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Pubblicazioni Scientifiche
Filtri di ricerca 9 risultati
Pubblicazioni per anno
Comparative analysis of taper models for Pinus nigra Arn. using terrestrial laser scanner acquired data
Boukhris
,
Issam
,
Puletti
,
Nicola
,
Vonderach
,
Christian
,
Guasti
,
Matteo
,
Lahssini
,
Said
,
Santini
,
Monia
,
Valentini
,
Riccardo
forest mensuration
b-splines
environmental management
forest as-sessment
max and burkhart
random forest
taper equations
tls
volume equations
Mostra abstract
Taper equations are indispensable tools for characterizing the stem profile of trees, providing valuable insights for forest management, timber inventory, and optimal assortments allocation. The recent progress in Terrestrial Laser Scanning (TLS) has revolutionized forest inventory practices by enabling non-destructive data collection. In this study, four taper models from three different model categories were established based on point cloud data of 219 Pinus nigra trees. The taper equations fitted with TLS data were used to predict the diameter at specific stem heights and the total stem volume. The results show that among fitted models, the Max and Burkhart segmented model calibrated by the means of a mixed-effects approach provided the best estimate of the diameter at different heights and the total stem volume evaluated for different diameter at breast height (DBH) classes. In numerical terms, this model es-timated the diameter and the volume with a respective overall error of 0.781 cm and 0.021 m<sup>3</sup>. The predicted profile also shows that above a relative height of 0.7, the diameter error tends to increase due to the low reliability of data collected beyond the base of the crown primarily caused by interference from branches and leaves. Nevertheless, this study shows that TLS technology presents a compelling opportunity and a promising non-destructive alternative for generating taper profiles and estimating tree volume. © SISEF.
Potential of ALOS2 Polarimetric Imagery to Support Management of Poplar Plantations in Northern Italy
Vaglio Laurin
,
Gaia
,
Mattioli
,
Walter
,
Innocenti
,
Simone
,
Lombardo
,
Emanuela
,
Valentini
,
Riccardo
,
Puletti
,
Nicola
Mostra abstract
Poplar is one of the most widespread fast-growing forest species. In Northern Italy, plantations are characterized by large interannual fluctuations, requiring frequent monitoring to inform on wood supply and to manage the stands. The use of radar satellite data is proving useful for forest monitoring, being weather independent and sensitive to the changes in forest canopy structure, but it has been scarcely tested in the case of poplar. Here, L-band ALOS2 (Advanced Land Observing Satellite-2) dual-pol data were tested to detect clear-cut plantations in consecutive years. ALOS2 quad-pol data were used to discriminate among different age classes, a much complex task than detecting poplar plantations extent. Results from different machine learning algorithms indicate that with dual-pol data, poplar forest can be discriminated from clear-cut areas with 80% overall accuracy, similar to what is usually obtained with optical data. With quad-pol data, four age classes were classified with moderate overall accuracy (73%) based on polarimetric decompositions, three 3 age classes with higher accuracy (87%) based on HV band. Sources of error are represented by poplar areas of intermediate age when stems, branches and leaves were not developed enough to detect by scattering mechanisms. This study demonstrates the feasibility of monitoring poplar plantations with satellite radar, which represents a growing source of information thanks to already-planned future satellite missions. © 2022 by the authors.
Above ground biomass and tree species richness estimation with airborne lidar in tropical Ghana forests
Vaglio Laurin
,
Gaia
,
Puletti
,
Nicola
,
Chen
,
Qi
,
Corona
,
P.
