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    Wyświetlanie 1-4 z 4
    Tytuł:
    Variation in size-dependent fitness components in a terrestrial orchid, Dactylorhiza majalis (Rchb.) Hunt et Summerh., in relation to environmental factors
    Autorzy:
    Mroz, L.
    Kosiba, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/57438.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    variation
    size-dependent fitness component
    terrestrial orchid
    orchid
    Dactylorhiza majalis
    environmental factor
    European orchid
    total leaf area
    plant size
    flowering probability
    flower production
    threshold size
    plant reproduction
    leaf area
    meadow site
    Polska
    soil nutrient
    plant population
    Opis:
    We investigated the flowering probability and flower production in relation to plant size in a terrestrial orchid, Dactylorhiza majalis at 10 meadow sites in central and southwestern Poland. These sites differed in altitude (low, high) and management (presence or absence of mowing). At all sites, concentrations of nutrients in the soil were also measured. The probability of flowering increased significantly with the size of the plant in all populations, indicating that individuals do not flower until they reach a threshold size. Populations at high altitudes and the unmown sites had significantly lower threshold sizes for reproduction and showed sharp increase in flowering probability with plant size, compared to other populations. The threshold sizes for reproduction tended to decrease at sites rich in N and Mg and poor in P and S. Flower production was also size-dependent in all populations. Considerable between-site differences were found in the slope and the intercept of the regression between plant size and flower production. Flower production at some sites, at high altitudes, increased more steeply with plant size than at other sites. However, no pattern in size-dependent flower production was found relative to the measured environmental variables. Most of the size-dependent components of flowering probability were related to each other but not with the size-dependent flower production.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2011, 80, 2
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    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:
    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
    Tytuł:
    Large-scale vs. small-scale factors affecting flowering patterns in Senecio macrophyllus M.BIEB., a long-lived perennial
    Wielkoskalowe i drobnoskalowe czynniki ksztaltujace wzorce kwitnienia u dlugowiecznej byliny, starca wielkolistnego Senecio macrophyllus M.BIEB.
    Autorzy:
    Czarnecka, B
    Powiązania:
    https://bibliotekanauki.pl/articles/28048.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    small-scale factor
    large-scale factor
    Senecio macrophyllus
    long-lived herbaceous plant
    flowering pattern
    population
    perennial plant
    reproduction
    Opis:
    The aim of the study was to establish which of environmental factors affect flowering patterns in a long-lived herbaceous plant Senecio macrophyllus. The study was conducted in the population of Biała Góra (White Mountain) near Tomaszów Lubelski in the years 1989-2004. The results allow to conclude that in the reproductive patterns of the analysed population small-scale environmental factors (soil moisture and trophism, light intensity) are more important than large-scale climatic factors (temperature, precipitation), which to a comparable extent affect the plants in the whole population area.
    Celem badań było określenie, które z czynników środowiskowych wpływają na kształtowanie się wzorców kwitnienia u długowiecznej rośliny zielnej Senecio macrophyllus. Badania prowadzono w populacji na Białej Górze koło Tomaszowa Lubelskiego w latach 1989-2004. Wyniki pozwalają na stwierdzenie, że w kształtowaniu się wzorców reprodukcji w badanej populacji większe znaczenie mają drobno- skalowe czynniki środowiskowe (wilgotność i trofizm gleby, natężenie światła) niż czynniki wielkoskalowe (temperatura, opady), które w porównywalny sposób oddziałują na rośliny w całym areale populacji.
    Źródło:
    Acta Agrobotanica; 2006, 59, 1
    0065-0951
    2300-357X
    Pojawia się w:
    Acta Agrobotanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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