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Forestry 1953 26(2):81-95; doi:10.1093/forestry/26.2.81
© 1953 by Institute of Chartered Foresters
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THE GROWTH OF SITKA SPRUCE ON SHALLOW SOILS IN RELATION TO ROOT-DISEASE AND WIND-THROW

W. R. DAY

Department of Forestry, University of Oxford

The paper considers in detail the evidence from the examination of some Sitka spruce (Picea sitcbensis Carr.) 35 to 50 years old, and old enough therefore to begin to reflect the potentialities of the sites occupied which are normally considered suitable for the species. The examination was made to ascertain what factors other than parasitic infestations or infections were acting to cause the thinning of crowns, the death of trees, and the susceptibility to wind-throw. In these shallow soils, factors of fundamental importance are those which determine the regularity of the supply of water and air, and it is considered that where, as in the cases examined, the soils are mainly intractable, early development of disease and of wind-throw will have to be expected.


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