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Fig. 4 | Annals of Forest Science

Fig. 4

From: Chilling temperature and photoperiod influence the timing of bud burst in juvenile Betula pubescens Ehrh. and Populus tremulaL. trees

Fig. 4

Average thermal time (expressed in degree days >0 °C) to a, b first, c, d 50 % and e, f 100 % bud bursts for Betula pubescens (a, c and e) and Populus tremula (b, d and f) clones subjected to a total of five chilling conditions for B. pubescens (46, 71, 84, 117 and 125 chilling units) and a total of four chilling conditions for P. tremula (33, 60–61, 84 and 103 chilling units). Squares, thermal time to bud burst averaged over conditions with 8–10 h photoperiod, Triangles, thermal time to bud burst averaged over 12–16 h photoperiod. Data are from both experiments 1 and 2

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Annals of Forest Science

ISSN: 1297-966X