Determining the sustainable irregular condition: an analysis of an irregular mixed-species selection stand in Scotland based on recurrent inventories at six-year intervals over 24 years

Andrew Cameron, Lewis Prentice

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Abstract

While there is considerable interest in transforming even aged stands into species-diverse, irregular structures, the rarity of stands close to the end of the transformation process has resulted in a lack of knowledge on optimum target structures that are considered sustainable. This study examined this problem in a mixed-species selection stand that has undergone transformation for over 60 years. Complete inventories of a one hectare permanent sample plot were carried out in 2015 and previously in 2009, 2003 and 1997. The diameter distribution remained relatively static with the q factor remaining at 1.4 since the 2009 inventory. An improvement in number of regenerating seedlings and saplings available for recruitment from previous inventories suggests that the current structure is relatively stable although shade tolerating conifers are gradually dominating the stand. Not all the sustainability criteria were met; however, the stand could be described as having reached a balanced condition. It is recommended that the current stocking density and basal area (~350 stems ha-1 and 26-27 m2ha-1 respectively) should be maintained and that future harvesting interventions should aim to reduce the number of large diameter stems (>55 cm DBH), which represent 14% of the stocking but 48% of the stand basal area.
Original languageEnglish
Pages (from-to)208-214
Number of pages7
JournalForestry
Volume89
Issue number2
Early online date31 Jan 2016
DOIs
Publication statusPublished - Apr 2016

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Scotland
basal area
stem
even-aged stands
stems
stocking density
stand structure
rarity
sapling
saplings
stocking rate
conifers
coniferous tree
shade
sustainability
seedling
seedlings
analysis
sampling
distribution

Keywords

  • irregular silviculture
  • transformation
  • mixed species stand
  • natural regeneration
  • recurrent inventory

Cite this

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title = "Determining the sustainable irregular condition: an analysis of an irregular mixed-species selection stand in Scotland based on recurrent inventories at six-year intervals over 24 years",
abstract = "While there is considerable interest in transforming even aged stands into species-diverse, irregular structures, the rarity of stands close to the end of the transformation process has resulted in a lack of knowledge on optimum target structures that are considered sustainable. This study examined this problem in a mixed-species selection stand that has undergone transformation for over 60 years. Complete inventories of a one hectare permanent sample plot were carried out in 2015 and previously in 2009, 2003 and 1997. The diameter distribution remained relatively static with the q factor remaining at 1.4 since the 2009 inventory. An improvement in number of regenerating seedlings and saplings available for recruitment from previous inventories suggests that the current structure is relatively stable although shade tolerating conifers are gradually dominating the stand. Not all the sustainability criteria were met; however, the stand could be described as having reached a balanced condition. It is recommended that the current stocking density and basal area (~350 stems ha-1 and 26-27 m2ha-1 respectively) should be maintained and that future harvesting interventions should aim to reduce the number of large diameter stems (>55 cm DBH), which represent 14{\%} of the stocking but 48{\%} of the stand basal area.",
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author = "Andrew Cameron and Lewis Prentice",
note = "Funding This study was internally funded by the University of Aberdeen. Acknowledgements The authors wish to thank Mr Charles Taylor and Mr Mark Brazendale of Tay Forest District, Forestry Commission Scotland for their support in carrying out this study.",
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