Yield Regulation in the Knysna Forests
Armin H. W. Seydacka Department of Environment Affairs , Forestry Branch Private Bag X12, Knysna , 6570J. C. van Daalenb South African Forestry Research Institute, Saasveld Forestry Research CentreD. van Dijka Department of Environment Affairs , Forestry Branch Private Bag X12, Knysna , 6570D. Reynella Department of Environment Affairs , Forestry Branch Private Bag X12, Knysna , 6570Henri E. Heynsc Department of Environment Affairs , Forestry Branch Private Bag X537, Humansdorp , 6300A. Joostea Department of Environment Affairs , Forestry Branch Private Bag X12, Knysna , 6570Mike A. Fergusonc Department of Environment Affairs , Forestry Branch Private Bag X537, Humansdorp , 6300W. S. Pitchforda Department of Environment Affairs , Forestry Branch Private Bag X12, Knysna , 6570Graham Durrheima Department of Environment Affairs , Forestry Branch Private Bag X12, Knysna , 6570Dag Willemsc Department of Environment Affairs , Forestry Branch Private Bag X537, Humansdorp , 6300
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SYNOPSIS A yield regulation system for the indigenous forest of the Southern Cape is described. With the system an attempt is made to approach optimum sustainable yield levels, subject to conservation principles. Complexities of forest dynamics and growing stock sampling constraints hamper precise yield regulation in uneven-aged, multi-species forest systems world-wide. The system presented constitutes an endeavour to cope with these constraints adequately within acceptable limits of input in terms of manpower. Aided by an integrated, appropriately designed inventory system, the approach also provides for yield level adjustments over successive harvesting occasions.
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