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North Central Research Station
1992 Folwell Ave.
St. Paul, MN 55108

Southern
Research Station

200 W.T. Weaver Blvd,
Asheville, NC 28802
www.srs.fs.usda.gov

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Examples

Dominance probability is the probability that a tree will survive and become a dominant or codominant tree a given number of years after planting or shelterwood removal. For example 0.6 means that 60 percent of the trees will survive and become dominant or codominant trees.

Example Scenario

A forester is regenerating a stand using the shelterwood method.  She would like to have 100 stems of reproduction per acre that are free to grow (dominant) in the new stand 11 years after planting (8 years after the shelterwood overstory removal).  The red oak site index is 62.  The percent stocking for the shelterwood will be 40 - 60%.  She wants to know how many seedlings of what stem caliper she should use to achieve her desired number of trees per acre.  Using OAKUS, she obtains the following results:

No Competion Control
Not Clipped Clipped
Stem Caliper (in.)   0.25 0.5 0.75 0.25 0.5 0.75
Dominance Probability    0.0385 0.191 0.2989 0.0469 0.2248 0.3438
Required Number    2597 524 335 2132 445 291

 

With Competion Control Twice
Not Clipped Clipped
Stem Caliper (in.)   0.25 0.5 0.75 0.25 0.5 0.75
Dominance Probability    0.1321 0.4728 0.6183 0.1576 0.5243 0.6656
Required Number    757 212 162 635 191 150

By selecting larger seedlings and top clipping them,  she can dramatically decrease the number of seedlings needed to achieve her target trees per acre.  Start using OAKUS

 

Example of the relationship of years since planting, seedling caliper and dominance probability for a shelterwood at 40 to 60% stocking with clipped seedlings and a site index of 60 ft.  

How Management Affects Dominance Probabilities

Example of the relationship of years since planting, seedling stem caliper and dominance probability for a shelterwood at 40 to 60 percent stocking with clipped seedlings, and a site index of 60 ft.

W0 - No Competition Treatment
W1 - One Competition Treatment
W2 - Two Competition Treatment

Start using OAKUS

 

 

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 Last Modified: January 6, 2006