Accessibility navigation

Greywater impact on green roofs’ provision of ecosystem services

Kemp, S., Blanusa, T. and Hadley, P. (2017) Greywater impact on green roofs’ provision of ecosystem services. Acta Horticulturae, 1189 (103). pp. 513-518. ISSN 0567-7572

Text - Accepted Version
· Please see our End User Agreement before downloading.


It is advisable to refer to the publisher's version if you intend to cite from this work. See Guidance on citing.

To link to this item DOI: 10.17660/ActaHortic.2017.1189.103


Previous research showed that some herbaceous perennial species could offer summertime cooling better than succulent species on green roofs (GRs), if supplementary irrigation is available during times of drought. In light of increasing water shortages, use of greywater (GW) instead of mains tap water (TW) for this purpose comes into focus. A glasshouse experiment was conducted in summer 2015 at the University of Reading (UK) to assess the impact of GW irrigation on the health, growth and functioning (in terms of leaf stomatal conductance (gs) and associated water uptake) of four plant genotypes (Salvia, Stachys, Heuchera and Sedum), and their ability to deliver ecosystem services, particularly cooling. Twenty-two replicates of each genotype, plus controls of bare, unvegetated substrate, were irrigated with fixed volumes of TW or synthetic GW for 6 weeks. Plant growth and visual quality, and gs were measured. In Week 7, daily water loss from each container following saturation was determined. For the first 6 weeks, plant growth, visual quality and gs were similar for both TW and GW treatments for all genotypes, indicating no negative impact of short-term GW irrigation and no apparent impact on cooling when plants were well-watered. However, in Week 7 water uptake (and thus presumably gs) was significantly lower for plants irrigated with GW compared to TW for some genotypes (Salvia and Heuchera), especially as substrate became drier, suggesting a reduction in evapotranspiration and potentially reduced cooling service when the soil is dry.

Item Type:Article
Divisions:Life Sciences > School of Agriculture, Policy and Development > Department of Crop Science
ID Code:75424
Additional Information:ISBN: 9789462611856
Publisher:International Society for Horticultural Science


Downloads per month over past year

University Staff: Request a correction | Centaur Editors: Update this record

Page navigation