Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13365 |
Soil warming opens the nitrogen cycle at the alpine treeline | |
Dawes, Melissa A.1,2; Schleppi, Patrick1; Hattenschwiler, Stephan3; Rixen, Christian2; Hagedorn, Frank1 | |
2017 | |
发表期刊 | GLOBAL CHANGE BIOLOGY |
ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2017 |
卷号 | 23期号:1 |
文章类型 | Article |
语种 | 英语 |
国家 | Switzerland; France |
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 degrees 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 NH4+ 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 delta N-15 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 delta N-15 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. |
英文关键词 | dissolved organic nitrogen European larch Larix decidua mountain pine Pinus uncinata stable isotope Vaccinium gaultherioides Vaccinium myrtillus |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000390218300035 |
WOS关键词 | DISSOLVED ORGANIC-CARBON ; SIMULATED CLIMATE-CHANGE ; MYCORRHIZAL FUNGI ; CO2 ENRICHMENT ; N-15 ABUNDANCE ; ELEVATED CO2 ; FOREST ; PLANTS ; RESPONSES ; AVAILABILITY |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17538 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Swiss Fed Inst Forest Snow & Landscape Res WSL, Zurcherstr 111, CH-8903 Birmensdorf, Switzerland; 2.WSL Inst Snow & Avalanche Res SLF, Fluelastr 11, CH-7260 Davos, Switzerland; 3.Univ Paul Valery Montpellier, EPHE, Univ Montpellier, CEFE,UMR 5175,CNRS, 1919 Route Mende, F-34293 Montpellier 5, France |
推荐引用方式 GB/T 7714 | Dawes, Melissa A.,Schleppi, Patrick,Hattenschwiler, Stephan,et al. Soil warming opens the nitrogen cycle at the alpine treeline[J]. GLOBAL CHANGE BIOLOGY,2017,23(1). |
APA | Dawes, Melissa A.,Schleppi, Patrick,Hattenschwiler, Stephan,Rixen, Christian,&Hagedorn, Frank.(2017).Soil warming opens the nitrogen cycle at the alpine treeline.GLOBAL CHANGE BIOLOGY,23(1). |
MLA | Dawes, Melissa A.,et al."Soil warming opens the nitrogen cycle at the alpine treeline".GLOBAL CHANGE BIOLOGY 23.1(2017). |
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