Stocks and decay dynamics of above- and belowground coarse woody debris in managed Sitka spruce forests in Ireland

Olajuyigbe, Samuel; Tobin, Brian; Gardiner, Paul A.; Nieuwenhuis, Maarten

doi:10.1016/j.foreco.2011.06.010

Cited by 63 publications

(37 citation statements)

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“…Section 3.1 in this study shows the changes in MC when storage times increased, and section 3.2 shows how low is the contribution of storage costs to the overall supply chain cost under the different scenarios. With a material loss rate of 0.059 kg m-3 year 1 based on Irish studies [40], the overall value losses due to fibre deterioration were minimum with approximately less than 0.5%.…”

Section: Effect Of MC Range On Supply Distributionmentioning

confidence: 99%

“…In addition, woody biomass loss due to storage was assumed to be 0.059 kg/m 3 per year based on studies under Irish conditions [40]. …”

Section: Parameters Of the Modelmentioning

confidence: 99%

“…The model allocated each supply of wood chips to plants along the least-cost paths in terms of travel time, until the demand of each plant is met or the chip source is exhausted. Resource areas are mapped on a national scale and the cumulative and total costs of supply for each plant are calculated [40]. The study suggested that allocation analysis with a network-based GIS is a suitable method to express the costs connected with matching local demand and supply, although allocation in the GIS system does not optimise after overall least costs, which results in a non-optimal supply of plants which have less access to resources [15].…”

Section: Introductionmentioning

confidence: 99%

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Controlling moisture content and truck configurations to model and optimise biomass supply chain logistics in Ireland

et al. 2015

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Highlights A linear programming model that optimises wood biomass supply in Ireland. It uses MC to determine harvesting, chipping, storage and transportation costs. It analyses two supply chain scenarios and two truck configurations. Low wood MC increases supply cost due to longer transport distances. Optimal truck loads can be achieved by controlling wood MC. AbstractIn the coming years, Ireland will continue to face an increasing demand for wood biomass as a renewable source of energy. This will result in strained supply/demand scenarios, which will call for new planning and logistics systems capable of optimizing the efficient use of the biomass resources.In this study, a linear programming tool was developed which includes moisture content (MC) as a driving factor for the cost optimisation of two supply chains that use short wood and whole trees from thinnings as material feedstock. The tool was designed and implemented to analyse the impact of moisture content and truck configurations (5-axle and 6-axle trucks) on supply chain costs and spatial distribution of the supply materials. The results indicate that the inclusion of wood chips from whole trees reduces the costs of wood energy supply in comparison with only producing wood chips from short wood to satisfy the demand, with 9.8% and 10.2% cost reduction when transported with 5-axle and 6-axle trucks, respectively. Constraining the MC of the wood chips delivered to the power plant increases both transport and overall supply chain costs, due, firstly to an increase in the haulage distance and secondly, to the number of counties providing the biomass material. In terms of truck configuration, the use of 6-axle trucks resulted in a 14.8% reduction in the number of truckloads and a 12.3% reduction in haulage costs in comparison to the use of 5-axle trucks across the MC scenarios analysed.

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Section: Effect Of MC Range On Supply Distributionmentioning

confidence: 99%

“…In addition, woody biomass loss due to storage was assumed to be 0.059 kg/m 3 per year based on studies under Irish conditions [40]. …”

Section: Parameters Of the Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Controlling moisture content and truck configurations to model and optimise biomass supply chain logistics in Ireland

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“…An annual interest rate of 4.7% was used for the analysis based in Irish standards for short term projects (less than 10 years) (Department of Public Expenditure and Reform 2013). In addition, a woody biomass loss due to storage was assumed to be 0.059 kg/m 3 per year based on studies under Irish conditions (Olajuyigbe et al 2011). It is assumed that the woodchips produced from these materials are consumed during the same period (month) in which they arrive at the power plants.…”

Section: Parameters Of the Modelmentioning

confidence: 99%

“…Based on wood decay dynamic studies in Ireland (Olajuyigbe et al 2011) found that only 0.01% of the material harvested was lost due to storage. Regarding the added cost from storage, section 3.1 shows that the maximum storage cost in this study accounted for only 3% of the overall supply chain costs.…”

Section: Storagementioning

confidence: 99%

Managing the moisture content of wood biomass for the optimisation of Ireland's transport supply strategy to bioenergy markets and competing industries

Sosa

Acuña

McDonnell

et al. 2015

Energy

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Publication information Energy, 86 : 354-368Publisher Elsevier Item record/more information http://hdl.handle.net/10197/7007 Publisher's statementThis is the author's version of a work that was accepted for publication in Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Energy (VOL 86, ISSUE 2015, (2015  Low wood moisture content increases supply cost due to longer transport distances and/or inclusion of more costly forest products. Optimal truck loads can be achieved by controlling wood moisture content.

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Stump harvesting for bioenergy: A review of climatic and environmental impacts in northern Europe and America

Persson

Egnell²

2018

WIREs Energy & Environment

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Stump harvesting is defined as an intensification of forest management in comparison with stem-only harvesting and removal of tops and branches. It increases soil mixing and the proportion of bare soil. In contrast to earlier hypotheses, stump harvesting was found to reduce emissions of carbon dioxide (CO 2 ), nitrous oxide, and methane in the short term. In the long term, heterotrophic soil CO 2 evolution is reduced. Both model and empirical studies indicate that stump removal can reduce the soil organic carbon (SOC) pool in the short term, but long-term experiments (32-39 years) could not verify any SOC decline. Life cycle assessment studies showed that stumps as fuel resulted in markedly lower emissions of CO 2 into the atmosphere, viewed over a whole forest rotation compared to heating by natural gas and coal. Stump removal does not seem to affect timber production in the next forest rotation and often reduces the infection rate of root rot. It increases the natural regeneration of birch and pine, it can increase nitrate leaching at N-rich sites, and it can increase the number of water-filled cavities where methylmercury is formed. Stump extraction decreases the amount of dwarf shrubs in young clearcuts, but after 1-2 decades, these species are generally recovered. Many species dependent on dead wood are adversely affected by intense stump harvest. Model studies suggest that the risk of species extinction is small when only 10% of the total clear-cut area in the forest landscape is stump harvested, but the risk of extinction rises at increasing extraction intensities.

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Stocks and decay dynamics of above- and belowground coarse woody debris in managed Sitka spruce forests in Ireland

Cited by 63 publications

References 50 publications

Controlling moisture content and truck configurations to model and optimise biomass supply chain logistics in Ireland

Controlling moisture content and truck configurations to model and optimise biomass supply chain logistics in Ireland

Managing the moisture content of wood biomass for the optimisation of Ireland's transport supply strategy to bioenergy markets and competing industries

Stump harvesting for bioenergy: A review of climatic and environmental impacts in northern Europe and America

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