DOI: 10.1111/gcb.12904
论文题名: Anthropogenic nitrogen deposition enhances carbon sequestration in boreal soils
作者: Maaroufi N.I. ; Nordin A. ; Hasselquist N.J. ; Bach L.H. ; Palmqvist K. ; Gundale M.J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 8 起始页码: 3169
结束页码: 3180
语种: 英语
英文关键词: Boreal forest
; Boreal soil
; Carbon sequestration
; Carbon sink
; Nitrogen deposition
; Soil C pool
; Soil respiration
Scopus关键词: biomass
; boreal forest
; carbon dioxide
; carbon sequestration
; carbon sink
; deposition
; ecosystem dynamics
; global change
; nitrogen
; soil carbon
; soil respiration
; carbon
; nitrogen
; soil
; carbon sequestration
; chemistry
; ecosystem
; microbiology
; soil
; Sweden
; taiga
; Carbon
; Carbon Sequestration
; Ecosystem
; Nitrogen
; Soil
; Soil Microbiology
; Sweden
; Taiga
英文摘要: It is proposed that carbon (C) sequestration in response to reactive nitrogen (Nr ) deposition in boreal forests accounts for a large portion of the terrestrial sink for anthropogenic CO2 emissions. While studies have helped clarify the magnitude by which Nr deposition enhances C sequestration by forest vegetation, there remains a paucity of long-term experimental studies evaluating how soil C pools respond. We conducted a long-term experiment, maintained since 1996, consisting of three N addition levels (0, 12.5, and 50kgNha-1yr-1) in the boreal zone of northern Sweden to understand how atmospheric Nr deposition affects soil C accumulation, soil microbial communities, and soil respiration. We hypothesized that soil C sequestration will increase, and soil microbial biomass and soil respiration will decrease, with disproportionately large changes expected compared to low levels of N addition. Our data showed that the low N addition treatment caused a non-significant increase in the organic horizon C pool of 15% and a significant increase of 30% in response to the high N treatment relative to the control. The relationship between C sequestration and N addition in the organic horizon was linear, with a slope of 10kgCkg-1N. We also found a concomitant decrease in total microbial and fungal biomasses and a 11% reduction in soil respiration in response to the high N treatment. Our data complement previous data from the same study system describing aboveground C sequestration, indicating a total ecosystem sequestration rate of 26kgCkg-1N. These estimates are far lower than suggested by some previous modeling studies, and thus will help improve and validate current modeling efforts aimed at separating the effect of multiple global change factors on the C balance of the boreal region. © 2015 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61757
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Umea, Sweden; Umea Plant Science Center (UPSC), Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, Umea, Sweden; Department of Ecology and Environmental Science (EMG), Umea University, Umea, Sweden
Recommended Citation:
Maaroufi N.I.,Nordin A.,Hasselquist N.J.,et al. Anthropogenic nitrogen deposition enhances carbon sequestration in boreal soils[J]. Global Change Biology,2015-01-01,21(8)