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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
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