SUSTAINABLE STEMWOOD YIELD IN RELATION TO THE NITROGEN-BALANCE OF FOREST PLANTATIONS - A MODEL ANALYSIS

We used an existing analytical model of stemwood growth in relation to nitrogen supply, which we describe in an accompanying paper, to exami ne the long-term effects of harvesting and fire on tree growth. Our an alysis takes into account the balance between nitrogen additions from deposition, fixation, and fertilizer applications, and nitrogen losses from stemwood harvesting, regeneration burning, leaching and gaseous emissions. Using a plausible set of parameter values for Eucalyptus, w e conclude that nitrogen loss through fire is the main factor limiting sustainable yield, defined as the maximum mean annual stemwood volume increment obtained in the steady state, if management practices are c ontinued indefinitely. The sustainable yield is 30 m(3) ha(-1) year(-1 ) with harvesting only, 15 m(3) ha(-1) year(-1) with harvesting and re generation burning, and 13 m(3) ha(-1) year(-1) with harvesting, fire, leaching and gaseous emissions combined. Our approach uses a simple g raphical analysis that provides a useful framework for examining the f actors affecting sustainable yield. The graphical analysis is also use ful for extending the application of the present model to the effects of climate change on sustainable yield, or for interpreting the behavi or of other models of sustainable forest growth.