Large tree species composition, not growth rates, is affected by topography in a Bornean tropical forest

Large trees (diameter at breast height ≥50 cm) play a vital role in providing ecological services in tropical forests and can store up to 50% of aboveground biomass. We expected that topography (as a nutrient and drought proxy) would affect large tree dynamics, biomass, diversity, and composition pa...

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Bibliographic Details
Published in:Biotropica 2021-09, Vol.53 (5), p.1290-1300
Main Authors: Limin, Army, Slik, Ferry, Sukri, Rahayu Sukmaria, Chen, Sheng‐Bin, Ahmad, Joffre Ali
Format: Article
Language:English
Subjects:
Area
Biomass
Brunei Darussalam
Climate change
Community composition
Composition
Drought
Elevation
elevational gradient
floristic shift
Growth rate
Herbivores
large tree dynamics
Mineral nutrients
Moisture content
Mortality
Nutrient dynamics
Plant diversity
Plant species
Population decline
Recruitment
Soil
Soil density
Soil properties
Soil water
soil water availability
Species
Species composition
Swamps
Topography
Trees
Tropical climate
tropical forest
Tropical forests
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Summary:Large trees (diameter at breast height ≥50 cm) play a vital role in providing ecological services in tropical forests and can store up to 50% of aboveground biomass. We expected that topography (as a nutrient and drought proxy) would affect large tree dynamics, biomass, diversity, and composition patterns. To test this, we established a 15‐ha permanent plot at Andulau Forest Reserve (Brunei Darussalam, Borneo) with an elevation ranging from 42 m (swamp) to 92 m (ridge tops). All 559 large trees (131 species) were labeled, identified, and fitted with dendrometers. Stem density, basal area (BA), soil and litter properties, absolute diameter growth rate (AGR), and recruitment and mortality rates of large trees were determined for five elevational zones for the period 2016–2019. Stem density and BA of large trees were significantly higher in the upslope and ridge areas of the plot, and a clear shift in large tree species composition was found across the elevational zones, with the swampy area differing most from all others. However, AGR did not differ between elevational zones. Large tree mortality was balanced by recruitment, but sample size was too low to detect topographical patterns. Our findings suggest that the large tree community retained similar growth rates across soil water and nutrient gradient via a shift in species composition. If so, predicted declines in large tree productivity with climate change may, over time, also be offset by changes in species composition. We studied whether large trees with a diameter of 50 cm and above differ in dynamics (growth, recruitment, mortality), composition, and structure (density and basal area) along a local topographical gradient (proxy for soil nutrient and water status). We found that large tree growth remained constant, but species composition and structure changed along the topographical gradient. Our study suggests that climate change in the form of droughts may not so much affect large tree productivity but rather lead to shifts in species composition.
ISSN:0006-3606
1744-7429
DOI:10.1111/btp.12969