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Extensive vegetated roofs in Sweden

establishment, development and environmental quality

Emilsson, Tobias (2006). Extensive vegetated roofs in Sweden. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2006:37
ISBN 91-576-7086-2
[Doctoral thesis]

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Official URL: http://www.urbanbiotopes.se


This thesis discusses extensive vegetated roofs, i.e. vegetation systems placed on top of buildings as an aesthetical and/or ecological cover. Specific objectives was to (1) quantify how establishment techniques, substrates and plant mixes influence establishment and development of extensive vegetated roofs, (2) investigate effect of vegetated roofs on stormwater quality, and quantify how maintenance and starting fertilisation influences stormwater quality, and (4) investigate the role of vegetated roofs in planning tools for urban green space. The studies on vegetation establishment and development was carried out at the Augustenborg Botanical Roofgarden, Malmö (55°34’34’’N, 13°1’42’’E), the nutrient runoff was investigated on commercially installed systems in the Malmö-Lund region and in a greenhouse study. The role of vegetated roofs in planning of green areas was performed as a literature study. Vegetation establishment and development was investigated in relation to substrate, species and establishment method. Nutrient runoff was in the greenhouse study investigated in relation to fertiliser type, vegetation type and fertiliser amount. Prefabricated vegetation mats had an advantage in establishment in creating high plant cover during the first year, which can be important on exposed sites. Establishment was similar for plug plants and cuttings. The commercial substrate was beneficial for establishment. The advantage in succulent cover of vegetation mats had disappeared after 3.5 years. All establishment techniques achieve the same long-term succulent cover. Moss cover increased over time and was at the end of the study dominating the system with approx 50-80% cover. Maintenance fertilisation can cause degradation of stormwater quality if conventional fertilisers are used. Conventionally installed vegetated roofs were found to be a source of potassium and phosphorous, and a sink for nitrogen. Vegetated roofs had a minor influence on heavy metal runoff. Spontaneous establishment on extensive vegetated roofs was low, which is beneficial from a maintenance perspective but unfavourable from a biodiversity perspective. The Green Space Factor tool was found to overestimate the environmental functions of thin vegetated roofs.

Authors/Creators:Emilsson, Tobias
Title:Extensive vegetated roofs in Sweden
Subtitle:establishment, development and environmental quality
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :April 2006
Number of Pages:34
ALLI. Emilsson, T. & Rolf, K. 2005. Comparison of establishment methods for extensive green roofs in southern Sweden. Urban Forestry & Urban Greening 3:2, 103-111. II. Emilsson, T. Vegetation development on extensive vegetated roofs -Influence of substrate composition, establishment method and species mix. Manuscript III. Czemiel Berndtsson, J., Emilsson, T. & Bengtsson, L. 2006. The influence of extensive vegetated roofs on runoff water quality, Science of The Total Environment 355:1-3, 48-63. IV. Emilsson, T., Czemiel Berndtsson, J., Mattsson, J.E. & Rolf, K. 2006. Effect of using conventional and controlled release fertiliser on nutrient runoff from various vegetated roof systems. Ecological Engineering (accepted for publication). V. Emilsson, T., Persson, J. & Mattsson, J.E. Evaluation of ecological surface values of vegetated roofs in two biotope focused planning tools. Manuscript.
Place of Publication:Alnarp
ISBN for printed version:91-576-7086-2
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:roofs, vegetation, sedum, growing media, plant establishment, fertilization, runoff water, sweden
Keywords:green roof, Sedum spp., establishment, fertilisation, stormwater quality, planning tools, prefabricated vegetation mats, cuttings, plug plants
Permanent URL:
ID Code:1088
Department:(LTJ, LTV) > Institutionen för landskaps- och trädgårdsteknik (t.o.m. 061231)
Deposited By: Tobias Emilsson
Deposited On:18 Apr 2006 00:00
Metadata Last Modified:02 Dec 2014 10:09

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