IX, A, 5 



Brown and Mathews: Dipterocarp Forests 



473 



Table XVI. — Annual diameter growth of Parashorea plicata (bagtican la 

 uan) in virgin forest, Mount Maquiling, Laguna Province, Luzon — Contd. 



1 



1 



No. of tree in class. 



Diameter class in centimeters. 



50 to 60. 



60 to 70. 



70 to 80. 1 



^ir Growth. 



^eitr <^--t>'- 



Diam- 

 eter. 



Growth. 



15 











16 





j 







17 



j 



1 







18__.. __ __ 



1 











19 1.. 1 ' 









20 ...1 — 



' 









21 ! 











22 ! 











23 ! 











24 i 













25 - .-■ 



_ 











26.. 











, 27 









' 28""' ... "'""' ■" ! 









1 





( 



Total - 



! f; 107 ! 



?, .•;m 





0.349 





t 

 0.88!5 -J O.fil.-? 





0.349 



Years inclass » j 1] 



.3 



15.3 



28.7 



curves of growth for oak on site I in Europe,^" of yellow pine in 

 northern New Mexico at an altitude of 2,700 meters,^^ and of 

 yellow poplar and white oak in the central hardwood region of 

 Virginia, Kentucky, and Tennessee. It will be seen from the 

 curves that the rate of growth of white oak is faster than that 

 of Parashorea, until the trees are 37.5 centimeters in diameter, 

 while yellow poplar grows faster than Parashorea until it attains 

 a diameter of 65 centimeters. Yellow pine in New Mexico and 

 oak on site I in Europe show rates of groAvth intermediate 

 between white oak and yellow poplar. It is also to be noted 

 that the curve for Parashorea crosses those of all of the temperate 

 zone species and in the larger diameter classes lies considerably 

 above them. This shows clearly that in the latter part of the 

 life of Parashorea it is distinctly the fastest growing of all the 

 species here considered. Yellow poplar, the fastest growing of 

 the temperate zone species, takes one hundred fifteen years to 

 grow from 30 centimeters in diameter to 70 centimeters, while 

 Parashorea makes the same growth in fifty years. The results 

 would seem to show clearly that only the larger individuals of 

 Parashorea are in a position to take advantage of the more 



'* Schlich, W., Schlich's manual of forestry, 3 ed. Bradbury Agnew and 

 Co. Ld., London (1905), 3. 



" From data collected by O. F. Bishop in the Carson National Forest in 

 1911. 



