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Book The Effect of Tree and Bundle Size on the Productivity and Costs of Cut to length and Multi stem Harvesting Systems in Eucalyptus Pulpwood

Download or read book The Effect of Tree and Bundle Size on the Productivity and Costs of Cut to length and Multi stem Harvesting Systems in Eucalyptus Pulpwood written by Andrew Mark McEwan and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: There is currently a global increase in Eucalyptus pulpwood plantations. Harvesting systems traditionally utilised in the northern hemisphere are being used in Eucalyptus pulpwood plantations worldwide. However, the small tree size and complexity of debarking Eucalyptus have provided harvesting with productivity and cost challenges not previously experienced in northern-hemisphere conditions. Much research has been invested in these two harvesting methods in northern-hemisphere species and conditions. There is little research available on mechanised processing-machine productivity and costs in Eucalyptus. This investigation aimed to quantify the effect that tree and bundle size has on the productivity of different processing machines in Eucalyptus plantation pulpwood. This was done through regression analysis, whereby productivity models that included tree size and bundle size were constructed. The research also aimed to determine whether or not the multi-stem systems were more cost-effective in smaller tree sizes. The research investigated five mechanised harvesting options that forestry managers could use in Eucalyptus pulpwood plantations. These systems consisted of one CTL system, one full-tree system with single-stem processing and three full-tree systems with multi-stem processing. The CTL system used a harvester to process the trees into logs and to extract them. The full-tree system with single-stem processing used a dangle-head processor (DHP) to process trees into logs. The first full-tree system with multi-stem processing used a chain-flail debrancher debarker (CFDD) to produce debarked and debranched tree lengths, which were slashed into logs. The remaining full-tree, multi-stem systems both produced chips. The first used a chain-flail debrancher debarker chipper (CFDDC) and the second, a CFDD feeding into a stand-alone disc chipper (CFDD & C). The productivity data, measured as m3 per productive machine hour (PMH), was then statistically analysed using regression techniques. Productivity equations were formulated, considering tree size and bundle size, as well as the quadratic functions of these two variables and the interaction between them. Bundle size was only applicable to the multi-stem processing machines. The productivity equations successfully predicted processing-machine productivity, using tree size and bundle size as input variables. Apart from the 0.075 m3 tree size class, the CFDD had the highest overall productivity. The costs of the five systems were then calculated for different tree sizes. No single system was more cost-effective than the others across all tree sizes. In 0.075 m3 trees, the CFDDC system proved the most cost-effective. All systems evidenced high costs in the 0.075 m3 trees, ranging between $19.43 per m3 for the CFDDC system to $28.84 for the harvester system. In 0.40 m3 trees, the cost differences between systems were lower, ranging from .91 per m3 for the DHP system to $11.84 per m3 for the CFDD & C. This study confirms that the CTL system was very expensive to operate in the small tree sizes (0.075 m3). There is a cross-over point at 0.25 m3 per tree, where the CTL system costs become lower than those of the full-tree system. At the 0.40 m3 tree size, the full-tree system is slightly more expensive than the CTL system. Copyright.

Book Mixed Plantations of Eucalyptus and Leguminous Trees Enhance Biomass Production

Download or read book Mixed Plantations of Eucalyptus and Leguminous Trees Enhance Biomass Production written by Dean S. DeBell and published by . This book was released on 1985 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two Eucalyptus species-E. saligna Sm. and E. grandis Hill-are especially favored in Hawaii for wood, fiber, and fuel production because of their quick growth and high yields. Their growth is limited, however, on many sites by low levels of available nitrogen. Supplemental nitrogen can be provided by nitrogen-fixing plants, such as legumes. A test was conducted to determine whether planting two leguminous species-Acacia melaxylon R. Br. and Albizia facataria (L.) Fosberg-could increase biomass production. Results after 65 months suggest that Eucalyptus growth can be increased substantially by planting the species in mixture with leguminous trees. Total biomass production was much greater in the mixed species plantations than in the pure Eucalyptus plantation.

