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- W1548280355 abstract "Using existing data from untreated research plots, we developed equationsfor predicting 5-yr diameter-growth rate (ΔD₅), 5-yr height-growthrate (ΔH₅), and 5-yr mortality rate (PM₅) for Douglas-fir [Pseudotsugamenziesii (Mirb.) Franco] in the coastal region of the Pacific Northwest.These equations are revisions of the equations constructed in 1995–1997for the Stand Management Cooperative's (SMC) version of the ORGANONgrowth-and-yield model, and they have been developed withsubstantially larger and more comprehensive data sets than were availablein 1995–1997. The new ΔD₅ and ΔH₅ equations were validated with anindependent data set. The PM₅ equation was evaluated by comparing100-yr predictions of Reineke's (1933) stand density index to behaviorpreviously reported from measurements taken on long-term researchplots. The new ΔD₅, ΔH₅, and PM₅ equations appear to be considerablysuperior in predictive ability and behavior to the original equations. The effects of the new equations on stand-level predictions were evaluatedby comparing the maximum mean annual increments (MAI) intotal stem volume (ft³) and associated rotation ages (RA) predicted fromthe original SMC-ORGANON model to predictions from the revisedSMC-ORGANON model. This analysis was done by making 100-yrprojections using 170 plots in young stands from the SMC data sets.Some of the ending values for average crown ratio (CR) after 100 yr ofprojection were near 15%, however, and predictions of basal area (BA)for some of these stands peaked and then declined over stand age. Substitutingthe HCB equation published by Hann and Hanus in 2004 forpredicting crown recession (ΔHCB₅) eliminated the problem with BApeaking over stand age and resulted in somewhat larger average endingCRs. The 100-yr projections were then made again with the 2004 HCBequation of Hann and Hanus. On average, the revised model reduced RAby 2.1 yr (or 4.3%) and maximum MAI by 55.7 ft³/ac/yr (18.9%)." @default.
- W1548280355 created "2016-06-24" @default.
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- W1548280355 date "2006-01-01" @default.
- W1548280355 modified "2023-09-23" @default.
- W1548280355 title "Reanalysis of the SMC-ORGANON equations for diameter-growth rate, height-growth rate, and mortality rate of Douglas-fir" @default.
- W1548280355 hasPublicationYear "2006" @default.
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