The features of silver birch Betula verrucosa Ehrh. and downy birch Betula pubescens Ehrh. seed regeneration in subtaiga and forest-steppe of Western Siberia

The features of silver birch Betula verrucosa Ehrh. and downy birch Betula pubescens Ehrh. seed regeneration in subtaiga and forest-steppe of Western Siberia

Article considers results of long-term studies of birch undergrowth in subtaiga subzone and forest-steppe zone of Western Siberia, the features of silver and downy birch seed regeneration under the canopy of parent stands, on logging, burned and abandoned arable lands, and hayfields. The distance of...

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Bibliographic Details
Main Authors: B. E. Chizhov, R. I. Ivanova, V. A. Shtol, O. A. Kulyasova
Format: Article
Language:English
Published: Russian Academy of Sciences, Siberian Branch Publishing House 2016-12-01
Series:Сибирский лесной журнал
Subjects:
the features of silver and downy birch seed regeneration under the canopy of parent stands
on logging
burned and abandoned arable lands
and hayfields. The distance of seed dispersal by wind
dynamics of accumulation of self-sown birch after continuous tillage and plough furrows is specified. It was found that seed regeneration under the birch stand canopy is hindered by drying of litter and root competition of the parent stand. A necessary condition for the germination of small seeds and the survival of weak shoots of birches is sufficient rainfall during the period of seed production and careful soil treatment
which provides removal of litter
total removal of herbaceous vegetation and soil reserve of weed seeds: continuous repeated plowing
bulldozing strips or shallow plow furrow with 0.7−1.0 m in width
with their additional cultivation. The most effective way of preparing land for seed regeneration of birch trees in arid steppe conditions is to transfer it under temporary cultivation of grain-crops
providing suppression of permanent weeds. Autumn plowing after harvest will provide annual readiness of the site for seed colonization of the birches. When there is an optimum combination of good seed harvest
rainy weather conditions
and appearance of mass self-sown birch
the land is excluded from the agricultural use. Prerequisites: the presence of seed productive walls of birch with preliminary removal of aspen and undesirable forms of birch. In spring of the next year an inventory is done of wintered self-sown birches
at least on 100 evenly spaced accounting plots. If the self-seeding dies
the site continues to be used by agriculture. Less reliable but acceptable is tillage by bulldozer stripes and furrows with 0.7−1.0 m in width
in a year of abundant seed production
Western Siberia
forest steppe
birch
seed reproduction
burns
logging lands
arable lands
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