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Aspects of the economics of transformation : harvesting productivity, a case study of different intervention types in the conversion of Welsh sitka spruce to continuous cover forestry

Price, Martin Howard (2007) Aspects of the economics of transformation : harvesting productivity, a case study of different intervention types in the conversion of Welsh sitka spruce to continuous cover forestry. PhD thesis, Prifysgol Bangor University.

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APPENDIX 2.1 Trallwm Mensuration base data.xls - Supplemental Material
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APPENDIX 2.2 Destructive sampling and growth calculation protocol.pdf - Supplemental Material
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APPENDIX 2.3 Destructive sampling data.xls - Supplemental Material
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APPENDIX 2.4 DMS Survey Report.pdf - Supplemental Material
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APPENDIX 2.5 DMS Survey Points.xls - Supplemental Material
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APPENDIX 2.6 Rack Mapping Protocol.pdf - Supplemental Material
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APPENDIX 2.7 Rack Node Coordinates.xls - Supplemental Material
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APPENDIX 2.8 ANOVA post-hoc analysis and Normal probability plots (Q-Q).pdf - Supplemental Material
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APPENDIX 2.9 INDIVIDUAL FORM FACTOR CALCULATION.pdf - Supplemental Material
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APPENDIX 2.10 Group plot analysis.pdf
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APPENDIX 2.11 top and dominant height comparison.pdf
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APPENDIX 2.12 TSI HM4.PDF - Supplemental Material
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APPENDIX 2.13 TSI HM5.PDF - Supplemental Material
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Abstract

An increased interest in continuous cover forestry (CCF) and a national policy change in Wales has generated a demand for knowledge of operational productivity in transformation relative to conventional working. This study took place within Coed Trallwm, a privately owned upland woodland in Mid Wales. The site is one of three study sites in Wales used by the UK Forestry Commission to study operational aspects of the transformation to CCF. A total of eight 0.5 ha buffered plots were installed in uniform areas of Sitka spruce (Pice a sitchensis). Treatments consisted of low thinning (paired plot), frame tree (paired plot), group system (paired plot), spatially-moderated creaming (single plot) and premature clearfelling (single plot). Harvesting removed 20% of the standing basal area in the transformation plots and 100% in the clearfell plot. Harvester and forwarder working was recorded through a time and work study in order to identify time differences in cyclical and non-cyclical operations and felling outputs between the different interventions. Relative brash mat production, rack usage and area coverage were also studied. Models for work phase time consumption and total productivity were developed for both machines. Harvester cyclic time consumption was found to be most related to tree size, spacing and morphology, and non-cyclic time consumption to the regularity of the racking system. Forwarder cyclic time consumption was most influenced by thinning type through its effect on assortment, and thinning intensity, through its effect on volume cut. Non-cyclic work was less strongly influenced by these factors. The productivity of both machines increased with mean felled tree diameter. Models for volume recovery, relative product assortments and volumes were also developed for intervention type. Volume recovery, proportion of log material and mean piece size all increased with mean felled tree diameter.

Item Type: Thesis (PhD)
Subjects: Degree Thesis
Departments: College of Natural Sciences > School of Environment, Natural Resources and Geography
Degree Thesis
Date Deposited: 20 Nov 2015 16:24
Last Modified: 27 Jun 2016 15:34
URI: http://e.bangor.ac.uk/id/eprint/5871
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