Reconnaissance Data and Marking Timber 463 



Results of the Study 

 Number of Trees per Acre : 



1. Average number of trees varies from 5-80 per acre. 



2. Average number per acre for 700 acres of 14.8 trees. 



3. About 84% of the stands have 20 trees or less per acre. 



4. Only 16% of the stands have more than 20 trees per acre. 



Density of Stands (based on ideal acre) : 



1. Crown density varies from 0.23 to 0.81. 



2. About 84% of the stands have a density of from 0.23 to 

 0.42, and are therefore only 34 to 3^ stocked. 



3. Only 14% of the stands have a density of 0.55 or about 3^. 



4. Only 2% of the stands have a density of 0.81. 



5. Average crown density of Yellow pine stands is 0.38, and 

 therefore they are less than ^^ stocked. 



Representation of Age Classes : 



1. In our Yellow pine stands from 15-60% of the trees are 

 over 150 years old and over 30" in diameter. The average per- 

 centage of over-mature trees is 31%. 



2. The more open the stand the less the representation of 

 young timber below 20" and the greater the representation of 

 the old trees above 30". 



3. In going from the very open to the very dense stands the 

 percentages increase from 22% to 79% in the case of the young 

 timber and decrease steadily from 60% to 2% in the case of the 

 mature timber. 



4. Our stands do not obey the law of the number-of-trees- 

 per-acre-age curve which shows that the representation in the 

 younger age classes should be much greater than that in the older 

 age classes. 



Contents of Stands and Trees : 



1. The more open the stand the greater the average contents 

 of a tree. 



2. Volume per acre increases with the density of the stand. 



3. The average Yellow pine tree for large areas contains 1,000 

 board feet, is about 28" D.B.H., and contains 5 logs, which would 

 indicate that this timber runs 5 logs per M ft. 



4. From 60-92% of the merchantable timber is over 150 

 years old and over 30" in diameter. 



5. The amount of merchantable timber over 150 years old 

 decreases as the density of the stands increases. 



6. Most of cutting will have to be done in the class that is over 

 150 years old. 



