Lesson 6 spacer Advanced Options for Growth Intercept
Lesson 1
Lesson 2
Lesson 3
Lesson 4
Lesson 5
Lesson 6

Lesson Objectives

Advanced Options for Using GI Method

Measuring More Than One Sample Tree Per Plot

Estimating SI from Partial Growth

Determining Age by Counting Branch Whorls

Assessing the Reliability of the SI Average

Building a Growth Intercept Table

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

Building a Growth Intercept Table

Figure 6.3 provides a simplified illustration of the procedure used to construct a growth intercept table. The first step is to find appropriate plot locations. Plots are located to cover the geographic and site index range of the species. Sample trees are undamaged, unsuppressed top height trees approximately 60--100 years breast height age. Generally, each plot contains 3 suitable top height trees (Figure 6.3A). The second step is to fall and section the top height trees to exactly determine tree height at known ages (Figure 6.3B). Where possible, sectioning is supplemented with measurement at each annual branch whorl. The third step is to relate measured site index to the top height measured at a given bh age (Figure 6.3C). From these regression equations, a growth intercept table is prepared (Figure 6.3D).

summarize regression equations in a simple table

Figure 6.3. Illustration of the procedure used to construct a growth intercept table: A) find appropriate plot locations; B) section top height trees to re-construct their height growth; C) relate sample tree height to site index at each bh age; D) summarize regression equations in a simple table.


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