The differential sensitivity of red pine and quaking aspen to competition
Canadian Journal of Forest Research
Growth of red pind and quaking aspen target trees with varying degrees of competition by neighboring aspen was measured in a 7-year-old clearcut in northeastern Minnesota. Competitive conditions were measured using indices of resouce availability and neighborhood stand density. Three-year diameter growth of target trees was reduced by more than 50% in both species because of competition from neighboring quaking aspen. The last 2 year's height growth was also reduced by approximately 30% for both species. The relationship between growth and percent open sky was convex for red pine and concave for quaking aspen.
Puettmann, Klaus J. and Reich, Peter B., "The differential sensitivity of red pine and quaking aspen to competition" (1995). Aspen Bibliography. Paper 1867.