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

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
Appendix 1
Appendix 2
Appendix 3
Appendix 4
Appendix 5
Appendix 6
Appendix 7
Appendix 8
Appendix 9
Course Homepage

New Provincial Format for the BEC Method

In the fall of 1997, the B.C. Ministry of Forests released the document “Site index estimates by site series for coniferous tree species in British Columbia.” This book is known as the SIBEC guide (Site Index—Biogeoclimatic Ecosystem Classification). The SIBEC guide provides BEC method estimates of SI for many of the common species-site series combinations in the province. The SIBEC guide replaces the BEC method SI estimates in the Vancouver, Prince Rupert, and Nelson eco-guides.

In addition to tables of average SI by species, site series, and forest region, the SIBEC guide includes a discussion of:

  1. the relationships between SI and soil moisture, soil nutrients, and biogeoclimatic subzone;
  2. the accuracy that can be expected from the BEC method and its limitations; and
  3. the overall SIBEC program.

SIBEC Guide Tables

Figures 4.5 to 4.7 provide examples of the SIBEC guide tables. When these tables are compared to the previous examples of the old BEC method formats from the Nelson, Vancouver, and Prince Rupert forest regions, it is clear that the new SIBEC guide:

  1. provides site index estimates for more species—site series combinations;
  2. indicates the reliability of the SI estimates;
  3. includes footnotes by the regional ecologists to supplement the tables;
  4. provides greater resolution and clarity than the Prince Rupert and Vancouver forest region formats; and
  5. provides site index as a class midpoint with 4 m classes in the CDF, CWH, and MH zones and 3 m classes in all other zones.

Thumbnail of Vancouver CWHdm SIBEC table

Figure 4.5. New province-wide format for BEC method— Vancouver Forest Region—CWHdm (click on the above thumbnail to see a full screen version of the table).

Thumbnail of Prince Rupert CWHwm SIBEC table

Figure 4.6. New province-wide format for BEC method—Prince Rupert Forest Region—CWHwm (click on the above thumbnail to see a full screen version of the table).

Thumbnail of Nelson MSdk SIBEC table

Figure 4.7. New province-wide format for BEC method—Nelson Forest Region—MSdk (click on the above thumbnail to see a full screen version of the table).


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