Conclusions 



The results of this study can he used to advantage in interpreting 

 the site., vohime, and growth of white pine in southern and central New 

 Hampshire. 



The results of the soil-site study indicate that the amount of avail- 

 ahle moisture as measured by drainage class is the most important fac- 

 tor influencing tree growth (Tahle 3). Although the dominant-codomi- 

 nant stand height for some plots ranged up to about 80 feet at a breast- 

 height age of 50 years, predicted heights (or site indices) ranged only 

 from 64 to 71 feet. 



Moderately precise estimates of stand cubic-foot and board-foot 

 volumes per acre can be obtained from measurements of basal area 

 per acre, dominant-codominant stand height, and average Girard form 

 class (Tables 4 and 5). For cubic-foot volume per acre, basal area per 

 acre is based on all trees 3.0 inches d.b.h. and larger and volumes are 

 computed to a 3.0-inch inside-bark top. For board-foot volume per acre, 

 basal area per acre is based on all trees 9.0 inches d.b.h. and larger 

 and volumes are computed to a 6.0-inch inside-bark top. One would 

 need to make an appropriate reduction in poorer quality white-pine 

 stands where utilization would be to larger top diameters. 



Althovigh only fairly precise, estimates of periodic annual cubic 

 foot and board foot volume growth and mortality (Tables 6 through 

 10) are useful for management planning. Since trees on all study plots 

 were well-spaced, some appropriate reduction in cubic-foot and board- 

 foot growth is needed to allow for openings in natural stands. In addi- 

 tion, sawtimber utilization was computed to a 6.0-inch top inside bark. 

 Just as for the stand volume table, one would need to make an appro- 

 priate reduction in growth in poorer quality white pine stands where 

 utilization would be to a larger top diameter. 



The equations and tables indicate moderately fast periodic annual 

 growth rates. However, the establishment period for white pine is rela- 

 tively long (when compared with southern pines). Thus, mean annual 

 growth is considerably lower than periodic annual growth. Growth 

 equations can best be utilized together with "Yields of Eastern White 

 Pine in New England Related to Age, Site, and Stocking" by Leak 

 et al. (1970) in making decisions on the management of white pine. 



25 