,
Papale
,
Dario
,
Valentini
,
Riccardo
Mostra abstract
Estimates of forest aboveground biomass are fundamental for carbon monitoring and accounting; delivering information at very high spatial resolution is especially valuable for local management, conservation and selective logging purposes. In tropical areas, hosting large biomass and biodiversity resources which are often threatened by unsustainable anthropogenic pressures, frequent forest resources monitoring is needed. Lidar is a powerful tool to estimate aboveground biomass at fine resolution; however its application in tropical forests has been limited, with high variability in the accuracy of results. Lidar pulses scan the forest vertical profile, and can provide structure information which is also linked to biodiversity. In the last decade the remote sensing of biodiversity has received great attention, but few studies focused on the use of lidar for assessing tree species richness in tropical forests. This research aims at estimating aboveground biomass and tree species richness using discrete return airborne lidar in Ghana forests. We tested an advanced statistical technique, Multivariate Adaptive Regression Splines (MARS), which does not require assumptions on data distribution or on the relationships between variables, being suitable for studying ecological variables. We compared the MARS regression results with those obtained by multilinear regression and found that both algorithms were effective, but MARS provided higher accuracy either for biomass (R<sup>2</sup> = 0.72) and species richness (R<sup>2</sup> = 0.64). We also noted strong correlation between biodiversity and biomass field values. Even if the forest areas under analysis are limited in extent and represent peculiar ecosystems, the preliminary indications produced by our study suggest that instrument such as lidar, specifically useful for pinpointing forest structure, can also be exploited as a support for tree species richness assessment. © 2016 Elsevier B.V.
Discrimination of tropical forest types, dominant species, and mapping of functional guilds by hyperspectral and simulated multispectral Sentinel-2 data
Vaglio Laurin
,
Gaia
,
Puletti
,
Nicola
,
Hawthorne
,
William D.
,
Liesenberg
,
Veraldo
,
Corona
,
P.
,
Papale
,
Dario
,
Chen
,
Qi
,
Valentini
,
Riccardo
Mostra abstract
To answer new scientific and ecological questions and monitor multiple forest changes, a fine scale characterization of these ecosystems is needed, and could imply the mapping of specific species, of detailed forest types, and of functional composition. This characterization can be now provided by the novel Earth Observation tools. This study aims to contribute to understanding the innovation in forest and ecological research that can be brought in by advanced remote sensing instruments, and proposes the guild mapping approach as a tool to efficiently monitor the varied tropical forest resources. We evaluated, in tropical Ghanaian forests, the ability of airborne hyperspectral and simulated multispectral Sentinel-2 data, and derived vegetation indices and textures, to: distinguish between two different forest types; to discriminate among selected dominant species; and to separate trees species grouped according to their functional guilds: Pioneer, Non Pioneer Light Demanding, and Shade Bearer. We then produced guild classification maps for each area using hyperspectral data. Our results showed that with both hyperspectral and simulated Sentinel-2 data these discrimination tasks can be successfully accomplished. Results also stressed the importance of texture features, especially if using the lower spectral and spatial Sentinel-2 resolution data, and highlighted the important role of the new Sentinel-2 data for ecological monitoring. Classification results showed a statistically significant improvement in overall accuracy using Support Vector Machine, over Maximum Likelihood approach. We proposed the functional guilds mapping as an innovative approach to: (i) monitor compositional changes, especially with respect to the effects of global climate change on forests, and particularly in the tropical biome where the occurrence of hundreds of species prevents mapping activities at species level; (ii) support large-scale forest inventories. The imminent Sentinel-2 data could serve to open the road for the development of new concepts and methods in forestry and ecological research. © 2016 Elsevier Inc.
Continental Contrasts in Climate Extremes That Control Tree Fecundity
Clark
,
James S.
,
Andrus
,
Robert A.
,
Arianoutsou
,
Margarita
,
Ascoli
,
Davide
,
Bergeron
,
Yves
,
Bogdziewicz
,
Michał
,
Boivin
,
Thomas
,
Bonal
,
Raúl
,
Caignard
,
Thomas
,
Cailleret
,
Maxime
,
Calama
,
Rafael A.
,
Camarero
,
Jesús Julio
,
Chianucci
,
Francesco
,
Cienciala
,
Emil
,
Courbaud
,
Benoít
,
Delzon
,
Sylvain
,
Dietze
,
Michael C.
,
Espelta
,
Josep Maria
,
Fady
,
Bruno
,
Fyllas
,
Nikolaos M.
,
Gilbert
,
Gregory S.
,
Gratzer
,
Georg
,
Guignabert
,
Arthur
,
Hacket-Pain
,
Andrew J.
,
Hampe
,
Arndt
,
Hanley
,
Mick E.
