Changes in biomass and production over 53 years in a coastal Picea sitchensis - Tsuga heterophylla forest approaching maturity

Using periodic remeasurements of tagged trees in nine 0.4-ha sample plots in a Picea sitchensis (Bong.) Carr. - Tsugaheterophylla (Raf.) Sarg. forest at Cascade Hand Experimental Forest, Oregon, we calculated that biomass of bolewoodincreased from 570 Mg • ha -' at age 85 years to 760 Mg • ha -' at age 138 years. Net primary production of bolewooddeclined from 11 to about 6 Mg • ha -' year - I, and mortality loss increased from 2 to about 6 Mg • ha -' year -
Values for 37-year-old plots in the same area were 210-360 Mg ha -' • year -I bole biomass, 7-20 Mg • ha -1• year -'bolewood production, and 0-2 Mg ha -' • year -' mortality loss. Indications are that bolewood production and biomasswere lower in the older plots when they were 37 years old. In the older plots, biomass did not increase between ages 120and 138. Of the photosynthate potentially available for bolewood production, some replaces biomass lost via mortalityand some is allocated to maintenance (respiration plus allocation to fine roots). We estimate that one-quarter to one-half of the production is lost by mortality, and that mortality loss may thus be an important factor limiting forestbiomass accumulation.