Significance of Topographic Gradient in Stem Diameter - Height Allometry for Precise Biomass Estimation of a Tropical Moist Forest in the Central Amazon
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概要
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We developed a <I>stem diameter</I> <I>D-height</I> H allometric model that included variability in the <I>D-H</I> relationship along a topographic gradient. The study site was located along a belt transect (2500 × 20 m) established in a primary tropical forest near Manaus, Brazil. The transect included typical topography of the region, characterized by plateaus and valleys called "<I>baixios</I>". The <I>D-H</I> allometric model (<I>n</I> = 1307) indicated that potential tree height increased significantly, from 28 m at the lowest <I>baixio</I> plot to 35 m at the highest plateau plot. Consequently, by combining the <I>D-H</I> allometric model and an allometric equation with the variable <I>D</I><SUP>2</SUP><I>H</I>, biomass was estimated for trees (<I>D</I> > 10 cm) in each sub-plot (20 × 20 m). Ignoring variability in the <I>D-H</I> relationship introduced wide-ranging error to biomass estimation; error values ranged from -5% at a <I>baixio</I> plot to +6% at a plateau plot. Average biomass was 317 ± 28 (SE) Mg ha<SUP>-1</SUP>, and tree density and biomass fell significantly with decreasing relative elevation.
著者
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ISHIZUKA Moriyoshi
Forestry and Forest Products Research Institute
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SAKAI Takeshi
Forestry and Forest Products Research Institute
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Kajimoto Takuya
Forestry And Forest Products Res. Inst. Tsukuba Jpn
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SILVA Roseana
Tropical Forestry Department, National Institute for Amazon Research
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SUWA Rempei
Forestry and Forest Products Research Institute
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SANTOS Joaquim
Tropical Forestry Department, National Institute for Amazon Research
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HIGUCHI Niro
Tropical Forestry Department, National Institute for Amazon Research
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