Összesen 3 találat.


001-es BibID:BIBFORM058350
Első szerző:Albert Ágnes Júlia (ökológus)
Cím:Secondary succession in sandy old-fields : a promising example of spontaneous grassland recovery / Ágnes-Júlia Albert, András Kelemen, Orsolya Valkó, Tamás Miglécz, Anikó Csecserits, Tamás Rédei, Balázs Deák, Béla Tóthmérész, Péter Török
Megjegyzések:Question: Based on the spontaneous vegetation development of old-fields in the Nyírség and Kiskunság sand regions (Hungary), we aimed to answer the following questions using the chronosequence method: (1) how do the proportionsof different functional groups change during succession; (2) which target species establish successfully in the old-fields during the course of succession; and (3)how successful is spontaneous succession in the recovery of target grasslands-Location: Two sand regions of the Great Hungarian Plain: (1) the Nyírség sand region (East Hungary, acidic sand, moderately continental climate) and the Kiskunság (Central Hungary, calcareous sand, continental climate).Methods: Altogether 24 old-fieldswere classified into young (<10-yr-old),middle-aged (10-20-yr-old) and late-succession (20-40-yr-old) old-fields; four fields in each age category. For baseline vegetation reference, three open and three closed sand grassland stands in both regions were sampled in the vicinity of the old-fields. The percentage cover of vascular plants was recorded in five 2 X 2-mplots in each field, in early May and late June 2012. We used life forms, clonal spreading traits and Ellenberg indicator values for nutrients in the analysis. Speciesof Festuco-Brometea class were considered as target species.Results: The cover of hemicryptophytes and geophytes increased, the cover of short-lived species decreased with time. Cover of species without clonal spreadingability decreased, while cover of species with clonal spreading ability increased with increasing field age. The cover of invasive species decreased with increasing field age. The majority of target species had established already in the young and middle-aged old-fields, although their cover was significantly higher in the two older age groups.Conclusion: Spontaneous succession can be a vital option in recovery of sand grassland vegetation in Central Europe; the majority of the species pool of sandy grasslands can be recovered in the first 10-20 yrs. However, the success of grassland recovery can be strongly influenced by the surrounding species pool and can be slow if seed dispersal is limited. Spontaneous succession is most promising when the target species of grasslands immigrate at the very beginning of the succession, within the first few years.
Tárgyszavak:Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban
acidic sand
calcareous sand
clonal traits
grassland restoration
spontaneous succession
Megjelenés:Applied Vegetation Science. - 17 : 2 (2014), p. 214-224. -
További szerzők:Kelemen András (1986-) (biológus-ökológus) Valkó Orsolya (1985-) (biológus) Miglécz Tamás (1986-) (biológus ökológus) Csecserits Anikó Rédei Tamás Deák Balázs (1978-) (biológus) Tóthmérész Béla (1960-) (ökológus) Török Péter (1979-) (biológus-ökológus)
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001-es BibID:BIBFORM083396
Első szerző:Kelemen András (biológus-ökológus)
Cím:Net outcome of competition and facilitation in a wet meadow changes with plant's life stage and community productivity / Kelemen András, Lorenzo Lazzaro, Besnyői Vera, Albert Ágnes-Júlia, Marie Konečná, Dobay Gergely, Memelink Ilse, Vojtěch Adamec, Lars Götzenberger, Francesco de Bello, Yoann Le Bagousse-Pinguet, Jan Lepš
Megjegyzések:Positive and negative plant-plant interactions generally co-occur in communities but their relative importance should depend on site productivity; the importance of facilitation is expected to increase and that of competition to decrease with the adversity of the environment. Moreover the effect of surrounding vegetation on an individual's performance can vary depending on the individual's life stage and on the variables used to characterize an individual's performance. To test these theories, we established a transplant experiment in a wet meadow in order to assess the effects of surrounding vegetation on individual plants under varying environmental conditions and changes in these effects during an individual's development within one growing season. We asked whether (i) the net effects of plant interactions differ with differences in productivity and disturbance, and (ii) the net effects of interactions differ according to life stage, species and the performance measure used. We utilized a long-term experiment with three treatments (application of fertilizer, mowing and removal of the dominant species) in a full factorial design, yielding eight combinations, with three