,
Hille Ris Lambers
,
Janneke
,
Holik
,
Jan
,
Hoshizaki
,
K.
,
Hu
,
Miao
,
Ibáñez
,
Inés
,
Işık
,
Fatih
,
Jenkins
,
Lauren
,
Johnstone
,
Jill F.
,
Journé
,
Valentin
,
Kadioglu
,
Alper Kaan
,
Kızılaslan
,
İrem Sena
,
Knops
,
Johannes Michael Hubertus
,
Kobe
,
Richard K.
,
Köse
,
Nesibe
,
Külah
,
Eylül U.
,
Kunstler
,
Georges
,
LaMontagne
,
Jalene M.
,
Ledwoń
,
Mateusz
,
Lehtonen
,
Aleksi
,
Loewe-Muñoz
,
Verónica F.
,
Lutz
,
James A.
,
Mårell
,
Anders
,
Meyer
,
Kira
,
Moran
,
Emily V.
,
Motta
,
Renzo
,
Myers
,
Jonathan A.
,
Nagel
,
Thomas A.
,
Pérez-Ramos
,
Ignacio M.
,
Piechnik
,
Łukasz
,
Podgórski
,
Tomasz
,
Poulton-Kamakura
,
Renata
,
Qiu
,
Tong
,
Redmond
,
Miranda D.
,
Reid
,
Chantal D.
,
Rodman
,
Kyle C.
,
Rodríguez-Sánchez
,
Francisco
,
Šamonil
,
Pavel
,
Šebeň
,
Vladimír
,
Seget
,
Barbara
,
Sharma
,
Shubhi
,
Socha
,
Jarosław Ł.
,
Steele
,
Michael A.
,
Straub
,
Jacob N.
,
Sutton
,
Samantha
,
Thomas
,
Peter A.
,
Vacchiano
,
Giorgio
,
Venner
,
Marie Claude
,
Venner
,
Samuel
,
Zavala
,
Miguel A.
,
Zheng
,
Shiqi
,
Żywiec
,
Magdalena
Mostra abstract
In 2023, more than half of olive harvests (Olea europaea) across Spain, Greece, and Türkiye were lost to drought. The same year late freeze destroyed 90% of the peach crop (Prunus persica) on the Georgia Piedmont and the apple crop (Malus domestica) in central New York, Vermont, and southern Quebec. Climate extremes now rank with the costliest threats to agriculture, but their role in forest recovery from diebacks that are happening globally is unknown for lack of tree fecundity estimates in forests. Tolerance of climate extremes could depend on past exposure but constrained by phylogenetic conservatism. We report a continental scale analysis of climate extremes and forest fecundity across North America and Europe showing that responses to late freeze and drought are happening now. Species differences are not explained by the traits typically included in ecological studies and they are weakly associated with phylogeny. Late freeze, that is, freezing temperatures that follow the onset of flower development in spring, is shown to be “normal” in North America, but not Europe, potentially explaining failed seed production due to delayed onset and the resultant shorter growing period by North American transplants dating back at least to the 18th century. Drought has thus far had the greatest impacts in dry forested regions, but here too, species differences are not explained by traditional trait values. If responses have been buffered from drought and late freeze by past exposure, acclimation and local adaptation prove inadequate as extremes intensify. © 2026 John Wiley & Sons Ltd.
The Relationship Between Maturation Size and Maximum Tree Size From Tropical to Boreal Climates
Journé
,
Valentin
,
Bogdziewicz
,
Michał
,
Courbaud
,
Benoít
,
Kunstler
,
Georges
,
Qiu
,
Tong
,
Aravena Acuña
,
Marie Claire
,
Ascoli
,
Davide
,
Bergeron
,
Yves
,
Berveiller
,
Daniel
,
Boivin
,
Thomas
,
Bonal
,
Raúl
,
Caignard
,
Thomas
,
Cailleret
,
Maxime
,
Calama
,
Rafael A.
,
Camarero
,
Jesús Julio
,
Chang-Yang
,
Chia Hao
,
Chave
,
Jérôme
,
Chianucci
,
Francesco
,
Curt
,
Thomas
,
Cutini
,
Andrea
,
Das
,
Adrian J.
