Title: Some simulation estimates of mean annual increment of Douglas-fir: results, limitations, and implications for management.
Author: Curtis, Robert O.
Source: Res. Pap. PNW-RP-471. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 27 p
Description: Patterns of development of mean annual increment in relation to age predicted by the widely used DFSIM, SPS, TASS, and ORGANON simulators were examined. Although predictions differ considerably among simulators for portions of the range of sites, ages, and treatments, comparisons indicated that (1) culmination is relatively late, (2) the curve is relatively flat in the vicinity of culmination, and (3) systematic thinning tends to delay culmination. Harvest ages of 40 to 50 years reduce volume production relative to potential by amounts ranging from moderate to large according to site, treatment regime, and simulator. Within unknown upper limits, moderate extension of rotations to minimize conflicts among timber production and environmental, aesthetic, and wildlife values would not materially reduce long-term volume production and might increase value production.
Keywords: Growth and yield, mean annual increment, rotation, growth models, Douglas-fir, Pseudotsuga
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Curtis, Robert O. 1994. Some simulation estimates of mean annual increment of Douglas-fir: results, limitations, and implications for management. Res. Pap. PNW-RP-471. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 27 p
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