Climate Change Data Portal
| DOI | 10.1016/j.soilbio.2024.109319 |
| Nitrogen immobilization could link extreme winter warming events to Arctic browning | |
| 发表日期 | 2024 |
| ISSN | 0038-0717 |
| EISSN | 1879-3428 |
| 起始页码 | 191 |
| 卷号 | 191 |
| 英文摘要 | Arctic extreme winter warming events (WW events) have increased in frequency with climate change. WW events have been linked to damaged tundra vegetation (Arctic browning), but the mechanisms that link episodic winter thaw to plant damage in summer are not fully understood. We suggest that one mechanism is microbial N immobilization during the WW event, which leads to a smaller release of winter-mineralized N in spring and therefore more N limitation for vegetation in summer. We tested this hypothesis in a Western Greenlandic Low arctic tundra, where we experimentally simulated a 6 day field-scale extreme WW event and 1) used stable isotopes to trace the movement of N as a consequence of the WW event, 2) measured the effect of a WW event on spring N release in top soils in the laboratory, and 3) measured the carry-over effect on summer aboveground vegetation C/N ratio in tundra subject to a WW event. Our results show that soil mineral N released by a WW event followed by soil thaw is taken up by microbes and stored in the soil, whereas vascular plants acquired almost none, and significant amounts were lost to leaching and gaseous emissions. As soils thawed in spring, we saw weak but not significant evidence (P = 0.067) for a larger N release over the first month of spring thaw in Control soils compared to WW event soils, although not significantly. A weak signal (P = 0.07) linked WW event treatment to higher summer C/N ratios in evergreen shrubs, whereas deciduous shrubs were not affected. We conclude that our results did not show significant evidence for WW events causing Arctic browning via N immobilization and summer N limitation, but that we had indications (P < 0.1) which merits further testing of the theory in various tundra types and with repeated WW events. Evergreen shrubs could be especially sensitive to winter N immobilization, with implications for future vegetation community composition and tundra C storage. |
| 英文关键词 | Mesic tundra; Greenland; Nitrogen cycling; Climate change; Evergreen shrub |
| 语种 | 英语 |
| WOS研究方向 | Agriculture |
| WOS类目 | Soil Science |
| WOS记录号 | WOS:001183862100001 |
| 来源期刊 | SOIL BIOLOGY & BIOCHEMISTRY
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/290794 |
| 作者单位 | University of Gothenburg; University of Copenhagen; University of Copenhagen; University of Gothenburg; University of Copenhagen |
| 推荐引用方式 GB/T 7714 | . Nitrogen immobilization could link extreme winter warming events to Arctic browning[J],2024,191. |
| APA | (2024).Nitrogen immobilization could link extreme winter warming events to Arctic browning.SOIL BIOLOGY & BIOCHEMISTRY,191. |
| MLA | "Nitrogen immobilization could link extreme winter warming events to Arctic browning".SOIL BIOLOGY & BIOCHEMISTRY 191(2024). |
| 条目包含的文件 | 条目无相关文件。 | |||||
| 个性服务 |
| 推荐该条目 |
| 保存到收藏夹 |
| 导出为Endnote文件 |
| 谷歌学术 |
| 谷歌学术中相似的文章 |
| 百度学术 |
| 百度学术中相似的文章 |
| 必应学术 |
| 必应学术中相似的文章 |
| 相关权益政策 |
| 暂无数据 |
| 收藏/分享 |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
