Effect of using conventional and controlled release fertiliser on nutrient runoff from various vegetated roof systems

Extensive vegetated roofs are becoming popular as a way to improve the environmental quality of cities. As more vegetated roofs are installed, there is a need for knowledge pertaining to maintenance and impact vegetated roofs have on stormwater quality Our study investigated nutrient runoff, substrate nutrient storage and plant uptake following fertilisation of vegetation mats, shoot-established vegetation systems and unvegetated substrate using three levels of fertiliser applied as either controlled release fertiliser (CRF), or as a combination of CRF and conventional fertiliser. Conventional fertilisers caused high nutrient concentrations in the runoff water. Concentrations decreased during the duration of the experiment but at the end of the experiment they were still higher than after fertilisation with CRF. Conventional fertiliser also increased the total nutrient runoff. Vegetation system type influenced nutrient runoff and fertilisation of old vegetation mats reduced the risk for nutrient leaching compared to fertilisation of newly established surfaces. This can be attributed to temporary storage in substrate and increased uptake by vegetation. The temporary storage of nutrients following fertilisation indicated that there might be a risk for prolonged leaching. Thus, addition of conventional fertilisers or nutrient-rich material during production can reduce stormwater quality. (C) 2006 Elsevier B.V. All rights reserved.

Czemiel Berndtsson, JustynaLund University,Lunds universitet,Avdelningen för Teknisk vattenresurslära,Institutionen för bygg- och miljöteknologi,Institutioner vid LTH,Lunds Tekniska Högskola,Division of Water Resources Engineering,Department of Building and Environmental Technology,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)tvrl-jcz (author)
Mattsson, Jan Erik (author)
Rolf, Kaj (author)
Avdelningen för Teknisk vattenresursläraInstitutionen för bygg- och miljöteknologi (creator_code:org_t)

In:Ecological Engineering: the Journal of Ecotechnology: Elsevier BV29:3, s. 260-2711872-6992
In:Ecological Engineering: Elsevier BV29:3, s. 260-2710925-8574

By the author/editor: Emilsson, Tobias; Czemiel Berndtss ...; Mattsson, Jan Er ...; Rolf, Kaj

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Civil Engineerin ...; and Water Engineerin ...

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