In this work a mathematical model is obtained from a sample of 301 Casuarina equisetifolia Forst trees, which permits the determination of the average diameter crown from the normal diameter (d 1. 30). The measurements of 215 trees were used to perform the regression analysis and to validate the selected equation the corresponding measurements of 86 trees were taken. This study was done in the serpentinous savanna of Camagüey province plantations, located in Las Cuabas, Camagüey Silvicultural Unit belonging to Camagüey Forestry Integrated Enterprise. Three mathematical models were compared, being the linear model the most appropriate to perform the average crown diameter estimation. This model results in easy practical management.

RESUMENLos resultados obtenidos en este trabajo se presentan en forma de tablas elaboradas tomando como base los modelos matemáticos definidos a partir de las talas principales de bosques naturales de Pinus tropicalis Morelet mediante el empleo del análisis de regresión, para la cuantificación de la biomasa de copa (follaje y rama) de árboles en pie de la Empresa Forestal Integral Macurije, utilizando un muestreo completamente aleatorio por clases diamétricas. Se tomaron un total de 191 árboles que fueron talados, desramados y desfoliados, procediéndose al pesaje por separado, tanto de la biomasa foliar como de las ramas, de cada árbol, además de medir su diámetro a 1,3 metros del suelo y su longitud total. Palabras clave: biomasa de copa, estimación, modelo matemático ESTIMATION OF CROWN BIOMASS FOR STANDING TREES OF Pinus tropicalis MORELET IN THE FOREST INTEGRATED ENTERPRISE MACURIJE IN THE PINARDEL RÍO PROVINCE, CUBA. ABSTRACTResults offered in this paper are crowns weight tables (foliage and branches) contracted through equations derived from Pinus tropicalis Morelet natural forest using linear regression techniques. Data used were collected using a completely randomised design by diameter classes from 191 felled trees, cut the branches, strip off the leaves and weight them, one at a time. Besides, diameters at 1,3 meter above the ground level and total height were measured.