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Forestry 1988 61(1):1-22; doi:10.1093/forestry/61.1.1-a
© 1988 by Institute of Chartered Foresters
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Respacing Sitka Spruce

T. J. D. ROLLINSON

Forestry Commission Research Station, Alice Holt Lodge, Farnham Surrey GU10 4LH

An experiment to test the effects of different intensities of respacing on the growth and yield of Sitka spruce was established in an eight-year-old stand. The treatments applied gave final stand densities of between 430 and 3190 stems ha–1. Results are presented for the first full measurement nine years after the respacing treatments were applied. Lower stand density achieved by heavier intensities of respacing resulted in:

i little difference in either mean or top height;

ii an increase in mean diameter and mean tree volume;

iii a loss of total volume and basal area production;

iv an increase in the size and number of branches at 1.8 m;

v an increase in crown width and a decrease in upper and lower crown heights;

vi a decrease in the ratio of top height to mean diameter, that is, an increase in taper.

These results are unsurprising but the relative magnitudes are important and are discussed in relation to the subjects of growth and yield, wood quality, the selection of tree stems and tree stability. The possible use of respacing treatments in practice is discussed briefly.


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