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Article ; Online: Species-mixing effects on crown dimensions and canopy packing in a young pine–birch plantation are modulated by stand density and irrigation

Martin-Blangy, Soline / Meredieu, Céline / Jactel, Hervé / Bonal, Damien / Charru, Marie

Eur J Forest Res. 2023 Feb., v. 142, no. 1 p.197-216

2023

Abstract: Mixed-species plantation forests are of high interest both because of their potentially superior productivity and multi-functionality benefits over monocultures. However, how trees of different species interact at the canopy level in mixed forests ... ...

Abstract	Mixed-species plantation forests are of high interest both because of their potentially superior productivity and multi-functionality benefits over monocultures. However, how trees of different species interact at the canopy level in mixed forests remains unclear, even at young growth stages. We tested whether crown shape and size and stand-level canopy packing were affected by stand composition and how mixture effects varied with stand density and irrigation. We measured crown attributes in pure and mixed plots of two light-demanding species, silver birch (Betula pendula Roth) and maritime pine (Pinus pinaster Ait.), in a 10-year-old tree diversity experiment (ORPHEE). This allowed us to estimate tree-level crown volumes and stand-level canopy packing. We found that (i) at the tree level, stand composition influenced crown-stem allometric relationships in pine but not in birch, (ii) mixture led to greater crown and tree dimensions in pine, but to the opposite for birch, (iii) the changes in crown volume resulted in a higher canopy packing in mixed stands, only at high density and with no irrigation, i.e., under highest constraints for light availability but also soil water availability, contrary to initial expectations. This study sheds light on the effects of water constraints on the aboveground mechanistic processes that explain greater productivity in young mixed plantations, and improves our understanding of canopy packing in mixed stands.
Keywords	Betula pendula ; Pinus pinaster ; allometry ; canopy ; forests ; irrigation ; plant available water ; stand composition ; stand density ; trees
Language	English
Dates of publication	2023-02
Size	p. 197-216.
Publishing place	Springer Berlin Heidelberg
Document type	Article ; Online
ZDB-ID	2134019-5
ISSN	1612-4677 ; 1612-4669
ISSN (online)	1612-4677
ISSN	1612-4669
DOI	10.1007/s10342-022-01511-2
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Large leaf hydraulic safety margins limit the risk of drought‐induced leaf hydraulic dysfunction in Neotropical rainforest canopy tree species

Ziegler, Camille / Levionnois, Sébastien / Bonal, Damien / Heuret, Patrick / Stahl, Clément / Coste, Sabrina

Functional Ecology. 2023 June, v. 37, no. 6 p.1717-1731

2023

Abstract: The sequence of key water potential thresholds from the onset of water stress to mortality, and the timing of stomatal closure with regard to leaf xylem embolism formation are essential to characterizing plant adaptive strategies to drought. This ... ...

Abstract	The sequence of key water potential thresholds from the onset of water stress to mortality, and the timing of stomatal closure with regard to leaf xylem embolism formation are essential to characterizing plant adaptive strategies to drought. This constitutes a critical knowledge gap for tropical rainforest species, which may be less vulnerable to drought than previously thought. We recorded key leaf and stem water potential thresholds, leaf hydraulic safety margins (HSMₗₑₐf), leaf stomatal safety margins (SSMₗₑₐf) and estimated native embolism levels during a normal‐intensity dry season across 18 neotropical rainforest tree species. We also solved a sequence of key water potential thresholds. Additionally, we provide a cross‐biome analysis of SSMₗₑₐf encompassing 97 species from four major biomes based on a literature survey. In the studied rainforest species, leaf turgor loss point, used as a surrogate for stomatal closure, typically occurred before the onset of leaf xylem embolism. Most species exhibited positive HSMₗₑₐf and SSMₗₑₐf, with contrasting values across species and nearly absent embolism levels during the dry season irrespective of the experienced midday leaf water potentials. Our results point out that leaf xylem embolism is not routine for Neotropical rainforest tree species. Based on our proposal of the water potential sequence for tropical rainforest trees, we argue that leaf xylem embolism is a rare event for these species. This was supported by the literature survey, indicating that across biomes, most woody species have rather large SSMₗₑₐf and that leaves of tropical rainforest trees are not necessarily more vulnerable than in other biomes. However, we found evidence that some tropical rainforest species may be more vulnerable than others to ongoing climate change. Our data provide an opportunity to parametrize tree‐based or land‐surface models for tropical rainforests. Read the free Plain Language Summary for this article on the Journal blog.
Keywords	Neotropics ; canopy ; climate change ; drought ; dry season ; embolism ; leaves ; mortality ; risk ; stomatal movement ; surveys ; trees ; tropical rain forests ; turgor ; water potential ; water stress ; woody plants ; xylem
Language	English
Dates of publication	2023-06
Size	p. 1717-1731.
Publishing place	John Wiley & Sons, Ltd
Document type	Article ; Online
Note	JOURNAL ARTICLE
ZDB-ID	2020307-X
ISSN	1365-2435 ; 0269-8463
ISSN (online)	1365-2435
ISSN	0269-8463
DOI	10.1111/1365-2435.14325
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Inferred drought-induced plant allocation shifts and their impact on drought legacy at a tropical forest site.

