DOI: 10.1007/s10533-016-0267-8
Scopus记录号: 2-s2.0-84992700535
论文题名: Carbon quality and nutrient status drive the temperature sensitivity of organic matter decomposition in subtropical peat soils
作者: Sihi D. ; Inglett P.W. ; Inglett K.S.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 131, 期: 2018-01-02 起始页码: 103
结束页码: 119
语种: 英语
英文关键词: Carbon quality
; Dissolved organic carbon
; Greenhouse gas
; Methane
; Nutrient availability
; Organic matter decomposition
; Peat
; Respiration
; Temperature sensitivity
Scopus关键词: carbon flux
; decomposition
; dissolved organic carbon
; environmental quality
; greenhouse gas
; methane
; nutrient availability
; nutrient limitation
; peat soil
; respiration
; sensitivity analysis
; soil organic matter
; subtropical region
; temperature effect
; temperature profile
; wetland
; Cladium jamaicense
英文摘要: Estimates of gaseous carbon (C) fluxes in wetlands are heavily based on temperature. However, isolating specific effects of temperature on anaerobic C processing from other controls (C quality and nutrients) has proven difficult. Here, we test the hypothesis that temperature sensitivity of soil organic matter (SOM) decomposition is more influenced by C quality than nutrient availability in subtropical freshwater, sawgrass (Cladium jamaicense)-based peats. Carbon age (characterized by depth: 0–10 and 10–20 cm) was used as a surrogate of C quality while two sites were selected with contrasting levels of nutrient (P) availability. In anaerobic laboratory incubations temperature was increased in 5 °C steps to assess the proportion of C available at a given temperature (i.e. thermo-labile C) as productions of gaseous (CO2 and CH4) and dissolved organic C (DOC) fractions. Thermo-labile C increased 3.1–3.6 times from 15 °C to 30 °C in all soils. Disproportionate increase in the production of gaseous forms versus DOC as well as CH4:CO2 was observed with warming. Observed Q10 values followed the trend of CH4 (~14) ≫ CO2 (~2.5) > DOC (~1.7) and temperature sensitivity was more dependent on C quality than nutrient availability over the entire temperature range. Spectral analysis indicated more bio-available DOC production at higher temperature. Regression analysis also indicated that C quality primarily influenced SOM decomposition at lower temperature, while at higher temperature nutrient limitation dominantly controlled SOM decomposition. These findings confirm the role of C quality in temperature sensitivity of warm peat soils, but also indicate an increased importance of nutrient limitation at higher temperature. © 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/83338
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 Soil and Water Sciences, Wetland Biogeochemistry Laboratory, University of Florida, 2181 McCarty Hall A, Gainesville, FL, United States
Recommended Citation:
Sihi D.,Inglett P.W.,Inglett K.S.. Carbon quality and nutrient status drive the temperature sensitivity of organic matter decomposition in subtropical peat soils[J]. Biogeochemistry,2016-01-01,131(2018-01-02)