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Wyszukujesz frazę "plant reproduction" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Influence of environmental factors on reproduction of polar vascular plants
Autorzy:
Kellmann-Sopyla, W.
Pastorczyk, M.
Gielwanowska, I.
Powiązania:
https://bibliotekanauki.pl/articles/11942.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
environmental factor
plant reproduction
polar plant
vascular plant
climate change
generative reproduction
warming
flower development
seed formation
air temperature
ultraviolet radiation
reproductive phase
vegetation
Opis:
In the last few decades, changes of reproductive pattern of polar vascular plants have been observed, for the benefit of generative propagation. The reasons for this phenomenon are attributed to intensively following climate change, whose effects may be various. Warming causes the production of the greater number of generative structures, with higher quality. Our macroscopic observations conducted on specimens of polar vascular plants, cultivated in University of Warmia and Mazury greenhouse, indicate that the effect of temperature increase on flower development and seed formation is inconsistent. On the other hand enhanced levels of UV-B radiation can negatively affect seedlings. The complexity of the climate change causes tremendous difficulties in defining a clear and unquestioned way of modifications during the reproductive phase of the described plants.
Źródło:
Papers on Global Change; 2011, 18
2300-8121
1730-802X
Pojawia się w:
Papers on Global Change
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of dominant species on numbers and age structure of Iris sibirica L. population on blue moor-grass meadow in Southern Poland
Autorzy:
Kostrakiewicz, K
Powiązania:
https://bibliotekanauki.pl/articles/57143.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
generative reproduction
Iris sibirica
clonal plant
vegetative reproduction
Polska
dominant species
age structure
population
blue moor-grass meadow
seedling recruitment
plant ecology
Opis:
Two populations of Iris sibirica, a clonal species protected by law in Poland, occurring in patches of Molinietum caeruleae, of similar floristic composition although with different dominant species, were studied. In the Stanisławice locality, species with a high competitive potential prevailed, contrary to the Opatkowice locality, where the species of low competitive potential dominated. It was established that vegetative propagation ensures the continued presence of populations in both localities, although the proximity of plants with high competitive potential limits the vegetative propagation of ramet clusters of Iris sibirica. Despite the high level of seed production, the recruitment of seedlings in both patches is possible only in artificially created gaps. The field observations support the conclusion that creating gaps allowing for germination of seeds and development of seedlings, as well as eliminating expansive neighbours allowing proliferation of ramet clusters of Iris sibirica, is an affective way of protecting populations of this species.
Źródło:
Acta Societatis Botanicorum Poloniae; 2007, 76, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generative reproduction and external conformation of Echinochloa crus-galli [L.] P. Beauv. plants under various density conditions
Autorzy:
Kucewicz, M.
Holdynski, C.
Powiązania:
https://bibliotekanauki.pl/articles/65545.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
generative reproduction
density condition
individual fertility
external conformation
population fertility
Echinochloa crus-galli
plant
Źródło:
Journal of Plant Protection Research; 2003, 43, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Do small-scale gaps in calcareous grassland swards facilitate seedling establishment?
Autorzy:
Baba, W
Kompala-Baba, A.
Powiązania:
https://bibliotekanauki.pl/articles/57390.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
generative reproduction
grassland
Polska
calcareous grassland
gap colonization
seedling
phenology
plant ecology
germination
Opis:
In this study we analyzed gaps originated in different seasons of the year vs. places of close vegetation in calcareous grasslands in terms of their suitability for seedling germination and establishment. Gaps, irrespective of the time of their origin, significantly promoted seedling emergence as compared with close swards. However, the season of gap creation influenced the rate of seedling germination/emergence. Seedlings occurred more frequently in autumn and spring gaps than in the summer ones. The highest mean number of seedlings and of their species were noted in autumn openings. However, the subsequent survival of seedlings in autumn gaps was low. On the contrary, in spring gaps juveniles occurred with the significantly highest mean number, frequency and species richness. The above results pointed to the positive, although very limited role of artificially created gaps as places favouring seedlings establishment.
Źródło:
Acta Societatis Botanicorum Poloniae; 2005, 74, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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