Ozone exposure alters nutrients and stoichiometric ratios in different organs of four urban tree species despite limited negative effects on leaf physiology and plant growth and biomass

Journal of Forestry Research, Journal Year: 2025, Volume and Issue: 36(1)

Published: Feb. 1, 2025

Abstract To better understand the effects of ground-level ozone (O 3 ) on nutrients and stoichiometry in different plant organs, urban tree species Celtis sinensis , Cyclocarya paliurus Quercus acutissima nuttallii were subjected to a constant exposure charcoal-filtered air (CF), nonfiltered (NF), or NF + 40, 60, 80 nmol O mol –1 (NF40, NF60, NF80) starting early summer growing season. At end summer, net CO 2 assimilation rate ( A ), stomatal conductance g s leaf mass per area (LMA), and/or greenness (SPAD) either not significantly affected by elevated even higher some cases during compared with CF controls. LMA was lower autumn only after highest exposures. Compared NF, NF40 caused large increase across late more K Mn stems. season, nutrient status stoichiometric ratios organs variously altered under stress; many changes often species-specific. Across treatments, primarily associated C Mg levels leaves Ca enriched K, P, Fe, stems, relative NF60 enhanced NF40. Moreover, resulted Ca/Mg ratio Q. only, other regimes. Interestingly, species, stress led modifications (stems branches vs leaves). Thus, ambient exposures can alter dynamics distribution disrupt species-specific manner. Changes reflect an important defense mechanism plants pollution adds risk ecological stoichiometries areas.

Language: Английский

Navigating Biomass Trade-Offs: Earmarking Sustainable Food Security Through Biochar Interventions in Mung Bean Cultivars Under High Ozone Atmosphere

Water Air & Soil Pollution, Journal Year: 2025, Volume and Issue: 236(5)

Published: April 6, 2025

Language: Английский