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Query: "keywords" (Poplar) .

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Varijabilnost morfoloških svojstava listova europske crne topole i hibridnih crnih topola u klonskom arhivu u Žepču
Mirzeta Memišević Hodžić, Dalibor Ballian, 2023, original scientific article

Abstract: Black poplar (Populus nigra L.) is one of the most important European tree species, inhabiting alluvial habitats along the banks of large rivers. Today, it is one of the most endangered species of forest trees due to habitat devastation, regulation of river flows, excessive exploitation, and the introduction of non-native tree species with which it hybridized. This study aims to determine the variability of morphological properties of black poplar leaves n Bosnia and Herzegovina, within and among populations, and among river basins. Material from the clonal archive of black poplars was researched. The archive was founded in 2005 in Žepče. It contains clones from 161 trees of indigenous black poplars from 26 populations throughout Bosnia and Herzegovina (from the basins of 6 rivers) and 15 hybrid poplar species (table 1 and table 2). Ten leaves were collected from each clone by taking the fifth leaf from the top of the main shoot. Five leaves from each clone were measured. The measurement was performed with a digital movable scale with an accuracy of 0.1 mm and a protractor. The following traits were measured: leaf blade length, leaf blade width, petiole length, total leaf length, the angle between the first lateral nerve and central nerve, and distance from the leaf base to the widest part of the leaf. The number of teeth on one cm above the widest part of the leaf was counted. Data were processed using SPSS 26.0 and EXCEL by populations and river basins. Analysis of variance revealed that there are statistically significant differences among the studied populations (table 4), as well as among river basins (table 7), for all investigated traits. The petiole length trait showed the highest variability, and the lowest variability had the insertion angle of the first lateral and central nerve (table 3). The clones of population of hairy black poplars Čapljina had the lowest values of leaf traits and differed significantly in all measured properties from the others. The most common number of teeth per 1 cm of leaf edge for all populations was four teeth (figure 2), which appeared on 38.3% of leaves. This research gives us a small insight into the morphological characteristics of black poplars in the clone archive Žepče and can be the basis for further researches of the traits of black poplars needed for a successful continuation of work on breeding this species
Keywords: european black poplar, clone archive, morphological traits of laeves
Published in DiRROS: 19.03.2024; Views: 63; Downloads: 33
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Elevated ozone prevents acquisition of available nitrogen due to smaller root surface area in poplar
Tanja Mrak, Klemen Eler, Ovidiu Badea, Yasutomo Hoshika, Elisa Carrari, Elena Paoletti, Hojka Kraigher, 2020, original scientific article

Abstract: 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.
Keywords: fine roots, nitrogen, phosphorus, Populusmaximoviczii x berolinensis, ozone, Poplar
Published in DiRROS: 16.06.2020; Views: 1807; Downloads: 983
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