DOI: 10.1007/s10533-016-0204-x
Scopus记录号: 2-s2.0-84963994824
论文题名: Asymmetric and symmetric warming increases turnover of litter and unprotected soil C in grassland mesocosms
作者: Phillips C.L. ; Murphey V. ; Lajtha K. ; Gregg J.W.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 128, 期: 2018-01-02 起始页码: 217
结束页码: 231
语种: 英语
英文关键词: Density fractionation
; Grassland
; Oregon
; Power analysis
; Soil carbon
; Soil respiration
; Warming
Scopus关键词: accumulation rate
; bioenergetics
; carbon flux
; decomposition
; diurnal variation
; fractionation
; grassland soil
; litter
; mesocosm
; soil carbon
; soil organic matter
; soil respiration
; temperature profile
; warming
; Missouri
; Oregon County
; United States
英文摘要: The response of soil organic carbon (SOC) to increasing temperature is a critical and uncertain component of terrestrial ecosystems feedbacks to climate. To investigate warming impacts on soil and whole-ecosystem carbon cycling, we conducted a whole-ecosystem warming experiment in grassland mesocosms in Oregon, USA, with diurnal temperature profiles simulating both asymmetric and symmetric increases in daily minimum (Tmin) and maximum (Tmax) temperature. In 2011 we reported that after 3 years of warming, the ecosystem switched from a neutral C balance to a C source, with warming causing an average loss of 88 g C m−2 year−1. Because warming had no impact on aboveground net primary productivity, decomposition of SOC was initially the suspected source of these emissions. Here we report follow-up data from years 4–9 on the effects of warming on soil C stocks, litter, and soil respiration. We employed several complimentary methods to isolate the readily-mineralizable soil C fraction, but power analysis showed that only density fractionation provided sufficient power to detect warming impacts from natural variability. Collectively, the warming treatments reduced the C content in the light density fraction by 9 % after 6 years, and also dramatically reduced litter accumulation, with about 50 % less litter C in warmed chambers by year 9. Consistent with these losses, warming also increased soil respiration by an average of 27–29 %. We conclude that warming-induced losses of unprotected soil carbon and litter, but not protected C, were detectable within a decade. © 2016, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83401
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 Crops and Soil Science, Oregon State University, Corvallis, OR, United States; Terrestrial Ecosystems Research Associates, 200 SW 35th St, Corvallis, OR, United States
Recommended Citation:
Phillips C.L.,Murphey V.,Lajtha K.,et al. Asymmetric and symmetric warming increases turnover of litter and unprotected soil C in grassland mesocosms[J]. Biogeochemistry,2016-01-01,128(2018-01-02)