Effects of recycled aggregate growth substrate on green roof vegetation development: A six year experiment

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@article{8d18e044ce3c43faaacd5f9827c5b73d,
title = "Effects of recycled aggregate growth substrate on green roof vegetation development: A six year experiment",
abstract = "Green roofs have the potential to address several of the environmental problems associated with urbanisation, and can be used as mitigation for habitats lost at ground level. Brown roofs (a type of green roof) can be used to mitigate for the loss of brownfield habitat, but the best way of designing these habitats remains unclear. This paper reports an experiment to test the effects of different types of recycled aggregate on the development of vegetation assemblages on brown roof mesocosms. Five recycled aggregates were tested: (1) crushed brick, (2) crushed demolition aggregate, (3) solid municipal waste incinerator bottom ash aggregate, (4) a 1:1 mix of 1 and 2, and (5) a 1:1 mix of 3 and 2. Each was seeded with a wildflower mix that also included some Sedum acre and vegetation development was studied over a six-year period. Species richness, assemblage character, number of plants able to seed, and plant biomass were measured. Drought disturbance was the key factor controlling changes in plant assemblage, but effects varied with substrate treatment. All treatments supported a similar plant biomass, but treatments with a high proportion of crushed brick in the growth substrate supported richer assemblages, with more species able to seed, and a smaller amount of Sedum acre. Crushed brick, or recycled aggregates with a high proportion of crushed brick, are recommended as good growth substrate materials for encouraging brown roof plant diversity. This investigation demonstrates the importance of multi-year studies of green roof development for the generation of robust findings.",
keywords = "Brown roof, Crushed brick, Development mitigation, Drought disturbance, Rooftop garden, Succession",
author = "Bates, {Adam J.} and Greswell, {Richard B.} and Jonathan Sadler and Rae Mackay",
year = "2015",
month = mar,
day = "1",
doi = "10.1016/j.landurbplan.2014.11.010",
language = "English",
volume = "135",
pages = "22--31",
journal = "Landscape and Urban Planning",
issn = "0169-2046",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Effects of recycled aggregate growth substrate on green roof vegetation development

T2 - A six year experiment

AU - Bates, Adam J.

AU - Greswell, Richard B.

AU - Sadler, Jonathan

AU - Mackay, Rae

PY - 2015/3/1

Y1 - 2015/3/1

N2 - Green roofs have the potential to address several of the environmental problems associated with urbanisation, and can be used as mitigation for habitats lost at ground level. Brown roofs (a type of green roof) can be used to mitigate for the loss of brownfield habitat, but the best way of designing these habitats remains unclear. This paper reports an experiment to test the effects of different types of recycled aggregate on the development of vegetation assemblages on brown roof mesocosms. Five recycled aggregates were tested: (1) crushed brick, (2) crushed demolition aggregate, (3) solid municipal waste incinerator bottom ash aggregate, (4) a 1:1 mix of 1 and 2, and (5) a 1:1 mix of 3 and 2. Each was seeded with a wildflower mix that also included some Sedum acre and vegetation development was studied over a six-year period. Species richness, assemblage character, number of plants able to seed, and plant biomass were measured. Drought disturbance was the key factor controlling changes in plant assemblage, but effects varied with substrate treatment. All treatments supported a similar plant biomass, but treatments with a high proportion of crushed brick in the growth substrate supported richer assemblages, with more species able to seed, and a smaller amount of Sedum acre. Crushed brick, or recycled aggregates with a high proportion of crushed brick, are recommended as good growth substrate materials for encouraging brown roof plant diversity. This investigation demonstrates the importance of multi-year studies of green roof development for the generation of robust findings.

AB - Green roofs have the potential to address several of the environmental problems associated with urbanisation, and can be used as mitigation for habitats lost at ground level. Brown roofs (a type of green roof) can be used to mitigate for the loss of brownfield habitat, but the best way of designing these habitats remains unclear. This paper reports an experiment to test the effects of different types of recycled aggregate on the development of vegetation assemblages on brown roof mesocosms. Five recycled aggregates were tested: (1) crushed brick, (2) crushed demolition aggregate, (3) solid municipal waste incinerator bottom ash aggregate, (4) a 1:1 mix of 1 and 2, and (5) a 1:1 mix of 3 and 2. Each was seeded with a wildflower mix that also included some Sedum acre and vegetation development was studied over a six-year period. Species richness, assemblage character, number of plants able to seed, and plant biomass were measured. Drought disturbance was the key factor controlling changes in plant assemblage, but effects varied with substrate treatment. All treatments supported a similar plant biomass, but treatments with a high proportion of crushed brick in the growth substrate supported richer assemblages, with more species able to seed, and a smaller amount of Sedum acre. Crushed brick, or recycled aggregates with a high proportion of crushed brick, are recommended as good growth substrate materials for encouraging brown roof plant diversity. This investigation demonstrates the importance of multi-year studies of green roof development for the generation of robust findings.

KW - Brown roof

KW - Crushed brick

KW - Development mitigation

KW - Drought disturbance

KW - Rooftop garden

KW - Succession

UR - http://www.scopus.com/inward/record.url?scp=84912052176&partnerID=8YFLogxK

U2 - 10.1016/j.landurbplan.2014.11.010

DO - 10.1016/j.landurbplan.2014.11.010

M3 - Article

AN - SCOPUS:84912052176

VL - 135

SP - 22

EP - 31

JO - Landscape and Urban Planning

JF - Landscape and Urban Planning

SN - 0169-2046

ER -