Self-thinning lines and allometric relation in Chinese fir (Cunninghamia lanceolata) stands

Journal of Northeast Forestry University - Tập 26 - Trang 281-290 - 2015
Li Xue1, Xiaoli Hou1, Qiujing Li1, Yunting Hao1
1College of Forestry, South China Agricultural University, Guangzhou, People’s Republic of China

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 $$ \overline{M}_{R} $$ .

Tài liệu tham khảo

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