Table 1. Distribution of Field Plots by Breast-height Age Class 



and Initial Basal Area Per Acre of Overslory Pine Trees 



(3.0 inches d.b.h. and over) 



Stand Age Basal Area Per Acre (sq. ft.) 



(years) 90-150 151-210 211+ Total 



Number of Plots 



16-35 6 6 3 15 



36-70 4 23 13 40 



71+ 1 7 2 10 



Total 11 36 18 65 



Table 2. Distribution of Field Plots by 10-foot Site-index Classes 



(breast-height age 50) 



Site-index Class Number of Plots 



50 1 



60 33 



70 25 



80 6 



Total 65 



Measurements taken on field plots included: 



1. An initial tally of all overstory trees 3.0 inches diameter breast- 

 height (d.b.h.) and larger by species, crown class, and d.b.h. Trees 

 in the understory that appeared to represent a younger age class 

 than the main stand were excluded. 



2. Initial breast-height age, crown class, total height, diameter outside 

 bark (d.o.b.) and diameter inside Ijark (d.i.b. ) of the bole at 17.3 

 feet above ground for 10 to 20 sample white pine trees per plot. 



3. Remeasurement tallies every 3 years for a total of 9 years after the 

 initial tally. These measurements included diameter breast height 

 for all trees 3.0 inches d.b.h. and larger, and total height for the 

 sample trees. 



4. Soil-site descriptions on each plot including soil drainage classifica- 

 tion, aspect, slope, exposure, and surface rockiness or stoniness. Soil 

 description was based on information obtained from a pit dug in the 

 center of the most representative soil of the plot. The soil type was 

 then identified and each horizon was carefully described as to tex- 

 ture, structure, color, thickness, and presence of gleyed material. 

 Pint samples were taken from each prominent horizon for subse- 

 quent laboratory analysis of texture. No chemical analyses were per- 

 formed. Soil-site descriptions conformed to those outlined in Soil 

 Survey Manual (1951 with supplement issued May 1962). 



