Urban Sustainability: CO2 Uptake by Green Areas in The Historic Centre of Siena

Urban Sustainability: CO2 Uptake by Green Areas in The Historic Centre of Siena

M. Marchi V. Niccolucci R.M. Pulselli N. Marchettini 

Ecodynamics Group - Department of Physical, Earth and Environmental Sciences, University of Siena, Italy

Page: 
407-417
|
DOI: 
https://doi.org/10.2495/DNE-V12-N4-407-417
Received: 
N/A
|
Accepted: 
N/A
|
Published: 
1 January 2018
| Citation

OPEN ACCESS

Abstract: 

Nature provides free assets and ecological services essential for human health and economic activity. For this reason, our ecosystems need to be protected and managed without affecting their integrity in the long run.

The absorption of carbon dioxide (CO2) by vegetation is one of the most important services provided by the ecosystem, which needs to be preserved over time, because it regulates the planetary energy and entropic balance. In the cities, population growth, together with progressive urbanization, often leads towards a reduction of green areas and related ecological systems. Therefore, urbanization processes should be planned, also keeping in mind maintenance of a right equilibrium between built and green areas.

In this study, the green areas in the historic centre of the city of Siena (Tuscany, central Italy) were identified and investigated. It was found that the total surface area of the historic centre was 169.64 ha, of which 71.54 ha was occupied by valleys and other green areas. The real contribution of this natural heritage to the CO2 absorption capacity of the ecosystem, was 330.50 t CO2 yr−1, depending on the vegetation types present in the green areas (e.g. trees, olive groves, vineyards, bamboo, grass and vegetables). Data showed remarkable carbon-storage efficiency untypical of a highly populated urban area(1.95 t CO2 haoverall yr).

In an urban system, the presence of large green areas and their proper management are necessary to ensure its sustainability.

Keywords: 

CO2 uptake, green areas, Siena, urban ecosystem

  References

[1] Tiezzi, E., The End of Time, WIT Press: Southampton, UK, p. 200, 2003.

[2] Jørgensen, S.E., Urgent needs for multidisciplinary and transdisciplinary research. Energy, Ecology and Environment, 1(1), pp. 3–9, 2016.

[3] Tiezzi, E., The Essence of Time, WIT Press: Southampton, UK, p. 123, 2003.

[4] Rockström, J., Steffen, W., Noone, K., Persson, Å., Chapin, F.S., Lambin, E.F., Lenton, T.M., Scheffer, M., Folke, C., Schellnhuber, H.J. & Nykvist, B., A safe operating space for humanity. Nature, 461, pp. 472–475, 2009. https://doi.org/10.1038/461472a

[5] Steffen, W., Richardson, K., Rockström, J., Cornell, S.E., Fetzer, I., Bennett, E.M., Biggs, R., Carpenter, S.R., de Vries, W., de Wit, C.A. & Folke, C., Planetary boundaries: guiding human development on a changing planet. Science, 10.1126/science.1259855, 2015. https://doi.org/10.1126/science.1259855

[6] UN DESA’s Population Division, Web site, available at http://www.un.org/en/development/desa/news/population/world-urbanization-prospects-2014.html, 2014.

[7] Costanza, R., d’Arge, R., De Groot, R., Farber, S., Grasso, M., Hannon, B., Limburg, K., Naeem, S., O’neill, R.V., Paruelo, J. & Raskin, R.G., The value of the world’s ecosystem services and natural capital. Nature, 387, pp. 253–260, 1997. https://doi.org/10.1038/387253a0

[8] MA, Millennium Ecosystem Assessment. Island Press, Washington D.C., USA, available at http://www.maweb.org, 2005. 

[9] ISTAT, Italian Statistical Yearbook. National Institute of Statistics, available at http://www.istat.it, 2016.

[10] Municipality of Siena, Local inhabitants of the historic centre of the municipality of Siena. Institute of Statistics, 2015.

[11] UNESCO, Siena, the Historic Centre, available at http://www.italia.it/en/travel-ideas/unesco-world-heritage-sites/siena-the-historic-center.html, 2016.

