can be further classified as sound and rotten. 

 Sound culls are those trees which on account of 

 form, crook, extreme limbiness, or other defect of 

 sound trees do not now and in all probability will 

 never produce one usable sawlog at least 12 feet 

 long. Rotten cull trees are (1) sawlog-size trees 

 containing 50 percent or more of their board-foot 

 volume in logs culled because of rot, and (2) trees 

 below sawlog size containing 50 percent or more of 

 their cubic-foot volume in rotten material. Good 

 trees are all others; they are potentially usable saw 

 timber because they either now contain or can be 

 expected eventually to contain material usable as 

 common sawlogs. 



The figures in table 6 reflect the fact that com- 

 mercial logging for the production of industrial 

 lumber, cooperage, and veneer is a selective pro- 

 cess, in which only a part of the trees of sawlog 

 size are cut. This table shows an average of 11.8 

 good trees per acre over 19 inches in diameter in 

 the old-growth uncut condition, and 6.7 trees of 

 the same size in the old-growth partly cut condi- 

 tion. The diff"erence of 5.1 trees in a general way 

 represents the influence of cutting. 



Allowing for the fact that trees on the partly cut 

 areas have grown since the cutting date, com- 



mercial logging probably removes only about 

 half the good trees in and above the 20-inch diam- 

 eter class. Cutting is still more selective in the 

 smaller size classes. In the old-growth uncut 

 condition 12.4 trees per acre are shown in the 14- 

 to 18-inch diameter class, whereas 10.9 trees are 

 found in the old-growth partly cut condition. 



Largely as a result of past fires and logging 

 history in the north-Louisiana delta hardwood 

 stands, cull trees generally make up one-fourth 

 to one-third of the total number of trees in a given 

 stand. Commercial cutting in these stands re- 

 moves some of the good trees of sawlog size but 

 leaves all (or nearly all) the cull trees. In prac- 

 tically all forest conditions, rotten cull trees are 

 more abundant than sound culls in and above the 

 20-inch diameter class, whereas the sound culls are 

 the more common in the smaller sizes. Consider- 

 ing trees of sawlog size only, the second-growth 

 sawlog-size stand has a relatively small proportion 

 of cull trees. 



Commercial Forest 



For further descriptive purposes the total forest 

 area has been subdivided into commercial and 



Table 6. — Average 



number of trees per acre, b 



V forest condit 



ion and diameter-class group 





Forest condition and tree class 



2-4 inches, 

 d. b. h. 



6-12 inches, 

 d. b. h. 



14-18 inches, 

 d. b. h. 



20-28 inches, 

 d. b. h. 



30-38 inches, 

 d. b. h. 



40-1- inches, 

 d. b. h. 



All diame- 

 ters 



Old Rrowth, uncut: 

 Good 



Number 

 53.7 

 47.3 

 2.2 



Number 

 30.8 

 10.0 

 1.3 



Number 

 12.4 

 1.8 

 .6 



Number 

 9.1 

 .6 

 .8 



Number 

 2.2 

 .1 

 .6 



Number 

 0.5 

 (') 



.1 



Number 



108 7 



Sound cull -- 



59.8 



Rotten cull 



5 6 







Total 



103.2 



42.1 



14.8 



10.5 



2.9 



.6 



174.1 



Old growth, partly cut: 



Good 



65.3 



33.7 



1.2 



29.6 

 11.3 

 1.5 



10.9 

 1.9 

 .9 



5.9 

 .7 

 1.1 



.7 

 (') 



.4 



.1 



(') 



.1 



112 5 





47.6 



Rotten cull 



5.2 







Total -- 



100.2 



42.4 



13.7 



7.7 



1.1 



.2 



165.3 







Second growth, sawlog size (uncut): 



Good 



76.2 



38.0 



1.7 



53.7 

 12.1 

 1.8 



17.8 

 1.7 

 .8 



6.6 

 .5 



.7 



.4 

 .1 

 .2 



(>) 

 (') 



.1 



154.7 



Sound cull - - 



52.4 



Rotten cull - -- 



5.3 







Total - — 



115.9 



67.6 



20.3 



7.8 



.7 



.1 



212.4 







Second growth, under sawlog size: 



260.9 



69.7 



1.8 



48.4 

 11.5 

 2.2 



3.4 

 1.5 



. 7 



1.0 

 .4 

 .5 



(.) 



.2 



(') 

 (') 

 (') 



313.9 



Sound cull - 



83.1 



Rotten cull 



5.4 







Total 



332.4 



62. 1 



5.6 



1.9 



.4 



(') 



402.4 



1 Less than 0.1 tree per acre. 



i6 



