Structure and yield of cork oak (Quercus suber) stands in southern Spain.
Measurements were made on 21 plots (each 1256 m2) and 427 trees of the factors affecting cork yield and quality: number of trees/ha (N); bark stripping height (HD); bark stripping area (SD); cork yield (PC); PC/m2; cork thickness (CB); stripping intensity (ID); and crown projection area (SPC). The variation in N, basal area (b.a.), SD, PC and ID by girth classes under bark is tabulated. Cork yield can be determined accurately as follows: PC = b.a. × (SD/b.a.) × PC/m2. In even-aged stands, cork yield can be estimated from b.a. as follows: PC = 124.25 + 433.53 b.a., for b.a. ranging from 4.6 to 25.4 m2/ha.