3274 Chapter 27 



The term given in parentheses on the left side of each equation is the percentage 

 correction factor for logarithmic transposal discrepancy. 



Wiant et al. (1977) determined the weight of stemwood and branchwood of 

 West Virginia hardwoods to 16 inches in dbh, including hickory, red maple, 

 yellow-poplar, and five oak species (table 16-12, and 27-86 through 27-89). 



Whole-tree weights of four Mississippi hardwoods are given by equation 1 6- 

 4 with factors from table 16-13; species described are sugarberry, sweetgum, 

 American elm, and green ash. 



Ribe (1973) developed the following equation for predicting the dry weights 

 of red maple stems, leaves, and branches: 



Log 10 Y = Bo + B, (Log 10 x) (27-34) 

 Coefficients for the respective components are as follows: 



Bq Bi R2 



Stem 2.8479 2.6522 9.9930 



Leaves 2.1237 1.8015 0.8520 



Branches 2.3088 1 .9148 0.8960 



The equation is based on 30 sample trees in the Northeast; weight tables were 

 also generated. See species list in table 27-97 for additional information on red 

 maple. 



The Tennessee Valley Authority (1972) provided equations for black oak 

 (table 27-81) and a weight table (table 16-14) for estimating the green or dry 

 weights of the complete tree and various tree components. For 12-inch to 36- 

 inch trees, dry weight ranged from 1 ,873 to 18,965 pounds for the complete tree 

 (includes stump, roots, leaves) and from 8 1 1 to 8, 158 pounds for the merchanta- 

 ble bole. See species list in table 27-97 for additional information on black oak. 



Clark et al. 1980abc and Clark and Schroeder (1977) provided green and 

 ovendry weights of whole trees and stem portions of northern red oak in 

 western North Carolina, scarlet oak from the Tennessee Cumberland Plateau, 

 southern red oak on the Highland Rim in Tennessee, and yellow-poplar from 

 natural unevenaged mountain cove stands in western North Carolina (tables 27- 

 82 through 27-85; tables 16-20 through 16-23 and 16-27). 



For weight data on mockernut hickory and white ash see: Clark, Alexander, 

 III, and W.H. McNab. 1982. Total tree weight tables for mockernut hickory and 

 white ash in north Georgia. Ga. For. Res. Pap. 33. Macon, Ga.: Georgia 

 Forestry Commission, Research Division. 



For a list by species of chapter 16 and chapter 27 weight tables and prediction 

 equations see table 27-97. Data on bark are in chapter 13, roots in chapter 14, 

 and foliage in chapter 15. 



Readers interested in eastern hardwoods should find useful the work of Young 

 (1976) who summarized 62 biomass studies containing regression equations 

 (and in many cases weight tables) relating physical dimensions of trees to the 

 weight of various components, groups of components, or the complete tree. 

 Young's summary includes weight data on root systems, as well as above- 

 ground tree portions. 



Pounds per acre. — Total above-ground biomass on all commercial forest 

 land in the South varies considerably by state. McClure et al. (1981) found that 



