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- Title
PHENOLOGICAL PECULIARITIES OF SEED BEARING AND SEED CAST OF SILVER (BETULA PENDULA ROTH.) AND DOWNY (BETULA PUBESCENS EHRH.) BIRCH.
- Authors
Bareika, Vytautas
- Abstract
The studies were conducted in pure birch stands of Central Lithuania (the portion of birches in stand composition -- not less than 10). The study objects were chosen on sites of the most characteristic for silver and downy birches hydrotopes (N, L, U and P). Phenological studies of over three years (2004-2006) were conducted in five 40-70-year old birch stands (three stands of silver birch and two stands of downy birch) growing on sites of similar fertility (c, d). Species identification was done applying chemical (sediments) method, based on the reaction of inner bark with 2,4-dinitrophenylhydrasine (Lundgren et al., 1995). The cast of silver birch seeds begins (when about 10% of seeds are dispersed) on average on 1-5 August, while that of downy birch -- on 14-16 August, i. e. 2 weeks later. Mass seed cast of silver birches (when about 50% of seeds are dispersed) starts on average on 15-18 August, while that of downy birch -- on 25 August--1 September, i. e. also 2 weeks later. The most intensive seed cast of silver birch has been recorded since 30 July till 3 September (about 35 days), while that of downy birch -- from 14 August to 8 September (about 25 days). In other words, the seed cast of downy birch is more intensive, i. e. about 80% of birch seeds fall down over a ten days' shorter period than the seeds of silver birch.
- Subjects
REPUBLIC of Central Lithuania; BIRCH seeds; EUROPEAN white birch; DOWNY birch; COMPOSITION of trees; PLANT phenology; BARK
- Publication
Biologija, 2013, Vol 59, Issue 1, p54
- ISSN
1392-0146
- Publication type
Article