20.500.12556/DiRROS-12154 Elevated ozone prevents acquisition of available nitrogen due to smaller root surface area in poplar Aims Poplars are ecologically and economically important tree genus, sensitive to ozone (O3). This study aimed to investigate modifying effects of elevated O3 on poplar root response to nutrient addition. Methods In pot experiment, young trees of an O3-sensitive Oxford poplar clone (Populus maximoviczii Henry x berolinensis Dippel) growing in soil with three levels of P (0, 40 and 80 kg ha-1) and two levels of N (0 and 80 kg ha-1) were exposed to three levels of O3 (ambient - AA, 1.5 x AA, 2.0 x AA) at a free air exposure facility. After one growing season, root biomass, fine root (<2 mm) nutrient concentrations and ratios, and fine root morphology were assessed. Results Nitrogen addition resulted in an up to +100.5% increase in coarse and fine root biomass under AA, and only up to +46.3% increase under 2.0 x AA. Elevated O3 and P addition had a positive effect, while N had a negative effect on P concentrations in fine roots. Nitrogen limitation for root growth expressed as a N:P ratio was more pronounced at elevated O3. Nitrogen addition increased root surface area per soil volume by +78.3% at AA and only by +9.9% at 2.0 x AA. Conclusions Smaller root surface area per soil volume at elevated O3 prevented acquisition of available N, rendering N fertilization of young poplar plantations in such conditions economically and environmentally questionable. fine roots nitrogen phosphorus Populusmaximoviczii x berolinensis ozone Poplar drobne korenine ozon dušik topol true false true Angleški jezik Ni določen Neznano 2020-06-16 11:49:47 2020-06-16 11:49:48 2022-08-18 03:35:33 0000-00-00 00:00:00 2020 0 0 Avtorji iz Slovenije: Tanja Mrak, Klemen Eler, Hojka Kraigher; str. 585-599 iss. 1/2 Vol. 450 2020 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 2021-04-23 630*16 0032-079X 10.1007/s11104-020-04510-7 19207171 5659911 RAZ_Mrak_Tanja_i2020.pdf RAZ_Mrak_Tanja_i2020.pdf 1 29AC42BBCB4A24258CE3AC9D39369062 1e2aedaa96921447d657113569cb389f7d05cd412598725b1df1f8c8c3ed6297 3cb896c1-17b6-11ed-b6b8-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=14525 https://link.springer.com/article/10.1007/s11104-020-04510-7 1 https://dirros.openscience.si/Dokument.php?lang=slv&id=14524 Gozdarski inštitut Slovenije 0 0 0