The effect of the shape of gaps on microenvironmental conditions and seedling recruitment in Molinietum caeruleae meadows

• Autorzy: Kostrakiewicz-Gieralt K.

Warianty tytułu

PL

Wpływ kształtu luk na warunki mikrosiedliskowe i rekrutację siewek w płatach Molinietum caeruleae

• Języki publikacji: EN

Abstrakty

EN

Cessation of the management of semi-natural habitats such as grasslands and meadows contributes to secondary succession and encroachment of native and alien tall-growing perennials, large tussock grasses, shrubs, and trees. Thus, the formation of gaps in the plant canopy and litter, enabling seedling recruitment, appears to be a very effective method for the restoration of several plant communities. The main objective of the research was to assess the effect of the shape of openings on microenvironmental conditions and seedling recruitment in Molinietum caeruleae patches in various habitat conditions. In all study patches, circular and linear openings, comparable in area, were randomly created through the removal of plant canopy and litter layer. The circular gaps presented greater light availability and lower soil humidity than linear openings, while soil temperature within differently shaped openings was similar. Regardless of differences in microenvironmental conditions, the total number of seedlings in differently shaped gaps did not vary considerably. Three plant categories were found: (i) those recruited mostly in circular openings, (ii) those recruited mostly in linear gaps, (iii) those colonizing circular and linear gaps similarly. The colonizers of circular gaps represented various synecological groups (ruderal, grasslands and meadows, young tree communities) and diverse life forms (therophytes, hemicryptophytes, chamaephytes, phanerophytes), while the colonizers of linear gaps were meadow and grassland hemicryptophytes. The formation of linear openings contributes to increases in the abundance of meadow taxa, while the creation of circular openings may have a negative effect, contributing to the promotion of the secondary succession process.

PL

Głównym celem prezentowanych badań było zbadanie wpływu kształtu luk na warunki mikrosiedliskowe i rekrutację siewek w płatach łąk Molinietum caeruleae. Obserwacje prowadzono w Krakowie-Kostrzu (Polska Poludniowa) w płatach zdominowanym przez niewielkie gatunki łąkowe (powierzchnia I), ziołorośla i wysokokępowe trawy (powierzchnia II) oraz krzewiaste gatunki wierzb (powierzchnia III). We wszystkich płatach okrągłe i podłużne luki o podobnej powierzchni zostały utworzone przez usunięcie nadziemnych części roślin oraz warstwy ściółki. Okrągłe luki cechowała większa dostępność światła i niższa wilgotność gruntu niż podłużne, natomiast temperatura powierzchni gleby w obu rodzajach odsłonięć była podobna. Niezależnie od warunków siedliskowych całkowita liczba gatunków i siewek w lukach o odmiennym kształcie była zbliżona. W puli siewek stwierdzono gatunki występujące głównie w okrągłych lukach, gatunki pojawiające się przeważnie w prostokątnych lukach, jak również kolonizujące zarówno okrągłe, jak i prostokątne odsłonięcia. Do kolonizatorów okrągłych luk należały gatunki ruderalne, murawowe, łąkowe oraz leśne, reprezentujące różne formy życiowe (od terofitów, przez hemikryptofity i chamefity, do fanerofitów). Kolonizatorami podłużnych luk były łąkowe i murawowe hemikryptofity. W świetle przeprowadzonych badań można wnioskować, że tworzenie podłużnych luk przynosi pożądane efekty, natomiast tworzenie okrągłych odsłonięć może nieść negatywne skutki związane z przyspieszeniem procesu sukcesji wtórnej.

• Wydawca: -
• Czasopismo: Acta Agrobotanica
• Rocznik: 2015
• Tom: 68
• Numer: 2
• Opis fizyczny: p.143-151,fig.,ref.

Twórcy

autor

Kostrakiewicz-Gieralt K.

• Department of Plant Ecology, Institute of Botany, Jagiellonian University, Lubicz 46, 31-512 Krakow, Poland

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Identyfikatory

DOI

10.5586/aa.2015.021