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3 June 2019 Self-thinning Rules at Chinese Fir (Cunninghamia lanceolata) Plantations—Based on a Permanent Density Trial in Southern China
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Abstract

Data selection and methods for fitting coefficients were considered to test the self-thinning law. The Chinese fir (Cunninghamia lanceolata) in even-aged pure stands with 26 years of observation data were applied to fit Reineke's (1933) empirically derived stand density rule (Nfi01_315.gif–1.605, N = numbers of stems, fi01_315.gif = mean diameter), Yoda's (1963) self-thinning law based on Euclidian geometry (fi02_315.gifN–3/2, fi02_315.gif = tree volume), and West, Brown and Enquist's (1997, 1999) (WBE) fractal geometry (fi03_315.giffi01_315.gif–8/3). OLS, RMA and SFF algorithms provided observed self-thinning exponents with the seven mortality rate intervals (2%–80%, 5%–80%, 10%–80%, 15%–80%, 20%–80%, 25%–80% and 30%–80%), which were tested against the exponents, and expected by the rules considered. Hope for a consistent allometry law that ignores species-specific morphologic allometric and scale differences faded. Exponents α of Nfi01_315.gifα, were significantly different from –1.605 and –2, not expected by Euclidian fractal geometry; exponents β of fi03_315.gifNβ varied around Yoda's self-thinning slope –3/2, but was significantly different from –4/3; exponent γ of fi03_315.giffi01_315.gifγ tended to neither 8/3 nor 3.

Duan Aiguo, Fu Lihua, and Zhang Jianguo "Self-thinning Rules at Chinese Fir (Cunninghamia lanceolata) Plantations—Based on a Permanent Density Trial in Southern China," Journal of Resources and Ecology 10(3), 315-323, (3 June 2019). https://doi.org/10.5814/j.issn.1674-764x.2019.03.010
Received: 9 March 2018; Accepted: 20 November 2018; Published: 3 June 2019
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