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1 Definition of a Silvicultural System 4 The Decision Process Appendix 1 Answer Key
2 Major Types of Systems 5 There's More to Learn Appendix 2 Advantages and Disadvantages
3 Variations of Major Types 6 Implementation Appendix 3 References

Available Options in Different Stand Types

Compare the information in the two stand tables below. All things being equal, and without knowing any further information regarding the site, forest health, etc.; which stand do you feel has more options for stand structural design and silvicultural systems?



Discussion.

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Activity

Stand Table for Stand A


Crown class Speciesa Age 10 year incr. (mm) DBH (cm) Ht. (m) Density BA (m2) Density sph % live crown Ht:Diam. ratio Vigour class

Dominants Sx/Cw 150+ 15 70-100+ 35 15.2 32 30 53 Low-Mod
Codominants Cw/Sw 150+ 12 50-70 30 29.5 156 25 85 Low-Mod
Intermediates Cw/Bl 120 12 25 20 7.5 245 25 98 Low
Layer 2 - poles Cw/Bl 120 <10 10 10 2.0 152 25 105 Low
Layer 3 - saplings Cw/Bl 120 <10 5 6 - 700 - - Low
Layer 4 - regeneration Cw/Bl 75 <10 - 1 - 1467 - - Low


General Stand Description for Stand A


Existing stand structureb Spacial patternc Successional stage Stand development staged Special attributes

Even-aged/ multiple-canopy/ mixed species Mostly uniform with frequent gaps Late seral/ early climax Understorey reinitiation Occasional dead spike tops on Cw.
Consider centre rot in dominant Cw.

a BC Inventory Codes: Cw = western redcedar; Sx = spruce; Bl = subalpine fir; Fdi = interior Douglas-fir; Pli = lodgepole pine.
b These are:
  • even-aged/single canopy/single species,
  • even-aged/single canopy/two species,
  • even-aged/double canopy/mixed species (majority are shade tolerant),
  • even-aged/double canopy/mixed species (majority are shade intolerant),
  • even-aged/multiple canopy/mixed species,
  • uneven-aged/multi-storied.
c Uniform, clumpy, uniform with gaps, etc.
d After Oliver and Larson (1990): stand initiation stage; stem exclusion stage; understorey reinitiation stage; old-growth stage.

Stand Table for Stand B


Crown class Speciesa Age 10 year incr. (mm) DBH (cm) Ht. (m) Density BA (m2) Density sph % live crown Ht:Diam. ratio Vigour class

Dominants Fdi 96 17 45-60 39 19.8 101 40 75 Good
Codominants Fdi/Pli 96 15 40-50 36 15.5 182 30 83 F-Mod
Pl-Poor
Fdi 96 11 15-25 28 12 392 20 140 Poor
Layer 2 - poles Fdi 96 <10 10 13 - 54 10 120 V. poor
Layer 3 - saplings - - - - - - - - - -
Layer 4 - regeneration - - - - - - - - - -


General Stand Description for Stand B


Existing stand structureb Spacial patternc Successional stage Stand development staged Special attributes

Even-aged/ single canopy two species Uniform Early seral Stem exclusion Occasional dead Pli.
Sound/healthy F

a BC Inventory Codes: Cw = western redcedar; Sx = spruce; Bl = subalpine fir; Fdi = interior Douglas-fir; Pli = lodgepole pine.
b These are:
  • even-aged/single canopy/single species,
  • even-aged/single canopy/two species,
  • even-aged/double canopy/mixed species (majority are shade tolerant),
  • even-aged/double canopy/mixed species (majority are shade intolerant),
  • even-aged/multiple canopy/mixed species,
  • uneven-aged/multi-storied.
c Uniform, clumpy, uniform with gaps, etc.
d After Oliver and Larson (1990): stand initiation stage; stem exclusion stage; understorey reinitiation stage; old-growth stage.

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