STANDS IN MANGROVE SWAMPS 93 
In Table IV tangal (Ceriops roxburghiana) is the most nu- 
merous species and is represented by the largest volume. Ba- 
kauan (Rhizophora spp.) ranks next to tangal, while busain 
(Bruguiera conjugata) and langarai (Bruguiera parviflora) are 
third and fourth, respectively. The other two species present 
occur in small quantities. In this table the largest percentage 
of volume is the 15-centimeter diameter class. In both Tables III 
and IV the number of individuals is greatest in the smallest 
diameter class and decreases in the larger classes. 
TABLE V.—Stand of firewood 10 centimeters and over in diameter on 3 
hectares, between Basiad and Angas Rivers, Calauag, Luzon. Survey 
applicable to 720 hectares. 
[Data from*report by Ranger Vicente Castillo. ] 




| Species | | 
Species. | Trees. Volume. by eee Reaae 
| trees. es 
ae is wee * = — i 
| cu. Mm. Cords. | Per cent. Per cent. 
DS ea ce ta oh a ee ea ar ee ee | 940 259. 00 103. 60 39.46 | 54.23 
Wan eave ee a or ee EES ee oe ee eee 1, 002 150.52 | 60. 21 42.07, 31.51 
BIBT eee eae ce ee ae es ee ae eee 246 32.63 | 13.05 10.33 | 6. 83 
Raratn ates sa ee akon eke Oe Saeed 105 30. 29 | 12.12 4,41 | 6.34 
Ty yo Thee Md Gr a 82 4.49} 1.79 3.44| 0.94 
het ae Tee ee apne ree ee nee oe ee ee ne 7 | 0.70 | 0. 28 | 0.29 0.15 
ROUGIL 25 ocost cece see cee Soe eceecsessass| 2,382 | 477.63 | 191.05 | 100.00 | 100. 00 
Standiperthectare 9. <= 3 soe Se | 794 159. 21 | 63. 68 | 

NUMBER OF TREES AND VOLUME BY DIAMETER CLASSES IN CENTIMETERS. 

Diameter class in centimeters. 








l | | 
Series 10. | 15. | 20. 25. 
| | Y 
l 
Vol- | | Vol- | Vol- | | Vol- 
| Trees. ie Trees. ume. | Trees. aoe Trees. aie. | 
| ] 
| cu. m | cu. Mm. | cu ™m cu.m 
Pralccersirse. see eet epee te chk 121| 4.90| 176] 19.98|  206| 47.69 209 | 72.73 
Gaara ie ek 485 | 30.64 281 42.53 | 172 | 46.18 59 | 27.91 
1/7120 | a ee ee 104| 5.48 74| 6.97) 32] 5.96 23 | 6.81 
Papatviate ot tte, | de 1| 0.06 2! 1.50| 26! 6.17 52 | 10.14 
Ranwalieoe ess eee de SF 54 1.79 26") ADOT Ree hale ees 2} 0.60 
Papi gine sat ee ets 3 0:09) a4eees2 jose 22 | 4 OfG1s | baeeree (eee 
Wotales Stu eat ee 768 | 42.96 570 | 73.038 | 440 | 106.61 | 345 118.19 





