THE SOUTHEKIST CYPRESS. 



43 



Table 10.- 



-Diameter of a 900-year-old cypress at the end of successive 50-year periods 

 (Louisiana). 1 







Time 







Time 



Age. 



Diameter. 



required to 

 grow 1 inch. 



Age. 



Diameter. 



required to 

 growl inch. 



Years. 



Incites. 



Years. 



Years. 



Inches. 



Years. 



50 



6.0 



8.3 



500 



65.8 



8.6 



100 



12.5 



7.7 



550 



72.5 



7.5 



150 



18.5 



8.3 



600 



79.0 



7.7 



200 



25.9 



6.8 



650 



84.2 



9.6 



250 



32.4 



7.7 



700 



87.8 



13.9 



300 



39.4 



7.1 



750 



91.2 



14.7 



350 



46.1 



7.5 



800 



94.1 



17.2 



400 



54.0 



6.3 



850 



98.6 



11.1 



450 



60.0 



8.3 



900 



103.2 



10.9 



! Measurements at breastheight on the stump, inside bark, taken along an average radius, doubled to 

 obtain diameters. Lake Maurepas region, Livingston Parish, La. Total age of tree, 915 years. 



Table 11. — Diameter increase of second-growth cypress in Maryland, based on age. 1 





Diameter breast high. 



Diameter outside bark at 20 feet 

 above ground. 



Age. 















Maximum. 



Average. 



Minimum. 



Maximum. 



Average. 



Minimum. 



Years. 



Inches. 



Inches. 



Inches. 



Inches. 



Inches. 



Inches. 



10 

 20 



5.1 

 10.0 



1.1 

 3.5 



0.4 



1.2 



3.5 



7.8 







2.1 



0.2 



30 



14.2 



6.2 



2.2 



11.2 



4.5 



1.0 



40 



17.6 



8.7 



3.3 



13.8 



6.7 



1.9 



50 



20.5 



11.1 



4.4 



15.6 



8.7 



3.0 



60 



23.2 



13.3 



5.8 



16.9 



10.4 



4.1 



70 



25.8 



15.3 



7.2 



17.9 



12.1 



5.4 



80 



28.6 



17.3 



8.9 



18.9 



13.6 



6.9 



90 



30.8 



19.3 



11.0 



19.8 



15.0 



8.6 



100 



33.3 



21.3 



13.2 



20.6 



16.1 



10.3 



1 Based on decade measurements on 237 stumps of trees 7 to 101 years old. 



Because of the enlarged base of cypress in very wet soils the 

 breast-high diameter (4.5 feet above the ground) is not a good 

 index to the volume of the tree trunk, except after middle life. At 

 the height of about 20 feet (about the top of the first 16-foot log) 

 the character of diameter growth is comparable with that at breast- 

 height of common upland trees and serves well as an index to the 

 contents of the whole tree. 1 Table 11 indicates that a butt log 

 8 inches at the top end 2 can be grown in about 46 years, a 12-inch 

 log in 70 years, and a 16-inch log in 100 years. 



The trees of the virgin forest started, as a rule, under a moderate 

 or light overhead shade, and their growth was therefore slower than 

 than thai of young trees either in natural stands in logged forest 

 areas or in stands thinned under intensive forest management. 



' Diameter in Ide bark, allowing i tncfa for width of bark. 



i r i :. i ui'i c.ii,;f. iii iii/.ni ion iii milling givo overruns i stlmated at :'.'< io in par cent, and 



more in yotmg and deeply mbmerged timber. 



