| his study was conducted on the western slopes of the Cascade Mountains in Washington, U.S.A. The objectives were to determine the biomass and net primary production (NPP) in a replicated chronosequence of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stands of two different productivity classes. A series of stand age classes (0, 10-, 40-, 70- and 150-year-old) were located in areas classified as site class II (high productivity) and IV (low productivity).;Total tree productivity (NPP) (above- and belowground) ranged from a low of 2.0 Mg ;Total understory biomass (above- and belowground) ranged from 1.4 Mg ;Total tree biomass (above- and belowground) increased with increasing stand age for both site classes; ranging from 4.0 to 900.6 Mg... |
