A qualitative and quantitative examination of alternative silvicultural regimes in the South Canterbury foothills with reference to the evaluation of climatic factors that may affect these regimes
Thesis DisciplineForestory Science
Degree GrantorUniversity of Canterbury
Degree NameBachelor of Science (Hons)
An investigation into the qualitative and quantitative aspects of alternative silvicultural regimes Pinus radiate (D. Don) was undertaken in the South Canterbury foothills. Data was collected from Geraldine State Forest for carrying out simulations on the Silvicultural Stand model (“SILMOD”), recently developed by the Radiata Pine Task Force. From the simulation, the potential of the various silvicultural regimes were then compared.
In addition to examining the various silvicultural regimes, the effects of wind and snow on trees at Geraldine were also evaluated. Local data on the history of windthrow and snowfall were studied, and a more comprehensive analysis of trial C453 used to evaluate these effects.
These studies indicated that the interim regime, designed to meet the Director-General’s 16.5 cm. D.O.S. criterion, was superior to the former Canterbury foothills regime in terms of both profitability and achievable wood quality. The use of 4 lift pruning also appeared to have considerable potential.
The level of final crop stocking was found to have a significant effect on the profitability levels achieved. Using 200 stems/ha. Gave consistently higher returns than the 300 stems/ha. currently being used in Geraldine State Forest. However, this higher stocking appears to be necessary to prove an ‘insurance’ against loss by windthrow and snow damage within the forest.