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An empirical function for predicting survival over a wide range of densitiesAuthor(s): William R. Harms
Source: Proceedings of the Second Biennial Southern Silvicultural Research Conference
Publication Series: Scientific Journal (JRNL)
Station: Southern Research Station
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DescriptionA flexible sigmoid function of the form S = 1/[1 + (H/Hc)0], where S is survival expressed as the ratio of number of living trees (N) to the number of trees at stand establishment (Ni), H is mean stand height, Hc is mean height at S = 0.5, and 0 is an exponent defining the shape of the curve, was fit to a set of loblolly pine survival data covering a range of densities from 1000 to 16,000 trees per acre. The equation provided an adequate fit to the data vith r2 values from 0.76 to 0.98. The estimated parameters Hc and 0 were found to be correlated to initial density. Both can be predicted satisfactorily with regressions of the form
Hc = b0Ni b1, and 0 = b0 + bi/Ni.
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CitationHarms, Williams R. 1983. An empirical function for predicting survival over a wide range of densities. Charleston, SC. In: Proceedings of the Second Biennial Southern Silvicultural Research Conference; 1982 November 4-5; Atlanta, GA: p.334-337.
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