Abstract
The allometric power relationships of mean tree height H(∝ v θ) and stem volume packing d(∝ v δ) to mean stem volume v were investigated in 182 Chinese pine ( Pinus tabulaeformis Carr.) stands and 56 Prince Rupprecht's larch ( Larix principis-rupprechtii Mayr) stands. According to Weller's allometric model, the slope of the self-thinning boundary line, i.e. −1/[1−(θ+δ)], was calculated from the exponents of the allometric power relationships. The resulting slope was −1.79 for the larch and −1.72 for the pine. The self-thinning boundary lines corresponded well with the combinations of mean stem volume and density in the nine densest stands of pine and larch. The steeper slope for larch was attributed to allocation of more resources to height growth and to greater stem volume in space already occupied in the larch than in the pine, resulting in higher exponent values of θ and δ in the larch than in the pine.
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