cost action e42 « sylviculture of mixed stands species · 2008. 11. 26. · cost action e42...

1

© SHL / 26/11/2008/ Zollikofen / Mh 1

Final International ConferenceCOST Action E4206-08.10.2008 in Freiburg (GE)

« Sylviculture of mixed stands with valuable broadleaved tree

species »Project leader:

Prof. Urs Mühlethaler1

Collaborators:

Christophe Mohni1, Monika Scheidegger1, Nicolas Dericbourg2,

Yves Wiedmer1, Stephan Bernhard1

Collaboration

CPP (Swiss community of poplar and broadleaved tree species)

SEBA (Project to promote rare species in Switzerland)

Financing

State Secretariat for Education and Research SER

1Bern University of Applied Sciences, Swiss College of Agriculture, Zollikofen, Switzerland2Student trainee, student for. ing, ENGREF, France



Overview

• 1. Project framework National and European

• 2. The Swiss project

BackgroundDuration and goalsExpected outputMethod and analysisFirst resultsConclusion

Folie 1

A1 Administrator; 30.09.2008



2



Institute SHL-expertise, Swiss College of Agriculture, Zollikofen, Switzerland

State Secretariat for Education and Research, Switzerland (budget COST)

COST Action E42 « Growing Valuable broadleaved Tree Species »

1. Project frameworkNational and European

• Project realization:

• Financing:

• Collaboration EU:



Heavy economic pressure

High production risks

Required multifunctionality

Current situation in the forestry

sector of Switzerland

Potential

2. The Swiss projectBackground

Mixed stands with valuable

broadleaved tree species

Long-term improvement of the financial situation

To reduce the risks of production

To improve the multifunctionality of

forests

Approach

Know-how of practitioners

Exchange between international scientists

Literature

Suitable site conditions

3



• Main goal:

• Duration:

« Sylviculture of mixed stands with valuable broadleaved tree species »

2. The Swiss projectDuration and goals

To collect, analyse and compare the know-how of experienced practitioners in silviculture of mixed forests with valuable broadleaved tree species and to assure its preservation and transmission through practical guides and excursions.

01.12.2005 to 30.11.2008



PROMOTION

of mixed stands with valuable broadleaved tree species


Exchange between international

scientistsLiterature

Collection, analysis and comparison

Preservation and transmission through practical guides and excursions.


4




Exchange between international

scientistsLiterature

Collection, analysis and comparison

Preservation and transmission through practical guides and excursions


Long-term improvement of the financial situation

Reduction of the risks of production

Improvement of the multifunctionality of

forests



Species

• Fraxinus excelsior• Prunus avium• Acer platanoïdes• Acer pseudoplatanus• Juglans regia• Alnus glutinosa• Quercus petraea• Quercus robur• Sorbus torminalis


5



• Demonstration sheets of the inventoried stands for excursions (practitioners, students)

• Practical guides for the silviculture of valuable broadleaved tree species

Expected outputs2. The Swiss project

1th Part

2nd Part



Expected outputs

Demonstration sheets for excursions

(practitioners, students)

Method

Full inventory

Analysis

Dendrometric and quality analysis of 27

stand

+ =

Method and analysis2. The Swiss project

1th Part

Practical guides 2nd Part

Content analysis with MAXQDA(Software)

Comparison

Episodic interview

+

Literature review

6



First results2. The Swiss project

Demonstration sheets of the inventoried

stands for excursions (practitioners, students)

1th Part



2. The Swiss projectFirst results

1th Part Demonstration sheets of the inventoried


7



2. The Swiss projectFirst results





2. The Swiss project

1th Part

27 demonstration stands

www.cpp-apw.ch

First results

Demonstration sheets of the inventoried


8



+ =

Practical guides


Demonstration sheets for excursions

(practitioners, students)Full inventory

Dendrometric and quality analysis of 27

stand 1th Part

2nd Part

MAXQDA(Text Analysis

Program)

Comparison

Episodic interview

+

Literature review

Method Analysis Expected outputs



2. The Swiss projectMethod and analysis

Explorative method

Episodic interview (Flick 1995)

Questions and topics to discuss

Discussion

and

New research ideas

ANALYSIS I

ANALYSIS II

Practical guides2nd Part

9




Practical guides2nd Part• Examples

– Single tree silviculture is totally actual

– Final crop trees in end or semi distance ?

– Time to choose the final crop trees ?

– Management of companion trees

– How long is it possible to wait before the first intervention in natural regenerated stands ? » Species diversity» Snow damage» Quality

– Time to prune?




Practical guides2nd Part• Every forester practices his “own”

silviculture

There are no general silvicultural principles

• A lot of foresters have their own experimental stands

Increase of the silviculture experience

10



Conclusion2. The Swiss project

Practical guides2nd Part• Very high motivation and know-how of the

26 interviewed foresters

• BUT WE NEED:

• More exchanges between practitioners and researchers

• More exchanges between practitioners

• Demonstration stands as example of good praxis



Thanks for your attention

11



Questions and discussion

Sorbus torminalisThe oldest of the world?Denmark

~225 years~145 DHP






12











13




Practical guides2nd Part• Content analysis (Mayring 2003)

Regeneration and management systemsYoung stage managementPruning and form shapingThinningProblemsHarvestingSalesTips and advices of the forestersJuglans spp.Alnus glutinosaPrunus avium




Practical guides2nd Part• Comparison between the foresters know-

how's

• Literature review

14



2. Le projet suisseAnalyse des entrevues

Génération d’idées, de questions, d’hypothèses sur la thématique des soins modérés

Quelques résultats intéressants sortis des 26 entrevues:

Utilisation des soins modérés dans la pratique

- Plantation en nids à mi-distance ou distance finale- Traitement en cellules à mi-distance ou distance finale- Plantation à mi-distance- Suppression des soins au recrû- Concentration des soins au recrû (40.-/are 20.-/are)

Acquisition d’expérience

- Plusieurs gardes ont leurs surfaces d’essai « personnelles »- Certains pratiquent depuis longtemps- Certains souhaitent acquérir plus d’expérience






Jusqu’à quand peut-on attendre sans intervenir dans un peuplement rajeunit?

- Mélange- Biodiversité- Neige lourde- Intervention négative?

A partir de quand est-il possible de choisir les arbres d’avenir et à quelle distance?

- reconnaissance des critères positifs de sélection des arbres d’avenir- mi-distance vs distance finale?

15






Intervention entre les arbres d’avenir ?

- effet éducateur du peuplement accessoire- revenus intermédiaire (bois de feu, copeaux, etc…)- accès au peuplement pour les soins difficile- rationalisation mécanique (utilisation de récolteuse)- perte de la biodiversité- neige lourde





Résumé

L’intensité et la forme des soins modérés pratiqués par les différents gardes sont très variablesLa thématique est totalement actuelle pour les gardes et les essais fréquents

Points « sensibles »

Réglage et forme du mélange?Quelles mesures de rationalisation pour quels stades de développement?Distance entre les arbres d’avenir?Soins au peuplement accessoire?Biodiversité?Risques?

16





Important

Echange entre les gardes expérience augmenteTempsSurfaces de démonstration Recherche appliquée

cost action e42 « sylviculture of mixed stands species · 2008. 11. 26. · cost action e42...

Documents