Effect of accumulated duration of the light period on bud burst in Norway spruce (Picea abies) of varying ages

Partanen, Jouni; Leinonen, Ilkka; Repo, Tapani

doi:10.14214/sf.608

Cited by 37 publications

(26 citation statements)

References 27 publications

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“…Photoperiod thresholds estimated are lower than the ones proposed by Jolly et al (2005) and comparable to those found in many studies focused on the role of photoperiod in forest phenology for boreal species (Heide 1993;Rosenthal and Camm 1997;Partanen et al 1998;Worrall 1999;Partanen et al 2001;Keller and Körner 2003;Repo et al 2004;Wu et al 2004). The observed decrease in photoperiod thresholds can be explained by considering that thresholds values are optimized for a single species (i.e., Fig.…”

Section: Optimization Of Gsi Parameterssupporting

confidence: 84%

“…In the temperate and boreal regions, temperature and photoperiod are considered the main factors influencing plant phenology Linderholm 2006), while at lower latitudes, in Mediterranean and tropical regions, rainfall and evapotranspiration act as important additional factors (Spano et al 1999;Peñuelas et al 2004). In alpine areas, temperature and photoperiod are the main ecological factors influencing phenological events: temperature affects many of the biochemical processes of plants (Levitt 1980;Öquist 1983) and photoperiod greatly influences autumn senescence and, more controversially, spring leaf development (Heide 1993;Worrall 1993;Partanen et al 1998Partanen et al , 2001Häkkinen et al 1998;Worrall 1999;Heide 2003). The accumulation of winter chilling also plays an important role in controlling bud-burst: the degradation of inhibiting hormones and the release of growth-promoting hormones during springtime also appear to be triggered by an accumulation of winter chilling (Schaber and Badeck 2003).…”

Section: Introductionmentioning

confidence: 99%

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European larch phenology in the Alps: can we grasp the role of ecological factors by combining field observations and inverse modelling?

et al. 2008

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Vegetation phenology is strongly influenced by climatic factors. Climate changes may cause phenological variations, especially in the Alps which are considered to be extremely vulnerable to global warming. The main goal of our study is to analyze European larch (Larix decidua Mill.) phenology in alpine environments and the role of the ecological factors involved, using an integrated approach based on accurate field observations and modelling techniques. We present 2 years of field-collected larch phenological data, obtained following a specifically designed observation protocol. We observed that both spring and autumn larch phenology is strongly influenced by altitude. We propose an approach for the optimization of a spring warming model (SW) and the growing season index model (GSI) consisting of a model inversion technique, based on simulated look-up tables (LUTs), that provides robust parameter estimates. The optimized models showed excellent agreement between modelled and observed data: the SW model predicts the beginning of the growing season (B(GS)) with a mean RMSE of 4 days, while GSI gives a prediction of the growing season length (L(GS)) with a RMSE of 5 days. Moreover, we showed that the original GSI parameters led to consistent errors, while the optimized ones significantly increased model accuracy. Finally, we used GSI to investigate interactions of ecological factors during springtime development and autumn senescence. We found that temperature is the most effective factor during spring recovery while photoperiod plays an important role during autumn senescence: photoperiod shows a contrasting effect with altitude decreasing its influence with increasing altitude.

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Section: Optimization Of Gsi Parameterssupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

European larch phenology in the Alps: can we grasp the role of ecological factors by combining field observations and inverse modelling?

et al. 2008

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“…Partanen et al (2001) hypothesised that the promoting effect of light intensity on budburst was caused by the absorbed radiation energy during clear, sunny days. The present results contest this hypothesis, as the observed advance in budburst timing in F. sylvatica, T. cordata and B. pubescens was too large to be attributed to increased bud temperature alone.…”

Section: Effect Of Light Intensitymentioning

confidence: 99%

The ecological significance of phenology in four different tree species: effects of light and temperature on bud burst

