, The average volume per acre of each principal 

 species group and of the several forest conditions 

 in each type group also give an indication of rela- 

 tive stocking. The volumes for such average acres 

 are shown in table 5 for the turpentine pine type 

 group, as representing a combination of many 

 variations in site, age, and density that occur in 

 the forest stands of this type group in northeastern 

 Florida, and as by far the most extensive type 

 group occurring on two-thirds of the forest area. 

 The board-foot volumes given are net mill tally; 

 that is, allowance has been made for material that 

 would be left in the woods because of rot, fire-scar, 

 crook, limbiness, and similar defects. Also allow- 

 ance has been made for loss at the mill due to 

 sweep and hidden defects. 



Table 5. — Average net volume per acre, by species group and forest 

 condition for the turpentine pine type group 



BOARD-FOOT VOLUME (INTERNATIONAL M-INCH RULE) 





Old growth 



Second growth 





Forest type and species 

 group 



Uncut 



Partly 

 cut 



Sawlog size 



Under 

 sawlog 

 size ' 



Aver- 

 age, all 

 condi- 





Uncut 



Partly 

 cut 



tions a 



Turpentine pine: 



Board 



feet 



4, 108 



1,459 



100 



249 



46 



864 



Board 

 feet 

 706 

 1,497 

 51 

 44 

 34 

 287 



Board 



feet 



811 



1,036 



90 



12 



16 



124 



Board 



feet 



717 



1,058 



133 



56 



19 



188 



Board 



feet 



111 



130 



13 



3 



1 



15 



Board 

 feet 

 461 



Worked 



Nonturpentine pine 



Pulping hardwoods._. .. 

 Nonpulping hardwoods.- 

 Cypress 



508 

 38 

 18 

 9 

 94 



Total 



6,826 



2,619 



2,089 



2,171 



273 



1,128 



CORDWOOD VOLUME (OUTSIDE BARK) OF GOOD TREES 



Turpentine pine: 



Round 



Worked 



Nonturpentine pine 



Pulping hardwoods 



Nonpulping hardwoods.. 

 Cy press 



Total 



Cords 



Cords 



Cords 



Cords 



Cords 



10.9 



2.3 



4.9 



3.6 



2. 1 



3.8 



4.3 



4.5 



4.7 



.9 



.4 



.2 



.3 



.4 



. 1 



2.0 



.7 



.4 



1.0 



. 1 



.5 



2 



.1 



.1 



.0 



3.2 



1.2 



.7 



1.0 



.1 



20.8 



8.9 



10.9 



10.8 



3.3 



Cords 

 2.7 

 2. 1 

 .1 

 .3 

 . 1 

 .4 



1 Does not include areas of reproduction, clear-cut, and fire-killed 

 forest conditions. 



3 Includes areas of reproduction, clear-cut, and fire-killed forest 

 conditions. 



Site Quality 



Within each forest type the rapidity of develop- 

 ment of the stands depends to a large degree on the 

 inherent quality of the site. The relative height 

 growth of the dominant trees is a useful measure of 



site quality. For southern pines, height at 50 years 

 is the customary index in practice. Better sites 

 produce merchantable stands at an earlier-than- 

 average age and have, therefore, a special economic 

 significance. 



The average site index of longleaf pine in north- 

 eastern Florida is 65 feet; of slash pine, 67 feet; and 

 of loblolly pine, 79 feet. Less than 13 percent of the 

 land on which longleaf and slash pines occur quali- 

 fies as site index 80 or better, whereas almost 58 

 percent of the loblolly area is so classified. The 

 poorest sites on which either longleaf or loblolly 

 pines occurred were in the flatwoods. 



Three broad site classes based on the form, height, 

 and general thriftiness of individual trees were used 

 to rate the quality of the hardwood and cypress 

 types. More than 40 percent of the hardwood 

 sites along such larger rivers as the St. Johns and 

 Suwannee were rated "good" and 50 percent 

 "fair." Approximately 75 percent of the upland- 

 hardwood sites are rated fair or good and over 90 

 percent of the scrub oak-scrub hardwood as poor. 

 Most of the cypress grows on fair to good sites with 

 the slowest growth occurring in the poorly drained 

 ponds scattered throughout the flatwoods. 



Reproduction 



The occurrence of reproduction is of greatest 

 economic importance where the mature trees have 

 been removed. In this section young seedlings of 

 longleaf and slash pine and scrub oak occur most 

 frequently. The latter often forms dense stands on 

 cut-over longleaf pine land and retards the develop- 

 ment of young pine. 



About 30 percent of the reproduction area in the 

 longleaf type and more than 35 percent in the slash 

 pine type are stocked at a rate of 900 or more seed- 

 lings per acre; while less than 35 percent of this area 

 in the former type and less than 20 percent in the 

 latter are stocked at 80 to 300 seedlings per acre. 

 The clear-cut area supports less than 80 seedlings 

 per acre, but prospects are fair for 53 percent of it 

 that bears three or more pine seed trees per acre 

 and an additional 30 percent with at least one or 

 two. These trees, assisted by those on adjacent 

 lands, should furnish sufficient seed to reclothe the 

 major portion of these lands with pine seedlings if 

 adequate fire protection is provided. 



15 



