Growth and yields of Pinus caribaea in northern Nigeria
Growth and yields of Pinus caribaea in northern Nigeria
J.O. Adegbehin and J.E. Onyibe
ABSTRACT
Trial plantings of exotic tree species commenced in some parts of northern Nigeria over 40years ago Based on data from permanent sample and temporary plots, site index curves and yield tables were constructed for Pinus caribaea. var hondurensis, one of the promising exotics tried. The constructed site index curves revealed five (5) site classes at a reference age of 20 years; viz: I (25.8m); II (23.2m); III (20.5m) IV (17.8m) and V (15.2m). The growth figures derived from the yield classes resulting from the five site index classes revealed that the maximum current annual increment (MCAI) was attained between the ages of 9 7 - 11.3 years with a total volume production (TVP) of between 75 - 263 m /ha (volume over-bark to 7 5cm diameter top) The maximum mean annual increment (MMAI) was attained at age 18 years for all the classes, but with a TVP of about 489 mJ /ha for class I; 387 m3 /ha for class II; 296 mJ /ha for class III; 216 m3 /ha for class IV and 153 m3 /ha for class V. Among other things discussed was the application of the resulting growth figures in the management of the species.
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March 2001
Vol. 51, Iss. 1
