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Article ; Online: Long-term droughts may drive drier tropical forests towards increased functional, taxonomic and phylogenetic homogeneity.

Aguirre-Gutiérrez, Jesús / Malhi, Yadvinder / Lewis, Simon L / Fauset, Sophie / Adu-Bredu, Stephen / Affum-Baffoe, Kofi / Baker, Timothy R / Gvozdevaite, Agne / Hubau, Wannes / Moore, Sam / Peprah, Theresa / Ziemińska, Kasia / Phillips, Oliver L / Oliveras, Imma

Nature communications

2020 Volume 11, Issue 1, Page(s) 3346

Abstract: Tropical ecosystems adapted to high water availability may be highly impacted by climatic changes that increase soil and atmospheric moisture deficits. Many tropical regions are experiencing significant changes in climatic conditions, which may induce ... ...

Abstract	Tropical ecosystems adapted to high water availability may be highly impacted by climatic changes that increase soil and atmospheric moisture deficits. Many tropical regions are experiencing significant changes in climatic conditions, which may induce strong shifts in taxonomic, functional and phylogenetic diversity of forest communities. However, it remains unclear if and to what extent tropical forests are shifting in these facets of diversity along climatic gradients in response to climate change. Here, we show that changes in climate affected all three facets of diversity in West Africa in recent decades. Taxonomic and functional diversity increased in wetter forests but tended to decrease in forests with drier climate. Phylogenetic diversity showed a large decrease along a wet-dry climatic gradient. Notably, we find that all three facets of diversity tended to be higher in wetter forests. Drier forests showed functional, taxonomic and phylogenetic homogenization. Understanding how different facets of diversity respond to a changing environment across climatic gradients is essential for effective long-term conservation of tropical forest ecosystems.
MeSH term(s)	Africa, Western ; Biodiversity ; Biomass ; Climate Change ; Conservation of Natural Resources ; Droughts ; Forests ; Phylogeny ; Plant Dispersal ; Plants/genetics ; Rain ; Soil/chemistry ; Tropical Climate ; Water
Chemical Substances	Soil ; Water (059QF0KO0R)
Language	English
Publishing date	2020-07-03
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2553671-0
ISSN	2041-1723 ; 2041-1723
ISSN (online)	2041-1723
ISSN	2041-1723
DOI	10.1038/s41467-020-16973-4
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Drier tropical forests are susceptible to functional changes in response to a long‐term drought

Aguirre‐Gutiérrez, Jesús / Oliveras, Imma / Rifai, Sami / Fauset, Sophie / Adu‐Bredu, Stephen / Affum‐Baffoe, Kofi / Baker, Timothy R / Feldpausch, Ted R / Gvozdevaite, Agne / Hubau, Wannes / Kraft, Nathan J. B / Lewis, Simon L / Moore, Sam / Niinemets, Ülo / Peprah, Theresa / Phillips, Oliver L / Ziemińska, Kasia / Enquist, Brian / Malhi, Yadvinder

Ecology letters. 2019 May, v. 22, no. 5

2019

Abstract: Climatic changes have profound effects on the distribution of biodiversity, but untangling the links between climatic change and ecosystem functioning is challenging, particularly in high diversity systems such as tropical forests. Tropical forests may ... ...

Abstract	Climatic changes have profound effects on the distribution of biodiversity, but untangling the links between climatic change and ecosystem functioning is challenging, particularly in high diversity systems such as tropical forests. Tropical forests may also show different responses to a changing climate, with baseline climatic conditions potentially inducing differences in the strength and timing of responses to droughts. Trait‐based approaches provide an opportunity to link functional composition, ecosystem function and environmental changes. We demonstrate the power of such approaches by presenting a novel analysis of long‐term responses of different tropical forest to climatic changes along a rainfall gradient. We explore how key ecosystem's biogeochemical properties have shifted over time as a consequence of multi‐decadal drying. Notably, we find that drier tropical forests have increased their deciduous species abundance and generally changed more functionally than forests growing in wetter conditions, suggesting an enhanced ability to adapt ecologically to a drying environment.
Keywords	climate change ; climatic factors ; drought ; drying ; ecological footprint ; ecological function ; ecosystems ; rain ; species abundance ; tropical forests
Language	English
Dates of publication	2019-05
Size	p. 855-865.
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	LETTER
ZDB-ID	1441608-6
ISSN	1461-0248 ; 1461-023X
ISSN (online)	1461-0248
ISSN	1461-023X
DOI	10.1111/ele.13243
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Drier tropical forests are susceptible to functional changes in response to a long-term drought.

