Maximum Stand-Density Index of 40 Western Hemlock-Sitka Spruce Stands in Southeast Alaska
2007
Poage, N.J. | Marshall, D.D. | McClellan, M.H.
Reineke's (1933) maximum stand-density index (SDI(max)) was determined for 40 unthinned, fully stocked, even-aged, hemlock-spruce stands in southeast Alaska. A nonlinear model was used to identify objectively the linear portions of the stands' self-thinning trajectories for analysis. The objectives of the present study were (1) to use the modeled slopes and intercepts to determine the mean SDI(max) of the stands and (2) to identify stand and site factors associated with the variability observed in SDI(max). The mean SDI(max) of the 40 hemlock-spruce stands in southeast Alaska was 619. Individually, none of the stand or site factors examined accounted for >30% of the variability observed in SDI(max) when all 40 stands were analyzed together. Although the spruce proportion of total stand basal area of most stands increased over time and the hemlock proportion of total stand basal area of most stands decreased over time, SDI(max) was not related to species proportion or changes in species proportion over time.
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