Contrasting patterns of tree species mixture effects on wood δ13C along an environmental gradient

G. de Streel , C. Collet , I. Barbeito , K. Bielak , A. Bravo‑Oviedo , G. Brazaitis , L. Coll , L. Drössler , D. Forrester , M. Heym , M. Löf , Maciej Pach , H. Pretzsch , R. Ruiz‑Peinado , Jerzy Skrzyszewski , J. Stankevičiūtė , M. Svoboda , K. Verheyen , T. Zlatanov , D. Bonal , Q. Ponette


Establishing mixed-species stands is frequently proposed as a strategy to adapt forests to the increasing risk of water scarcity, yet contrasted results have been reported regarding mixing efects on tree drought exposure. To investigate the drivers behind the spatial and temporal variation in water-related mixing efects, we analysed the δ13C variation in 22-year tree ring chronologies for beech and pine trees sampled from 17 pure and mixed pine–beech stands across a large gradient of environmental conditions throughout Europe. In the pure stands, average δ13C values were lower for beech (−27.9‰ to −22.2‰) than for pine (−26.0‰ to −21.1‰), irrespective of site conditions. Decreasing SPEI values (calculated over June to September) were associated with an increase in δ13C for both species, but their efect was infuenced by stand basal area for pine and site water availability for beech. Mixing did not change the temporal constancy of δ13C nor the tree reaction to a drought event, for any of the species. While the mixing efect (Δ δ13C=δ13C pure stands−δ13C mixed stands) was on average positive for beech and non-signifcant for pine across the whole gradient, this efect strongly difered between sites. For both species, mixing was not signifcant at extremely dry sites and positive at dry sites; on moderately wet sites, mixing was positive for beech and negative for pine; at sites with permanent water supply, no general patterns emerge for any of the species. The pattern of mixing efect along the gradient of water availability was not linear but showed threshold points, highlighting the need to investigate such relation for other combinations of tree species.
Author G. de Streel - Université catholique de Louvain
G. de Streel,,
, C. Collet - Université de Lorraine
C. Collet,,
, I. Barbeito - Swedish University of Agricultural Sciences
I. Barbeito,,
, K. Bielak - Warsaw University of Life Sciences
K. Bielak,,
, A. Bravo‑Oviedo - National Museum of Natural Sciences, Spain
A. Bravo‑Oviedo,,
, G. Brazaitis - Vytautas Magnus University
G. Brazaitis,,
, L. Coll - University of Lleida, Spain
L. Coll,,
, L. Drössler - Ilia State University
L. Drössler,,
, D. Forrester - Snow and Landscape Research WSL, Switzerland
D. Forrester,,
, M. Heym - Technical University of Munich
M. Heym,,
et al.`
Journal seriesEuropean Journal of Forest Research, ISSN 1612-4669, e-ISSN 1612-4677, (N/A 100 pkt)
Issue year2020
Publication size in sheets0.8
Keywords in EnglishStable carbon isotope composition, Species mixture, Fagus sylvatica L., Pinus sylvestris L., Drought
ASJC Classification1107 Forestry; 1110 Plant Science
Languageen angielski
Score (nominal)100
Score sourcejournalList
Publication indicators WoS Citations = 1; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.149; WoS Impact Factor: 2018 = 2.354 (2) - 2018=2.629 (5)
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FinansowanieThe networking in this study has been supported by COST Action FP1206 EUMIXFOR. All contributors thank their national funding institutions to establish, measure and analyse data from the triplets. The main author obtained a PhD grant from the “Fonds National de la Recherche Scientifique” (FNRS-FRIA) and additional funding support from the Walloon forest service (Service Public de Wallonie—Département de la Nature et des Forêts) through the 5-year research programme “Accord-cadre de recherches et de vulgarisation forestières”.
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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