Aguirre-Gutiérrez, Jesús / Oliveras, Imma / Rifai, Sami / Fauset, Sophie / Adu-Bredu, Stephen / Affum-Baffoe, Kofi / Baker, Timothy R / Feldpausch, Ted R / Gvozdevaite, Agne / Hubau, Wannes / Kraft, Nathan J B / Lewis, Simon L / Moore, Sam / Niinemets, Ülo / Peprah, Theresa / Phillips, Oliver L / Ziemińska, Kasia / Enquist, Brian / Malhi, Yadvinder

Ecology letters

2019 Volume 22, Issue 5, Page(s) 855–865

Abstract	Climatic changes have profound effects on the distribution of biodiversity, but untangling the links between climatic change and ecosystem functioning is challenging, particularly in high diversity systems such as tropical forests. Tropical forests may also show different responses to a changing climate, with baseline climatic conditions potentially inducing differences in the strength and timing of responses to droughts. Trait-based approaches provide an opportunity to link functional composition, ecosystem function and environmental changes. We demonstrate the power of such approaches by presenting a novel analysis of long-term responses of different tropical forest to climatic changes along a rainfall gradient. We explore how key ecosystem's biogeochemical properties have shifted over time as a consequence of multi-decadal drying. Notably, we find that drier tropical forests have increased their deciduous species abundance and generally changed more functionally than forests growing in wetter conditions, suggesting an enhanced ability to adapt ecologically to a drying environment.
MeSH term(s)	Biodiversity ; Climate Change ; Droughts ; Forests ; Trees ; Tropical Climate
Language	English
Publishing date	2019-03-04
Publishing country	England
Document type	Letter
ZDB-ID	1441608-6
ISSN	1461-0248 ; 1461-023X
ISSN (online)	1461-0248
ISSN	1461-023X
DOI	10.1111/ele.13243
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Article ; Online: Drought-induced shifts in the floristic and functional composition of tropical forests in Ghana.

Fauset, Sophie / Baker, Timothy R / Lewis, Simon L / Feldpausch, Ted R / Affum-Baffoe, Kofi / Foli, Ernest G / Hamer, Keith C / Swaine, Michael D

Ecology letters

2012 Volume 15, Issue 10, Page(s) 1120–1129

Abstract: The future of tropical forests under global environmental change is uncertain, with biodiversity and carbon stocks at risk if precipitation regimes alter. Here, we assess changes in plant functional composition and biomass in 19 plots from a variety of ... ...

Abstract	The future of tropical forests under global environmental change is uncertain, with biodiversity and carbon stocks at risk if precipitation regimes alter. Here, we assess changes in plant functional composition and biomass in 19 plots from a variety of forest types during two decades of long-term drought in Ghana. We find a consistent increase in dry forest, deciduous, canopy species with intermediate light demand and a concomitant decrease in wet forest, evergreen, sub-canopy and shade-tolerant species. These changes in composition are accompanied by an increase in above-ground biomass. Our results indicate that by altering composition in favour of drought-tolerant species, the biomass stocks of these forests may be more resilient to longer term drought than short-term studies of severe individual droughts suggest.
MeSH term(s)	Adaptation, Physiological ; Biodiversity ; Biomass ; Droughts ; Ecology ; Flowers ; Ghana ; Trees ; Tropical Climate
Language	English
Publishing date	2012-10
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1441608-6
ISSN	1461-0248 ; 1461-023X
ISSN (online)	1461-0248
ISSN	1461-023X
DOI	10.1111/j.1461-0248.2012.01834.x
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Book ; Online: Data package from 'Pantropical variability in tree crown allometry' Global Ecology and Biogeography 2021

