594 



Forestry Quarterly. 



Summary 



The following tabular summary will serve to picture relative 

 conditions of the different forest types as regards habitat and 

 character of vegetation. 



Types. 

 Rainfall . . . 



Lauan. 



lyauan-hagachac. Yacal-lauan. Lauan-apitong. 



.,.i Fairly well dis- Fairly well dis- Fairly well dis- P renounced 

 tributed tributed t ributed dry season. 

 t h r o u g h out t h r o u g hout t h r oughout 

 year; short or year; short or year; short 

 no dry season. no dry season. or no dry 



season. 



Relative humidity. High and fairly Medium during Fairly low for F a i r 1 y low 

 well distribut- short dry sea- short dry t h r oughout 

 ed throughout son; high dur- season; high long dry sea- 

 the year. ing rainy sea- during rainy son. 



son. season. 



Altitudinal 

 range. 



Soil and under- 

 lying rock. 



From near sea Near sea level 

 level to 300 or 

 400 meters.* 



Near sea level. From near sea 

 level to 300 

 or 400 me- 

 ters. 



Medium shallow Usually alluvial; Shallow and Shallow to fair- 



to fairly deep ; 

 rock volcanic; 

 moist; some- 

 times fairly 

 dry. 



deep; alter- 

 natingly very 

 moist and 

 quite dry; 

 u ndergroun d 

 water level 

 near surface. 



fairly dry or 

 very dry 

 V o 1 c a n i 

 rock. 



ly deep; part 

 of year very 

 dry; volcanic 

 rock. 



Topography Slight to 



slopes. 



steep 



Level or nearly Slight to steep Slight to steep 

 level. slopes. slopes. 



Merch a n t a b 1 e 50 to 450 cubic 25 to 200 cubic 50 to 300 cubic 50 to 300 cubic 

 timber per hec- meters.** meters. meters. meters, 



tare. 



C o m p osition of Nearly pure Complex Complex Complex 



dominant s p e- stands of dip- 

 cies. t e r o c a rps to 



complex. 



Canopy of domi- Closed or nearly Open to closed; Medium open; Medium open; 

 nant species. closed; ever- nearly ever- slightly decid- decidedly de- 



green, green. uous. ciduous. 



Profile of forest Fairly regular to Very irregular . . Irregular Irregular 



regular 



Erect palms Abundant Abundant Fairly abundant Almost absent. 



Erect bamboo . . . None or very few None or very few None or very Usually abund- 



few ant. 



Large lianas .... Not abundant . . . Abundant Fairly abundant Fairly abundant 



Composition of Very complex . . . Very complex . . Very complex. . Very complex. 

 smaller trees. 



