Sustainable stemwood yield in relation to the nitrogen balance of forest plantations: a model analysis
Open Access
- 1 January 1996
- journal article
- Published by Oxford University Press (OUP) in Tree Physiology
- Vol. 16 (1-2) , 173-182
- https://doi.org/10.1093/treephys/16.1-2.173
Abstract
We used an existing analytical model of stemwood growth in relation to nitrogen supply, which we describe in an accompanying paper, to examine the long-term effects of harvesting and fire on tree growth. Our analysis 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, we 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 continued indefinitely. The sustainable yield is 30 m3 ha−1 year−1 with harvesting only, 15 m3 ha−1 year−1 with harvesting and regeneration burning, and 13 m3 ha−1 year−1 with harvesting, fire, leaching and gaseous emissions combined.Keywords
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