replicate plots per combination. In each plot four individuals of three species (Lysimachia vulgaris, Prunella vulgaris and Plantago lanceolata) were transplanted, two into gaps and two into intact vegetation. Survival (alive/dead) of each individual was recorded twice during the season. The presence of flowers and above- and below-ground biomass were recorded at the end of the transplant experiment. The survival of transplants early in the season was higher when growing among vegetation, indicating that at an early stage in its life the net effect of the surrounding vegetation was positive. At later stages, competition became more important and had a negative effect on biomass production and plant reproduction. This negative effect was more pronounced in fertilized plots while the effect of mowing and removal of dominant species on plant interactions was generally negligible. Our results indicate, particularly under more productive conditions, the importance of changes in the net outcome of plant interactions during different life stages, highlighting the dynamic nature of positive and negative interactions within a community.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
above-ground biomass
Molinia removal
ontogenetic shift
plant-plant interactions
root-shoot ratio
Megjelenés:Preslia. - 87 : 4 (2015), p. 347-361. -
További szerzők:Lazzaro, Lorenzo Besnyői Vera Albert Ágnes Júlia (1986-) (ökológus) Konečná, Marie Dobay Gergely Ilse, Memelink Adamec, Vojtěch Götzenberger, Lars Bello, Francesco de Le Bagousse-Pinguet, Yoann Lepš, Jan
Pályázati támogatás:GACR 13-17118S
TÁMOP 4.2.4. A/2-11-1-2012-0001
Postdoc USB project - CZ.1.07/2.3.00/30.0006
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001-es BibID:BIBFORM058385
035-os BibID:(Scopus)84885014244
Első szerző:Török Péter (biológus-ökológus)
Cím:New thousand-seed weight records of the Pannonian flora and their application in analysing social behaviour types / P. Török, T. Miglécz, O. Valkó, K. Tóth, A. Kelemen, Á.-J. Albert, G. Matus, A. Molnár V., E. Ruprecht, L. Papp, B. Deák, O. Horváth, A. Takács, B. Hüse, B. Tóthmérész
Megjegyzések:In the present paper we report original thousand-seed weight data for the flora of the PannonianBasin. Our goal was to demonstrate the usefulness of seed weight databases by analysingseed weight data in relation to social behaviour types and life forms. We specificallyasked the following questions: (i) how the seed weights are related to social behaviourtype categories; (ii) how the life form of the species influences seed weight differencesbetween respective social behaviour types? Own weight measurements are provided for1,405 taxa; and for 187 taxa we published seed weight data for the first time: these weremostly endemics, orchids and/or species with Pontic, Caspian or continental distribution.Several taxonomic or functional groups are underrepresented in our database, like aquaticplants, rare arable weeds and sub-Mediterranean species. Problematic taxa, some difficultto-harvest species or species with low seed production and cultivated adventives are alsounderrepresented. We found that the plant strategies expressed by social behaviour types were significantly different in terms of seed weights. The lowest seed weight scores werefound for natural pioneers, whereas the highest ones were found for adventives and introducedcultivated plants. Short-lived herbaceous species had significantly higher seedweight scores than herbaceous perennials. No significant differences were found betweenspecialists and generalists within the stress tolerant group. We found that short-livedgraminoids possess heavier seeds than perennial graminoids, perennial and annual forbs.Naturalness scores were negatively correlated with seed weights. Our findings showedthat seed collections and databases are not only for storing plant material and seed weightdata, but can be effectively used for understanding ecological trends and testing planttrait-based hypotheses. Even the identified gaps underline the necessity of further seedcollection and measurements.
Tárgyszavak:Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban
life form
pioneer species
plant trait
seed mass
Megjelenés:Acta Botanica Hungarica. - 55 : 3-4 (2014), p. 429-472. -
További szerzők:Miglécz Tamás (1986-) (biológus ökológus) Valkó Orsolya (1985-) (biológus) Tóth Katalin (1988-) (biológus) Kelemen András (1986-) (biológus-ökológus) Albert Ágnes Júlia (1986-) (ökológus) Matus Gábor (1968-) (botanikus) Molnár V. Attila (1969-) (biológus, botanikus) Ruprecht Eszter Papp László (1958-) (biológus, botanikus) Deák Balázs (1978-) (biológus) Horváth Orsolya Takács Attila (1989-) (biológus, botanikus) Hüse Bernadett (1982-) (biológus) Tóthmérész Béla (1960-) (ökológus)
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