2010

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The process of adaptation is the result of stabilising selection caused by two opposite forces: protection against an unfavourable season (survival adaptation), and effective use of growing resources (capacity adaptation). As plant species have evolved different life strategies based on different trade offs between survival and capacity adaptations, different phenological responses are also expected among species. The aim of this study was to compare budburst responses of two opportunistic species (Betula pubescens, and Salix x smithiana) with that of two long-lived, late successional species (Fagus sylvatica and Tilia cordata) and consider their ecological significance. Thus, we performed a series of experiments whereby temperature and photoperiod were manipulated during dormancy. T. cordata and F. sylvatica showed low rates of budburst, high chilling requirements and responsiveness to light intensity, while B. pubescens and S. x smithiana had high rates of budburst, low chilling requirements and were not affected by light intensity. In addition, budburst in B. pubescens and S. x smithiana was more responsive to high forcing temperatures than in T. cordata and F. sylvatica. These results suggest that the timing of growth onset in B. pubescens and S. x smithiana (opportunistic) is regulated through a less conservative mechanism than in T. cordata and F. sylvatica (long-lived, late successional), and that these species trade a higher risk of frost damage for the opportunity of vigorous growth at the beginning of spring, before canopy closure. This information should be considered when assessing the impacts of climate change on vegetation or developing phenological models.

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“…The action of these environmental drivers is complex and changes along the transition from a dormant to a non-dormant state. In addition, it has been shown that photoperiod and temperature interact at various stages during dormancy induction, release and quiescence (Håbjørg 1972, Junttila 1980, Heide 1993, 2003, Myking & Heide 1995, Partanen et al 2001.…”

Section: Introductionmentioning

confidence: 99%

Modelling the timing of Betula pubescens budburst. I. Temperature and photoperiod: a conceptual model

Caffarra¹,

Donnelly²,

Chuine³

et al. 2011

Clim. Res.

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The main factors triggering and releasing bud dormancy are photoperiod and temperature. Their individual and combined effects are complex and change along a transition from a dormant to a non-dormant state. Despite the number of studies reporting the effects of temperature and photoperiod on dormancy release and budburst, information on the parameters defining these relationships is scarce. The aim of the present study was to investigate the effects and interaction of temperature and photoperiod on the rates of dormancy induction and release in Betula pubescens (Ehrh.) in order to develop a conceptual model of budburst for this species. We performed a series of controlled environment experiments in which temperature and photoperiod were varied during different phases of dormancy in B. pubescens clones. Endodormancy was induced by short days and low temperatures, and released by exposure to a minimal period of chilling temperatures. Photoperiod during exposure to chilling temperatures did not affect budburst. Longer exposure to chilling increased growth capability (growth rate at a given forcing temperature) and decreased the time to budburst. During the forcing phase, budburst was promoted by photoperiods above a critical threshold, which was not constant, but decreased upon longer chilling exposures. These relationships between photoperiod and temperature have, as yet, not been integrated into the commonly used processbased phenological models. We suggest models should account for these relationships to increase the accuracy of their predictions under future climate conditions. KEY WORDS: Betula pubescens · Controlled environment experiments · Phenology · Photoperiod · Temperature · Dormancy · Budburst Resale or republication not permitted without written consent of the publisherClim Res 46: [147][148][149][150][151][152][153][154][155][156][157] 2011 1995, Thomas & Vince Prue 1997). The action of these environmental drivers is complex and changes along the transition from a dormant to a non-dormant state. In addition, it has been shown that photoperiod and temperature interact at various stages during dormancy induction, release and quiescence (Håbjørg 1972, Junttila 1980, Heide 1993, 2003, Myking & Heide 1995, Partanen et al. 2001.Photoperiod affects the time at which buds enter a phase of winter rest. Short days (ShDs) signal the onset of winter, which, in turn, triggers decreasing 'growth competence' (growth capability). Once the plant has been exposed to a certain number of dormancyinductive days (dormancy induction requirement), the phase of endodormancy is reached, a period during which buds do not grow even under favourable environmental conditions (Downs & Borthwick 1956, Håb-jørg 1972, Howe et al. 1996, Thomas & Vince Prue 1997, Welling et al. 1997.Chilling temperatures are the main trigger for endodormancy release (Perry 1971, Sarvas 1974, Cannell & Smith 1983, Battey 2000. The concept of 'chilling temperature' is not clearly defined, and a consistent response to chilling has not been ...

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Effect of accumulated duration of the light period on bud burst in Norway spruce (Picea abies) of varying ages

Cited by 37 publications

References 27 publications

European larch phenology in the Alps: can we grasp the role of ecological factors by combining field observations and inverse modelling?

European larch phenology in the Alps: can we grasp the role of ecological factors by combining field observations and inverse modelling?

The ecological significance of phenology in four different tree species: effects of light and temperature on bud burst

Modelling the timing of Betula pubescens budburst. I. Temperature and photoperiod: a conceptual model

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