Figure 29. — Comparison of net increment and com- 

 modity drain for sawlog limber and all trees, 

 1937. 



Sawlog timber: 

 Net increment 



Commodity droin 



AM trees: 



Net Increment 



Commodity drain 













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1 , 



1 1 





0.5 



10 1.5 20 

 Billion boord feet 



2.5 



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2 3 4 5 



Million cords 



6 



7 



and cooperage stock accounted for 14 percent. Only 4 per- 

 cent of the saw-timber material cut was converted into pulp. 

 A large volume of the timber cut is too small for saw- 

 logs. Including this nonsawlog material, the total timber 

 cut of 1937 amounted to 6.3 million cords, or 467 million 

 cubic feet. The distribution ot this commodity drain 

 among the principal commodities is as tollows: 



Percent 



Lumber 54 



Fuel 19 



Cross ties 7 



Pulpwood 6 



Land clearing 5 



Cooperage 3 



Veneer 2 



Other 4 



Total 1()0 



Nearly 80 percent of the total commodity drain consisted 

 of material suitable tor sawlogs, 14 percent was from under- 



T.^BLE 14. — Distribiitio)] oj commodity drain, by class oj 

 material and siircex unit, /V~ 



Survey unit 



Commod- 

 ity 

 drain 



Saw lop 

 material 



Small 

 trees 



Woods 

 waste ' 



N"orth delta 



South delta 



North pine 



Southwest pine V 



Million 

 ciit)ic feet 

 60.2 

 82.3 

 151.0 

 164.4 



Percent 

 SI 

 81 

 74 

 81 



Percent 

 19 

 18 

 16 



s 



Percent 



(') 



1 



10 



11 



All iinii>. 



4(M\ 



79 



1 1 



- 



' Pine tops and linilis. 



' I/ess than 0..") percent. 



' Includes data for southeik^t pine nnil. 



sawlog-sizc trees, and the remainder consisteil ot upper 

 stems ot pine trees, most ot which were abaniloned as woods 

 waste. The distribution of this material among the survey 

 units is shown in table 14 and figure 28. 



Of the total drain ot saw timber from Louisiana forests in 

 1937, more than 17 percent was mortality loss; that is, one- 

 fifth as much saw timber was lost by death as was cut for 

 use (fig. 29). Since by far the most important cause of 

 mortality is fire, mortality loss could be reduced greatly 

 by more effective protection from forest fires. Improved 

 forest-management practices and more intensive utilization 

 would help to serve the same purpose. 



Com pan son of Ket Increment und Commoihfy 

 D?-ciin 



In 1937, a peak vear ot lumber production in Lx)uisiana, 

 the total commodity drain from saw-timber material was 

 more than 2.3 billion board feet and the total net increment, 

 after deduction for mortality, was 1.9 billion. This 

 means that during the vear the total stock ot sawlog mate- 



includKl in soulhwtsi pmt 



FluuKE 30. — Excess incrrmrnl <tW excess drmim in smv . 

 surrey units, 19j7. 



33 



