Dynamics of even-aged Nothofagus truncata and N. fusca stands in north

Untended, fully stocked, even-aged stands of Nothofagus truncata (Col.) Ckn. (hard beech) or N. fusca (Hook, f.) Oerst. (red beech) of natural and cultural origin and ranging in age from 20 to 100 years, were sampled using temporary and permanent plots on a range of sites in North Westland, South Island, New Zealand. Changes in stand parameters with age were quantified in order to assess growth of these stands, and thus gain some insight into their silvicultural potential. Stands of each species followed a similar pattern of growth, with rapid early height and basal area increment. Mean top height reached a maximum of c. 27 m by age 100 years. Basal area reached an equilibrium of c. 41 m2/ha in N. truncata and 46 m2/ha in N. fusca as early as age 30 years. Nothofagus truncata stands had, on average, a somewhat lower mean diameter at any given age than N. fusca stands, and maintained higher stockings. Both species attained similar maximum volume of c. 460 m3/ha at age 100 years