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ŠUMARSKI LIST 13/2005 str. 182 <-- 182 --> PDF |
PRESENTATION AT THE INTERNATIONAL SYMPOSIUM Šumarski list - SUPLEMENT (2005), 165-185 LYSIMETRIC MONITORING OF SOIL WATER QUALITY IN THE FOREST OF PEDUNCULATE OAK AND COMMON HORNBEAM B. VRBEK, I. PILAŠ, T. DUBRAVAC* SUMM AR Y: Lysimetric research was launched in the Forestry Institute of Jastrebarsko in 1991. The target site was the forest of pedunculate oak and common hornbeam (Carpino bctuli-Quercetum roboris, Anić 1956/emed. Rauš 1969). The quality of soil liquid phase and the amount of deposited matter was monitored in 6plots. ModifiedEbermayer lysimeters were set up in the penological soil profile: below the humus horizon they were placed at depths of10-20 cm and in several plots in the mineral part of the soil at a depth of 100 cm. Sampling was carried out once a month, and anions and cations were identified in the percolate: Kf, Na\ Ca2\ Mg2´, NHf, CI, N03-, S042. After five years of research (from 1995 to 2000) conducted in the area of Repaš, Česma and the Pokupsko basin in the northwest of Croatia, the results of percolate analysis indicated increased deposition quantities in forest ecosystems. Statistical processing revealed the highest amounts of chlorine in the lysimeters placed 10 and 100 cm deep in the Pokupsko basin and Sil]akovina, followed by Cesma and Repaš. The highest amounts qfS04-S were recorded in the lysimeters placed 10 cm in depth in all areas. Repaš takes the lead in this respect, and is followed by Cesma and Pokupsko. An increase in sulphur also occurred in the lysimeters at 100 cm in depth in Pokupsko and Cesma, and less so in Repaš. An increase in NOrN was the highest in the lysimeters placed 10 cm deep the area of Cesma and Pokupsko. The highest increase in sodium and chlorine contents occurred in the lysimeters installed 100 cm deep in the area of Pokupsko-Silj akovina. Compared to all the other measuring sites and plots, this increase was manifold. On average, potassium was the most abundant in the lysimeters placed 10 cm deep in Cesma, and less so in the area of Pokupsko and Repaš. On average, the highest amount of calcium was found in the lysimeters at 100 cm in depth in the area of Cesma, which can be explained by an increased quantity ofCaCO, in the deeper layers of the soil profile. The highest magnesium content was found in the lysimeters placed 100 cm deep in Česma, followed by those placed 10 cm deep. A slightly lower increase occurred in Pokupsko-Siljakovina. According to the calculated ion difference in %, the area of the Pokupsko basin with Siljakovina showed the poorest buffer soil capacity, followed by the Česma watershed. In these areas, acid occurred in lysimeters at depths of 10 cm. There were no negative ion differences in the lysimeters in Repaš, indicating that they are sufficiently buffer active to neutralise acids deposited by dry and wet depositions in the community of pedunculate oak and common hornbeam. Key words: soil, lysimeters, soil solution, forest of pedunculate oak and common hornbeam * Boris Vrbck, PhD, Ivan Pilaš, PhD, Tomislav Dubravac, PhD, Forestry Institute, Jastrebarsko, e-mail: borisv@sumins.hr |