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Nitrogen loading increases the ozone sensitivity of larch seedlings with higher sensitivity to nitrogen loading

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Title: Nitrogen loading increases the ozone sensitivity of larch seedlings with higher sensitivity to nitrogen loading
Authors: Sugai, Tetsuto Browse this author
Watanabe, Toshihiro Browse this author →KAKEN DB
Kita, Kazuhito Browse this author
Koike, Takayoshi Browse this author →KAKEN DB
Keywords: Ozone sensitivity
Nitrogen loading
Interspecific difference
Hybrid larch F₁
Larix kaempferi
Nitrogen phosphorus ratio
Issue Date: 1-May-2019
Publisher: Elsevier
Journal Title: Science of the total environment
Volume: 663
Start Page: 587
End Page: 595
Publisher DOI: 10.1016/j.scitotenv.2019.01.292
PMID: 30726767
Abstract: Larch (Larix sp.) tree is a critical species for the future afforestation in Northeast Asia. The impacts of elevated concentrations of ground-level ozone (O₃) and nitrogen (N) deposition are raising concerns. However, knowledge of the combined effects of elevated O₃ and N loading are still limited. We investigated whether nitrogen loading mitigates the negative impacts of ozone on two larch species: the Japanese larch (L. kaempferi) and its hybrid larch F₁ (L. gmelinii var. japonica x L. kaempferi) or not. We used open-top cambers and compared responses of the larch seedlings. Results showed the N loading mitigated the negative effects of O₃ on Japanese larch. However, in hybrid larch F₁, N loading did not mitigate O₃-induced inhibition of growth and photosynthetic capacity. Mitigation effect of N loading on negative O₃ impacts may vary between the two Larix spp., Hybrid larch F₁ could be more affected by the combined effects of O₃ and N loading due to its higher growth response to N loading. Elevated O₃ also reduced leaf nitrogen/phosphorus (N/P) ratio by elevated O₃, with significant effects in hybrid larch F₁, particularly under N loading. In the present study, leaf N/P ratio was utilized to validate the hypothesis that a positive effect of N loading may be observed if O₃ does not induce P limitation in Larix spp. We demonstrated a potential leaf N/P ratio function, which could reflect responses to O₃ and N loading in hybrid larch F₁.
Rights: © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 菅井 徹人

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