Diversity in action : How political support was won in Lyon - Grosvenor workshop - Act now - A strategy for urban tree diversity and resilience
←
→
Page content transcription
If your browser does not render page correctly, please read the page content below
Grosvenor workshop Diversity in action : How political support was won in Lyon Act now – A strategy for urban tree diversity and resilience London November 18th 2016 Frédéric SEGUR
The Greater Lyon Authority • 59 municipalities • 1,3 million inhabitants • 100 000 street trees • 50 000 trees in parks
The origin of the urban plantations La Place Bellecour en 1860 Les quais de Neuville vers 1900 Bld de la Croix Rousse en 1880 Le Cours de Verdun vers 1900
Grand Lyon : major genera in 1994 Pterocaryas Paulownias 1% Oaks Catalpas 1% 1% 1% Poplars Other genera* 1% 6% Hackberries 2% Cherry trees 3% Horse Chestnuts Plane trees 3% Maples 52% 13% Black Locusts Lime trees 9% Cutting down of plane trees 7% contaminated by colored canker Fatal accident due to the fall of a tree Street trees health in 1994 Dead or Without tree dangerous 1% 5% good Bad 39% 18% Medium 37%
Greater Lyon Authority’s political commitments in favour of an urban tree strategy 1992 1997 2011 2000 qualitative point of view : •Respect for the charter principle •Implication of various services of the Greater Lyon Authority quantitative point of view : •Doubling of the number of trees between 1990 and 2016 •42 000 100 000 trees •20 000 trees replaced
Transformation of urban landscapes by tree planting Berges du Rhône 2000 … et 2005 Rue Garibaldi vers 1992 … et 2003
The diversification of species strategy Grand Lyon : major genera in 2016 Honey Locusts 2% Elms Plane trees 2% 22% other genera* 21% Horse Chestnuts 2% Maples Hasel trees 11% 2% Lime trees Sophoras 7% 3% Hackberries Pear trees 6% 4% Oaks Ash trees 6% Cherry trees 7% 5% *66 other genera
The impact of climate changes The hypotheses : assessment report of IPCC: www.ipcc.ch
Adaptation strategy to the climate change of Lyon Metropolis Vote prévu au conseil de décembre 2016 1 Protect the water resource 2 Fight against the urban heat island 3 Accompany the populations 4 Adapt the agricultural practices 5 Improve the local knowledge
2 : Fight against the urban heat island 1. How the development of the tree canopy can contribute to refresh the city? The Canopy Plan : Increase the shaded surfaces 12,4% in 2016 22% in 2030 2 Challenges 30% in 2050 2. How to adapt the tree pallets to the evolution of the climate?
Impacts on ecosystems and plants distribution groupe Alpin groupe Subalpin groupe Sapin groupe Chênes groupe Châtaignier groupe Pin maritime groupe Chêne vert Actuel Climat 2095 B2 Anticipate for the choice of species to be planted
Objectives of diversification of tree species London plane, 21% 10% for species Hackberries, 6 % Reachable objective after 2030-2050 Plane genus (6 espèces et variétés), 22% 15% for genus Maples (41 species and cultivars), 11% Reachable objective after 2022-2025 Plane family, 22% 20% for family Rosacées (apple trees, pear trees, cherry trees, …), 11,7%% Reachable objective after 2018 The diversification of species must be reached : • On the scale of the territory • On the scale of the projects
The tree production : links with tree nurseries •Improve the traceability of vegetables produced in tree nursery •Selection of ecotypes •Diversification development Aire naturelle de répartition du sapin de Douglas
The diagnosis of the constraints of the site •Priority in search of the Knowledge of the ecology of tree species ecological optimum •Tree/site adaptation •The diversification Knowledge of the water potential Adaptation of the techniques for the realization of fertile soils Knowledge of the soil potential
Inversion of the criteria for the choice of species « The right tree at the right place » Adaptation to Criteria of Esthetic criteria the constraints of the site(soil, water and climate) > growth (volumetry, root development) > ( Foliage, bloomings, colors…)
Diversify the design of plantations
Communication and acceptance of the projects
Project of renovation of Bellecour Square in Lyon 1992 1997 1998 2000 2012 2010 2007 2006
Actions regarding pedagogy and communication
Thank you for your attention ! The Tree Charter documents can be searched on : http://blogs.grandlyon.com/developpementdurable rubrique « actions/charte de l’arbre » English version available now !!! Frédéric SEGUR La Métropole de Lyon Délégation au développement urbain et au Cadre de Vie Service Arbres et Paysage Tél. (+33) 4 78 95 70 65 fsegur@grandlyon.com
You can also read