Loubota Panzou, Grace Jopaul / Fayolle, Adeline / Jucker, Tommaso / Phillips, Oliver / Bohlman, Stephanie / Banin, Lindsay F. / Lewis, Simon L. / Affum-Baffoe, Kofi / Alves, Luciana F. / Antin, Cécile / Arets, Eric / Arroyo, Luzmila / Baker, Timothy R. / Barbier, Nicolas / Beeckman, Hans / Berger, Uta / Enock Bocko, Yannick / Bongers, Frans / Bowers, Sam /

Brade, Thom / Brondizio, Eduardo S. / Chantrain, Arthur / Chave, Jerome / Compaore, Halidou / Coomes, David / Poorter, Lourens / Sterck, Frank / Veenendaal, Elmar

2021

Abstract: Aim: Tree crowns determine light interception, carbon and water exchange. Thus, understanding the factors causing tree crown allometry to vary at the tree and stand level matters greatly for the development of future vegetation modelling and for the ... ...

Abstract	Aim: Tree crowns determine light interception, carbon and water exchange. Thus, understanding the factors causing tree crown allometry to vary at the tree and stand level matters greatly for the development of future vegetation modelling and for the calibration of remote sensing products. Yet, we know little about large-scale variation and determinants in tropical tree crown allometry. In this study, we explored the continental variation in scaling exponents of site-specific crown allometry and assessed their relationships with environmental and stand-level variables in the tropics.
Keywords	Life Science
Publisher	University of Exeter
Publishing country	nl
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Residence times of woody biomass in tropical forests

Galbraith, David / Malhi, Yadvinder / Affum-Baffoe, Kofi / Castanho, Andrea D.A / Doughty, Christopher E / Fisher, Rosie A / Lewis, Simon L / Peh, Kelvin S.-H / Phillips, Oliver L / Quesada, Carlos A / Sonké, Bonaventure / Lloyd, Jon

Plant ecology & diversity. 2013 Mar. 1, v. 6, no. 1

2013

Abstract: Background: The woody biomass residence time (τw) of an ecosystem is an important variable for accurately simulating its biomass stocks.Methods and results: We reviewed published data from 177 forest plots across the tropics and found a six-fold ... ...

Abstract	Background: The woody biomass residence time (τw) of an ecosystem is an important variable for accurately simulating its biomass stocks.Methods and results: We reviewed published data from 177 forest plots across the tropics and found a six-fold variation (23–129 years) in τw across our dataset, with a median τw of ca. 50 years. This value is similar to the median default value across 21 vegetation models for tropical forests, although the range of values used in models is large (20 to 200 years).Conclusions: The notion of a constant τw across all tropical forests may be of limited utility, given the large observed variation in τw. We found that while there was little relationship between climate variables and τw, there was evidence that edaphic factors exerted a strong influence on τw. In both the Neotropics and the Paleotropics, τw was highest in heavily weathered soils, suggesting that low soil fertility and/or non-limiting soil physical conditions exert a critical influence on τw. There is considerable uncertainty in how τw will be affected by global environmental change, especially by increased atmospheric CO₂. Even small changes in τw could significantly reduce the future tropical forest carbon sink predicted by many vegetation models.
Keywords	biomass ; carbon dioxide ; carbon sinks ; data collection ; ecosystems ; edaphic factors ; global change ; models ; soil fertility ; soil physical properties ; tropical forests ; tropics ; uncertainty
Language	English
Dates of publication	2013-0301
Size	p. 139-157.
Publishing place	Taylor & Francis
Document type	Article
ISSN	1755-1668
DOI	10.1080/17550874.2013.770578
Database	NAL-Catalogue (AGRICOLA)

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Article: Competition influences tree growth, but not mortality, across environmental gradients in Amazonia and tropical Africa

