Growth and Mortality of Ponderosa Pine Poles Thinned to Various Densities in theBlue Mountains of Oregon

摘要

Growth and mortality in relation to density were investigated for 24 years. Highmortality rates from mountain pine beetle occurred on some plots where values for stand-density index exceeded 140. Periodic annual increments of gross basal area and cubic volume increased curvilinearly with increasing stand density, whereas periodic annual diameter increments decreased curvilinearly with increasing stand density. Mean annual increments of board-foot volume have not culminated at age 84 years.