Past Trends, Present State and Future Prospects of Hungarian Forest-Steppes

Abstract

In Hungary a countrywide vegetation mapping project carried out between 2003 and 2006 provided immense, detailed data on the current status of the forest-steppe vegetation (MÉTA database). In addition, two fundamentally important historical sources from the late eighteenth century have been analyzed recently. Using these sources we reconstruct and evaluate the past history and current status, and forecast the expected future of the vegetation types within the forest-steppe zone. We show that by the end of the eighteenth century most forest-steppe habitats had undergone considerable change. While steppe woodlands had largely disappeared, large areas of sand steppes and closed steppes on chernozem remained and were used for grazing, some having been degraded into dune areas with windblown sand. As a result of man’s activities, including mechanized land-use, the forest-steppe vegetation underwent great changes during the past 200 years. We review these changes. In the past decades cessation of mowing and grazing is problematic. Presently, approximately 251,000 ha (6.8%) of the total of 3,700,000 ha of forest-steppe vegetation have survived in Hungary, of which only 5.5% of the stands may be considered natural, 38% semi-natural, 46% moderately degraded, and 10% strongly degraded. We predict future trends in the forest-steppe vegetation by evaluating (1) past trends, (2) current threats and regeneration potential, and (3) expected climate change. Important threats are (1) spread of invasive species; (2) abandonment of traditional land-use; (3) drop of the groundwater table due to regulation and draining, (4) plowing; (5) overgrazing; (6) excessive wild game populations; (7) afforestation; and (8) forest management practices. They will lead to further decline and fragmentation of most dry vegetation types, and we predict that steppe woodlands on loess and sand will almost fully disappear in the coming decades, though lack of grazing may lead to the extension of Juniperus-Populus scrub in sand dune areas.