Growth of Mountain Birch (Betula Pubescens Ehrh.) in Response to Changing Temperature

1993 ◽  
pp. 65-78 ◽  
Author(s):  
Oddvar Skre
Keyword(s):  
Betula Pubescens ◽  
Mountain Birch ◽  
Betula Pubescens Ehrh

Taxonomy of infraspecific variation in Betula pubescens Ehrh., with particular reference to the Scottish Highlands

1984 ◽  
Vol 85 (1-2) ◽  
pp. 13-26 ◽  
Author(s):  
A. S. Gardiner
Keyword(s):  
Multivariate Analysis ◽  
High Frequency ◽  
Betula Pubescens ◽  
Infraspecific Variation ◽  
Scottish Highlands ◽  
Betula Pubescens Ehrh

SynopsisThe variability of the pubescent birch and the probable existence of hybrids between it and two other birches make it a difficult species to classify at an infraspecific level. To some extent, the variation is geographical and to cover its distribution, three subspecies are proposed by the authors of Flora Europaea, sspp. pubescens, carpatica and tortuosa. Two subspecies are recognized in Britain, namely ssp. pubescens and ssp. odorata, but some confusion has arisen through the undetermined relationships between sspp. odorata, carpatica and tortuosa. The rejection of ssp. odorata is proposed as its application, in this case, differs from that intended by J. M. Bechstein, the original authority. An examination of the literature indicates that ssp. tortuosa and ssp. carpatica are probably indistinguishable (a conclusion supported by multivariate analysis) and that the epithet tortuosa can be applied to both taxa. The pubescent birch in the Scottish Highlands may be referred to ssp. tortuosa and, in addition, the high frequency of small-leafed individuals in some populations in the northwest and at higher altitudes, justifies the further distinction of var. microphylla Hartman.

Influence of Copper Oxide and Silver Nanoparticles on Microclonal Sprouts of Downy Birch (Betula pubescens Ehrh.)

2020 ◽  
Vol 15 (7-8) ◽  
pp. 476-482
Author(s):  
P. M. Evlakov ◽  
O. A. Fedorova ◽  
T. A. Grodetskaya ◽  
O. V. Zakharova ◽  
A. A. Gusev ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Copper Oxide ◽  
Betula Pubescens ◽  
Downy Birch ◽  
Betula Pubescens Ehrh

New cyclic diarylheptanoids from the false heartwood of Betula pubescens Ehrh

2021 ◽  
pp. 1-9
Author(s):  
Anastasiia O. Ponkratova ◽  
Dmitry N. Vedernikov ◽  
Andrei K. Whaley ◽  
Maria N. Kuncova ◽  
Sergey N. Smirnov ◽  
...  
Keyword(s):  
Betula Pubescens ◽  
Betula Pubescens Ehrh

Altitudinal Zonation of Geometrid Larvae (Lep.) during a Mass Occurrence on Birch at Sogndal, Western Norway, I967

1972 ◽  
Vol 3 (1) ◽  
pp. 69-74 ◽  
Author(s):  
Sigmund Hagvar
Keyword(s):  
Maximum Density ◽  
Betula Pubescens ◽  
Birch Wood ◽  
Altitudinal Zonation ◽  
Western Norway ◽  
Mass Occurrence ◽  
Betula Pubescens Ehrh ◽  
Different Altitudes ◽  
Made In

AbstractLarvae of Geometridae (Lep.) attacked the birch wood (Betula pubescens Ehrh.) in the mountain slopes near Sogndal, Sogn, in I966 and I967. Collecting of larvae were made in I967 by sweep-netting on five stations at different altitudes up to timber line at 900 m a.s. The maximum density of Operophthera sp., at about 300 m a.s., was estimated to be about five times higher than the maximum density of Oporinia autumnata Bkh. just below the timber line. A horizontal, brownish belt, where the trees were heavily defoliated, extended from approximately 250 to 350 m a.s. The trees near the timber line were not so heavily defoliated. The least defoliated trees were found at about 650-700 m a.s., in the overlapping zone of the two geometrid species. Operophthera sp. was found at all altitudes, while O. autumnata occurred only in the upper half of the birch wood. Erannis aurantiaria Hb. and E. defoliaria Cl. also occurred at all altitudes. The former preferred the lower part of the birch wood, and was always present in densities lower than O. autumnata's highest density. Only a few larvae of E. defoliaria were found, without showing any altitudinal preference.

