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- Dox, Inge, et al.
(författare)
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Wood growth phenology and its relationship with leaf phenology in deciduous forest trees of the temperate zone of Western Europe
- 2022
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Ingår i: Agricultural and Forest Meteorology. - : Elsevier. - 0168-1923 .- 1873-2240. ; 327
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Tidskriftsartikel (refereegranskat)abstract
- Wood growth phenology of temperate deciduous trees is less studied than leaf phenology, hindering the understanding of their interaction. In order to describe the variability of wood growth and leaf phenology across locations, species and years, we performed phenological observations of both xylem formation and leaf development in three typical temperate forest areas in Western Europe (Northern Spain, Belgium and Southern Norway) for four common deciduous tree species (Fagus sylvatica L., Betula pendula Roth., Populus tremula L. and Quercus robur L.) in 2018, 2019 and 2020, with only beech and birch being studied in the final year. The earliest cambial reactivation in spring occurred at the Belgian stands while the end of cambial activity and wood growth cessation generally occurred first in Norway. Results did not show much consistency across species, sites or years and lacked general patterns, except for the end of cambial activity, which occurred generally first in birch. For all species, the site variation in phenophases (up to three months) was substantially larger than the inter-annual variability (up to six weeks). The timeline of bud-burst and cambium reactivation, as well as of foliar senescence and cessation of wood growth, were variable across species even with the same type of wood porosity. Our results suggest that wood growth and leaf phenology are less well connected than previously thought. Linear models showed that temperature is the dominant driver of wood growth phenology, but with climate zone also having an effect, especially at the start of the growing season. Drought conditions, on the other hand, have a larger effect on the timing of wood growth cessation. Our comprehensive analysis represents the first large regional assessment of wood growth phenology in common European deciduous tree species, providing not only new fundamental insights but also a unique dataset for future modelling applications.
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| 2. |
- Zuccarini, Paolo, et al.
(författare)
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Drivers and dynamics of foliar senescence in temperate deciduous forest trees at their southern limit of distribution in Europe
- 2023
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Ingår i: Agricultural and Forest Meteorology. - : Elsevier. - 0168-1923 .- 1873-2240. ; 342
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Tidskriftsartikel (refereegranskat)abstract
- Research on autumn phenology is very important for understanding and simulating the future growth of temperate deciduous forests. This is especially needed at the southern edge of the temperate zone, where climate change impacts are particularly intense. We studied foliar senescence timing for mature stands of Fagus sylvatica L., Populus tremula L., Betula pendula Roth, Quercus petraea (Matt.) Liebl. and Quercus robur L. at the southern edge of European temperate forests. First, we analysed long-term series (1997–2019) of senescence timing in southern France. Then, we compared a more detailed four-year dataset (2017–2020) of senescence dynamics and its correlations to meteorological conditions for stands in northern Spain and Belgium, with the latter area representing the core distribution of the species. In contrast to other temperate regions, no significant delaying trends in the timing of autumn phenology were detected in the long-term in southern temperate forests, which were characterized by high inter-site variability. In the short-term (4 years), species-specific correlations with meteorological conditions were found, with, for example, the senescence of F. sylvatica being affected by temperature while the senescence of Q. petraea was affected by both temperature and precipitation. Autumn dynamics differed between the core and southern areas of distribution of the species in the study period. In particular, while late season conditions affected senescence timing in the southern populations, the senescence dynamics of the core populations was mostly influenced by the legacy of spring – early summer conditions and, overall, more affected by precipitation than southern populations. Our data fill important knowledge gaps on the functioning of temperate deciduous forests at the southern limit of distribution in Europe.
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