DOI: 10.1007/s10533-017-0320-2
Scopus记录号: 2-s2.0-85015666722
论文题名: Influence of experimental extreme water pulses on greenhouse gas emissions from soils
作者: Petrakis S. ; Seyfferth A. ; Kan J. ; Inamdar S. ; Vargas R.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 133, 期: 2 起始页码: 147
结束页码: 164
语种: 英语
英文关键词: Carbon dioxide
; Continuous measurements
; Extreme events
; Methane
; Nitrous oxide
Scopus关键词: carbon dioxide
; experimental study
; extreme event
; global warming
; greenhouse gas
; measurement method
; methane
; microbial activity
; nitrous oxide
; soil emission
; Maryland
; United States
英文摘要: Climate models predict increased frequency and intensity of storm events, but it is unclear how extreme precipitation events influence the dynamics of soil fluxes for multiple greenhouse gases (GHGs). Intact soil mesocosms (0–10 cm depth) from a temperate forested watershed in the piedmont region of Maryland [two upland forest soils, and two hydric soils (i.e., wetland, creek bank)] were exposed to experimental water pulses with periods of drying, forcing soils towards extreme wet conditions under controlled temperature. Automated measurements (hourly resolution) of soil CO2, CH4, and N2O fluxes were coupled with porewater chemistry analyses (i.e., pH, Eh, Fe, S, NO3 −), and polymerase chain reaction–denaturing gradient gel electrophoresis to characterize changes in microbial community structure. Automated measurements quantified unexpected increases in emissions up to 245% for CO2 (Wetland), >23,000% for CH4 (Creek), and >110,000% for N2O (Forest Soils) following pulse events. The Creek soil produced the highest soil CO2 emissions, the Wetland soil produced the highest CH4 emissions, and the Forest soils produced the highest N2O emissions during the experiment. Using carbon dioxide equivalencies of the three GHGs, we determined the Creek soil contributed the most to a 20-year global warming potential (GWP; 30.3%). Forest soils contributed the most to the 100-year GWP (up to 53.7%) as a result of large N2O emissions. These results provide insights on the influence of extreme wet conditions on porewater chemistry and factors controlling soil GHGs fluxes. Finally, this study addresses the need to test biogeochemical thresholds and responses of ecosystem functions to climate extremes. © 2017, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83282
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 Plant and Soil Sciences, University of Delaware, Newark, DE, United States; Stroud Water Research Center, 970 Spencer Road, Avondale, PA, United States
Recommended Citation:
Petrakis S.,Seyfferth A.,Kan J.,et al. Influence of experimental extreme water pulses on greenhouse gas emissions from soils[J]. Biogeochemistry,2017-01-01,133(2)