scholarly journals Effects of Predicted Reduced Summer Rainfall on Growth and Development of Silver Birch (Betula Pendula Roth) and Downy Birch (Betula pubescens Ehrh)

2018 ◽  
Vol 15 ◽  
pp. 28-44
Author(s):  
Dhirendar Kumar Pradhan ◽  
Christine Cahalan ◽  
Sunita Ulak
Keyword(s):  
Climate Change ◽  
Growth And Development ◽  
Betula Pendula ◽  
Global Climate ◽  
Summer Rainfall ◽  
Betula Pubescens ◽  
Silver Birch ◽  
Betula Pendula Roth ◽  
Downy Birch ◽  
Betula Pubescens Ehrh

Climate is one of the major factors that govern the distribution of tree species. Climate change has already affected the growth, structure and distribution of trees and woodlands. Global climate change projections are wetter winters, drier summers and significance changes in temperature regimes in the next few decades. The main objective of this study was to experimentally demonstrate the effects of decline in summer rainfall, as predicted by UKCP09/IPCC, on height and diameter growth in two co-occurring silver birch (Betula pendula Roth) and downy birch (Betula pubescens Ehrh) and provide further understanding of the changes in growth and development in response to a decrease in water availability. One-year-old seedlings were grown in a temperature-controlled greenhouse for eight weeks in a split-plot experimental design. Their height and diameter were measured and analyzed. Result showed that plant height and diameter was significantly reduced with increased water stress. B. pendula showed higher physiological traits indicating that this species can perform better than B. pubescensin water-deficit conditions.

Effects of localized defoliations on female inflorescences in mountain birch, Betula pubescens ssp. tortuosa

1989 ◽  
Vol 67 (2) ◽  
pp. 334-338 ◽  
Author(s):  
Juha Tuomi ◽  
Timo Vuorisalo ◽  
Pekka Niemelä ◽  
Erkki Haukioja
Keyword(s):  
Betula Pubescens ◽  
Mountain Birch ◽  
Final Weight ◽  
Final Length ◽  
Short Shoots ◽  
Leaf Flush ◽  
Biomass Increase

Two experiments were done to test how the removal of foliage from small branches in mountain birch, Betula pubescens spp. tortuosa, may influence the biomass increase of female inflorescences that emerge from reproductive buds on short shoots. First, all the leaves on small twigs were removed shortly after leaf flush in June. Defoliated twigs included on average of five leaves and two reproductive short shoots. Effects of the treatment on the final length and mass of female catkins were studied in August by comparing defoliated twigs to undefoliated ones of the same trees. Second, a similar experiment was carried out by defoliating larger branches with an average of 150 leaves and 56 short shoots and by comparing defoliated branches to adjacent undefoliated branches. The first treatment reduced final weight of inflorescences by about 17% and the second treatment by about 18%. Localized defoliations can thus have limited effects on the biomass increase of female inflorescences. Short shoots are therefore partially autonomous reproductive units that are integrated subunits of higher-level interactive units, e.g., branches, root – shoot subsystems, or entire plants.

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

2015 ◽  
Vol 72 (7) ◽  
pp. 941-953 ◽  
Author(s):  
Annelies Pletsers ◽  
Amelia Caffarra ◽  
Colin T. Kelleher ◽  
Alison Donnelly
Keyword(s):  
Betula Pubescens ◽  
Bud Burst ◽  
Chilling Temperature ◽  
Betula Pubescens Ehrh
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