Rozendaal, Danaë M. A / Phillips, Oliver L / Lewis, Simon L / Affum‐Baffoe, Kofi / Alvarez-Davila, Esteban / Andrade, Ana / Aragão, Luiz E. O. C / Araujo‐Murakami, Alejandro / Baker, Timothy R / Bánki, Olaf / Brienen, Roel J. W / Camargo, José Luis C / Comiskey, James A / Djuikouo Kamdem, Marie Noël / Fauset, Sophie / Feldpausch, Ted R / Killeen, Timothy J / Laurance, William F / Laurance, Susan G. W /

Lovejoy, Thomas / Malhi, Yadvinder / Marimon, Beatriz S / Marimon Junior, Ben‐Hur / Marshall, Andrew R / Neill, David A / Núñez Vargas, Percy / Pitman, Nigel C. A / Poorter, Lourens / Reitsma, Jan / Silveira, Marcos / Sonké, Bonaventure / Sunderland, Terry / Taedoumg, Hermann / ter Steege, Hans / Terborgh, John W / Umetsu, Ricardo K / van der Heijden, Geertje M.F / Vilanova, Emilio / Vos, Vincent / White, Lee J. T / Willcock, Simon / Zemagho, Lise / Vanderwel, Mark C

Ecology. 2020 July, v. 101, no. 7

2020

Abstract: Competition among trees is an important driver of community structure and dynamics in tropical forests. Neighboring trees may impact an individual tree’s growth rate and probability of mortality, but large‐scale geographic and environmental variation in ... ...

Abstract	Competition among trees is an important driver of community structure and dynamics in tropical forests. Neighboring trees may impact an individual tree’s growth rate and probability of mortality, but large‐scale geographic and environmental variation in these competitive effects has yet to be evaluated across the tropical forest biome. We quantified effects of competition on tree‐level basal area growth and mortality for trees ≥10‐cm diameter across 151 ~1‐ha plots in mature tropical forests in Amazonia and tropical Africa by developing nonlinear models that accounted for wood density, tree size, and neighborhood crowding. Using these models, we assessed how water availability (i.e., climatic water deficit) and soil fertility influenced the predicted plot‐level strength of competition (i.e., the extent to which growth is reduced, or mortality is increased, by competition across all individual trees). On both continents, tree basal area growth decreased with wood density and increased with tree size. Growth decreased with neighborhood crowding, which suggests that competition is important. Tree mortality decreased with wood density and generally increased with tree size, but was apparently unaffected by neighborhood crowding. Across plots, variation in the plot‐level strength of competition was most strongly related to plot basal area (i.e., the sum of the basal area of all trees in a plot), with greater reductions in growth occurring in forests with high basal area, but in Amazonia, the strength of competition also varied with plot‐level wood density. In Amazonia, the strength of competition increased with water availability because of the greater basal area of wetter forests, but was only weakly related to soil fertility. In Africa, competition was weakly related to soil fertility and invariant across the shorter water availability gradient. Overall, our results suggest that competition influences the structure and dynamics of tropical forests primarily through effects on individual tree growth rather than mortality and that the strength of competition largely depends on environment‐mediated variation in basal area.
Keywords	community structure ; ecosystems ; environmental factors ; mortality ; probability ; soil fertility ; tree growth ; tree mortality ; trees ; tropical forests ; wood density ; Africa ; Amazonia
Language	English
Dates of publication	2020-07
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	NAL-AP-2-clean ; JOURNAL ARTICLE
ZDB-ID	1797-8
ISSN	0012-9658
ISSN	0012-9658
DOI	10.1002/ecy.3052
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Competition influences tree growth, but not mortality, across environmental gradients in Amazonia and tropical Africa.