Worden, Matthew A / Famiglietti, Caroline A / Levine, Paul A / Ma, Shuang / Bloom, A Anthony / Bonal, Damien / Stahl, Clément / Konings, Alexandra G

Global change biology

2024 Volume 30, Issue 5, Page(s) e17287

Abstract: While droughts predominantly induce immediate reductions in plant carbon uptake, they can also exert long-lasting effects on carbon fluxes through associated changes in leaf area, soil carbon, etc. Among other mechanisms, shifts in carbon allocation due ... ...

Abstract	While droughts predominantly induce immediate reductions in plant carbon uptake, they can also exert long-lasting effects on carbon fluxes through associated changes in leaf area, soil carbon, etc. Among other mechanisms, shifts in carbon allocation due to water stress can contribute to the legacy effects of drought on carbon fluxes. However, the magnitude and impact of these allocation shifts on carbon fluxes and pools remain poorly understood. Using data from a wet tropical flux tower site in French Guiana, we demonstrate that drought-induced carbon allocation shifts can be reliably inferred by assimilating Net Biosphere Exchange (NBE) and other observations within the CARbon DAta MOdel fraMework. This model-data fusion system allows inference of optimized carbon and water cycle parameters and states from multiple observational data streams. We then examined how these inferred shifts affected the duration and magnitude of drought's impact on NBE during and after the extreme event. Compared to a static allocation scheme analogous to those typically implemented in land surface models, dynamic allocation reduced average carbon uptake during drought recovery by a factor of 2.8. Additionally, the dynamic model extended the average recovery time by 5 months. The inferred allocation shifts influenced the post-drought period by altering foliage and fine root pools, which in turn modulated gross primary productivity and heterotrophic respiration for up to a decade. These changes can create a bust-boom cycle where carbon uptake is enhanced some years after a drought, compared to what would have occurred under drought-free conditions. Overall, allocation shifts accounted for 65% [45%-75%] of drought legacy effects in modeled NBE. In summary, drought-induced carbon allocation shifts can play a substantial role in the enduring influence of drought on cumulative land-atmosphere CO
MeSH term(s)	Droughts ; French Guiana ; Tropical Climate ; Carbon Cycle ; Forests ; Carbon/metabolism ; Models, Theoretical
Chemical Substances	Carbon (7440-44-0)
Language	English
Publishing date	2024-05-02
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
ZDB-ID	1281439-8
ISSN	1365-2486 ; 1354-1013
ISSN (online)	1365-2486
ISSN	1354-1013
DOI	10.1111/gcb.17287
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Leaf and tree water-use efficiencies of Populus deltoides × P. nigra in mixed forest and agroforestry plantations.

Thomas, Anaïs / Marron, Nicolas / Bonal, Damien / Piutti, Séverine / Dallé, Erwin / Priault, Pierrick

Tree physiology

2022 Volume 42, Issue 12, Page(s) 2432–2445

Abstract: In a global context where water will become a scarce resource under temperate latitudes, managing tree plantations with species associations, i.e., forest mixture or agroforestry, could play a major role in optimizing the sustainable use of this resource. ...

