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The Efficacy of Microclimate Shelters in Improving Seedling Survival in Re-establishment of the Clanwilliam Cedar

Kollin HigginsSouth African Forestry Research Institute, Jonkershoek Forestry Research Centre , Private Bag X5011, Stellenbosch, 7600P. T. MandersSouth African Forestry Research Institute, Jonkershoek Forestry Research Centre , Private Bag X5011, Stellenbosch, 7600A. J. LambSouth African Forestry Research Institute, Jonkershoek Forestry Research Centre , Private Bag X5011, Stellenbosch, 7600
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SYNOPSIS Microclimate shelters were shown to be extremely effective in preventing seedling mortality of the Clanwilliam cedar. Shelters made of white PVC sheeting, corrugated polypropylene and rigid polythene mesh with a transparent polythene covering increased survival rates to between 59 and 72% after the first summer, compared with 4% in the control. No benefit was derived from retaining the shelters for a second summer and prolonged enclosure may predispose seedlings to drought mortality. The use of microclimate shelters could enhance greatly the efficacy of re-establishment programmes.

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