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| DOI | 10.1007/s00300-024-03240-1 |
| Rethinking the sub-Antarctic terrestrial N-cycle: evidence for organic N acquisition by Marion Island grasses | |
| 发表日期 | 2024 |
| ISSN | 0722-4060 |
| EISSN | 1432-2056 |
| 起始页码 | 47 |
| 结束页码 | 4 |
| 卷号 | 47期号:4 |
| 英文摘要 | Organic N (oN, e.g., amino acids) is an important N-resource for plants in soils replete with oN but not inorganic N (iN; i.e., NH4 + and NO3 -), such as cold ecosystems with temperature-limited soil decomposition rates. However, sub-Antarctic literature assumes that plants only acquire iN, potentially underestimating plant-available N. We hypothesised that Marion Island (- 46.90 degrees, 37.75 degrees) grasses (Polypogon magellanicus, Poa cookii, Agrostis stolonifera and Poa annua) acquire oN and that oN relative to iN provision affects plant growth. We investigated oN and iN uptake and growth responses in two hydroponics experiments. In situ N (15N-glycine, 15NO3 - and 15NH4 +) acquisition was investigated at three field sites with decreasing faunal influence, thus iN input and microbial activity. When plants grown in mire water were supplied with 15N-glycine or 15NO3 -, root delta 15N enrichment was highest for glycine-supplied plants. In the second hydroponics experiment, plant N-uptake rates (nmol g biomass-1 s-1) were significantly higher for glycine than NO3 -, but relative growth rates (g g-1 d-1) lower on glycine. There were species-specific biomass allocation responses to N concentration (4 mM and 0.4 mM) and N-form (glycine and NO3 -). Glycine-supplied grasses at the low iN concentration field sites had significantly higher delta 15N enrichment relative to those at sites with high iN, suggesting higher oN uptake when iN is limiting. We demonstrate the importance of accounting for oN acquisition in the sub-Antarctic. As a system with high soil oN relative to iN, plants may predominantly meet N-demands through oN rather than iN acquisition. |
| 英文关键词 | Nitrogen; Graminoid; Sub-Antarctic; Amino acid; N-cycling; N-uptake; Organic N; Nutrient cycle |
| 语种 | 英语 |
| WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
| WOS类目 | Biodiversity Conservation ; Ecology |
| WOS记录号 | WOS:001195755100001 |
| 来源期刊 | POLAR BIOLOGY
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/303426 |
| 作者单位 | University of Cape Town; Rhodes University; University of Pretoria |
| 推荐引用方式 GB/T 7714 | . Rethinking the sub-Antarctic terrestrial N-cycle: evidence for organic N acquisition by Marion Island grasses[J],2024,47(4). |
| APA | (2024).Rethinking the sub-Antarctic terrestrial N-cycle: evidence for organic N acquisition by Marion Island grasses.POLAR BIOLOGY,47(4). |
| MLA | "Rethinking the sub-Antarctic terrestrial N-cycle: evidence for organic N acquisition by Marion Island grasses".POLAR BIOLOGY 47.4(2024). |
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