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. 2017 Oct 5;12(10):e0183819. doi: 10.1371/journal.pone.0183819

Table 1. Forest structure and dynamics by soil type and topography.

Variable Flat alluvial mean SEM Ridgetops mean SEM Slopes mean SEM Soil effect Slope effect
Stem Number 201.4 2.3 262.1 1.8 272.8 2.0 *** NS
Mean stem diameter mm 230.2 1.5 198.8 0.9 203.9 0.9 ** NS
Basal area (m2) 12.3 0.1 11.1 0.1 12.1 0.1 NS NS
EAGB Mg 88.1 0.9 74.3 1.0 80.8 1.2 * NS
Mean annual diameter growth rate mm 2.9 0.0 3.1 0.1 3.0 0.1 NS NS
Mean annual BA addition/plot m2 0.266 0.003 0.286 0.005 0.304 0.005 NS NS
Mean annual EAGB addition per plot MG 2.11 0.03 2.14 0.04 2.31 0.04 NS NS
Mean annual mortality % 2.10 0.13 2.56 0.23 2.40 0.14 * NS
Mean annual recruitment % 1.87 0.09 3.11 0.17 2.35 0.13 * NS
Mean annual turnover % 1.98 0.08 2.83 0.16 2.37 0.09 * NS
Basal area residence time (yrs) 41.0 0.6 32.8 0.8 34.1 0.9 * NS
EAGB residence time (yrs) 39.9 0.6 32.6 0.8 33.3 0.9 * NS

SEM = standard error of the mean, EAGB = Estimated above-ground biomass, BA = basal area. All data are from 18 consecutive annual censuses, 6 0.5 ha plots per edaphic category. Edaphic category statistics are based on analysis of the mean values of each variable per 0.50 ha plot. Repeated measures ANOVA were based on annual plot-level values with plots as subjects and edaphic category as the treatment. Soil effect refers to tests for difference between plots on flat topography on the two soils (alluvial vs. ridgetop plots); slope effect refers to tests for differences between plots on similar soils and contrasting flat versus steeply-sloped topography. Residence times are calculated as each year's basal area or EAGB divided by that year's plot-level basal area or EAGB increment. Residence times apply to EAGB and basal area in the ≥10 cm diameter portion of each individual.

* P<0.05,

** P<0.01,

*** P<0.001.