,
Daskalakou
,
Evangelia N.
,
Davi
,
Hendrik
,
Delpierre
,
Nicolas
,
Delzon
,
Sylvain
,
Dietze
,
Michael C.
,
Calderon
,
Sergio Donoso
,
Dormont
,
Laurent
,
Espelta
,
Josep Maria
,
Farfan-Rios
,
William R.
,
Fenner
,
Michael
,
Franklin
,
Jerry F.
,
Gehring
,
Catherine A.
,
Gilbert
,
Gregory S.
,
Gratzer
,
Georg
,
Greenberg
,
Cathryn H.
,
Guignabert
,
Arthur
,
Guo
,
Qinfeng
,
Hacket-Pain
,
Andrew J.
,
Hampe
,
Arndt
,
Han
,
Qingmin
,
Hanley
,
Mick E.
,
Hille Ris Lambers
,
Janneke
,
Holik
,
Jan
,
Hoshizaki
,
K.
,
Ibáñez
,
Inés
,
Johnstone
,
Jill F.
,
Knops
,
Johannes Michael Hubertus
,
Kobe
,
Richard K.
,
Kurokawa
,
Hiroko
,
Lageard
,
Jonathan G.A.
,
LaMontagne
,
Jalene M.
,
Ledwoń
,
Mateusz
,
Lefèvre
,
François
,
Leininger
,
Theodor D.
,
Limousin
,
Jean Marc
,
Lutz
,
James A.
,
Macias
,
Diana S.
,
Mårell
,
Anders
,
McIntire
,
Eliot J.B.
,
Moran
,
Emily V.
,
Motta
,
Renzo
,
Myers
,
Jonathan A.
,
Nagel
,
Thomas A.
,
Naoe
,
Shoji
,
Noguchi
,
Mahoko
,
Norghauer
,
Julian M.
,
Oguro
,
Michio
,
Ourcival
,
Jean Marc
,
Parmenter
,
Robert R.
,
Pearse
,
Ian S.
,
Pérez-Ramos
,
Ignacio M.
,
Piechnik
,
Łukasz
,
Podgórski
,
Tomasz
,
Poulsen
,
John R.
,
Redmond
,
Miranda D.
,
Reid
,
Chantal D.
,
Šamonil
,
Pavel
,
Scher
,
C. Lane
,
Schlesinger
,
William H.
,
Seget
,
Barbara
,
Sharma
,
Shubhi
,
Shibata
,
Mitsue
,
Silman
,
Miles R.
,
Steele
,
Michael A.
,
Stephenson
,
Nathan L.
,
Straub
,
Jacob N.
,
Sutton
,
Samantha
,
Swenson
,
Jennifer J.
,
Swift
,
Margaret
,
Thomas
,
Peter A.
,
Uríarte
,
María
,
Vacchiano
,
Giorgio
,
Whipple
,
Amy Vaughn
,
Whitham
,
Thomas G.
,
Wright
,
Stuart Joseph
,
Zhu
,
Kai
,
Zimmerman
,
Jess K.
,
Żywiec
,
Magdalena
,
Clark
,
James S.
Mostra abstract
The fundamental trade-off between current and future reproduction has long been considered to result in a tendency for species that can grow large to begin reproduction at a larger size. Due to the prolonged time required to reach maturity, estimates of tree maturation size remain very rare and we lack a global view on the generality and the shape of this trade-off. Using seed production from five continents, we estimate tree maturation sizes for 486 tree species spanning tropical to boreal climates. Results show that a species' maturation size increases with maximum size, but in a non-proportional way: the largest species begin reproduction at smaller sizes than would be expected if maturation were simply proportional to maximum size. Furthermore, the decrease in relative maturation size is steepest in cold climates. These findings on maturation size drivers are key to accurately represent forests' responses to disturbance and climate change. © 2024 John Wiley & Sons Ltd.
Evolutionary ecology of masting: mechanisms, models, and climate change
Bogdziewicz
,
Michał
,
Kelly
,
Dave J.