[12] Burrough, P.A., Principles of Geographical Information Systems for Land Resource Assessment, Clarendon Press, Oxford, UK, p. 194, 1986.

[13] IPCC, 2006 IPCC Guidelines for National Greenhouse Gas Inventories. Prepared by the National Greenhouse Gas Inventories Program, IGES, Japan, 2006.

[14] Bonciarelli, F., Fondamenti di agronomia generale. Ed. agricole. Bologna, 1999. 

[15] Jo, H.K. & McPherson, E.G., Carbon storage and flux in urban residential greenspace. Journal of Environmental Management, 45, pp. 109–133, 1995. https://doi.org/10.1006/jema.1995.0062

[16] Marchi, M., Pulselli, R.M., Marchettini, N., Pulselli, F.M. & Bastianoni, S., Carbon dioxide sequestration model of a vertical greenery system. Ecological Modelling, 306, pp. 46–56, 2015. https://doi.org/10.1016/j.ecolmodel.2014.08.013

[17] Jende, O., Carbon stocks and ecological implications of open spaces - a case study in Recife - Brazil. Thesis, University of Bonn, p. 153, 2011.

[18] Isagi, Y., Kawahara, T., Kamo, K. & Ito, H., Net production and carbon cycling in a bamboo Phyllostachys pubescens stand. Plant Ecology, 130, pp. 41–52, 1997. https://doi.org/10.1023/A:1009711814070

[19] Li, Y., Zhou, G., Jiang, P., Wu, J. & Lin, L., Carbon accumulation and carbon forms in tissues during the growth of young bamboo. Botanical Review, 77, pp. 278–286, 2011. https://doi.org/10.1007/s12229-011-9069-9

[20] Bastianoni, S., Marchi, M., Caro, D., Casprini, P. & Pulselli, F.M., The connection between 2006 IPCC GHG inventory methodology and ISO 14064-1 certification standard – A reference point for the environmental policies at sub-national scale. Environmental Science & Policy, 44, pp. 97–107, 2014. https://doi.org/10.1016/j.envsci.2014.07.015

[21] REGES Project, Bilancio delle emissioni dei gas ad effetto serra per il territorio della Provincia di Siena, Verifica e Certificazione – Anno 2006-2014. Reports, 2008–2016.

[22] Muñoz-Rojas, M., De la Rosa, D., Zavala, L.M., Jordán, A. & Anaya-Romero, M., Changes in land cover and vegetation carbon stocks in Andalusia, Southern Spain (1956–2007). Science of the Total Environment, 409, pp. 2796–2806, 2011. https://doi.org/10.1016/j.scitotenv.2011.04.009

[23] Nowak, D.J. & Crane, D.E., Carbon storage and sequestration by urban trees in the USA. Environmental Pollution, 116, pp. 381–389, 2002. https://doi.org/10.1016/S0269-7491(01)00214-7

[24] REGES, Disaggregazione a scala comunale del bilancio delle emissioni dei gas ad effetto serra del territorio della Provincia di Siena – Anno 2009, Report, 2011.

[25] Guy, E.D. & Levine, N.S., GIS modeling and analysis of Ohio’s CO2 budget: mitigating CO2 emissions through reforestation. The Ohio Journal of Science, 101(3–4), pp. 34–41, 2001.

[26] Davies, Z.G., Edmondson, J.L., Heinemeyer, A., Jonathan R. Leake, J.R. & Gaston, K.J., Mapping an urban ecosystem service: quantifying above-ground carbon storage at a city-wide scale. Journal of Applied Ecology, 48, pp. 1125–1134, 2011. https://doi.org/10.1111/j.1365-2664.2011.02021.x

[27] Davies, Z.G., Dallimer, M., Edmondson, J.L., Leake, J.R. & Gaston, K.J., Identifying potential sources of variability between vegetation carbon storage estimates for urban areas. Environmental Pollution, 183, pp. 133–142, 2013. https://doi.org/10.1016/j.envpol.2013.06.005