scholarly journals Cooling Performances on Rainless Days of Extensive Green Roofs Planted with Different Ornamental Species

HortScience ◽  
2017 ◽  
Vol 52 (3) ◽  
pp. 467-474
Author(s):  
Yann-Jou Lin ◽  
Ai-Tsen Su ◽  
Bau-Show Lin
Keyword(s):  
Plant Species ◽  
Plant Cover ◽  
Ornamental Plants ◽  
Green Roofs ◽  
Species Selection ◽  
Aesthetic Quality ◽  
Four Seasons ◽  
Canopy Volume ◽  
Extensive Green Roofs ◽  
Selection Of

This study investigated the cooling performances of extensive green roofs (EGRs) planted with 12 ornamental plants on rainless days in a subtropical city for 1 year. Imitating the construction of an EGR, 48 modules were constructed and each module was planted as a monoculture with 100 plants each. Plant growth and greening performance were measured every 2 weeks. Temperatures, solar radiation intensities, and substrate water contents were measured continuously and recorded every 5 minutes. The analyzed results showed that both plant species selection and seasonal variation had a significant impact on the noontime cooling benefit. The modules planted with taller plants, more extensive plant cover, higher albedo, and greater canopy volume had a greater noontime cooling benefit. As the seasons changed, the albedo and canopy volume of the modules were primarily responsible for differences in the noontime cooling benefit provided by the different plant species. Over an entire year of observation, the results of this research could inform the selection of plant species by landscape designers for EGRs with the aim of providing greater cooling benefits and aesthetic quality overall four seasons.

The effects of growth form on the impact of companion planting of nectar-producing plant species with Sedum album for extensive green roofs

2020 ◽  
Vol 56 ◽  
pp. 126875
Author(s):  
Tatsuya Matsuoka ◽  
Kazuaki Tsuchiya ◽  
Susumu Yamada ◽  
Jeremy Lundholm ◽  
Toshiya Okuro
Keyword(s):  
Plant Species ◽  
Growth Form ◽  
Green Roofs ◽  
The Impact ◽  
Extensive Green Roofs

scholarly journals Green Roof Plant Suitability Analysis for Northern Climates

2013 ◽  
Vol 23 (5) ◽  
pp. 563-574 ◽  
Author(s):  
Katherine L. Vinson ◽  
Youbin Zheng
Keyword(s):  
Plant Species ◽  
Green Roof ◽  
Green Roofs ◽  
Plant Production ◽  
Suitability Analysis ◽  
Production Growth ◽  
Diverse Plant Species ◽  
Extensive Green Roofs ◽  
Different Levels ◽  
Diverse Plant

To select plant species and species combinations for northern climates, mats with different plant species and species combinations were constructed on a green roof plant production farm and later transported and installed on an urban rooftop. There were three treatments: two different planting combinations, which together consisted of 10 diverse plant species [both stonecrop (Sedum) species and nonstonecrop species], and a control, which consisted of 26 stonecrop species used for standard mat production. Growth measurements and observations were made at both sites and special attention was paid to the performance of species during the harvest, transportation, and installation stages, as well as during recovery postinstallation. All species but false rock cress (Aubrieta cultorum) were found to be suitable for extensive green roof applications in northern climates, although there were variations of suitability among the species. Good, mediocre, and poor interactions formed between numerous species, displaying different levels of compatibility. Finally, all species were considered appropriate for a mat production system; species that failed to germinate, species planted postinstallation, the frequently displaced rolling hens and chicks (Jovibarba sobolifera), and false rock cress were exceptions. Overall, many species in this study displayed successful, well-rounded growth. Based on results, species and species combinations were recommended for extensive green roofs in northern climates.

scholarly journals About extensive green roofs

2020 ◽  
Vol 24 (5) ◽  
pp. 5-11
Author(s):  
I.Y. Bochkova ◽  
◽  
M.D. Tulush ◽  
Keyword(s):  
Green Roofs ◽  
Specific Weight ◽  
Modern Approach ◽  
Planting Material ◽  
Modern Cities ◽  
Literary Sources ◽  
History Of ◽  
Extensive Green Roofs ◽  
Modern Technologies ◽  
Selection Of

