Decoupling factors affecting plant diversity and cover on extensive green roofs

MacIvor, J. Scott; Margolis, Liat; Puncher, Curtis L.; Matthews, Benjamin J. Carver

doi:10.1016/j.jenvman.2013.09.014

Cited by 70 publications

(39 citation statements)

References 24 publications

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“…Green roof modules were installed in the summer of 2011 in an experimental set up of thirtythree 1 m by 2 m modules (only 27 modules were available for use in this study) each installed with one plant community, substrate type, and irrigation schedule (MacIvor et al, 2013) (Fig. 1).…”

Section: Sitementioning

confidence: 99%

“…The substrate treatment level included two different mixtures (GroBark, Georgetown, ON) at 10-15 cm depths (this varied between modules slightly due to wind scour, substrate settling, and biomass accumulation over several years): an 'inorganic' aggregate mix using FLL criteria (FLL, 2008) (45% maximum water holding capacity), and an 'organic' mix containing 25% organic content by weight (>60% water holding capacity) (MacIvor et al, 2013).…”

Section: Substratementioning

confidence: 99%

See 1 more Smart Citation

Air temperature cooling by extensive green roofs in Toronto Canada

MacIvor

Margolis

Perotto

et al. 2016

Ecological Engineering

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Section: Sitementioning

confidence: 99%

Section: Substratementioning

confidence: 99%

Air temperature cooling by extensive green roofs in Toronto Canada

MacIvor

Margolis

Perotto

et al. 2016

Ecological Engineering

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“…Climates with low or strongly seasonal precipitation may not provide enough water in a green roof context to sustain many otherwise drought adapted species. Even if a green roof plant assemblage can survive under a particular regional water regime it can still suffer reduced plant cover, be constrained in species or growth form diversity, or suffer reduced aesthetics (Nagase and Dunnett 2010;Schroll et al 2011b;MacIvor et al 2013). Other aspects of regional climate such as temperature extremes can also restrict plant choices.…”

Section: Climatic Influence On Green Roof Water Dynamicsmentioning

confidence: 99%

“…12). Overall, irrigation can greatly expand the pool of plant species, growth forms, and functional types that are suitable for a particular green roof context, particularly on shallow substrates or in water limited climates (Monterusso et al 2005;Price et al 2011;Schroll et al 2011b;MacIvor et al 2013). Even if plants can survive a particular green roof water environment without irrigation, their growth and traits related to aesthetics such as flowering and canopy cover can be improved with irrigation (Nagase and Dunnett 2010;Schroll et al 2011).…”

Section: Irrigationmentioning

confidence: 99%

Water Through Green Roofs

Lambrinos

2015

Ecological Studies

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How green roofs process water is a critical component of their function and effective management. As green roof technology has spread from northern Europe's relatively cool and humid climate, green roof designs have had to adapt to regional variations in the timing and availability of water. The development of regionally appropriate designs requires a mechanistic understanding of green roof water relations, plant eco-physiology and irrigation technology. Emerging designs effectively match environmental conditions, substrate characteristics, plant physiological traits, plant community interactions, and expert systems for applying supplemental water.Keywords Evapotranspiration · Hydrology · Irrigation · Plant selection · Plant water use strategies · Xeric climates Green Roofs as Hydrological SystemsThe vast majority of the water that lands on a conventional roof quickly flows off. In sharp contrast, water that lands on a green roof enters a complex hydrological system (Fig. 4.1). Stocks of water are held on and within plants, in substrate, and in various layered materials such as drainage and water retention fabrics. Water exits the system through evaporation from the substrate and plant surfaces, transpiration, and runoff. The magnitude of the various stocks of water as well as the flux of water between stocks and out of the system is governed by complex interactions among green roof components and the physical environment. This complexity makes green roof performance inherently dynamic and contingent on the details of system design and local conditions (Berndtsson 2010).Nevertheless, most extensive green roofs share broadly similar hydrological characteristics. The bulk of the standing stock of water on a green roof is held in the substrate. The amount of water intercepted and held by vegetation is comparatively

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“…Although many studies have looked at the effect of commercially available substrates on green roof hydrolytic properties (Bengtsson 2005, Morgan et al 2013, Wang et al 2013, Zheng et al 2013, Berretta et al 2014, Volder and Dvorak 2014, there has been little research on alternative recycled materials for use in green roof growing substrate (Molineux et al 2009, Mickovski et al 2013. Furthermore, fewer studies still have focused on their suitability for plant performance and diversity (MacIvor et al 2013) and the role of different aggregates in affecting the process of succession is unknown. Successional processes on green roofs are likely to be extremely slow, mainly driven by the lack of water and nutrients (Emilsson 2008, Bates et al 2013 and previous experiments have concentrated upon annual plants (Nagase and Dunnett 2013).…”

Section: Introductionmentioning

confidence: 99%