Diversity in action : How political support was won in Lyon - Grosvenor workshop - Act now - A strategy for urban tree diversity and resilience
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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
Une cohabitation difficile au XXème siècle
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
Bld Jean Jaurès - Lyon 7ème …regular renewal of street trees
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 political appropriation of tree plantings
The impact of climate changes
The hypotheses :
assessment report of IPCC:
www.ipcc.chAdaptation 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
knowledge2 : 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 plantedObjectives 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 projectsThe 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 DouglasThe 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 potentialInversion 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.comYou can also read
