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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Agriculture / Faculty of Agriculture >
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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 http://creativecommons.org/licenses/by-nc-nd/4.0/ | | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/81109 |
| 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)
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Submitter: 菅井 徹人
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