Author Archive

During May CCFG ran a 2 day workshop on Timber Harvesting with Professor Hanns Höefle of Göttingen University. The course, which was held in the beautiful Stourhead Estate, included both seminars and visits to local estates for field demonstrations. Articles and downloads from the course will be available in the ‘Resources’ secion of this website shortly.

CCFG Conference   
CCFG Timber Harvesting Workshop 2010
Presented by Professor Dr. Hanns Höfle

Stourton Village Hall, Wiltshire
12 & 13 May 2010

Overview:

We were fortunate in having Professor Hanns Höfle to run this 2 day workshop which included indoor presentations, and practical field visits to Fontmell Hill Estate, Stourhead Western Estate and Melbury Estate.

Prof. Hanns Höfle holds an MSc and a PhD in Forestry from the University of Freiburg, and a PhD from the Swiss Federal Institute of Technology in Zurich, and the University of Göttingen. In addition to his distinguished academic career he has considerable practical experience which includes managing the central machine shop of the State Forest Service of Lower Saxony and serving as a Forest District Officer. He acted as chairman of the Joint FAO/ECE/ILO Committee on Forest Technology, Management and Training from 1998 to 2004.

Sadly, Professor Hanns Höfle died in June 2014 whilst trekking in the mountains of Georgia. He was an internationally respected forester and will be greatly missed.

Copies of the Prof. Hanns Höfle’s presentations at the workshop can be viewed or downloaded as PDF files below.


Thanks:

We would like to thank Canopy Land Use and Selectfor for arranging this seminar. Our thanks also to Sir John Elliot Gardiner and Nicholas and Henry Hoare for allowing us to use their woodlands for the practical work, and to P.J. Cleary (buyers of Hurley Ash) for their generous support.


Downloads:

File:
Size:
Link:
1. Extraction Racks    
 

Download/view whole file:

     or

Download/view in sections by clicking the links below:

7.46 MB
  • The situation in Germany (pp.2-6)

590 KB
  • The role of silvicultural concepts (pp.8-14)
2.83 MB
  • Reasons for extraction racks: objectives, effect on soils, effect on growth and yield, negative effects (pp.15-37)
1.57 MB
  • Planning, marking and documentation of extraction racks: stand stability, dimension and alignment of ER, what to do with old ones, planning and marking, documentation (pp.38-62)
1.41 MB
  • Use at time of harvesting (pp.63-69)
145 KB
  • Contracts between forest enterprise and contractors (p.70)
36 KB
  • Maintenance and rehabilitation (pp.71-74)
1.08 MB
  • Reducing soil damage during harvesting (pp.75-76)
41 KB
  • Summary (pp.77-79)
49 KB
2. Harvesting Systems
  • Objectives and choice of harvesting systems (pp.2-8)
  • Target diameter harvesting (pp.9-11)
  • Thinning (pp.12-13)
  • Potential harvesting systems: overview (p14)
  • Motor-manual systems, flat terrain & steep terrain (pp.15-44)
  • Contracts between forest enterprise and contractors (p70)
  • Motor-manual systems, flat terrain & steep terrain (pp.15-44)
  • Fully mechanized systems (pp.45-65)
  • What to do with underplanting or advance planting (p.66)
  • Directional felling (pp.68-70)
  • Marking trees (pp.71-74)

 

3.43 MB

 

link

3. Costs
  • General remarks (pp.2-6)
  • Fully mechanized harvesting systems (pp.7-11)
  • Motor-manual harvesting systems (pp.12-14)
  • Skidding (pp.15-18)
  • Other costs (pp.19-21)

 

1.42 MB

 

link


*To download the files, right-click on the above links and choose “Save As” to download.



        


This year 2 special events have been arranged: a 2 day workshop on timber harvesting which will take place in Wiltshire in May, and a visit to Romania in July. In addition we shall have our 3 technical site visits: one in Norfolk, looking at transformation of even aged ash/oak stands to irregular stands; one in the Central Lowlands of Scotland exploring the issues of managing CCF woodlands in semi-urban environments, and there will be a site visit in Wales in October, details to be released. For more information go to the events page.

