, and Yvette Barraud-Roussel and Sibylle Paris for their help with the experiments and laboratory work. We acknowledge the financial support of AgroParisTech, Chaire EcoConception Vinci, and DIM ASTREA.

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Copyright information

© INRA and Springer-Verlag France SAS, part of Springer Nature 2017

Authors and Affiliations

  1. 1.UMR EcosysAgroParisTech, INRA, Université Paris SaclayThiverval GrignonFrance
  2. 2.UMR ESEAgroParisTech, CNRS, Université Paris-Sud, Université Paris SaclayOrsayFrance
  3. 3.UMR GenialAgroParisTech, INRA, Université Paris SaclayParisFrance
  4. 4.UMR Sad-AptINRA, AgroParisTech, Université Paris SaclayParisFrance

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