The average air-dried wood density in plots corresponded
strongly with known disturbance history of the locations.
Average wood densities increased progressively
from twice-burned, once-burned, selectively logged, and
old-growth forests (Fig. 1). The relationship between
average wood density in plots and the percentage of
pioneer trees in the plots was significantly negative
(Fig. 2). In addition, the higher the average wood density
of a plot, the higher the chance the plot was in old-growth
forest, with the turning point located at a wood density
of approximately 0.60 g/cm3 (i.e., above that value the
chance that a plot was in old-growth forest was >50%)
(Fig. 3). This chance increased to nearly 100% for plots
with an average wood density ≥0.70 g/cm3.
The Borneo endemics that were co-occurring with
widespread Malesian species in the Samboja–Sungai Wain
plots had significantly heavier wood than the widespread
species, 0.69 versus 0.63 g/cm3, respectively (Fig. 4).
They were also significantly more common (percentage
of individuals) in plots with higher average wood density
(Fig. 5).
All 3 data sets showed a significant unimodal relationship
between average wood density and tree species diversity
in a plot (Table 1; Fig. 6), with highest diversity at
average wood density of approximately 0.68 g/cm3.
The average air-dried wood density in plots correspondedstrongly with known disturbance history of the locations.Average wood densities increased progressivelyfrom twice-burned, once-burned, selectively logged, andold-growth forests (Fig. 1). The relationship betweenaverage wood density in plots and the percentage ofpioneer trees in the plots was significantly negative(Fig. 2). In addition, the higher the average wood densityof a plot, the higher the chance the plot was in old-growthforest, with the turning point located at a wood densityof approximately 0.60 g/cm3 (i.e., above that value thechance that a plot was in old-growth forest was >50%)(Fig. 3). This chance increased to nearly 100% for plotswith an average wood density ≥0.70 g/cm3.The Borneo endemics that were co-occurring withwidespread Malesian species in the Samboja–Sungai Wainplots had significantly heavier wood than the widespreadspecies, 0.69 versus 0.63 g/cm3, respectively (Fig. 4).They were also significantly more common (percentageof individuals) in plots with higher average wood density(Fig. 5).All 3 data sets showed a significant unimodal relationshipbetween average wood density and tree species diversityin a plot (Table 1; Fig. 6), with highest diversity ataverage wood density of approximately 0.68 g/cm3.
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