Diversity in action : How political support was won in Lyon - Grosvenor workshop - Act now - A strategy for urban tree diversity and resilience

Page created by Rick Black
 
CONTINUE READING
Diversity in action : How political support was won in Lyon - Grosvenor workshop - Act now - A strategy for urban tree diversity and resilience
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
Diversity in action : How political support was won in Lyon - Grosvenor workshop - Act now - A strategy for urban tree diversity and resilience
The Greater Lyon Authority
• 59 municipalities
• 1,3 million inhabitants

• 100 000 street trees
• 50 000 trees in parks
Diversity in action : How political support was won in Lyon - Grosvenor workshop - Act now - A strategy for urban tree diversity and resilience
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
Diversity in action : How political support was won in Lyon - Grosvenor workshop - Act now - A strategy for urban tree diversity and resilience
Une cohabitation difficile au XXème siècle
Diversity in action : How political support was won in Lyon - Grosvenor workshop - Act now - A strategy for urban tree diversity and resilience
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%
Diversity in action : How political support was won in Lyon - Grosvenor workshop - Act now - A strategy for urban tree diversity and resilience
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
Diversity in action : How political support was won in Lyon - Grosvenor workshop - Act now - A strategy for urban tree diversity and resilience
Transformation of urban landscapes by tree planting
Berges du Rhône 2000                     … et 2005

          Rue Garibaldi vers 1992           … et 2003
Diversity in action : How political support was won in Lyon - Grosvenor workshop - Act now - A strategy for urban tree diversity and resilience
Bld Jean Jaurès - Lyon 7ème

…regular renewal of street trees
Diversity in action : How political support was won in Lyon - Grosvenor workshop - Act now - A strategy for urban tree diversity and resilience
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
Diversity in action : How political support was won in Lyon - Grosvenor workshop - Act now - A strategy for urban tree diversity and resilience
The political appropriation of tree plantings
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