Rozendaal, Danaë M A / Phillips, Oliver L / Lewis, Simon L / Affum-Baffoe, Kofi / Alvarez-Davila, Esteban / Andrade, Ana / Aragão, Luiz E O C / Araujo-Murakami, Alejandro / Baker, Timothy R / Bánki, Olaf / Brienen, Roel J W / Camargo, José Luis C / Comiskey, James A / Djuikouo Kamdem, Marie Noël / Fauset, Sophie / Feldpausch, Ted R / Killeen, Timothy J / Laurance, William F / Laurance, Susan G W /

Lovejoy, Thomas / Malhi, Yadvinder / Marimon, Beatriz S / Marimon Junior, Ben-Hur / Marshall, Andrew R / Neill, David A / Núñez Vargas, Percy / Pitman, Nigel C A / Poorter, Lourens / Reitsma, Jan / Silveira, Marcos / Sonké, Bonaventure / Sunderland, Terry / Taedoumg, Hermann / Ter Steege, Hans / Terborgh, John W / Umetsu, Ricardo K / van der Heijden, Geertje M F / Vilanova, Emilio / Vos, Vincent / White, Lee J T / Willcock, Simon / Zemagho, Lise / Vanderwel, Mark C

Ecology

2020 Volume 101, Issue 7, Page(s) e03052

Abstract: Competition among trees is an important driver of community structure and dynamics in tropical forests. Neighboring trees may impact an individual tree's growth rate and probability of mortality, but large-scale geographic and environmental variation in ... ...

Abstract	Competition among trees is an important driver of community structure and dynamics in tropical forests. Neighboring trees may impact an individual tree's growth rate and probability of mortality, but large-scale geographic and environmental variation in these competitive effects has yet to be evaluated across the tropical forest biome. We quantified effects of competition on tree-level basal area growth and mortality for trees ≥10-cm diameter across 151 ~1-ha plots in mature tropical forests in Amazonia and tropical Africa by developing nonlinear models that accounted for wood density, tree size, and neighborhood crowding. Using these models, we assessed how water availability (i.e., climatic water deficit) and soil fertility influenced the predicted plot-level strength of competition (i.e., the extent to which growth is reduced, or mortality is increased, by competition across all individual trees). On both continents, tree basal area growth decreased with wood density and increased with tree size. Growth decreased with neighborhood crowding, which suggests that competition is important. Tree mortality decreased with wood density and generally increased with tree size, but was apparently unaffected by neighborhood crowding. Across plots, variation in the plot-level strength of competition was most strongly related to plot basal area (i.e., the sum of the basal area of all trees in a plot), with greater reductions in growth occurring in forests with high basal area, but in Amazonia, the strength of competition also varied with plot-level wood density. In Amazonia, the strength of competition increased with water availability because of the greater basal area of wetter forests, but was only weakly related to soil fertility. In Africa, competition was weakly related to soil fertility and invariant across the shorter water availability gradient. Overall, our results suggest that competition influences the structure and dynamics of tropical forests primarily through effects on individual tree growth rather than mortality and that the strength of competition largely depends on environment-mediated variation in basal area.
MeSH term(s)	Africa ; Brazil ; Ecosystem ; Forests ; Tropical Climate ; Wood
Language	English
Publishing date	2020-05-05
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
ZDB-ID	2010140-5
ISSN	1939-9170 ; 0012-9658
ISSN (online)	1939-9170
ISSN	0012-9658
DOI	10.1002/ecy.3052
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Article ; Online: Resistance of African tropical forests to an extreme climate anomaly.

Bennett, Amy C / Dargie, Greta C / Cuni-Sanchez, Aida / Tshibamba Mukendi, John / Hubau, Wannes / Mukinzi, Jacques M / Phillips, Oliver L / Malhi, Yadvinder / Sullivan, Martin J P / Cooper, Declan L M / Adu-Bredu, Stephen / Affum-Baffoe, Kofi / Amani, Christian A / Banin, Lindsay F / Beeckman, Hans / Begne, Serge K / Bocko, Yannick E / Boeckx, Pascal / Bogaert, Jan /

