Estimación de volúmenes maderables en plantaciones de Pinus patula en la Cooperativa Atahualpa Jerusalén Granja Porcón, Cajamarca

Abstract

En la región Cajamarca desde los años 70 se han desarrollado diversas investigaciones relacionadas a la introducción y adaptación de especies exóticas, siendo el <em>Pinus patula</em> una de ellas, lo cual motivó el establecimiento de grandes plantaciones o macizos forestales en la Cooperativa Agraria Atahualpa Jerusalén – Granja Porcón. La siguiente investigación tiene como finalidad principal estimar volúmenes maderables de una plantación forestal ubicada en Cerro Campanario de la sierra norte del país. Se instaló un conjunto de parcelas con un muestreo al azar y se ajustaron cuatro volúmenes matemáticos para la estimación volumétrica. Se determinó que los modelos y , presentaron las mejores estimaciones con un coeficiente de correlación ( mínimo de 0.975 y un Error padrón residual ( ) máximo de 0.636; además, se obtuvo que la plantación presentó un volumen total (VT) y comercial (VC) de 718.4397 m<sup>3</sup>ha<sup>-1</sup> y 277.0618 m<sup>3</sup>ha<sup>-1 </sup>respectivamente.

Novel Yield Model of Pinus patula Schltdl. & Cham. Growth near the Ecological Limit in Northwestern Peruvian Andes

“…R 2 ) of the volume, and the error was 10% of the mean. Our results were slightly better than those obtained in previous estimations using inventory values of a 30-year-old P. patula plantation in the Granja Porcón with a thinning treatment of 38% density removed in the 10th year [27]. The inventory-based model used by Villar Cabeza et al [27] explained between 86% and 98% of the volume and presented an error of 13% of the mean.…”

“…Our results were slightly better than those obtained in previous estimations using inventory values of a 30-year-old P. patula plantation in the Granja Porcón with a thinning treatment of 38% density removed in the 10th year [27]. The inventory-based model used by Villar Cabeza et al [27] explained between 86% and 98% of the volume and presented an error of 13% of the mean. Although, the statistics of our volume estimation were slightly worse than the values obtained by an inventory-based model used to fit the data from contemporary natural stands of a P. patula plantation in Hidalgo, Mexico [65].…”

“…The volume increment models, based on inventory data of DBH and height, were significant (p < 0.01) for the three scaling parameters [27,65]. Our model fitted as a function of DBH and TRW, with random weighting parameters, was not significant (p = 0.52) for the scaling parameter associated with TRW.…”

“…Volume and biomass models are usually obtained from field diameter surveys or historical diameter reconstructions using inventories [14,27,34,65]. Tree-ring-based studies have the advantage of offering an annual resolution and long timescale of diameter increment information and, therefore, could be used to produce reference annual basal area, volume, or biomass production estimations (Figures A1-A3; Tables A1 and A2; [29,30,34,37,66]).…”

“…However, this plan was not fulfilled in many of the plots projected for felling [25], and only some permanent plots received continuous monitoring [26]. In addition, forest inventories carried out to adjust the growth models have been poorly developed or are not readily available (but see [14,27]).…”