20.500.12556/DiRROS-7443 Nekateri ekofiziološki kazalci stresa pri dobu (Quercus robur L.) v severovzhodni Sloveniji Some ecophysiological stress indicators of pedunculate oak (Quercus robur L.) in the north easteren of Slovenia Opazno sušenje in fiziološko pešanje doba (Quercus robur L.) je posebno izrazito v Prekmurju v zadnjem desetletju zaradi sušnega podnebja, neugodne razporeditve padavin in možnih hidromelioracijskih ukrepov. Prispevek obravnava povezavo med vodnim stresom in kazalci vodnih razmer (višina podtalnice, padavine, vodostaji rek Mure in Ledave) ter drugimi kazalci stresa(vodni potencial, električna prevodnost kambijeve cone, osutost krošnje)v gozdnem kompleksu Murska šuma na skrajnem vzhodu Slovenije, kjer stabili izbrani dve ploskvi z različno poškodovanostjo dobovih dreves. Tam smo mesečno določali vodni potencial, električno prevodnost kambijeve cone in osutost krošnje. Meritve so pokazale zvezo med vodnim potencialom in gladino podtalnice, ki je bila na ploskvi z bolj prizadetimi dobovimi drevesi večja, kot na ploskvi z manjšo prizadetostjo. Vzporedno s terenskimi opazovanji je potekal lončni poskus v kontroliranih pogojih na petletnih dobovih sadikah, opravljen v avgustu. Točka začetnega zapiranja listnih rež je bila v intervalu med -0,5 in -0,7 MPa, nepovratno zapiranje pa je povzročil vodni potencial pod (bolj negativen) -1,62 MPa. In the last decade in Prekmurje, there has been a noticeable decline and physiologically weakening of the pedunculate oak (Quercus robur L.) because ofdry climate, unfavourable precipitation patterns and human influence throughchanges in watercourses and the water table. The paper addresses the relationship between water stress of the common oak and indicators of water status in the Murska {uma forest complex (groundwater table, precipitation, water level of the rivers Mura and Ledava) using plant stress indicators such as water potential, electrical resistance of the cambial zone and crown defoliation. Ttwo permanent plots with varying levels in decline in pedunculate oak trees were chosen. Water potential, electrical resistance of cambial zone and defoliation were measured once a month. The measurements showed a relationship of considerable importance between the water potential and groundwater table, which was stronger on plot that showed more intensive decline. At the same time a pot experiment was carried out withfive year common oak seedlings to define water potential at wilting and permanent stomatal closure point. The wilting point was reached at values between -0,5 and -0,7 MPa and permanent stomatal closure was reached below -1,62 MPa. dob Quercus robur (L.) propadanje rastišče vodni režim ksilemski vodni potencial električna upornost kambij kambijeva cona Prekmurje Murska šuma Slovenija pedunculate oak Quercus robur (L.) oak decline site groundwater table xylem water potential electrical resistance cambi Murska šuma Slovenia true false true Slovenski jezik Angleški jezik Neznano 2017-07-12 09:14:31 2017-07-12 09:14:31 2022-08-12 13:47:24 0000-00-00 00:00:00 1999 0 0 str. 47-83 Vol. 58 1999 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630 0351-3114 URN:NBN:SI:doc-UEWAVE6R 504230 6206978 zbgl-58-2.pdf zbgl-58-2.pdf 1 D5E565A5426362D06D19CDD09AD02812 39bb5c28bdba0506209d720b39b87aa13907d7e134adaf7be596d0aa5af9b96f 0fbc67dc-17b5-11ed-b6b8-001a4af901a5 20.500.12556/dirros/a2b192e9-74d5-49b3-9fd6-82b487a2ee2c https://dirros.openscience.si/Dokument.php?lang=slv&id=9294 Gozdarski inštitut Slovenije Acta Silvae et Ligni 0 0 0