IX, A, S 



Brown and Mathews: Dipteroearp Forests 



523 



Table XLI. — Annual volume growth of 1 hectare of average forest in north- 

 em Laguna. 



[Growth is given in cubic meters.] 



Species. 



Shorea sqtiamata (may pis) 



Skorea teysmanniana (tiaong) . , 

 Shorea polysperma (tanguile) . _ _ 



Dipterocarpits Bp. (apitong) 



Dipierocarpiis Bp. (panao) 



Pentacme eontorta (white lauan) 

 Hopea pierrei (dalindingan isak) 

 MiacellaneouB trees 



Total of all species... 



Diameter class in centimeters. 



30. 35. 40. 50. 



0.0865 

 0.0948 

 0.0157 

 0.0125 

 0.0027 

 0.0055 

 0. 0427 

 0. 1078 



0.3682 



0.0248 

 0.0380 

 0. 0500 



0. 0365 

 0.0807 



0.2300 



0.3361 

 0. 2796 

 0. 0399 

 0.0341 

 0.0055 

 0. 0313 

 0.0993 

 0.2840 



1. 1098 



0.1504 



1.0030 



60. 



0.3299 



0. 1565 



0.3109 



0.2414 



0. 1261 



0.0381 



0.0190 





0.0047 







0.0131 



0.0620 





0.0627 



0.5118 



Species. 



Shorea squamata (mayapis) 



Shorea teysmanniana (tiaong) . . . 



Shorea polysperma (tanguile) 



Dipterocarpus Bv. (apitong) 



Dipterocarpus ep. (panao) 



Pentacme eontorta (white lauan) . 

 Hopea pierrei (dalindingan isak). 

 Miscellaneous trees 



Diameter class in centimeters. 



70. 80. 90. 100. 



Total of all species. 



0.0436 

 0. 1364 

 0. 0667 

 0. 0171 

 0.0086 



0.0322 



0. 0349 

 0. 1364 

 0. 0540 



0. 0195 

 0.0268 



0.0086 



0.3046 



0.2339 0.0463 



0.0195 

 0.0811 



0.1006 



Total. 



1.0123 

 1.2765 

 0. 4984 

 0.0827 

 0.0215 

 0.0501 

 0.2405 

 0. 7178 



3.9082 



which represents the average number of trees per hectare in 

 this forest. The results of these computations are presented in 

 the form of volume growth for each diameter class of each 

 species in Table XLI. The data presented in this table were 

 obtained by multiplying the growth in volume for any species 

 of any particular size by the number of trees of this species and 

 diameter class as given in Table VIII. Where the growth data 

 in Table XL do not extend to diameter classes which appear 

 in the stand table, the growth in diameter for size classes not 

 represented was assumed to be that of the highest diameter class 

 measured for the species in question. One species, Pentacme 

 eontorta (white lauan) , which appears in the stand table, is 

 not represented in our volume growth table. The figures for 

 volume growth of apitong were used in calculating the rate of 

 growth of this species, in as much as the growth figures for 

 apitong and white lauan have been found to be similar in another 

 part of the Islands. Likewise, having no growth figures for 