Abstract	In a global context where water will become a scarce resource under temperate latitudes, managing tree plantations with species associations, i.e., forest mixture or agroforestry, could play a major role in optimizing the sustainable use of this resource. Conceptual frameworks in community ecology suggest that, in mixed plantations, environmental resources such as water may be more efficiently used for carbon acquisition and tree growth thanks to niche complementarity among species. To test the hypotheses behind these conceptual frameworks, we estimated water-use efficiency (WUE) for poplar trees grown in a monoculture, in association with alder trees (forest mixture) and in association with clover leys (agroforestry) in an experimental plantation located in northeastern France. Water-use efficiency was estimated (i) at leaf level through gas exchange measurements and analysis of carbon isotope composition, (ii) at wood level through carbon isotope composition and (iii) at tree level with sap flow sensors and growth increment data. We hypothesized that species interactions would increase WUE of poplars in mixtures due to a reduction in competition and/or facilitation effects due to the presence of the N2-fixing species in mixtures. Poplar trees in both mixture types showed higher WUE than those in the monoculture. The differences we found in WUE between the monoculture and the agroforestry treatment were associated to differences in stomatal conductance and light-saturated net CO2 assimilation rate (at the leaf level) and transpiration (at the tree level), while the differences between the monoculture and the forest mixture were more likely due to differences in stomatal conductance at the leaf level and both transpiration and biomass accumulation at the tree level. Moreover, the more WUE was integrated in time (instantaneous gas exchanges < leaf life span < seasonal wood core < whole tree), the more the differences among treatments were marked.
Language	English
Publishing date	2022-07-23
Publishing country	Canada
Document type	Journal Article
ZDB-ID	743341-4
ISSN	1758-4469 ; 0829-318X
ISSN (online)	1758-4469
ISSN	0829-318X
DOI	10.1093/treephys/tpac094
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Elucidating climatic drivers of photosynthesis by tropical forests.

Wang, Yuan / Liu, Junjie / Wennberg, Paul O / He, Liyin / Bonal, Damien / Köhler, Philipp / Frankenberg, Christian / Sitch, Stephen / Friedlingstein, Pierre

Global change biology

2023 Volume 29, Issue 17, Page(s) 4811–4825

Abstract: Tropical forests play a pivotal role in regulating the global carbon cycle. However, the response of these forests to changes in absorbed solar energy and water supply under the changing climate is highly uncertain. Three-year (2018-2021) spaceborne high- ...

Abstract	Tropical forests play a pivotal role in regulating the global carbon cycle. However, the response of these forests to changes in absorbed solar energy and water supply under the changing climate is highly uncertain. Three-year (2018-2021) spaceborne high-resolution measurements of solar-induced chlorophyll fluorescence (SIF) from the TROPOspheric Monitoring Instrument (TROPOMI) provide a new opportunity to study the response of gross primary production (GPP) and more broadly tropical forest carbon dynamics to differences in climate. SIF has been shown to be a good proxy for GPP on monthly and regional scales. Combining tropical climate reanalysis records and other contemporary satellite products, we find that on the seasonal timescale, the dependence of GPP on climate variables is highly heterogeneous. Following the principal component analyses and correlation comparisons, two regimes are identified: water limited and energy limited. GPP variations over tropical Africa are more correlated with water-related factors such as vapor pressure deficit (VPD) and soil moisture, while in tropical Southeast Asia, GPP is more correlated with energy-related factors such as photosynthetically active radiation (PAR) and surface temperature. Amazonia is itself heterogeneous: with an energy-limited regime in the north and water-limited regime in the south. The correlations of GPP with climate variables are supported by other observation-based products, such as Orbiting Carbon Observatory-2 (OCO2) SIF and FluxSat GPP. In each tropical continent, the coupling between SIF and VPD increases with the mean VPD. Even on the interannual timescale, the correlation of GPP with VPD is still discernable, but the sensitivity is smaller than the intra-annual correlation. By and large, the dynamic global vegetation models in the TRENDY v8 project do not capture the high GPP seasonal sensitivity to VPD in dry tropics. The complex interactions between carbon and water cycles in the tropics illustrated in this study and the poor representation of this coupling in the current suite of vegetation models suggest that projections of future changes in carbon dynamics based on these models may not be robust.
Language	English
Publishing date	2023-07-03
Publishing country	England
Document type	Journal Article
ZDB-ID	1281439-8
ISSN	1365-2486 ; 1354-1013
ISSN (online)	1365-2486
ISSN	1354-1013
DOI	10.1111/gcb.16837
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Article ; Online: Residual water losses mediate the trade-off between growth and drought-survival across saplings of 12 tropical rainforest tree species with contrasting hydraulic strategies.

