3721 KB56 KB193820262016Kobal, MilanLampreht, TadejLampreht, Tadejletnik:74številka:9str. 339-357ISSN:0017-2723COBISSID:4601510URN:URN:NBN:SI:doc-SAAT0CMNslZveza gozdarskih društev SlovenijeGozdarski vestnikerozijski procesigozdarski preventivni ukrepihudourniški procesileseno plavjereka Mežavarstvo pred erozijamivarstvo pred hudournikivodne ujmeLeseno plavje v zgornjem toku Meže| Large woody debris in the upper part of Meža|In the upper course of the Meža River, from its spring (1267 m a.) to the confluence with the Bistra Creek (602 m a.), we systematically measured large woody debris, LWD. In this section, the surface of the contribution area covers 65.2 km2 and the channel is 11.64 km long. For individual pieces of LWD, located in the channel or in the buffer area of 10 m on each side of the channel, we measured the length and diameter at the midpoint. The minimum length of LWD to be evaluated was 0.5 m and the minimum diameter was 10 cm. We also measured coordinates of large woody debris by using GNSS device. Other parameters were also assessed (decay class, po%sition in the river channel, land use and rootiness). Overall, 1673 pieces of wood were examined and their total volume was 145.15 m3. The average LWD density per 100 m of channel length was estimated at 14.4 pieces, or 1,25 m3 in volume. The average length of LWD was 3 m, while the majority of LWD measured from 1.5 to 2.5 m in length. The average diameter was 18 cm and the average volume was 0.09 m3. The results also show that in the river and on its slopes LWD occurs at highly irregular intervals. Our study also revealed that land use, especially forested area, has a strong impact on the presence or absence of LWD in the Meža River. The most important factor for the presence of LWD in the upper course of the Meža River is bank erosion. Predominating LWD was classified into higher stages of decayV zgornjem toku reke Meže smo od njenega izvira (1267 m n. v.) do sotočja z Bistro (602 m n. v.) opravili meritve lesenega plavja. V tem delu površina prispevnega območja zavzema 65,2 km2, dolžina struge znaša 11,64 km. Po%sameznim kosom lesenega plavja, ki so bili v strugi ali v horizontalnem 10 m pasu ob strugi, smo izmerili dolžino in premer na polovici njihove dolžine. V raziskavo smo vključili kose z najmanjšo dolžino 0,5 m in najmanjšim premerom 10 cm. Hkrati smo z GNSS-napravo izmerili koordinate kosov lesenega plavja. Preostale parametre smo ocenili (stopnjo razkroja, položaj v strugi, rabo tal ter ukoreninjenost). Popisali smo 1673 kosov lesenega plavja (v povprečju 14,4 kosa na 100 m struge), ki so skupaj obsegali 145,15 m3 (v povprečju 1,25 m3 na 100 m struge). Prevladovalo je leseno plavje, dolžine od 1,5 do 2,5 m, sicer je bila povprečna dolžina 3 m. Povprečni premer je bil 18 cm, povprečni volumen pa 0,09 m3. Rezultati kažejo, da se leseno plavje v strugi in na njenih pobočjih pojavlja v zelo neenakomernih intervalih. Na razporeditev lesenega plavja najbolj vpliva raba tal ob strugi, zlasti prisotnost gozda. V zgornjem toku reke Meže se leseno plavje najpogosteje vključi zaradi posledic bočne erozije. Prevladujejo kosi lesenega plavja višjih stopenj razkrojaTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaZveza gozdarskih društev Slovenije