Tree species growth response to climate in mixtures of Quercus robur/Quercus petraea and Pinus sylvestris across Europe - a dynamic, sensitive equilibrium
A random intercept for each triplet and year for Quercus robur and Quercus petraea (top) and Pinus sylvestris (bottom) showing the inter-annual variation in diameter increment on different sites at the logarithmic scale in mm. [Display omitted] •Tree growth reactions to climate are highly site-speci...
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| Published in: | Forest ecology and management 2023-02, Vol.530, p.120753, Article 120753 |
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , |
| Format: | Article |
| Language: | eng |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | A random intercept for each triplet and year for Quercus robur and Quercus petraea (top) and Pinus sylvestris (bottom) showing the inter-annual variation in diameter increment on different sites at the logarithmic scale in mm.
[Display omitted]
•Tree growth reactions to climate are highly site-specific within a bioclimatic zone.•Local (micro)-site conditions outweigh large-scale climatic patterns.•Tree growth reactions to climate are dependent on relative tree size.•Growth sharply declines with increasing potential evapotranspiration in June.•Species identity and mixture effects clearly differ between years at the same site.
Quercus robur/Quercus petraea and Pinus sylvestris are widely distributed and economically important tree species in Europe co-occurring on mesotrophic, xeric and mesic sites. Increasing dry conditions may reduce their growth, but growth reductions may be modified by mixture, competition and site conditions. The annual diameter growth in monospecific and mixed stands along an ecological gradient with mean annual temperatures ranging from 5.5 °C to 11.5 °C was investigated in this study. On 36 triplets (108 plots), trees were cored and the year-ring series were cross-dated, resulting in year-ring series of 785 and 804 trees for Q. spp. and P. sylvestris, respectively. A generalized additive model with a logarithmic link was fit to the data with random effects for the intercept at the triplet, year and tree level and a random slope for the covariate age for each tree; the Tweedie-distribution was used. The final model explained 87 % of the total variation in diameter increment for both tree species. Significant covariates were age, climate variables (long-term mean, monthly), local competition variables, relative dbh, mixture, stand structure and interactions thereof. Tree growth declined with age and local density and increased with social position. It was positively influenced by mixture and structural diversity (Gini coefficient); mixture effects were significant for P. sylvestris only. The influence of potential evapotranspiration (PET) in spring and autumn on tree growth was positive and non-linear, whereas tree growth sharply decreased with increasing PET in June, which proved to be the most influential month on tree growth along the whole ecological gradient. Interactions of PET with tree social position (relative dbh) were significant in July and September for Q. spp. and in April for P. sylvestris. Interactions of climate with d |
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| ISSN: | 0378-1127 1872-7042 1872-7042 |