title: [Effects of elevated O3 concentration on nitrogen in greening tree species in southern China].
abstract: Numerous studies have indicated that rising ozone (O3) in the troposphere significantly decreased the photosynthesis and the activity of Rubisco enzyme. So it can be inferred that the N uptake and distribution within the plants could be affected by elevated O3. In this study, ten greening woody species, widely distributed in subtropical China, were exposed to charcoal-filtered air (CF, less than 20 nL · L(-1)) and elevated O3 (E-O3, mean concentration of 150 nL · L(-1)) in open top chambers. The results showed that E-O3 significantly reduced the leaves biomass in Liquidamba formosana by 20.9%, the stem biomass in Liriodendron chinense by 21.4%, the root biomass in L. formosana and L. chinense by 24.2% and 32.5%, respectively. E-O3 significantly affected the N concentration in the stem but not those in leaves and root. The N uptakes in the whole tree (Nlu), the leaves and the root were significantly affected by E-O3. Compared to CF, E-O3 significantly reduced the Nlu in L. chinense by 28.4% and Schima superba by 22.7% but significantly increased the Nlu in Neolitsea sericea by 15.5%. Elevated O3 concentration had no significant influence on N distribution within the plants across the selected 10 tree species.
authors.forename: Tian-Tian
authors.initials: TT
authors.lastname: Yang
authors.forename: Wei-Wei
authors.initials: WW
authors.lastname: Zhang
authors.forename: En-Zhu
authors.initials: EZ
authors.lastname: Hu
authors.forename: Xiao-Ke
authors.initials: XK
authors.lastname: Wang
authors.forename: Yuan
authors.initials: Y
authors.lastname: Tian
authors.forename: Zhao-Zhong
authors.initials: ZZ
authors.lastname: Feng
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D018533:Biomass; D002681:China; D009584:Nitrogen / Q000737:chemistry*; D010126:Ozone / Q000032:analysis*; D010788:Photosynthesis; D018515:Plant Leaves; D018517:Plant Roots; D018547:Plant Stems; D014197:Trees / Q000737:chemistry*
chemical_list: D000393:Air Pollutants; D010126:Ozone; D009584:Nitrogen