Book Cost of Producing Pulpwood on Farm Woodlands of the Upper Connecticut River Valley

Download or read book Cost of Producing Pulpwood on Farm Woodlands of the Upper Connecticut River Valley written by Victor Sylvan Jensen and published by . This book was released on 1940 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Design of Harvesting Systems and Machines for Use in Pulpwood Stands of the Tennessee Valley as Dictated by Intensive Forest Management

Download or read book The Design of Harvesting Systems and Machines for Use in Pulpwood Stands of the Tennessee Valley as Dictated by Intensive Forest Management written by Thomas A. Walbridge and published by . This book was released on 1960 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Effect of Log Size on the Economics of Sawing Regrowth Eucalypts

Download or read book The Effect of Log Size on the Economics of Sawing Regrowth Eucalypts written by Geoffrey Waugh and published by . This book was released on 1980 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Phase Report on Factors Affecting Pulpwood Production Costs and Technology in the Southeastern United States to American Pulpwood Association

Download or read book Phase Report on Factors Affecting Pulpwood Production Costs and Technology in the Southeastern United States to American Pulpwood Association written by and published by . This book was released on 1961 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Summary Report on a Summary of the Southern Pulpwood Production Research Project to American Pulpwood Association July 1 1963

Download or read book Summary Report on a Summary of the Southern Pulpwood Production Research Project to American Pulpwood Association July 1 1963 written by Henry R. Hamilton and published by . This book was released on 1963 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Effect of Harvesting Intensity on Cost Per Volume

Download or read book Effect of Harvesting Intensity on Cost Per Volume written by Richard A. Kluender and published by . This book was released on 1992 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The effect of organic matter management on the productivity of Eucalyptus globulus stands in Spain and Portugal

Download or read book The effect of organic matter management on the productivity of Eucalyptus globulus stands in Spain and Portugal written by H E J (Helen) Jones and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Sustainable management of forest resources, including nutrient retention and protection of the soil structure, is required to ensure long-term soil fertility and productivity of later rotations. Potential depletion of soil nutrients is particularly likely in production systems based on fast-growing trees, such as eucalypts, We have studied production of second rotation Eucalyptus globulus stands at two sites in northern Spain and two in central Portugal, after replanting or coppicing. Under four treatments, in which plant residues from the first crop were utilised, The residues were either removed from the sites (Treatment R), spread over the soil surface (Treatments S, uniform spreading, and W, in which the woody debris was confined to rows between the trees) or incorporated into the soil by harrowing to 15-cm depth (Treatment I). We measured tree height and girth at intervals over three growing seasons, and root biomass at the Portuguese sites. Decomposition of three residue components: leaves-plus-bark, twigs and branches, was measured in litter bags placed in the position corresponding to the placement of the organic residues. By the end of the experiment, tree height was significantly greater in Treatment I than in Treatment R at both Spanish sites, if planted as seedlings, with intermediate growth in S and W, In Portugal, tree height was smaller in R, though not significantly. DBH showed similar trends, although treatment differences were not significant. Coppiced trees grew faster than seedling trees, but a significant treatment effect on the growth was only observed at the inland Portuguese site, where it was better in Treatment I by the end of the experiment, The residues decomposed significantly faster in I than S or W at the Portuguese sites, but not in Spain. Leaves-plus-bark decomposed faster than twigs, and twigs faster than branches. The results are discussed in relation to recommended management options.

Book Cost Control in Forest Harvesting and Road Construction

Download or read book Cost Control in Forest Harvesting and Road Construction written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 1992 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Miombo in Transition

Download or read book The Miombo in Transition written by Bruce Morgan Campbell and published by CIFOR. This book was released on 1996-01-01 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: Miombo woodlands and their use: overview and key issues. The ecology of miombo woodlands. Population biology of miombo tree. Miombo woodlands in the wider context: macro-economic and inter-sectoral influences. Rural households and miombo woodlands: use, value and management. Trade in woodland products from the miombo region. Managing miombo woodland. Institutional arrangements governing the use and the management of miombo woodlands. Miombo woodlands and rural livelihoods: options and opportunities.