Hidrológiai Közlöny 2007 (87. évfolyam)

6. szám - XLVIII. Hidrobiológus Napok: Európai elvárások és a hazai hidrobiológia Tihany, 2006. október 4–6.

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j R2 OÖO' R3 inni oo I JJJTljíOIIJ . v' U.'U.Ü UM.',' WM 36 III T1 Ifnfi] 12 «TB HÜ Él LB L0 5. kép. A Foltos-kerti-hullámtér-öblözet 2005. évi állapotát tükröző, Á-NÉR kategóriák alapján készült élőhelytérképe The change of the natural state of the active floodplain area Foltos-kerti-hullámtéröblözet until 61 years Varga, K.', Tóthmérész, B.', Dévai, Gy.

2 'Department of Ecology, Faculty of Natural Sciences, University of Debrecen, Egyetem tér 1, H-4032. Debrecen department of Hydrobiology, Faculty of Natural Sciences, University of Debrecen, Egyetem tér 1, H-403. Debrecen Abstract: A part of the active floodplain on the Upper-Tisza-Region (Foltos-kerti-hullámtéröblözet, NE-Hungary) was studied in 2004 with the Hungarian National General Habitat Classification System ("A-NER"), to assess the natural state of the area. We analysed aerial photographs of these areas from four years (1944, 1995, 2000, 2005) with ArcWiew 3.2. To compare the present and former conditions we had to create a new category-system. We found that the aspect of this area have changed strongly. In 1944 more than 27 % of the area was covered with woodforest. Parallel with the loss of a considerable part of arable lands, the extension of economic forests increased. The percentage of arable lands was largest in 1944 (29,3 %). The ratios of the different habitats in 2005 were: close-to-nature habitats 38 %, agricultural and degraded habitats 6 %, secondary habitats 33 % and economic forests 23 %. Keywords: Upper-Tisza-Region, active floodplain, habitat mapping, ArcWiew, Hungarian National General Habitat Classification System ("Á-NÉR").