Találati lista | Tudóstér

001-es BibID:	BIBFORM081441
Első szerző:	Deák Balázs (biológus)
Cím:	Micro-topographic heterogeneity increases plant diversity in old stages of restored grasslands / Balázs Deák, Orsolya Valkó, Péter Török, András Kelemen, Tamás Miglécz, Szilárd Szabó, Gergely Szabó, Béla Tóthmérész
Dátum:	2015
ISSN:	1439-1791
Megjegyzések:	It is a truism in ecology that environmental heterogeneity increases diversity. Supporting field studies are mostly concerned with a large-scale topographic heterogeneity, ranging from a couple of metres to landscape-scale gradients. To test the role of fine-scale micro-topography on plant diversity, we studied the initial vegetation of recently filled (1-year-old), and established vegetation on old (7-year-old) soil-filled channels in an alkali landscape, East-Hungary. We hypothesised that (i) recently filled channels are characterised by a high cover of ruderal species and high species diversity and (ii) high micro-topographic heterogeneity increases the diversity of species and plant strategy types (mixed C-S-R categories) in early stages but later on this effect diminishes. We found that diversity of species and plant strategy types was higher in recently filled channels compared to old filled channels. Micro-topographic heterogeneity had no effect on the studied vegetation parameters in recently filled channels. Conversely, in old filled channels higher micro-topographic heterogeneity resulted in higher diversity and lower cover of the dominant grass Festuca pseudovina. Higher micro-topographic heterogeneity resulted in increased ruderality and decreased stress-tolerance, but it did not increase the diversity of plant strategy types. In contrast with former studies, we found that a couple of centimetres of micro-topographic heterogeneity had no effect on vegetation in recently filled channels, but supported a high diversity in old filled channels. An important practical implication of our study is that in grassland restoration projects, micro-topographic heterogeneity has a crucial role in sustaining biodiversity.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Alkali landscape C-S-R strategies Elevation Functional diversity Grassland restoration Plant trait Soil disturbance Succession Topography
Megjelenés:	Basic And Applied Ecology. - 16 : 4 (2015), p. 291-299. -
További szerzők:	Valkó Orsolya (1985-) (biológus) Török Péter (1979-) (biológus-ökológus) Kelemen András (1986-) (biológus-ökológus) Miglécz Tamás (1986-) (biológus ökológus) Szabó Szilárd (1974-) (geográfus) Szabó Gergely (1975-) (geográfus) Tóthmérész Béla (1960-) (ökológus)
Pályázati támogatás:	TÁMOP-4.2.4.A/2-11-1-2012-0001 TÁMOP TÁMOP-4.2.1./B-09/1/KONV- 2010-0007 TÁMOP TÁMOP-4.2.2/B-10/1-2010-0024 TÁMOP TÁMOP-4.2.2/C-11/1/KONV-2012-0010 TÁMOP OTKA PD 100192 OTKA OTKA PD 111807 OTKA
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon:

001-es BibID:	BIBFORM063091
Első szerző:	Varga Katalin
Cím:	Improved land cover mapping using aerial photographs and satellite images / Katalin Varga, Szilárd Szabó, Gergely Szabó, György Dévai, Béla Tóthmérész
Dátum:	2014
ISSN:	2391-5447
Megjegyzések:	Manual Land Cover Mapping using aerial photographsprovides sufficient level of resolution for detailedvegetation or land cover maps. However, in some casesit is not possible to achieve the desired information overlarge areas, for example from historical data where thequality and amount of available images is definitely lowerthan from modern data. The use of automated and semiautomatedmethods offers the means to identify the vegetationcover using remotely sensed data. In this paper automatedmethods were tested on aerial photographs andsatellite images to extract better and more reliable informationabout vegetation cover. These tests were performedby using automated analysis of LANDSAT7 images (withand without the surface model of the Shuttle Radar TopographyMission (SRTM)) and two temporally similar aerialphotographs. The spectral bands were analyzed with supervised(maximum likelihood) methods. In conclusion, the SRTM and the combination of two temporally similar aerial photographs from earlier years were useful in separating the vegetation cover on a floodplain area. In addition the different date of the vegetation season also gave reliable information about the land cover. High quality information about old and present vegetation on a large area is an essential prerequisites ensuring the conservation ofecosystems.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban LANDSAT vegetation season vegetation type maximum likelihood mapping accuracy srtm Doktori iskola
Megjelenés:	Open Geosciences. - 7 : 1 (2014), p. 15-26. -
További szerzők:	Szabó Szilárd (1974-) (geográfus) Szabó Gergely (1975-) (geográfus) Dévai György (1942-) (ökológus) Tóthmérész Béla (1960-) (ökológus)
Pályázati támogatás:	NKFP-3B/0019/2002 Egyéb NKFP 6-00013/2005 Egyéb TÁMOP-4.2.2/B-10/1-2010-0024 TÁMOP Juhász-Nagy Pál Doktori Iskola Bolyai János Kutatási Ösztöndíj Egyéb TÁMOP-4.2.4/A/2-11-1-2012-0001 TÁMOP National Excellence Program
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon: