Insights into regional patterns of Amazonian forest structure, diversity, and dominance from three large terra-firme forest dynamics plots

Duque, Álvaro; Muller‐Landau, Helene C.; Valencia, Renato; Cárdenas, Dairon; Davies, Stuart J.; Oliveira, Alexandre Adalardo de; Pérez, Álvaro J.; Romero‐Saltos, Hugo; Vicentini, Alberto

doi:10.1007/s10531-016-1265-9

Cited by 34 publications

(30 citation statements)

References 37 publications

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“…, Duque et al. ), exhibits systematic variation in AGB stocks and mortality rates among different topographic habitats ‐ e.g., ridges and valleys (Chave et al. , Valencia et al.…”

Section: Introductionmentioning

confidence: 99%

“…Local variation in climate and soils also play an important role in defining tree sensitivity to water stress (Johnson et al 2016, Levine et al 2016. The Amazon terra firme tropical forest, one of the most diverse ecosystems on earth (ter Steege et al 2003, Duque et al 2017, exhibits systematic variation in AGB stocks and mortality rates among different topographic habitats -e.g., ridges and valleys (Chave et al 2003, Valencia et al 2009, Detto et al 2013. Valleys have higher moisture availability than hills or ridges, and thus trees in valleys may have less tolerance to water shortage than those on slopes or ridges (Condit et al 1995, Harms et al 2001, Itoh et al 2012).…”

Section: Introductionmentioning

confidence: 99%

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Drought‐induced mortality patterns and rapid biomass recovery in a terra firme forest in the Colombian Amazon

Zuleta

Duque

Cárdenas

et al. 2017

Ecology

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Extreme climatic events affecting the Amazon region are expected to become more frequent under ongoing climate change. In this study, we assessed the responses to the 2010 drought of over 14,000 trees ≥10 cm dbh in a 25 ha lowland forest plot in the Colombian Amazon and how these responses varied among topographically defined habitats, with tree size, and with species wood density. Tree mortality was significantly higher during the 2010-2013 period immediately after the drought than in 2007-2010. The post-drought increase in mortality was stronger for trees located in valleys (+243%) than for those located on slopes (+67%) and ridges (+57%). Tree-based generalized linear mixed models showed a significant negative effect of species wood density on mortality and no effect of tree size. Despite the elevated post-drought mortality, aboveground biomass increased from 2007 to 2013 by 1.62 Mg ha yr (95% CI 0.80-2.43 Mg ha yr ). Biomass change varied among habitats, with no significant increase on the slopes (1.05, 95% CI -0.76 to 2.85 Mg ha yr ), a significant increase in the valleys (1.33, 95% CI 0.37-2.34 Mg ha yr ), and a strong increase on the ridges (2.79, 95% CI 1.20-4.21 Mg ha yr ). These results indicate a high carbon resilience of this forest to the 2010 drought due to habitat-associated and interspecific heterogeneity in responses including directional changes in functional composition driven by enhanced performance of drought-tolerant species that inhabit the drier ridges.

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“…, Duque et al. ), exhibits systematic variation in AGB stocks and mortality rates among different topographic habitats ‐ e.g., ridges and valleys (Chave et al. , Valencia et al.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Drought‐induced mortality patterns and rapid biomass recovery in a terra firme forest in the Colombian Amazon

Zuleta

Duque

Cárdenas

et al. 2017

Ecology

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“…All woody plants with a dbh ≥1 cm at the 25‐ha Amacayacu forest plot were tallied, mapped and identified. The plot harbors around 1,200 tree species, which makes of it one of the most diverse places on Earth (Duque et al, ). Eschweilera coriacea , Eschweilera itayensis , Eschweilera rufifolia , Otoba glycicarpa , Guarea pubescens and Rinorea lindeniana are important species in terms of basal area and abundance within the plot (Ellison et al, ).…”

