Lesson 4 spacer BEC Method
Lessons
Lesson 1
Lesson 2
Lesson 3
Lesson 4
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Lesson Objectives

BEC Method

Old Vancouver Forest Region Format

Old Prince Rupert Forest Region Format

Old Nelson Forest Region Format

New Provincial Format for the BEC Method

SIBEC Guide Tables

Relationships Between SI and Soil Moisture, Soil Nutrients, and Biogeoclimatic Subzone

SIBEC Guide Accuracy and Limitations

Accuracy for Site Index of Single Stand

Accuracy for Mean Site Index of Population of Stands

The SIBEC Program

Local SIBEC Tables


Lesson 5
Lesson 6
Lesson 7
Lesson 8
Lesson 9
Lesson 10
Lesson 11
Lesson 12
Appendices
Appendix 1
Appendix 2
Appendix 3
Appendix 4
Appendix 5
Appendix 6
Appendix 7
Appendix 8
Appendix 9
Course Homepage
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Old Nelson Forest Region Format

For each site series, average SI was provided for one shade-intolerant tree species that commonly occurred on the site series (Figure 4.4). Site index was not provided if there was inadequate data. Section 3.6.2 of the Nelson Forest Region eco-guide and footnotes on each table provide more information on the SI estimates.

Exercise:

Given the following information, use the old Nelson Forest Region format for the BEC method to determine SI:

MSdk/01 Fd
MSdk/60% 01 and 40% 04 Fd
MSdk/01 Pl

 

MSdk
Management Interpretations a
Site series Number of plots Common seedling growth limiting factors a, b Relative tree productivity Vegetation potential — common complexes c Road drainage control needs (see cautions a,  d) Common site sensitivities (see cautions a, e) Other prescription considerations
Gross volume productivity Growth class (site index, tree species)
02 3 Dry soil, Cold soil None to Very Low Poorf (15, Fd) Low
- grass
Low H displacement hazard on moderate slopes. No timber values
03 9 Dry soil, Nutrients Low Mediumf (17, Fd) Low
- dry shrub
Mod. H forest floor displacement on all sites; H displacement hazard on moderate slopes. Partial cutting recommended; conserve limited organic matter
04 31 Cold air temp., Cold soil Low Medium (16, Fd) Low
- pinegrass
Mod. H forest floor displacement hazard on all sites; H displacement and mass wasting hazards on steep slopes; H surface erosion hazard on moderate slopes; H compaction hazard on silty soils Conserve limited organic matter; special road construction/maintenance on steep slopes; random machine travel on silty soils when dry or on snowpack
01 52 Cold air temp., Cold soil Med. Medium (19, Fd) Medium
- mixed shrub, fireweed, dry alder
High H compaction hazard on silty soils Random machine travel on silty soils when dry or on snowpack
05 15 Cold air temp., Cold soil, Nutrients (on clay soils) Med. Goodf (23, Fd) Medium
- mixed shrub, fireweed
High H-VH compaction hazard on silty and clayey soils: H forest floor displacement hazard on clayey soils Conserve organic material on clayey soils; random machine travel on clayey soils on snowpack
06 11 Cold air temp., Cold soil Med. Goodf (21, Fd) Medium
-mixed shrub, fireweed
High H compaction hazard on silty soils Windthrow hazard; water table may rise post harvest; random machine travel on silty soils on snowpack; riparian
07 5 Wet soil, Cold soil, Cold air temp. None or Very low No data Medium
- sedge
High H compaction and displacement hazards on organic soils Nonforested fen and bogs; no timber values; riparian
a Caution: Based on sample plot data; some interpretations expected to vary with individual site conditions. Use of original interpretive tools is necessary; these interpretations are presented here to "red flag" common concerns. This table outlines key considerations that should go into management decisions. Rationale and interpretive tools are discussed in Section 3.6.
b These include air temperature, soil temperature, vegetation, soil moisture, and soil nutrients; use of SYTEPREP recommended, see Section 3.6.1.
c Complexes described in Newton and Comeau (1990).
d Caution: This is presented here to "red flag" common drainage needs and is not intended to substitute for site specific engineering interpretations, see Section 3.6.4.
e Caution: Site sensitivity keys must be used with your site data for the PHSP, see Section 3.6.5.
f Sample size less than five plots for site index determination.

Figure 4.4. Old Nelson Forest Region format for BEC method—MSdk.

 

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