Ziegler, Camille / Cochard, Hervé / Stahl, Clément / Foltzer, Louis / Gérard, Bastien / Goret, Jean-Yves / Heuret, Patrick / Levionnois, Sébastien / Maillard, Pascale / Bonal, Damien / Coste, Sabrina

Journal of experimental botany

2024

Abstract: Knowledge of the physiological mechanisms underlying species vulnerability to drought is critical to better understand patterns of tree mortality. Investigating plant adaptive strategies to drought should thus help to fill this knowledge gap, especially ... ...

Abstract	Knowledge of the physiological mechanisms underlying species vulnerability to drought is critical to better understand patterns of tree mortality. Investigating plant adaptive strategies to drought should thus help to fill this knowledge gap, especially in tropical rainforests exhibiting high functional diversity. In a semi-controlled drought experiment on 12 rainforest tree species, we investigated the diversity in hydraulic strategies and whether they determined the ability of saplings to use stored non-structural carbohydrates during an extreme imposed drought. We further explored the importance of water- and carbon-use strategies in relation to drought-survival through a modelling approach. Hydraulic strategies varied considerably across species with a continuum between dehydration- tolerance and -avoidance. During dehydration leading to hydraulic failure and irrespective of hydraulic strategies, species showed strong declines in whole-plant starch concentrations and a maintenance or even an increase in soluble sugar concentrations potentially favouring osmotic adjustments. Residual water losses mediated the trade-off between time to hydraulic failure and growth, suggesting that it is linked to the 'fast-slow' continuum of plant performances and that dehydration avoidance is an effective drought-survival strategy at the sapling stage. Further investigations on residual water losses may be key to understanding the response of tropical rainforest tree communities to climate change.
Language	English
Publishing date	2024-04-13
Publishing country	England
Document type	Journal Article
ZDB-ID	2976-2
ISSN	1460-2431 ; 0022-0957
ISSN (online)	1460-2431
ISSN	0022-0957
DOI	10.1093/jxb/erae159
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Article: Mixing increases drought exposure through a faster growth in beech, but not in oak

Jacobs, Kristoffel / Bonal, Damien / Collet, Catherine / Muys, Bart / Ponette, Quentin

Forest ecology and management. 2021 Jan. 01, v. 479

2021

Abstract: Promoting mixed forests is often seen as a management option to increase the resilience of forests to droughts. However, mixing can also improve tree growth, and if faster-growing trees use more water, they may be exposed to higher risks of drought. ... ...

Abstract	Promoting mixed forests is often seen as a management option to increase the resilience of forests to droughts. However, mixing can also improve tree growth, and if faster-growing trees use more water, they may be exposed to higher risks of drought. Across Belgium, we tested whether increased tree growth in mixed sessile oak/common beech stands results in increased drought exposure of these forests in severe dry summers. We sampled wood cores from 222 trees in mixed and corresponding pure stands at eight different sites and measured ring widths and stable carbon isotope composition (δ¹³C) in the wood formed during 2001 (wet summer as a reference year) and 2003 (severe dry summer). Pre-drought growth (PG), an index of tree growth in normal climatic conditions, was calculated as the mean ring width in the five years preceding the drought, and drought exposure was assessed as the difference in δ¹³C between the dry and the reference year. Growth of individual beech trees was faster in mixtures and both mixing and pre-drought tree growth were positively related to beech drought exposure. These two effects were not independent: the increased drought exposure in mixed stands was an effect of the faster growth. Analysis of δ¹³C values suggests that in reference conditions, beech trees in mixtures had a less conservative water use than trees in pure stands, but that they shifted to a functioning similar to that in pure stands under drought. By contrast, growth and drought exposure of oak trees did not differ between pure and mixed stands. Our results emphasize the different strategies of these two species regarding their response to mixing and drought. Beech maximizes its growth as a result of greater resource capture in mixed stands, but this increases the risk of suffering from severe droughts. Oak, on the other hand, exhibits lower variability in growth and in drought exposure across pure and mixed stands. We should stress that if mixing is used as a management strategy to mitigate the negative effects of climate change on temperate forests, forest managers should be aware that the performance benefits of mixed forests in non-drought years could in fact hinder the drought resistance of these forests in severe drought years.
Keywords	Fagus ; Quercus petraea ; administrative management ; climate change ; drought ; drought tolerance ; forest ecology ; risk ; stable isotopes ; summer ; tree growth ; wood ; Belgium
Language	English
Dates of publication	2021-0101
Publishing place	Elsevier B.V.
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	751138-3
ISSN	0378-1127
ISSN	0378-1127
DOI	10.1016/j.foreco.2020.118593
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Elucidating climatic drivers of photosynthesis by tropical forests