,
Ascoli
,
Davide
,
Caignard
,
Thomas
,
Chianucci
,
Francesco
,
Crone
,
Elizabeth E.
,
Fleurot
,
Emilie
,
Foest
,
Jessie J.
,
Gratzer
,
Georg
,
Hagiwara
,
Tomika
,
Han
,
Qingmin
,
Journé
,
Valentin
,
Keurinck
,
Léa
,
Kondrat
,
Katarzyna
,
McClory
,
Ryan W.
,
LaMontagne
,
Jalene M.
,
Mundo
,
Ignacio A.
,
Nussbaumer
,
Anita
,
Oberklammer
,
Iris
,
Ohno
,
Misuzu
,
Pearse
,
Ian S.
,
Pesendorfer
,
Mario B.
,
Resente
,
Giulia
,
Satake
,
Akiko
,
Shibata
,
Mitsue
,
Snell
,
Rebecca S.
,
Szymkowiak
,
Jakub
,
Touzot
,
Laura
,
Zwolak
,
Rafał
,
Żywiec
,
Magdalena
,
Hacket-Pain
,
Andrew J.
Mostra abstract
Many perennial plants show mast seeding, characterized by synchronous and highly variable reproduction across years. We propose a general model of masting, integrating proximate factors (environmental variation, weather cues, and resource budgets) with ultimate drivers (predator satiation and pollination efficiency). This general model shows how the relationships between masting and weather shape the diverse responses of species to climate warming, ranging from no change to lower interannual variation or reproductive failure. The role of environmental prediction as a masting driver is being reassessed; future studies need to estimate prediction accuracy and the benefits acquired. Since reproduction is central to plant adaptation to climate change, understanding how masting adapts to shifting environmental conditions is now a central question. © 2024 The Authors
Masting is uncommon in trees that depend on mutualist dispersers in the context of global climate and fertility gradients
Qiu
,
Tong
,
Aravena Acuña
,
Marie Claire
,
Ascoli
,
Davide
,
Bergeron
,
Yves
,
Bogdziewicz
,
Michał
,
Boivin
,
Thomas
,
Bonal
,
Raúl
,
Caignard
,
Thomas
,
Cailleret
,
Maxime
,
Calama
,
Rafael A.
,
Calderon
,
Sergio Donoso
,
Camarero
,
Jesús Julio
,
Chang-Yang
,
Chia Hao
,
Chave
,
Jérôme
,
Chianucci
,
Francesco
,
Courbaud
,
Benoít
,
Cutini
,
Andrea
,
Das
,
Adrian J.
,
Delpierre
,
Nicolas
,
Delzon
,
Sylvain
,
Dietze
,
Michael C.
,
Dormont
,
Laurent
,
Espelta
,
Josep Maria
,
Fahey
,
Timothy J.
,
Farfan-Rios
,
William R.
,
Franklin
,
Jerry F.
,
Gehring
,
Catherine A.
,
Gilbert
,
Gregory S.
,
Gratzer
,
Georg
,
Greenberg
,
Cathryn H.
,
Guignabert
,
Arthur
,
Guo
,
Qinfeng
,
Hacket-Pain
,
Andrew J.
,
Hampe
,
Arndt
,
Han
,
Qingmin
,
Holik
,
Jan
,
Hoshizaki
,
K.
,
Ibáñez
,
Inés
,
Johnstone
,
Jill F.
,
Journé
,
Valentin
,
Kitzberger
,
Thomas A.
,
Knops
,
Johannes Michael Hubertus
,
Kunstler
,
Georges
,
Kurokawa
,
Hiroko
,
Lageard
,
Jonathan G.A.
,
LaMontagne
,
Jalene M.
,
Lefèvre
,
François
,
Leininger
,
Theodor D.
,
Limousin
,
Jean Marc
,
Lutz
,
James A.
,
Macias
,
Diana S.
,
Mårell
,
Anders
,
McIntire
,
Eliot J.B.
,
Moore
,
Christopher M.
,
Moran
,
Emily V.
,
Motta
,
Renzo
,
Myers
,
Jonathan A.
,
Nagel
,
Thomas A.