Section: Methodsmentioning

confidence: 99%

Holocene increases in palm abundances in north‐western Amazonia

Heijink

McMichael

Piperno

et al. 2019

Journal of Biogeography

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Aim In Amazonia, 227 of c. 16,000 tree species account for half the individual trees (termed ‘hyperdominant’ species), and a disproportionate number of these species are palms. Our objectives are to show how and whether palm abundance has changed through the Holocene. Here, we reconstruct a detailed fire and vegetation history from north‐western Amazonia, with a focus on changes in palm abundances, and compare our results with regional data. Location Amacayacu, Colombia. Taxon Amazonian palms. Methods We performed charcoal and phytolith analysis on soil cores, and obtained ages of past fires using 14C dating. We measured charcoal abundances and the relative abundances of phytoliths (silica‐based microfossils) for all samples. We used these data to reconstruct changes in fire and vegetation, and compared these data with the species composition of palms in the modern forest. Results Seven 14C dates from charcoal in three cores provided fire ages ranging from 1630 to 2450 calibrated years before present. Charcoal was absent from one‐third of the cores. Palm phytoliths from genera such as Iriartea, Socratea, and Astrocaryum have increased through time, while genera such as Euterpe, Hyospathe, and Oenocarpus have remained relatively stable and similar to modern levels. Overall, palm abundances were negatively correlated with charcoal measurements. Decorated sphere phytoliths, produced from unknown arboreal taxa were positively correlated with charcoal presence and abundance. Main conclusions Palms have increased at Amacayacu and other forest plots through time, but the increases are largest in north‐western Amazonia. The presence of fire, however, dampens the increase in palms through time. When compared with reconstructions from other Amazon regions, our results suggest that increases in palm abundances in the late Holocene occurred both in the presence and absence of direct pre‐Columbian human influence, and that response was strongest in north‐western Amazonia when human influence was minimal.

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“…Data is taken from rainforest plots >10 ha in size, <18.0 0 north and south of the equator, and within the elevational range of the CSIRO plots. Africa; 6 plots; [24,43,44], south-east Asia; 7 plots; [45-50], America; 8 plots: [51][52][53][54]. Stems >60 cm DBH are considered large due to the availability of relevant comparative data.…”

Section: Accounting For High Agb In Australian Wet Tropical Rainforestmentioning

confidence: 99%

The importance of large-diameter trees in the wet tropical rainforests of Australia

Bradford

Murphy

2018

Preprint

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9Large trees are keystone structures in many terrestrial ecosystems. They contribute 10 disproportionately to reproduction, recruitment and succession, and influence the structure, 11 dynamics, and diversity of forests. Recently, researchers have become concerned about evidence 12 showing rapid declines in large, old trees in a range of ecosystems across the globe. We used ≥10cm 13 diameter at breast height (DBH) stem inventory data from 20, 0.5 ha forest plots spanning the wet 14 tropical rainforest of Queensland, Australia to examine the contribution of large-diameter trees to 15 above ground biomass (AGB), richness, dominance, mortality and recruitment. We show 16 consistencies with tropical rainforest globally in that large-diameter trees (≥70 cm DBH) contribute 17 much of the biomass (33%) from few trees (2.4% of stems ≥10cm DBH) with the density of the 18 largest trees explaining much of the variation (62%) in AGB across plots. Measurement of AGB in the 19 largest 5% of trees allows plot biomass to be predicted with ~85% precision. In contrast to rainforest 20 in Africa and America, we show that a high proportion of species are capable of reaching a large-21 diameter in Australian wet tropical rainforest resulting in weak biomass hyperdominance (~10% of 22species account for 50% of the biomass) and high potential resilience to regional disturbances and 23 global environmental change. We show that the high AGB in Australian tropical forests is driven 24 primarily by the relatively high density of large trees coupled with contributions from significantly 25 higher densities of medium size trees. Australian wet tropical rainforests are well positioned to 26 maintain the current densities of large-diameter trees and high AGB into the future due to the 27 species richness of large trees and a high density of replacement smaller trees.3 28

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Insights into regional patterns of Amazonian forest structure, diversity, and dominance from three large terra-firme forest dynamics plots

Cited by 34 publications

References 37 publications

Drought‐induced mortality patterns and rapid biomass recovery in a terra firme forest in the Colombian Amazon

Drought‐induced mortality patterns and rapid biomass recovery in a terra firme forest in the Colombian Amazon

Holocene increases in palm abundances in north‐western Amazonia

The importance of large-diameter trees in the wet tropical rainforests of Australia

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