The characteristics of whole-tree fuel stocks from silvicultural cleanings and thinnings

Juha Nurmi (Corresponding Author), Kari Hillebrand

Research output: Contribution to journalArticleScientificpeer-review

69 Citations (Scopus)

Abstract

The fuel properties of small-sized whole-tree fuel stocks were studied in roadside and in-stand storages. The significance of pile cover, season and storage site on moisture content and heating value of Scots pine (Pinus sylvestris) and pubescent birch (Betula pubescence) fuel stocks were observed.

When the fuel stocks are placed in a well-ventilated location moisture content may be lowered below the 40% mark during one summer period. Covering the piles will give up to 6% units lower moisture content in comparison with non-covered piles. The most benefit is gained from covering during snow melting in spring and the least in midwinter when the snow is dry.

Multi-tree harvested stemwood with no limbs seasoned equally well as the whole trees both in roadside and in-stand trials. This is because the processing of multi-tree bunches caused some debarking to take place. As a result, the transpiration drying capability of whole trees was equalized by the evaporation of moisture via the open wood surface.
Both assortments reached moisture contents below 30% in in-stand conditions during one summer's seasoning.

The effective heating values of neither birch nor pine showed significant changes. However, heating value deviated with the composition of the fuel stock. The presence or absence of crown material was a factor.

The microbial counts of mesophilic fungi in whole-tree fuel stocks were only 1% of that found in logging residues. The counts of thermo-tolerant fungi were still much smaller. Leaving the Scots pine piles uncovered will increase the number of mesophilic fungal spores and bacteria.
Original languageEnglish
Pages (from-to)381-392
JournalBiomass and Bioenergy
Volume31
Issue number6
DOIs
Publication statusPublished - 2007
MoE publication typeA1 Journal article-refereed

Fingerprint

thinning (plants)
cleaning
thinning
Cleaning
Moisture
Piles
moisture content
pile
Betula
Pinus sylvestris
water content
Roadsides
Snow
heating
Fungi
heat
Heating
snow
fungus
Transpiration

Keywords

  • whole trees
  • multi-tree harvesting
  • seasoning
  • moisture content
  • heating value
  • pile cover
  • biomass
  • fuels
  • wood fuels
  • Scots pine
  • pubescent birch
  • birch

Cite this

Nurmi, Juha ; Hillebrand, Kari. / The characteristics of whole-tree fuel stocks from silvicultural cleanings and thinnings. In: Biomass and Bioenergy. 2007 ; Vol. 31, No. 6. pp. 381-392.
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The characteristics of whole-tree fuel stocks from silvicultural cleanings and thinnings. / Nurmi, Juha (Corresponding Author); Hillebrand, Kari.

In: Biomass and Bioenergy, Vol. 31, No. 6, 2007, p. 381-392.

Research output: Contribution to journalArticleScientificpeer-review

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JF - Biomass and Bioenergy

SN - 0961-9534

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