Relative growth rate of eastern white pine saplings as a function of density in an old growth forest.

Abstract

Intraspecific competition between white pine saplings was investigated in an old growth forest near the University of Michigan Biological Station. This study was conducted to quantify the succession of Eastern white pine saplings (Pinus strobus) by measuring their relative growth rate as a function of density. Multiple plots were laid out to measure density, growth rate, and canopy cover. Our results indicate that the density of white pine saplings is negatively correlated to their growth rate, supporting the intraspecific competition theory. Canopy cover has no observable effect on relative growth rate or density. From this data, it can be inferred that white pine saplings are competing more for space and resources than light, and that this intraspecific competition imposes density-dependent mortality.