Wang, Yuan / Liu, Junjie / Wennberg, Paul O. / He, Liyin / Bonal, Damien / Köhler, Philipp / Frankenberg, Christian / Sitch, Stephen / Friedlingstein, Pierre

Global Change Biology. 2023 Sept., v. 29, no. 17 p.4811-4825

2023

Abstract	Tropical forests play a pivotal role in regulating the global carbon cycle. However, the response of these forests to changes in absorbed solar energy and water supply under the changing climate is highly uncertain. Three‐year (2018–2021) spaceborne high‐resolution measurements of solar‐induced chlorophyll fluorescence (SIF) from the TROPOspheric Monitoring Instrument (TROPOMI) provide a new opportunity to study the response of gross primary production (GPP) and more broadly tropical forest carbon dynamics to differences in climate. SIF has been shown to be a good proxy for GPP on monthly and regional scales. Combining tropical climate reanalysis records and other contemporary satellite products, we find that on the seasonal timescale, the dependence of GPP on climate variables is highly heterogeneous. Following the principal component analyses and correlation comparisons, two regimes are identified: water limited and energy limited. GPP variations over tropical Africa are more correlated with water‐related factors such as vapor pressure deficit (VPD) and soil moisture, while in tropical Southeast Asia, GPP is more correlated with energy‐related factors such as photosynthetically active radiation (PAR) and surface temperature. Amazonia is itself heterogeneous: with an energy‐limited regime in the north and water‐limited regime in the south. The correlations of GPP with climate variables are supported by other observation‐based products, such as Orbiting Carbon Observatory‐2 (OCO2) SIF and FluxSat GPP. In each tropical continent, the coupling between SIF and VPD increases with the mean VPD. Even on the interannual timescale, the correlation of GPP with VPD is still discernable, but the sensitivity is smaller than the intra‐annual correlation. By and large, the dynamic global vegetation models in the TRENDY v8 project do not capture the high GPP seasonal sensitivity to VPD in dry tropics. The complex interactions between carbon and water cycles in the tropics illustrated in this study and the poor representation of this coupling in the current suite of vegetation models suggest that projections of future changes in carbon dynamics based on these models may not be robust.
Keywords	carbon ; chlorophyll ; energy ; global carbon budget ; global change ; gross primary productivity ; photosynthesis ; photosynthetically active radiation ; satellites ; soil water ; solar energy ; surface temperature ; tropical forests ; tropics ; troposphere ; vapor pressure deficit ; water supply ; Africa ; Amazonia ; South East Asia
Language	English
Dates of publication	2023-09
Size	p. 4811-4825.
Publishing place	John Wiley & Sons, Ltd
Document type	Article ; Online
Note	JOURNAL ARTICLE
ZDB-ID	1281439-8
ISSN	1365-2486 ; 1354-1013
ISSN (online)	1365-2486
ISSN	1354-1013
DOI	10.1111/gcb.16837
Database	NAL-Catalogue (AGRICOLA)

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Article: Lack of effect of admixture proportion and tree density on water acquisition depth for European beech (Fagus sylvatica L.) and sycamore maple (Acer pseudoplatanus L.)

Fruleux, Alexandre / Bogeat-Triboulot, Marie-Béatrice / Collet, Catherine / Bonal, Damien

Annals of forest science. 2020 June, v. 77, no. 2

2020

Abstract: KEY MESSAGE : In a mixed, Fagus sylvatica L.- Acer pseudoplatanus L., young plantation, trees of both species absorbed water from superficial soil layers despite the presence of roots and water in deeper layers. Admixture proportion and tree density were ...