Transcripts of all the talks given at the Scientific Meeting, ‘Understanding Daylight in the Context of Continuous Cover Forestry’, which was held on 29th September at Westonbirt Arboretum, are now available on our ‘Resources‘ page.

CCFG Cymru held a very successful field meeting at Coed Bryn Arau Duon in Wales attended by over 20 people from all over Britain. Phil Morgan and Huw Denman have managed the forest for 10 years and have gradually changed the even-aged plantation into a stable forest with developing irregular stands. By concentrating their efforts on continuous quality improvement to the infrastructure and to the growing stock they have shown that transformation is an economically viable option which will lead to increasing benefits as the forest matures. Very useful and constructive discussion took place; some devil’s advocates provided a contrast between toilet-paper plantations, to satisfy large scale markets, and quality woodlands managed for integrated multiple benefits. The rationale for cost effective support for transformation from public funds was demonstrated through the work to the forest during the course of the visit. The meeting was attended by woodland owners, managers, timber buyers, students, The Woodland Trust, The Forestry Commission in Wales and Forest Research.

CCFG Conference – 2009

CCFG held a very successful conference attended by over 40 delegates who were presented with valuable information about the properties of light and how light interacts with the other factors affecting the growth of trees; new modelling and surveying techniques point the way ahead with the use of modern technology. The field demonstrations provided a clear demonstration of the variability of light conditions under changing skies due to weather patterns and seasonality and how variation can be contrived and manipulated within different stand structures in forest conditions. The summing-up and conclusions provided the opportunity to identify the need and direction for further research. Phil Morgan, chairman of CCFG said: Science provides us with the necessary arguments to support our assertions that continuous cover forestry is an effective means of managing woodlands in Britain; putting science into practice is our challenge for the future. CCFG gratefully acknowledge the help of Woodland Heritage in supporting the event.

  
Westonbirt Arboretum, Gloucestershire
29 September 2009

Understanding Daylight in the Context of Continuous Cover Forestry

Overview:

Understanding daylight and the manner in which it affects the growth of trees is not a simple matter. The way in which people perceive the subject is often somewhat vague, and knowledge of the basics can be rather patchy. A better understanding of daylight should put us in a better position to understand what is happening in the forest and how our actions might affect this, particularly when aiming for a low impact, CCF regime. Light is one of the basic tools in the manager’s portfolio, and it is perhaps comforting to know that there will always be a need for experienced practitioners, who can interpret what they see on the ground.

This one day seminar was designed to give practitioners a better understanding of daylight and its role in regeneration and the growth of healthy forests, and included an exploration of technologies which are used to measure daylight

In the morning there was a plenary session and in the afternoon there were field demonstrations using equipment provided by Skye Instruments and Delta-T Services.


Transcripts:

File: File Type: Size: Link:
Daylight Conference Programme PDF [93 KB] link
Chairman’s Welcome
PDF
[74 KB] link
Review of the Seminar PDF [365 KB] link

What are the main factors in determining the effectiveness of daylight in woodlands?
Rodney Helliwell (Consultant)

PDF [288 KB] link

Variation in light intensity at different latitudes and seasons, effects of cloud cover, and the amounts of direct and diffuse light
Paul Burgess (Cranfield University)

PDF [901 KB] link

Amounts of light required for photosynthesis, and interaction with other abiotic and biotic factors
Maurizio Mencuccini (Edinburgh University)

PDF [2.5 MB] link

Field assessment and estimation of light under various canopy conditions and in gaps
Mathias Disney (University College, London)

PDF [2.3 MB] link

Results of Field Demonstrations

PDF [68 KB] link

Open Discussion
Chaired by Andy Poore (Consultant)

PDF [146 KB] link

Summing up: review of need for further studies, publications and training
Graham Gill (Forest Enterprise, Kielder)

PDF [97 KB] link

*To download the files, right-click on the above links and choose “Save As” to download.


Sponsors:

We are grateful for the generous support of:



White Fir, Sierra Nevada. Figure from Jupp et al. (2009) Estimating forest LAI profiles and structural parameters using a ground-based laser called Echidna, Tree Physiology 29(2) 171-181 (as shown in Mathias Disney’s talk)