Self-thinning lines and allometric relation in Chinese fir (Cunninghamia lanceolata) stands
Tóm tắt
We calculated a self-thinning exponent of 1.05 for tree mass using the 3/2 power equation in 93 Cunninghamia lanceolata plots. According to Weller’s allometric model, the self-thinning exponent for tree mass was calculated as 1.28 from the allometric exponents θ and δ. The both self-thinning exponents were significantly lower than 3/2. The self-thinning exponent of organs was estimated to be 1.42 for stems, 0.93 for branches, 0.96 for leaves, 1.35 for roots and 1.28 for shoots, respectively. The self-thinning exponent of stem mass was not significantly different from 3/2, whereas thinning exponents of trees, branches, leaves and roots were significantly lower than 3/2. The stand leaf mass and stand branch mass were constant regardless of the stand density. The scaling relations among branch, leaf, stem, root and shoot mass (
$$ \overline{M}_{B} $$
,
$$ \overline{M}_{L} $$
,
$$ \overline{M}_{S} $$
,
$$ \overline{M}_{R} $$
and
$$ \overline{M}_{A} $$
, respectively) showed that
$$ \overline{M}_{B} $$
and
$$ \overline{M}_{L} $$
scaled as the 3/4 power of
$$ \overline{M}_{S} $$
, whereas
$$ \overline{M}_{S} $$
or
$$ \overline{M}_{A} $$
scaled isometrically with respect to
$$ \overline{M}_{R} $$
.
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