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

被引:85
作者
Caffarra, Amelia [1 ]
Donnelly, Alison [2 ]
Chuine, Isabelle [3 ]
Jones, Mike B. [2 ]
机构
[1] Fdn Edmund Mach, Res & Innovat Ctr, Agr Area, I-38100 San Michele All Adige, Trento, Italy
[2] Trinity Coll Dublin, Dept Bot, Sch Nat Sci, Dublin 2, Ireland
[3] CEFE CNRS, F-34293 Montpellier, France
关键词
Betula pubescens; Controlled environment experiments; Phenology; Photoperiod; Temperature; Dormancy; Budburst; SPRUCE PICEA-ABIES; BUD BURST; DORMANCY RELEASE; DOUGLAS-FIR; FAGUS-SYLVATICA; ROOTED CUTTINGS; THERMAL TIME; B-PUBESCENS; TREES; GROWTH;
D O I
10.3354/cr00980
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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 process-based phenological models. We suggest models should account for these relationships to increase the accuracy of their predictions under future climate conditions.
引用
收藏
页码:147 / 157
页数:11
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