Tiller demography of Festuca pallens Host (Gramineae) in two dry grassland communities

• Autorzy: Janisova Monika
• Języki publikacji: EN

Abstrakty

EN

Tiller demography of a perennial caesposite grass Festuca pallens Host was studied on perm,anent plots in two types of dry grasslands. The field work was done in the Povazsky Inovec Mts. (Western Carpathians) during 1993-1995. The permanent plot in the Poo badensis-Festucentum pallentis was located on a steep, strongly eroded S-facing slope covered with dolomit outcrops, scree and sparse vegetation (20%) dominated by Festuca pallens. The permanent plot in the Festuco pallentis-Caricetum humilis was located on the even ridge planteau with shallow stony soil and vegetation covering about 70% dominated by Carex humilis and Festuca pallens. The aim was to estimate the basic characteristics of tiller life cycle in Festuca pallens: tillering, flowering, mortality and life span. Tillers of Festuca pallens are exclusively intravaginal with a leaf rosette and polycyclic (can live for more than three years). A proximate maximum life span of orthotropic tiller parts was five or six years. The proportion of flowering tillers in the studied populations varied between the years from 3% to 10%. The mortality of tillers due to flowering represented about 50% of the overall tiller mortality. Flowering was mostly accompanied by an intensive pregenerative tillering. Tillering culminated twice a year - in spring and in autumn. About a quarter of the axillary buds developed into daughter tillers immediately after their formation. The fate of tillers in terms of survival, flowering and daughter tiller production can be predicted by their size. Both components of tiller size - leaf number and leaf length - influenced the fate of tillers although the predictive ability was stronger for leaf number. The two studied populations differed significantly in leaf number, leaf length and the height of inflorescences. These characteristics are supposed to be determined by external habitat conditions. The individual tiller life cycle (survival, life span, daughter tiller production) did not differ between the populations, thus the factors by which it is determined seem to be identical. These results support the idea that the basic processes and structures of tiller ontogeny are internally fixed for each species while external environmental conditions can only induce variability in absolute size.

Słowa kluczowe

EN

dry grasslands; tillering

PL

Festuca pallens; kostrzewa blada; rozłogi

• Wydawca: Museum and Institute of Zoology, Polish Academy of Sciences
• Czasopismo: Polish Journal of Ecology
• Rocznik: 2006
• Tom: Vol. 54, nr 2
• Strony: 201--213
• Opis fizyczny: Bibliogr. 35 poz.,Tab., wykr.,

Twórcy

autor

Janisova Monika

• Institute of Botany, Slovak Academy of Sciences, Dúbravská cesta 14, SK-84523 Bratislava, Slovakia

• Institute of Botany6, Slovak Academy of Sciences, Dubravska cesta 14, SK-84523 Bratislava, Slovakia,

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