globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13365
论文题名:
Soil warming opens the nitrogen cycle at the alpine treeline
作者: Dawes M.A.; Schleppi P.; Hättenschwiler S.; Rixen C.; Hagedorn F.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:1
起始页码: 421
结束页码: 434
语种: 英语
英文关键词: dissolved organic nitrogen ; European larch ; Larix decidua ; mountain pine ; Pinus uncinata ; stable isotope ; Vaccinium gaultherioides ; Vaccinium myrtillus
Scopus关键词: coniferous tree ; dissolved organic nitrogen ; nitrogen cycle ; shrub ; stable isotope ; treeline ; Switzerland ; Empetrum hermaphroditum ; Larix ; Larix decidua ; Pinus mugo ; Pinus uncinata ; Poaceae ; Vaccinium ; Vaccinium myrtillus
英文摘要: Climate warming may alter ecosystem nitrogen (N) cycling by accelerating N transformations in the soil, and changes may be especially pronounced in cold regions characterized by N-poor ecosystems. We investigated N dynamics across the plant–soil continuum during 6 years of experimental soil warming (2007–2012; +4 °C) at a Swiss high-elevation treeline site (Stillberg, Davos; 2180 m a.s.l.) featuring Larix decidua and Pinus uncinata. In the soil, we observed considerable increases in the (Formula presented.) pool size in the first years of warming (by >50%), but this effect declined over time. In contrast, dissolved organic nitrogen (DON) concentrations in soil solutions from the organic layer increased under warming, especially in later years (maximum of +45% in 2012), suggesting enhanced DON leaching from the main rooting zone. Throughout the experimental period, foliar N concentrations showed species-specific but small warming effects, whereas δ15N values showed a sustained increase in warmed plots that was consistent for all species analysed. The estimated total plant N pool size at the end of the study was greater (+17%) in warmed plots with Pinus but not in those containing Larix, with responses driven by trees. Irrespective of plot tree species identity, warming led to an enhanced N pool size of Vaccinium dwarf shrubs, no change in that of Empetrum hermaphroditum (dwarf shrub) and forbs, and a reduction in that of grasses, nonvascular plants, and fine roots. In combination, higher foliar δ15N values and the transient response in soil inorganic N indicate a persistent increase in plant-available N and greater cumulative plant N uptake in warmer soils. Overall, greater N availability and increased DON concentrations suggest an opening of the N cycle with global warming, which might contribute to growth stimulation of some plant species while simultaneously leading to greater N losses from treeline ecosystems and possibly other cold biomes. © 2016 John Wiley & Sons Ltd
资助项目: We thank many colleagues at the SLF and WSL for their assistance with field and laboratory measurements and for technical support throughout the soil-warming experiment. We are grateful to two anonymous reviewers for providing valuable suggestions for improving the paper. Major funding sources included: the Swiss National Science Foundation from 2007 to 2010 (grant 315200-116861 to CR), an ‘ANR-biodiversité’ grant to SH from 2006 to 2008 ; the Velux foundation from 2007 to 2012 (grant 371 to FH) and the WSL from 2012 to 2014 (grant to CR). Additional financial support was provided by the CCES-ETH Project ‘MOUNTLAND’, Swiss State Secretariat for Education and Research (contributions by FH to COST Actions 639 and ES1203) and the Swiss Federal Office for the Environment.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61170
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作者单位: Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Zürcherstrasse 111, Birmensdorf, Switzerland; WSL Institute for Snow and Avalanche Research – SLF, Flüelastrasse 11, Davos Dorf, Switzerland; Centre d'Ecologie Fonctionnelle & Evolutive (CEFE UMR 5175), CNRS – Université de Montpellier – Université Paul-Valéry Montpellier – EPHE, 1919 route de Mende, Montpellier Cedex 5, France

Recommended Citation:
Dawes M.A.,Schleppi P.,Hättenschwiler S.,et al. Soil warming opens the nitrogen cycle at the alpine treeline[J]. Global Change Biology,2017-01-01,23(1)
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