Fig. 2.

Relative stem volume production for mixtures and pure stands of Norway spruce and birch from the few simulations which consider the whole rotation, by a Agestam (1985) and b Ekö (1985) for Sweden and c Mielikäinen (1985) for Finland. Relative production (%) is presented in relation to pure spruce stands. Separate simulations are presented for the northern and southern parts of Sweden (a, b) and for different site fertility classes (MAI (m³ ha⁻¹ year⁻¹) for pure spruce and rotation length (years) within brackets). Mielikäinen (1985) also distinguished between birch species