Variable Density Yield Tables for Pinus pinaster Ait. in the Central Chain of Mountains

Madrid

1989

45 S.

zahlr. Abb., Tab., 27 Lit. Ang.

Bandaufführung

51796

These yield tables are the result of five inventories made at five years intervals on 34 permanent plots located in the most representative forest of Pinus pinaster Ait. of Avila, Caceres and Madrid provinces. In these tables, productions at different ages, suitable density for each age, suitable rotations, and timber volume produced by the final and the intermediate cuts according to their intensity are exposed for three quality classes defined by the evolution of mean total heights related to age in the 20-100 years interval. Regression equations allowing the calculation of production in the moderate thinning cut regime have been established with results obtained by forest mensurations. The calculations are exposed in three tables according to qualities and they are complemented with figures of: site qualities, curves defining qualities, main crop state (in number of trees, basal area, and volume) before and after the cut, total crop volume and mean annual and current growths. Everything is equally exposed in the case of hard thinningcuts. Finally, in a table and according to qualities, maximum rent rotation lenghts depending on the thinning cut regime are presented and some considerations are made on the most advisable rotation length according to the required products.