IX, A, 5 



Brown and Mathews: Dipterocarp Forests 



497 



the heavy cutting that has been carried on in the Maquiling 

 forest, has attained a more or less dominant position. Its rate 

 of growth is noticeably slow. Diplodiscus and Dillenia are 

 typical third-class trees and never achieve dominance. Their 

 rates of growth are also slow, but curiously more rapid than that 

 of Celtis and, in the case of Dillenia, much more rapid than 

 that of Parashorea in its younger stages. However, Dillenia is 

 a short-boled tree that never attains great height and which 

 develops a large crown. It is natural, therefore, that the same 

 amount of growth distributed over a short bole should result 

 in a more rapid diameter increment than when distributed over 

 a longer bole as in the case of the dipterocarps. It may be that 

 the results shown by these curves are due to peculiarities of the 

 individual species and are probably not as correct as those for 

 type area B, which are made from a larger number of trees 

 growing in a virgin forest. 



Table XXVII. — Annual diameter growth of trees of Class II. 



Bataan Province, Luzon. 



[Diameter and growth are given in centimeters.] 



Type 



area B. 



Species. 



Diameter class in centimeters. 



Oto5. 



B to 10. 



10 to 20. 



Diam- 

 eter. 



Growth. 



Diam- 

 eter. 



Growth. 



Diam- 

 eter. 



Growth. 



Calophyllum blaneoi (palomaria del 



4.1 

 4.2 



3.8 



0.257 

 0.103 

 0.111 



7.3 

 5.7 

 5.7 

 6.4 

 8.6 

 6.4 

 9.5 

 8.3 

 6.0 

 8.6 



0.248 

 0.055 

 0.1S8 

 0.079 

 0.154 

 0.034 

 0.046 

 0.130 

 0.048 

 0.000 



15.3 

 18.1 

 13.7 

 12.4 

 15.3 

 10.5 

 18.1 



0.266 

 0.277 

 0.407 

 0.1S8 

 0.297 

 0.131 

 0.067 



Do 



Do 



Do. - — 



Do . 







Do - ... - 







Do 







Do 







Santirio, niticta (alupag macsin) 







15.3 

 19.4 

 14.6 



0.016 

 0.071 

 0.067 



Do 







Do.- 













9.5 



0.146 









17.2 

 15.3 

 18.4 



0.166 

 0.206 

 0.146 













Eugenia sp.. . 











Eugenia glaucicalyx (mareeg) 











Do - . 















Eugenia sp. (malaruhat) 







6.4 



0.028 



10.2 



0.099 



















17.5 



0.000 



Total 













0.471 

 0.157 



6 



1.106 

 0.092 

 4.3 



6 



2.354 

 0.157 

 3.7 



Average 





Years in class 



a 



1.8 





