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| IZVORNI ZNANSTVENI ČLANCI |
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| Pilaš, I., Seletković, A. | UDK 630* 181.3 + 581 |
| An Analysis of Groundwater Regime of Lowland Našice Forest Area by Use of Grass Gis
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363 |
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 Nasice forest complex, the Karasica and Vucica 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. According to the distribution of elementary cells in raster maps, two groundwater regimes were distinguished. One characteristic forest area was ascertained in Koška and Đurđenovac, with an average groundwater level of -360 cm, and a second characteristic forest area in Donji Miholjac and Slatina, with an average groundwater level of around – 250cm. Relatively high groundwater levels are characteristic for the region surrounding the Karašica River, and relatively low for the area surrounding the Vucica River. A relationship was also found between the structural characteristics of forest stands on the area under consideration, related soil types and the groundwater regime. The drought period in 2000 was significant especially in area of Donji Miholjac, with a decline of the groundwater table of – 133 cm from five years average.
Key words: GRASS GIS; groundwater; monitoring |
| Trinajstić, I. | UDK 630* 188 |
| Nomenclatural and Syntaxonomic Revision of the Complex “Blechno-Fagetum (Ht. 1950) Ex Marinček 1970” (Luzulo-Fagion)
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375 |
| Zečić, Ž., Poršinsky, T., Šušnjar, M. | UDK 630* 305 + 242 |
| Some Harvesting Results in Hilly Thinning Stands by Group Labor With a Review of Selection of Time Study Method
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381 |
| Prka, M. | UDK 630* 523 (Fagus sylvatica L.) |
| Bark Thicknees of Common Beech (Fagus sylvatica L.) in Cutting Areas of Bilogora near Bjelovar
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391 |
| Krejči, V., Dubravac, T. | UDK 630* 231 + 226 (Quercus ilex L.) |
| From Coppice Wood to High Forest of Evergreen Oak (Quercus Ilex L.) by Shelterwood Cutting
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405 |
| Crnković, S. | UDK 630* 232.3 (Quercus robur L.) |
| Quantitative and Qualitative Properties of Common Oak Acorn (Quercus robur L.) in the Stands of the Basin of the Česma River
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413 |
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| PRETHODNO PRIOPĆENJE |
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| Zelić, J. | UDK 630* 525 (quercus frainetto ten) |
| Preliminary Sortiment Tables for Italian Oak (Quercus Frainetto Ten)
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431 |
