• Ghent, A.W.
  
• Fraser, D.A.
  
• Thomas, J.B.
  

For many years the problems presented by changes in forest composition following major disturbances such as cutting, fire, and insect outbreaks, have commanded the attention of foresters and forest entomologists. It is a common observation that forest stands may change both in stocking and in species composition following such disturbances. These changes are of great theoretical interest since they cast considerable light  on the growth habits and competitive vigor of the various tree species entering the forest succession; they are at the same time of profound economic and social significance since they affect the nature and productivity of future wood using industries in the devastated areas.