,
Naoe
,
Shoji
,
Noguchi
,
Mahoko
,
Oguro
,
Michio
,
Parmenter
,
Robert R.
,
Pearse
,
Ian S.
,
Pérez-Ramos
,
Ignacio M.
,
Piechnik
,
Łukasz
,
Podgórski
,
Tomasz
,
Poulsen
,
John R.
,
Redmond
,
Miranda D.
,
Reid
,
Chantal D.
,
Rodman
,
Kyle C.
,
Rodríguez-Sánchez
,
Francisco
,
Šamonil
,
Pavel
,
Sanguinetti
,
Javier D.
,
Scher
,
C. Lane
,
Seget
,
Barbara
,
Sharma
,
Shubhi
,
Shibata
,
Mitsue
,
Silman
,
Miles R.
,
Steele
,
Michael A.
,
Stephenson
,
Nathan L.
,
Straub
,
Jacob N.
,
Sutton
,
Samantha
,
Swenson
,
Jennifer J.
,
Swift
,
Margaret
,
Thomas
,
Peter A.
,
Uríarte
,
María
,
Vacchiano
,
Giorgio
,
Whipple
,
Amy Vaughn
,
Whitham
,
Thomas G.
,
Wion
,
Andreas P.
,
Wright
,
Stuart Joseph
,
Zhu
,
Kai
,
Zimmerman
,
Jess K.
,
Żywiec
,
Magdalena
,
Clark
,
James S.
Mostra abstract
The benefits of masting (volatile, quasi-synchronous seed production at lagged intervals) include satiation of seed predators, but these benefits come with a cost to mutualist pollen and seed dispersers. If the evolution of masting represents a balance between these benefits and costs, we expect mast avoidance in species that are heavily reliant on mutualist dispersers. These effects play out in the context of variable climate and site fertility among species that vary widely in nutrient demand. Meta-analyses of published data have focused on variation at the population scale, thus omitting periodicity within trees and synchronicity between trees. From raw data on 12 million tree-years worldwide, we quantified three components of masting that have not previously been analysed together: (i) volatility, defined as the frequency-weighted year-to-year variation; (ii) periodicity, representing the lag between high-seed years; and (iii) synchronicity, indicating the tree-to-tree correlation. Results show that mast avoidance (low volatility and low synchronicity) by species dependent on mutualist dispersers explains more variation than any other effect. Nutrient-demanding species have low volatility, and species that are most common on nutrient-rich and warm/wet sites exhibit short periods. The prevalence of masting in cold/dry sites coincides with climatic conditions where dependence on vertebrate dispersers is less common than in the wet tropics. Mutualist dispersers neutralize the benefits of masting for predator satiation, further balancing the effects of climate, site fertility and nutrient demands. © 2023, The Author(s), under exclusive licence to Springer Nature Limited.
Linking seed size and number to trait syndromes in trees
Bogdziewicz
,
Michał
,
Aravena Acuña
,
Marie Claire
,
Andrus
,
Robert A.
,
Ascoli
,
Davide
,
Bergeron
,
Yves
,
Brveiller
,
Daniel
,
Boivin
,
Thomas
,
Bonal
,
Raúl
,
Caignard
,
Thomas
,
Cailleret
,
Maxime
,
Calama
,
Rafael A.
,
Calderon
,
Sergio Donoso
,
Camarero
,
Jesús Julio
,
Chang-Yang
,
Chia Hao
,
Chave
,
Jérôme
,
Chianucci
,
Francesco
,
Cleavitt
,
Natalie L.
,
Courbaud
,
Benoít
,
Cutini
,
Andrea
,
Curt
,
Thomas
,
Das
,
Adrian J.
,
Davi
,
Hendrik
,
Delpierre
,
Nicolas
,
Delzon
,
Sylvain
,
Dietze
,
Michael C.
,
Dormont
,
Laurent
,
Farfan-Rios
,
William R.
,
Gehring
,
Catherine A.
,
Gilbert
,
Gregory S.
,
Gratzer
,
Georg
,
Greenberg
,
Cathryn H.
,
Guignabert
,
Arthur
,
Guo
,
Qinfeng
,
Hacket-Pain
,
Andrew J.
