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1. Pilaš, A. Seletković: ANALIZA REŽIMA PODZEMNIH VODA NAŠ1ČKIH NIZINSKIH ŠUMA ... Šumarski list br. 7-8, CXXVIII (2004), 363-374 osnovu monitoringa podzemnih i površinskih Prpić , B., 1996: Propadanje šuma hrasta lužnjaka. voda u Kupčini, Varoškom lugu, Česmi i TuroHrast lužnjak u Hrvatskoj, HAZU, Hrvatske šupoljskom lugu. Radovi, vol. 28, br. 1: 171-184, me: 274-298, Vinkovci-Zagreb. Prpić, B., I. Jastrebarsko. Anić 2000: The influence of climate and hydro- Mayer , B., 1995: Podzemne i površinske vode u nitechnical developments in the stability of the pezinskoj šumi Turopoljski lug u razdoblju 1989. -duncled oak (Quercus robur L.) stands in Croa1993. godine. Rad. Šum. Inst. Vol. 30 (1): tia. Glas. šum. pokuse 37: 229-240, Zagreb. 47-74, Jastrebarsko. Ratz, Z., M. Bogunović, 1976: Pedološka karta SFRJ 1: 50 000, Donji Miholjac 3. Projektni Mayer , B., 1996: Hidropedološki odnosi na području nizinskih šuma pokupskog bazena. Rad. Šum. savjet za izradu pedološke karte SRH. Inst. Vol. 31 (1/2): 37-89, Jastrebarsko. Ratz, Z., Pavlić, 1976: Pedološka karta SFRJ Mayer , B., G. Bušić , 1996: Utjecaj kolebanja pod1 : 50 000, Podravska Slatina 4. Projektni savjet zemnih i površinskih voda na promjenjivost šiza izradu pedološke karte SRH. rine godova i sušenje hrasta lužnjaka (Quercus Ratz, Z., Ž. Vidaček, 1976: Pedološka karta SFRJ robur L.) u Varoškom lugu, Česmi, Bolčanskom 1: 50 000, Donji Miholjac 4. Projektni savjet za lugu. HŠD, Znanstvena knjiga 1: Unapređenje izradu pedološke karte SRH. proizvodnje biomase šumskih ekosustava: Seletković , Z., 1996: Klima lužnjakovih šuma. 313-326, Zagreb. Hrast lužnjak u Hrvatskoj, HAZU, Hrvatske Neteler, M., H. Mitasova, 2002: Open source šume: 71-82, Vinkovci-Zagreb. GIS: A GRASS G1S approach. Kluwer Academic publishers: 434, Boston, Dordrecht, London. Pilaš, I., B. Vrbek, 2001: Istraživanje utjecaja hidroloških promjena i hidrotehničkih zahvata na tjednu dinamiku radijalnog prirasta hrasta lužnjaka {Quercus robur L.) u Varoškom lugu. Znanost u potrajnom gospodarenju hrvatskim šumama, znanstvena knjiga, 353-366, Zagreb. SUMMARY: This paper presents the results of measurements of groundwater levels on 22 piezometric stations located in northeastern Croatia i. e. area of Našice. The analysed measurement results were collected during a period of five years, 1997-2001. The data were obtained by measurements taken two times a week on piezometric stations consisting of four piezometers at various depths; 0,5 m; 1,3 m; 2,8 m and 7,0 m; in addition, the pressure head was monitored. The predominant soils in the area under consideration are hydromorphic mostly gleysols on Pleistocene loams and clays and gleic luvisol on loess. The pedunculate oak, field ash and black alder forest types are the most common in the area. The main aims of research were to analyze the quantitative aspect of groundwater through the use of GIS and to compare these results with results obtained by measurements of groundwater status in other forest complexes of lowland forests in Croatia. The effect of intense seasonal drought in 2000 on the groundwater table and the regional behavior of groundwater regime in accordance of two rivers situated in the Našice forest complex, the Karasica and Vučica Rivers, were also analyzed. Furthermore, the main structural characteristics of forest stands in the area were compared according to the estimated difference in groundwater regime. The analysis was performed with the aid of GRASS (Geographical Resource Analysis Support System) GIS open source software. The sites were interpolated by IDWA (Inverse distance weighted averages). Some elementary raster map algebra was also performed in order to estimate the groundwater decline during the drought season from five years average. Further analysis was undertaken in the form of histograms of interpolated groundwater raster layers. |