Brncic, Terry / Chezeaux, Eric / Clark, Connie J / Daniels, Armandu K / de Haulleville, Thales / Djuikouo Kamdem, Marie-Noël / Doucet, Jean-Louis / Evouna Ondo, Fidèle / Ewango, Corneille E N / Feldpausch, Ted R / Foli, Ernest G / Gonmadje, Christelle / Hall, Jefferson S / Hardy, Olivier J / Harris, David J / Ifo, Suspense A / Jeffery, Kathryn J / Kearsley, Elizabeth / Leal, Miguel / Levesley, Aurora / Makana, Jean-Remy / Mbayu Lukasu, Faustin / Medjibe, Vincent P / Mihindu, Vianet / Moore, Sam / Nssi Begone, Natacha / Pickavance, Georgia C / Poulsen, John R / Reitsma, Jan / Sonké, Bonaventure / Sunderland, Terry C H / Taedoumg, Hermann / Talbot, Joey / Tuagben, Darlington S / Umunay, Peter M / Verbeeck, Hans / Vleminckx, Jason / White, Lee J T / Woell, Hannsjoerg / Woods, John T / Zemagho, Lise / Lewis, Simon L

Proceedings of the National Academy of Sciences of the United States of America

2021 Volume 118, Issue 21

Abstract: The responses of tropical forests to environmental change are critical uncertainties in predicting the future impacts of climate change. The positive phase of the 2015-2016 El Niño Southern Oscillation resulted in unprecedented heat and low precipitation ...

Abstract	The responses of tropical forests to environmental change are critical uncertainties in predicting the future impacts of climate change. The positive phase of the 2015-2016 El Niño Southern Oscillation resulted in unprecedented heat and low precipitation in the tropics with substantial impacts on the global carbon cycle. The role of African tropical forests is uncertain as their responses to short-term drought and temperature anomalies have yet to be determined using on-the-ground measurements. African tropical forests may be particularly sensitive because they exist in relatively dry conditions compared with Amazonian or Asian forests, or they may be more resistant because of an abundance of drought-adapted species. Here, we report responses of structurally intact old-growth lowland tropical forests inventoried within the African Tropical Rainforest Observatory Network (AfriTRON). We use 100 long-term inventory plots from six countries each measured at least twice prior to and once following the 2015-2016 El Niño event. These plots experienced the highest temperatures and driest conditions on record. The record temperature did not significantly reduce carbon gains from tree growth or significantly increase carbon losses from tree mortality, but the record drought did significantly decrease net carbon uptake. Overall, the long-term biomass increase of these forests was reduced due to the El Niño event, but these plots remained a live biomass carbon sink (0.51 ± 0.40 Mg C ha
MeSH term(s)	Carbon Cycle ; Climate Change ; Droughts ; El Nino-Southern Oscillation ; Hot Temperature ; Humans ; Rainforest ; Seasons ; Trees/growth & development ; Tropical Climate
Language	English
Publishing date	2021-05-17
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	209104-5
ISSN	1091-6490 ; 0027-8424
ISSN (online)	1091-6490
ISSN	0027-8424
DOI	10.1073/pnas.2003169118
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Article: Pantropical variability in tree crown allometry

Loubota Panzou, Grace Jopaul / Fayolle, Adeline / Jucker, Tommaso / Phillips, Oliver L / Bohlman, Stephanie / Banin, Lindsay F / Lewis, Simon L / Affum‐Baffoe, Kofi / Alves, Luciana F / Antin, Cécile / Arets, Eric / Arroyo, Luzmila / Baker, Timothy R / Barbier, Nicolas / Beeckman, Hans / Berger, Uta / Bocko, Yannick Enock / Bongers, Frans / Bowers, Sam /

