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  • Elevated ozone prevents acquisition of available nitrogen due to smaller root surface area in poplar
    Mrak, Tanja, 1978- ...
    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.
    Source: Plant and soil. - ISSN 0032-079X (Vol. 450, iss. 1-2, 2020, str. 585-599)
    Type of material - article, component part
    Publish date - 2020
    Language - english
    COBISS.SI-ID - 19207171

    Link(s):

    https://doi.org/10.1007/s11104-020-04510-7
    http://dirros.openscience.si/IzpisGradiva.php?id=12154
    https://link.springer.com/article/10.1007/s11104-020-04510-7
    DiRROS - Digital repository of Slovenian research organizations
    DOI

source: Plant and soil. - ISSN 0032-079X (Vol. 450, iss. 1-2, 2020, str. 585-599)
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