Abstract	KEY MESSAGE : In a mixed, Fagus sylvatica L.- Acer pseudoplatanus L., young plantation, trees of both species absorbed water from superficial soil layers despite the presence of roots and water in deeper layers. Admixture proportion and tree density were weak predictors of water acquisition depth, as well as fine root vertical distribution, although it might be due to distinct periods of root and isotope investigations. CONTEXT: Promoting mixed forests and reducing stand densities have been proposed as effective ways to maintain the productivity of temperate planted forest stands in a changing climate. AIMS: The objective of this study was to analyse how stand density and the degree of admixture of European beech and sycamore maple interactively influenced the water acquisition profile of individual trees. METHODS: We used a stable isotope (deuterium) approach to determine the profiles of soil water acquisition of both species in a 16-year-old plantation where trees had been planted along crossed gradients of tree density and species proportion. The profiles were then compared with the vertical distribution of fine root of these species in the plantation. RESULTS: All the target trees mostly absorbed soil water from the first few centimetres of soil despite homogenous vertical water availability and the fact that a great part of the fine root biomass was located below 10 cm. Admixture proportion and tree density had negligible effects on soil water acquisition depth. CONCLUSION: No vertical differentiation of soil water acquisition between the two species was observed, suggesting that mixing these species does not promote reduction of belowground competition for resource acquisition. The vertical distribution of fine root may be a weak predictor of water acquisition depth.
Keywords	Acer pseudoplatanus ; Fagus sylvatica subsp. sylvatica ; biomass ; climate change ; deuterium ; fine roots ; forest stands ; mixed forests ; soil water ; spatial distribution ; stable isotopes ; stand density ; trees
Language	English
Dates of publication	2020-06
Size	p. 36.
Publishing place	Springer Paris
Document type	Article
ZDB-ID	1464978-0
ISSN	1297-966X ; 1286-4560
ISSN (online)	1297-966X
ISSN	1286-4560
DOI	10.1007/s13595-020-00937-1
Database	NAL-Catalogue (AGRICOLA)

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Article: Mixing beech with fir or pubescent oak does not help mitigate drought exposure at the limit of its climatic range

Martin-Blangy, Soline / Charru, Marie / Gérard, Sylvain / Jactel, Hervé / Jourdan, Marion / Morin, Xavier / Bonal, Damien

Forest ecology and management. 2021 Feb. 15, v. 482

2021

Abstract: In the context of climate change, it remains unclear whether mixed-species forests will help mitigate the impacts of future droughts and, if so, through which processes. As European beech (Fagus sylvatica L.) is one of the major European species, it is ... ...

Abstract	In the context of climate change, it remains unclear whether mixed-species forests will help mitigate the impacts of future droughts and, if so, through which processes. As European beech (Fagus sylvatica L.) is one of the major European species, it is crucial to evaluate its response to drought when mixed with species with contrasted functional traits and in contrasted climatic conditions, particularly at the limit of its climatic range. This study aimed to (i) characterize the effects of tree species interactions on the drought exposure of beech in south-eastern France, and (ii) determine whether belowground water uptake complementarity underlies these effects. We focused on beech-silver fir (Abies alba Mill.) and beech-pubescent oak (Quercus pubescens Willd.) forests across six sites in the French pre-Alps, a region at the limit of the climatic range for beech. We used a triplet approach to compare the tree-ring carbon isotope composition (δ¹³C) of these species in pure and two-species mixed stands during a period of dry years, and used water hydrogen isotope composition (δ²H) in the xylem to identify water uptake sources. Overall, we found no clear mixture effect pattern on beech physiological functioning among sites and triplets. In beech-fir sites, mixing beech with fir had no effect on beech δ¹³C values during dry years. In beech-oak sites, mixture effects on beech were mostly neutral, although sometimes beech suffered from a stronger exposure to drought in mixed stands. Our study emphasizes the impact of the tree sampling design on the outcome of studies on forest biodiversity-ecosystem functioning relationships. Limiting tree sampling to dominant trees when analyzing stand-level relationships may bias these outcomes. We evidenced differences in water uptake sources between beech and fir, but not between beech and oak during a dry summer. However, these patterns did not help explain the lack of species mixture effects, or existence thereof, at the triplet scale. Our study demonstrates that managing beech in mixed stands with silver fir or pubescent oak at the limit of beech climatic range does not buffer drought impacts on beech during dry years. In the long term, with more frequent extreme droughts, promoting beech-fir mixtures will not be detrimental to beech drought response, while beech may suffer in mixtures with pubescent oak.
Keywords	Abies alba ; Fagus sylvatica subsp. sylvatica ; Quercus pubescens ; administrative management ; carbon ; climate change ; drought ; forest ecology ; growth rings ; summer ; trees ; water uptake ; France
Language	English
Dates of publication	2021-0215
Publishing place	Elsevier B.V.
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	751138-3
ISSN	0378-1127
ISSN	0378-1127
DOI	10.1016/j.foreco.2020.118840
Database	NAL-Catalogue (AGRICOLA)

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