Stand Density Management

Question 1

What are some standard rules for tree growth concerning site and density?

Answer 1

Site contols tree height

Density control diameter and crown size

Question 2

What are some characteristics of SD management in normal forests?

Answer 2

• Optimal density per hectare maintained through rotation to maximize growth, yield and quality
• Seedlings planted at high density and thinned regularly to maintain optimal density.

Question 3

When biomass production and density are plotted logarithmically, what relationship is produced?

Answer 3

• The higher the density, the lower the biomass production
• straight line relationship with a slope of -3/2
• AKA law of self thinning

Question 4

What is the SSF?

Answer 4

Stand spacing factor. A method of estimating SBA, best in uniform stands. SSF = avg inter tree distance (cm)/avg DBH.
If avg inter tree spacing is 4m, then it represents 16m2 per tree.

Question 5

How is SBA calculated?

Answer 5

BA of avg tree DBH x SPH

Question 6

How would you obtain your plot multiplier

Answer 6

Square the plot radius and multiply by Pi to get plot area. Divide that into a hectare.

Question 7

How does SBA change as stand matures?

Answer 7

SBA increases as stand matures and levels out as stand reaches maturity to reflect site productivity.

Question 8

What is SBA used to predict?

Answer 8

Volumes and level of infraspecific competition in stands

Question 9

What’s a quick way to get volume per tree if you have basal area?

Answer 9

Ba x .42height

Question 10

How would you get Ba for a tree?

Answer 10

Pi x DBH^2 / 40,000

Question 11

Where would you expect fertilizing to be done?

Answer 11

Medium to poor sites

Question 12

What are some methods of generating additional volume?

Answer 12

• genetic enhancement
• timed fertilization
• target good sites which can support higher density