There are so many things made of concrete, glass and metal in modern cities. All of this displace nature and there is no space for planting. Plants produce oxygen and clean the environment. That is why the landscaping of the roofs of buildings is a kind of compensation in landscaping. The article is about studying methods of creating extensive green roofs from the origin to nowadays. The work includes the study of historical, architectural and regulatory documents and some literary sources. It also includes some facts from the history of green roofs creation, which appeared in the 9th century, on the example of the old house of the Vikings, who lived on the territory of the Faroe Islands. There is a comparative analysis of historical and modern technologies in the article. The design features of extensive roof landscaping are considered. The study revealed modern techniques of extensive landscaping, as well as a list of plants that are resistant to roof landscaping. Recommendations for the usage of waterproof materials like bitumen roll and other are given. The modern approach to the selection of substrates for growing plants on extensive green roofs is also considered. The study revealed modern techniques of extensive landscaping, as well as a list of plants that are resistant to roofing landscaping. It has been revealed that modern materials significantly reduce the specific weight of the construction and ensure the excellent efficiency of the system and the viability of plants during the all working lifespan of the roof. They are discussed the technology of growing planting material for roof landscaping like moss or sedum mats, growing plants in pallets and multiboards, etc.

scholarly journals Plant cover and floristic composition effect on thermal behaviour of extensive green roofs

2015 ◽  
Vol 92 ◽  
pp. 305-316 ◽  
Author(s):  
Piero Bevilacqua ◽  
Julià Coma ◽  
Gabriel Pérez ◽  
Cristina Chocarro ◽  
Alejandro Juárez ◽  
...  
Keyword(s):  
Thermal Behaviour ◽  
Plant Cover ◽  
Floristic Composition ◽  
Green Roofs ◽  
Composition Effect ◽  
Extensive Green Roofs

Preserving plant diversity on extensive green roofs – theory to practice

2016 ◽  
Vol 62 (1-2) ◽  
pp. 103-111 ◽  
Author(s):  
Amiel Vasl ◽  
Amy Heim
Keyword(s):  
Green Roof ◽  
Green Roofs ◽  
Theoretical Work ◽  
Ecological Systems ◽  
Species Selection ◽  
Future Research ◽  
Dispersal Patterns ◽  
Roof Design ◽  
Extensive Green Roofs ◽  
Maintenance Of Diversity

The growing phenomenon of green roofs throughout the world mostly results in the establishment of extensive green roofs with low species diversity. However, research from the last few decades has shown that several advantages can accrue from diverse ecological systems, such as increased faunal diversity, storm water retention, thermal stability, pollution mitigation, and visual appeal. The maintenance of diversity on extensive green roofs has not been closely examined and few studies incorporate methods to ensure long-term coexistence into green roof design. Theoretical work has placed much focus on the niche and neutral theories that attempt to explain diversity as a result of the existence of different habitats or of demographic and dispersal patterns, respectively. These theories have resulted in several theoretical and practical recommendations for the maintenance of diversity in ecological systems and could suggest additional practices that would support biodiverse green roofs. We hereby review and discuss relevant theory and supporting research to provide suggestions regarding future research in the field as well as practical green roof construction recommendations and species selection.

scholarly journals Moisture Content of Extensive Green Roof Substrate and Growth Response of 15 Temperate Plant Species during Dry Down

HortScience ◽  
2011 ◽  
Vol 46 (3) ◽  
pp. 518-522 ◽  
Author(s):  
Jennifer M. Bousselot ◽  
James E. Klett ◽  
Ronda D. Koski
Keyword(s):  
Moisture Content ◽  
Plant Species ◽  
Green Roof ◽  
Green Roofs ◽  
Herbaceous Plant ◽  
Herbaceous Species ◽  
Extensive Green Roof ◽  
Dry Down ◽  
Porous Soils ◽  
Extensive Green Roofs

Success of extensive green roof vegetation depends primarily on associated plant species' ability to survive the low moisture content of the substrate. As a result of the well-drained nature of the substrate, plants adaptable to dry, porous soils are primarily used in extensive green roof applications. Although Sedum species have dominated the plant palette for extensive green roofs, there is growing interest in expanding the plant list for extensive green roof systems. To effectively select suitable plants, species need to be evaluated in terms of their response to gradual and prolonged dry down of the substrate. A study to determine the relative rates of dry down for 15 species was conducted in greenhouse trials. During dry downs that extended over 5 months, the substrate of succulent and herbaceous species dried down at different rates. The change in moisture content of the substrate was not consistent among succulent and herbaceous plant species during the initial 18 d of dry down. Despite differences in rate of dry down, the succulent species, as a group, maintained viable foliage for over five times longer than the herbaceous species. The revival rates of the succulent species were nearly double those of the herbaceous species. Therefore, not only are succulent species more likely to survive during periods of drought, but these species are more likely to resume growth soon after water is again made available.

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