,
Hampe
,
Arndt
,
Han
,
Qingmin
,
Hoshizaki
,
K.
,
Ibáñez
,
Inés
,
Johnstone
,
Jill F.
,
Journé
,
Valentin
,
Kitzberger
,
Thomas A.
,
Knops
,
Johannes Michael Hubertus
,
Kunstler
,
Georges
,
Kobe
,
Richard K.
,
Lageard
,
Jonathan G.A.
,
LaMontagne
,
Jalene M.
,
Ledwoń
,
Mateusz
,
Leininger
,
Theodor D.
,
Limousin
,
Jean Marc
,
Lutz
,
James A.
,
Macias
,
Diana S.
,
Mårell
,
Anders
,
McIntire
,
Eliot J.B.
,
Moran
,
Emily V.
,
Motta
,
Renzo
,
Myers
,
Jonathan A.
,
Nagel
,
Thomas A.
,
Naoe
,
Shoji
,
Noguchi
,
Mahoko
,
Oguro
,
Michio
,
Kurokawa
,
Hiroko
,
Ourcival
,
Jean Marc
,
Parmenter
,
Robert R.
,
Pérez-Ramos
,
Ignacio M.
,
Piechnik
,
Łukasz
,
Podgórski
,
Tomasz
,
Poulsen
,
John R.
,
Qiu
,
Tong
,
Redmond
,
Miranda D.
,
Reid
,
Chantal D.
,
Rodman
,
Kyle C.
,
Šamonil
,
Pavel
,
Holik
,
Jan
,
Scher
,
C. Lane
,
van Marle
,
Harald Schmidt
,
Seget
,
Barbara
,
Shibata
,
Mitsue
,
Sharma
,
Shubhi
,
Silman
,
Miles R.
,
Steele
,
Michael A.
,
Straub
,
Jacob N.
,
Sun
,
I. Fang
,
Sutton
,
Samantha
,
Swenson
,
Jennifer J.
,
Thomas
,
Peter A.
,
Uríarte
,
María
,
Vacchiano
,
Giorgio
,
Veblen
,
Thomas Thorstein
,
Wright
,
Boyd R.
,
Wright
,
Stuart Joseph
,
Whitham
,
Thomas G.
,
Zhu
,
Kai
,
Zimmerman
,
Jess K.
,
Żywiec
,
Magdalena
,
Clark
,
James S.
Mostra abstract
Aim: Our understanding of the mechanisms that maintain forest diversity under changing climate can benefit from knowledge about traits that are closely linked to fitness. We tested whether the link between traits and seed number and seed size is consistent with two hypotheses, termed the leaf economics spectrum and the plant size syndrome, or whether reproduction represents an independent dimension related to a seed size–seed number trade-off. Location: Most of the data come from Europe, North and Central America and East Asia. A minority of the data come from South America, Africa and Australia. Time period: 1960–2022. Major taxa studied: Trees. Methods: We gathered 12 million observations of the number of seeds produced in 784 tree species. We estimated the number of seeds produced by individual trees and scaled it up to the species level. Next, we used principal components analysis and generalized joint attribute modelling (GJAM) to map seed number and size on the tree traits spectrum. Results: Incorporating seed size and number into trait analysis while controlling for environment and phylogeny with GJAM exposes relationships in trees that might otherwise remain hidden. Production of the large total biomass of seeds [product of seed number and seed size; hereafter, species seed productivity (SSP)] is associated with high leaf area, low foliar nitrogen, low specific leaf area (SLA) and dense wood. Production of high seed numbers is associated with small seeds produced by nutrient-demanding species with softwood, small leaves and high SLA. Trait covariation is consistent with opposing strategies: one fast-growing, early successional, with high dispersal, and the other slow-growing, stress-tolerant, that recruit in shaded conditions. Main conclusions: Earth system models currently assume that reproductive allocation is indifferent among plant functional types. Easily measurable seed size is a strong predictor of the seed number and species seed productivity. The connection of SSP with the functional traits can form the first basis of improved fecundity prediction across global forests. © 2023 John Wiley & Sons Ltd.