Next Article in Journal
Low-Input Herbicide Management: Effects on Rapeseed Production and Profitability
Previous Article in Journal
Subway Opening, Traffic Accessibility, and Housing Prices: A Quantile Hedonic Analysis in Hangzhou, China
Article Menu
Issue 7 (July) cover image

Export Article

Open AccessArticle
Sustainability 2018, 10(7), 2256; https://doi.org/10.3390/su10072256

CO2 Payoff of Extensive Green Roofs with Different Vegetation Species

1
Center for Environment, Health and Field Sciences, Chiba University, 6-2-1 Kashiwa-no-ha, Kashiwa, Chiba 277-0882, Japan
2
Kyodo KY-Tec Corporation, 1-15-1, Ebisu-minami, Shibuya-ku, Tokyo 150-0022, Japan
*
Author to whom correspondence should be addressed.
Received: 6 June 2018 / Revised: 26 June 2018 / Accepted: 27 June 2018 / Published: 30 June 2018
Full-Text   |   PDF [877 KB, uploaded 30 June 2018]   |  

Abstract

Green roofs are considered effective in the reduction of atmospheric CO2 because of their ability to reduce energy consumption of buildings and sequester carbon in plants and substrates. However, green roof system components (substrate, water proofing membrane, etc.) may cause CO2 emissions during their life cycle. Therefore, to assess the CO2-payoff for extensive green roofs, we calculated CO2 payback time it takes their CO2 sequestration and reduction to offset the CO2 emitted during its production process and maintenance practices. The amount of CO2 emitted during the production of a modular green roof system was found to be 25.2 kg-CO2·m−2. The annual CO2 emission from the maintenance of green roofs was 0.33 kg-CO2·m−2·yr−1. Annual CO2 sequestration by three grass species with irrigation treatment was about 2.5 kg-CO2·m−2·yr−1, which was higher than that of Sedum aizoon. In the hypothetical green roofs, annual CO2 reduction due to saved energy was between 1.703 and 1.889 kg-CO2·m−2·yr−1. From these results, we concluded that the CO2 payback time of the extensive green roofs was between 5.8 and 15.9 years, which indicates that extensive green roofs contribute to CO2 reduction within their lifespan. View Full-Text
Keywords: building energy savings; CO2 emission; CO2 payback time; CO2 sequestration; extensive green roof; inventory analysis building energy savings; CO2 emission; CO2 payback time; CO2 sequestration; extensive green roof; inventory analysis
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Kuronuma, T.; Watanabe, H.; Ishihara, T.; Kou, D.; Toushima, K.; Ando, M.; Shindo, S. CO2 Payoff of Extensive Green Roofs with Different Vegetation Species. Sustainability 2018, 10, 2256.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Sustainability EISSN 2071-1050 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top