Brade, Thom / Brondizio, Eduardo S / Chantrain, Arthur / Chave, Jerome / Compaore, Halidou / Coomes, David / Diallo, Adama / Dias, Arildo S / Dimobe, Kangbéni / Djagbletey, Gloria Djaney / Domingues, Tomas / Doucet, Jean‐Louis / Drouet, Thomas / Forni, Eric / Godlee, John L / Goodman, Rosa C / Gourlet‐Fleury, Sylvie / Hien, Fidele / Iida, Yoshiko / Ilondea, Bhely Angoboy / Ilunga Muledi, Jonathan / Jacques, Pierre / Kuyah, Shem / López‐Portillo, Jorge / Loumeto, Jean Joël / Marimon‐Junior, Ben Hur / Marimon, Beatriz Schwantes / Mensah, Sylvanus / Mitchard, Edward T. A / Moncrieff, Glenn R / Narayanan, Ayyappan / O’Brien, Sean T / Ouedraogo, Korotimi / Palace, Michael W / Pelissier, Raphael / Ploton, Pierre / Poorter, Lourens / Ryan, Casey M / Saiz, Gustavo / dos Santos, Karin / Schlund, Michael / Sellan, Giacomo / Sonke, Bonaventure / Sterck, Frank / Thibaut, Quentin / Van Hoef, Yorick / Veenendaal, Elmar / Vovides, Alejandra G / Xu, Yaozhan / Yao, Tze Leong / Feldpausch, Ted R

Global ecology and biogeography. 2021 Feb., v. 30, no. 2

2021

Abstract: AIM: Tree crowns determine light interception, carbon and water exchange. Thus, understanding the factors causing tree crown allometry to vary at the tree and stand level matters greatly for the development of future vegetation modelling and for the ... ...

Abstract	AIM: Tree crowns determine light interception, carbon and water exchange. Thus, understanding the factors causing tree crown allometry to vary at the tree and stand level matters greatly for the development of future vegetation modelling and for the calibration of remote sensing products. Nevertheless, we know little about large‐scale variation and determinants in tropical tree crown allometry. In this study, we explored the continental variation in scaling exponents of site‐specific crown allometry and assessed their relationships with environmental and stand‐level variables in the tropics. LOCATION: Global tropics. TIME PERIOD: Early 21st century. MAJOR TAXA STUDIED: Woody plants. METHODS: Using a dataset of 87,737 trees distributed among 245 forest and savanna sites across the tropics, we fitted site‐specific allometric relationships between crown dimensions (crown depth, diameter and volume) and stem diameter using power‐law models. Stand‐level and environmental drivers of crown allometric relationships were assessed at pantropical and continental scales. RESULTS: The scaling exponents of allometric relationships between stem diameter and crown dimensions were higher in savannas than in forests. We identified that continental crown models were better than pantropical crown models and that continental differences in crown allometric relationships were driven by both stand‐level (wood density) and environmental (precipitation, cation exchange capacity and soil texture) variables for both tropical biomes. For a given diameter, forest trees from Asia and savanna trees from Australia had smaller crown dimensions than trees in Africa and America, with crown volumes for some Asian forest trees being smaller than those of trees in African forests. MAIN CONCLUSIONS: Our results provide new insight into geographical variability, with large continental differences in tropical tree crown allometry that were driven by stand‐level and environmental variables. They have implications for the assessment of ecosystem function and for the monitoring of woody biomass by remote sensing techniques in the global tropics.
Keywords	allometry ; biogeography ; calibration ; carbon ; cation exchange capacity ; data collection ; depth ; diameter ; dimensions ; ecological function ; ecosystems ; environmental factors ; forest trees ; forests ; geographical variation ; light ; models ; monitoring ; remote sensing ; savannas ; soil texture ; tree crown ; tropical plants ; tropics ; variability ; volume ; water ; wood density ; woody biomass ; woody plants ; Africa ; Asia ; Australia
Language	English
Dates of publication	2021-02
Size	p. 459-475.
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	NAL-light ; JOURNAL ARTICLE
ZDB-ID	2021283-5
ISSN	1466-8238 ; 1466-822X ; 0960-7447
ISSN (online)	1466-8238
ISSN	1466-822X ; 0960-7447
DOI	10.1111/geb.13231
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In stock of ZB MED Bonn / Germany

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Inter-library loan at ZB MED

Full text online

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Order via subito

Inter-library loan at ZB MED

Full text online

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Order via subito

More links

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In stock of ZB MED Cologne/Königswinter

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Order via subito