Vukmirović Antonia, Škvorc Željko, Bogdan Saša, Krstonošić Daniel, Bogdan Ida Katičić, Karažija Tomislav, Bačurin Marko, Brener Magdalena, Sever Krunoslav
Faculty of Forestry and Wood Technology, University of Zagreb, Svetošimunska Cesta 23, HR-10000 Zagreb, Croatia.
Faculty of Agriculture, University of Zagreb, Svetošimunska Cesta 25, HR-10000 Zagreb, Croatia.
Plants (Basel). 2024 Aug 15;13(16):2270. doi: 10.3390/plants13162270.
Increasingly frequent and severe droughts pose significant threats to forest ecosystems, particularly affecting photosynthesis, a crucial physiological process for plant growth and biomass production. This study investigates the impact of phosphorus fertilization on the photosynthesis of common beech ( L.) and sessile oak ( (Matt.) Liebl.). In a common garden experiment, saplings originating from two provenances (wetter KA and drier SB provenances) were exposed to regular watering and drought in interaction with moderate and high phosphorus concentrations in the growing substrate. Results indicated that drought significantly reduced pre-dawn leaf water potential (Ψ), net photosynthesis (A), stomatal conductance (g) and photosynthetic performance index (PI) in both species. Phosphorus fertilization had a negative impact on A and PI, thus exacerbating the negative impact of drought on photosynthetic efficiency, potentially due to excessive phosphorus absorption by saplings. Provenance differences were notable, with the KA provenance showing better drought resilience. This research highlights the complexity of nutrient-drought interactions and underscores the need for cautious application of fertilization strategies in reforestation efforts under changing climatic conditions.
日益频繁和严重的干旱对森林生态系统构成重大威胁，尤其影响光合作用，而光合作用是植物生长和生物量生产的关键生理过程。本研究调查了施磷对欧洲山毛榉（L.）和无梗花栎（(Matt.) Liebl.）光合作用的影响。在一个共同园试验中，来自两个种源（较湿润的KA种源和较干燥的SB种源）的树苗，在生长基质中与中等和高磷浓度相互作用的情况下，分别接受常规浇水和干旱处理。结果表明，干旱显著降低了两个树种的黎明前叶水势（Ψ）、净光合作用（A）、气孔导度（g）和光合性能指数（PI）。施磷对A和PI有负面影响，从而加剧了干旱对光合效率的负面影响，这可能是由于树苗过度吸收磷所致。种源差异显著，KA种源表现出更好的抗旱能力。本研究突出了养分 - 干旱相互作用的复杂性，并强调在气候变化条件下的造林工作中谨慎应用施肥策略的必要性。
