Találati lista | Tudóstér

001-es BibID:	BIBFORM019221
Első szerző:	Kátai János (biológus, hidrobiológus)
Cím:	A Hortobágy talajai / Kátai János, Novák Tibor József
Dátum:	2010
Megjegyzések:	As a result of geological, physio-geographical and climatic conditions (such as poor drainage, relatively low morphological situation, shallow groundwater level, and its alkaline character, high carbonate content of parent material, which causes the alkalinity and the hydrolysis of soil minerals) 74 % of the Hortobágy is covered by salt affected soils. The alkalinization and the accumulation of salts in the groundwater and in the soils could start 22 000 - 25 000 years ago, when the surface forming rivers left them, and the development of the former floodplain gained a quasi fossilized character. Continuous subsurface water supply, high evaporation in semiarid climate periods of late pleistocene and holocene, and the decreasing of leaching by surface waters turned pedogenesis into alkalinization processes. Although the differences in the elevation are not large (1-2 m/ km2), relief and topography determine the spatial distribution of soil types. The highest surface elements are covered with chernozems, which development was not influenced by groundwater. The most present soil taxa of the Hortobágy are solonetz soils. Ont he basis of the thickness of leached ?A" horizon, sodium adsorption rate (ESP), content of water soluble salts (mostly: Na2CO3, NaHCO3, Na2SO4, but also NaCl) numerous subtypes can be distinguished. Deeper surface forms are covered with meadow soils, which subsoil is often influenced by alkalinization processes. Since the agricultural land use of alkaline soils is very limited, the anthropogenic disturbances and the transformation of soils occurred relatively late. Most of alkaline soils were never ploughed or disturbed in other ways, but changes in soil chemistry caused by water regulations, drainage or chemical reclamation are typical processes of the last decades.
Tárgyszavak:	Természettudományok Környezettudományok magyar nyelvű folyóiratközlemény hazai lapban Hortobágy szikes talajok
Megjelenés:	Acta biologica Debrecina. Supplementum oecologica Hungarica. - 24 : 1 (2010), p. 43-54. -
További szerzők:	Novák Tibor (1973-) (geográfus)
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon:

001-es BibID:	BIBFORM019220
Első szerző:	Novák Tibor (geográfus)
Cím:	A Hortobágy tájföldrajzi jellemzése / Novák Tibor József
Dátum:	2010
Megjegyzések:	As part of the Middle-Tisza region on the Great Hungarian Plain the Hortobágy could be defined as a very shallow basin surrounded by landscapes lying just 3-15 m higher. This shallow basin is open only from the north, wherefrom floods of the Tisza incame to the Hortobágy (until the water regulations), and from the southwest where surface waters could run off into the Berettyó river. The mean elevation of the area is between 87-92 m above the sea level, its extension is 1700 km2. Flat surface, the poverty of geomorphological features and very small elevation differences (meanly 1-3 m/km2) characterize the landscape. The tectonic basin of the Hungarian Great Plain was first filled up with marine and lacustric sediments until the late tercier. Since the ?Pannonian Sea" was filled up, and dried for 5 million years, continued the sedimentation with fluvial and aeolic sediments. Several rivers ? mostly the Sajó and Hernád ? deposited their sandy and silty sediments in the Hortobágy during the pleistocene, and formed typical geomorphological features of floodplains including scour channels, oxbows, point bars, natural levees and backswamps. During interglacials ? warm and wet periods ?the surface was formed by fluvial processes. In ice ages aeolian processes dominated: loess strata covered the fluvial surface. Because of the alteration of fluvial and aeolic surface forming loess was partially washed away, and transported by later fluvial processes (infusion loess). Even since the Tisza cut off the rivers Sajó and Hernád (22 000- 25 000 years BP), it has not developed more as an active floodplain: it became a quasi-fossilized floodplain character. Former geomorphological features were levelled away by the floods of Tisza, but its poor energy and sediment transport could not change significantly the former surface. Negative forms were filled up by local, partially biogenic processes, while positive forms were eroded by stagnant waters and precipitation. On alkaline soils rich microrelief occurs, which is caused by erosion processes of solonetz soils. These erosion processes reduced the elevation differences as well.
Tárgyszavak:	Természettudományok Földtudományok magyar nyelvű folyóiratközlemény hazai lapban Hortobágy geomorphology microrelief erosion of solonetz
Megjelenés:	Acta biologica Debrecina. Supplementum oecologica Hungarica. - 24 : 1 (2010), p. 11-19. -
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon: