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001-es BibID:BIBFORM057908
Első szerző:Valkó Orsolya (biológus)
Cím:Environmental factors driving seed bank diversity in alkali grasslands / Orsolya Valkó, Béla Tóthmérész, András Kelemen, Edina Simon, Tamás Miglécz, Balázs András Lukács, Péter Török
Dátum:2014
ISSN:0167-8809
Megjegyzések:For an effective conservation and management in grasslands it is essential to understand mechanismssustaining biodiversity. To gain knowledge is especially crucial in stressed grasslands harbouring a uniqueflora and fauna, like alkali grasslands. Aboveground vegetation, seed bank and environmental factors werestudied in three stands of the following alkali grassland types: (i) Artemisia dry alkali grasslands at highestelevations; (ii) Puccinellia high and (iii) Puccinellia low grasslands at medium to low elevations, and (iv)Juncus wet alkali grasslands at the lowest elevations. We tested the following hypotheses: (i) Seed bankspecies diversity and density are the highest in the most stressed grassland types, where regeneration byseeds could have a major importance in sustaining vegetation diversity. (ii) Seed bank density of hygrophytesincreases with decreasing elevation, because the cover of hygrophytes in the vegetation increaseswith decreasing elevation. The mean seed bank density ranged from 30,104 up to 51,410 seeds/m2, whichis higher than in most dry grasslands. Both the lowest seed bank density and diversity were detected inthe most stressed Puccinellia high grasslands; Spergularia salina was the only abundant seed bank species(possessing at least 1000 seeds/m2). These results not supported our first hypothesis. We detected thehighest seed densities of almost all hygrophyte species in the lowest-elevated Juncus grasslands. But,we did not find a significant monotonous correlation between elevation and the overall hygrophyteseed bank density; because most of the hygrophyte species were missing from the seed bank at themedium-elevated, but most saline Puccinellia grasslands. Thus, our results only partly supported the secondhypothesis. In total we detected more species in the seed bank than in the aboveground vegetationwhich emphasises that seed bank plays an important role in sustaining the diversity of alkali grasslands.However, characteristic graminoids possessed no considerable seed bank, except for Juncus compressus(up to 38,619 seeds/m2). We can conclude that persistence and establishment of most alkali grasslandspecies are not supported by the local persistent seed bank.
Tárgyszavak:Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban
Elevation
Salt marsh
Salinity
Seed density
Seedling emergence
Dispersal
Doktori iskola
Egészség- és Környezettudomány
Megjelenés:Agriculture Ecosystems & Environment. - 182 (2014), p. 80-87. -
További szerzők:Tóthmérész Béla (1960-) (ökológus) Kelemen András (1986-) (biológus-ökológus) Simon Edina (1981-) (ökológus) Miglécz Tamás (1986-) (biológus ökológus) Lukács Balázs András (1979-) (ökológus) Török Péter (1979-) (biológus-ökológus)
Pályázati támogatás:TÁMOP-4.2.2/B-10/1-2010-0024
TÁMOP
Juhász-Nagy Pál Doktori Iskola
TÁMOP-4.2.1/B-09/1/KONV-2010-0007
TÁMOP
Kvantitatív ökológiai kutatások
TÁMOP-4.2.4.A/2-11-1-2012-0001
TÁMOP
PD 100 192
OTKA
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