DOI: 10.1007/s10533-014-9962-5
Scopus记录号: 2-s2.0-84900805558
论文题名: Effects of simulated increased grazing on carbon allocation patterns in a high arctic mire
作者: Falk J.M. ; Schmidt N.M. ; Ström L.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 119, 期: 2018-01-03 起始页码: 229
结束页码: 244
语种: 英语
英文关键词: Arctic
; Carbon
; Grazing
; Methane
; Mire
; Muskox
; Organic acid
Scopus关键词: aboveground biomass
; belowground biomass
; biomass allocation
; carbon balance
; growing season
; methane
; mire
; organic acid
; plant-herbivore interaction
; Arctic
; Greenland
; Zackenberg
; Ovibos moschatus moschatus
; Tracheophyta
英文摘要: Herbivory is an important part of most ecosystems, and grazing alone can have a considerable impact on the ecosystems carbon balance with both direct and indirect effects. Removal of above-ground biomass by consumption of herbivores will change the below-ground carbon stock; the reduction of litter that goes into the ground will influence the total ecosystem carbon content. Little is however known about how plant-herbivory interactions effect the carbon balance, in particular methane emissions, of high arctic mires. We hypothesized that increased grazing pressure will change carbon allocation patterns resulting in decreased net ecosystem uptake of carbon and subsequently in lower methane emissions. An in-situ field experiment was conducted over 3 years in a high arctic mire at Zackenberg in NE Greenland. The experiment consisted of three treatments, with five replicates of each (1) control, (2) vascular plants were removed (NV), (3) clipped twice each growing season in order to simulate increased muskox grazing. Immediately after the initiation of the experiment net ecosystem uptake of CO2 decreased in clipped plots (mean total decrease for the three following years was 35 %). One year into the experiment a significantly lower CH4 emission was observed in these plots, the total mean reduction for the following 2 years was 26 %. Three years into the experiment significantly lower substrate (acetic acid) availability for CH4 production was observed (27 % reduction). NV plots had a mean decrease in CO2 uptake of 113 %, a 62 % decrease in ecosystem respiration and an 84 % decrease in CH4 emission (mean of all 3 years). Our study shows that increased grazing pressure in a high arctic mire can lead to significant changes in the carbon balance, with lower CO2 uptake leading to lower production of substrate for CH4 formation and in lower CH4 emission. © 2014 The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83710
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Physical Geography and Ecosystem Science, Lund University, Sölvegatan 12, 223 62 Lund, Sweden; Department of Bioscience, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark; Arctic Research Centre, Aarhus University, C.F. Møllers Allé 8, 8000 Aarhus C, Denmark
Recommended Citation:
Falk J.M.,Schmidt N.M.,Ström L.. Effects of simulated increased grazing on carbon allocation patterns in a high arctic mire[J]. Biogeochemistry,2014-01-01,119(2018-01-03)