globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13450
论文题名:
Decomposition nitrogen is better retained than simulated deposition from mineral amendments in a temperate forest
作者: Nair R.K.F.; Perks M.P.; Mencuccini M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:4
起始页码: 1711
结束页码: 1724
语种: 英语
英文关键词: 15N-nitrogen ; forest ; isotope trace ; litter decomposition ; litter nitrogen ; nitrogen fertilization
Scopus关键词: Picea sitchensis
英文摘要: Nitrogen (N) deposition (NDEP) drives forest carbon (C) sequestration but the size of this effect is still uncertain. In the field, an estimate of these effects can be obtained by applying mineral N fertilizers over the soil or forest canopy. A 15N label in the fertilizer can be then used to trace the movement of the added N into ecosystem pools and deduce a C effect. However, N recycling via litter decomposition provides most of the nutrition for trees, even under heavy NDEP inputs. If this recycled litter nitrogen is retained in ecosystem pools differently to added mineral N, then estimates of the effects of NDEP on the relative change in C (∆C/∆N) based on short-term isotope-labelled mineral fertilizer additions should be questioned. We used 15N labelled litter to track decomposed N in the soil system (litter, soils, microbes, and roots) over 18 months in a Sitka spruce plantation and directly compared the fate of this 15N to an equivalent amount in simulated NDEP treatments. By the end of the experiment, three times as much 15N was retained in the O and A soil layers when N was derived from litter decomposition than from mineral N additions (60% and 20%, respectively), primarily because of increased recovery in the O layer. Roots expressed slightly more 15N tracer from litter decomposition than from simulated mineral NDEP (7.5% and 4.5%) and compared to soil recovery, expressed proportionally more 15N in the A layer than the O layer, potentially indicating uptake of organic N from decomposition. These results suggest effects of NDEP on forest ∆C/∆N may not be apparent from mineral 15N tracer experiments alone. Given the importance of N recycling, an important but underestimated effect of NDEP is its influence on the rate of N release from litter. © 2016 The Authors. Global Change Biology Published by John Wiley & Sons Ltd
资助项目: This study was conducted with the assistance of Daisuke Taira and Archie Crofton (University of Edinburgh) and Colin McEvoy and Carina Convery (Forest Research, UK) for field and technical assistance. James Morison (Forest Research, UK) provided useful comments in internal review. Isotope analyses were performed by Nick Morley at the University of Aberdeen, United Kingdom. This work was funded by the UK Natural Environment Research Council (NERC), grant NE/G00725 X/1 and Forestry Commission, UK.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60998
Appears in Collections:影响、适应和脆弱性

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作者单位: School of Geosciences, University of Edinburgh, Crew Building, Edinburgh, Midlothian, United Kingdom; Forest Research, Northern Research Station, Roslin, Midlothian, United Kingdom; ICREA at CREAF, Campus de UAB, Cerdanyola del Vallés, Bellaterra, Barcelona, Spain; Max Planck Institut für Biogeochemie, Jena, Germany

Recommended Citation:
Nair R.K.F.,Perks M.P.,Mencuccini M.. Decomposition nitrogen is better retained than simulated deposition from mineral amendments in a temperate forest[J]. Global Change Biology,2017-01-01,23(4)
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