Silvicultural systems Gary Kerr Silviculturist Forest Research What
- Slides: 28
Silvicultural systems Gary Kerr, Silviculturist, Forest Research
What silvicultural system is this…and does it matter? 2 11/24/2020 Silvicultural systems
Structure of Presentation • Silvicultural Systems (including a show by the Llanidloes Players) • Continuous Cover Forestry, Low Impact Silvicultural Systems and ATC • Relevance and application • Take away messages 3 11/24/2020 Silvicultural systems
What are silvicultural systems? ‘A silvicultural system may be defined as the process by which the crops constituting a forest are tended, removed and replaced by new crops, resulting in the production of woods of a distinctive form. ’ (Troup, 1928) 4 11/24/2020 Silvicultural systems
Four components of a silvicultural system • • 5 Regeneration Tending Harvesting [Stands of distinctive form] 11/24/2020 Silvicultural systems
Harvesting Regeneration Tending 6 11/24/2020 Silvicultural systems
Application to a 5 ha forest stand Harvesting Regenerate Tending 7 5 ha felling unit 0. 1 ha felling unit 11/24/2020 Silvicultural systems
Presented by the Llanidloes Players 8 11/24/2020 Silvicultural systems
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Silvicultural systems 13 11/24/2020 Silvicultural systems
What are the main differences between a selection system and a uniform/group/irregular system? 14 11/24/2020 Silvicultural systems
CCF, ATC, LISS and Silvicultural systems • • • 15 Continuous cover forestry Alternatives to clearfelling Low impact silvicultural systems Close-to-nature forestry Dauerwald New forestry Ecosystem management Transformation Uneven-aged silviculture Irregular silviculture 11/24/2020 Silvicultural systems
Many of these terms are used to describe approaches or processes that attempt to integrate the ever increasing range of objectives (economic, environmental, social) into forest management. The main driver is diversity at stand landscape scale. 16 11/24/2020 Silvicultural systems
The Woodland Strategy for Wales uses the term Continuous Cover Forestry • This is an approach to forest management and not a silvicultural system. It has 4 main guiding principles*: • Managing the forest ecosystem • Using natural processes • Working within site limitations • Diversifying stand structure * as described in FCIN 29 17 11/24/2020 Silvicultural systems
Silvicultural systems 18 11/24/2020 Silvicultural systems
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Relevance and application • Stands of distinctive form • When Troup and others classified different silvicultural systems they were mainly based on examination of stands where different systems had been practised for at least 50 years • Consideration of transformation (from evenaged to CCF) is limited… 20 11/24/2020 Silvicultural systems
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In the context of transformation to CCF: • Option 1: deposit the concept of silvicultural systems in the WPB and work with the dynamics of the forest to create: • a simple CCF structure (1 or 2 canopy layers) • a complex CCF structure (3 or more canopy layers) • Option 2: use Silvicultural System as a ‘working hypothesis’ and not a ruling doctrine. 25 11/24/2020 Silvicultural systems
Take away messages • All silvicultural decisions must be driven by management objectives. • Silvicultural systems are a classification of different applications of regeneration-tending-harvesting. • Continuous Cover is an approach to forest management. There is not an exact match with different silvicultural systems. • Silvicultural systems are best used to describe future treatment of long established woodlands. • For transformation to continuous cover, use forest stand dynamics to develop simple or complex structures. 26 11/24/2020 Silvicultural systems
. . the successful application of some silvicultural systems would be impossible at present for two reasons: (i) the derelict state of many woodlands due to faulty treatment and (ii) the country is so infested with rabbits that economic forestry in any form is often difficult if not impossible. (Troup, 1928 [paraphrased]) 27 11/24/2020 Silvicultural systems
Questions and feedback 28 11/24/2020 Silvicultural systems
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Object of silviculture
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Silvicultural system
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