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Revista de Ciencias Ambientales
On-line version ISSN 2215-3896Print version ISSN 1409-2158
Abstract
CARVAJAL-ARROYO, David; MURILLO-CRUZ, Rafael; GONZALEZ ROJAS, Mariela and FONSECA-GONZALEZ, William. Evaluation of the growth of Cedrela odorata L. in coffee agroforestry systems in Pérez Zeledón, Costa Rica. Ciencias Ambientales [online]. 2021, vol.55, n.1, pp.230-249. ISSN 2215-3896. http://dx.doi.org/10.15359/rca.55-1.11.
(Introduction):
The combination of timber trees with agricultural crops has many advantages at the farm level, especially when the species used have high commercial value.
(Objective):
Evaluate the growth of Spanish cedar (C. odorata) in coffee agroforestry systems using dasometric characterization and allometric models to predict the tree’s total and commercial volume.
(Methodology):
A total of 140 1000 m2 temporary rectangular plots were established with one to 20-year-old cedar trees; in addition, the diameter of tree each at 1.3 m (DBH), total height (Ht), and commercial height (Hc) was measured. A total of 14 models were generated to predict total volume per tree using DBH, age, and height: for the set of ages (1 to 20 years) and ranges (every five years). A commercial volume model was also generated based on DBH and other elements connecting the other variables.
(Results):
The general model predicts a total volume based on DBH with an R2= 0.99, while models by age range obtained an R2 greater than 0.95. The coefficient of determination of the commercial volume model was 0.79.
(Conclusions):
Both the general model and the rank model successfully predict volume; however, the rank model better estimates the total volume between 11 and 16 years of age, while the general model is more recommended for the rest of the ages.
Keywords : Agroforestry; regression; statistical parameters; total-commercial volume models..