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Position: Home > Articles > Self-thinning lines and allometric relation in Chinese fir (Cunninghamia lanceolata) stands Journal of Forestry Research 2015,26 (2)

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

作  者:
Li Xue;Xiaoli Hou;Qiujing Li;Yunting Ha
单  位:
College of Forestry, South China Agricultural University, Guangzhou, People’s Republic of Chin;College of Forestry, South China Agricultural University, Guangzhou, People’s Republic of China
关键词:
Allometry;Tree mass partitioning patterns;Self-thinning line;Cunninghamia lanceolata;3/4 power and isometric scaling;PINUS-DENSIFLORA SIEB.;DENSITY RELATIONSHIPS;BOUNDARY LINE;ABOVEGROUND BIOMASS;SIZE DISTRIBUTION;LEAF-AREA;COMPETITION;MODEL;TREES;GROWT
摘  要:
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 theta and delta. 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 (, , , and , respectively) showed that and scaled as the 3/4 power of , whereas or scaled isometrically with respect to .

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