DOI: 10.1111/gcb.13130
论文题名: Multivariate regulation of soil CO2 and N2O pulse emissions from agricultural soils
作者: Liang L.L. ; Grantz D.A. ; Jenerette G.D.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期: 3 起始页码: 1286
结束页码: 1298
语种: 英语
英文关键词: Agriculture
; Carbon decomposition
; CO 2
; Drying-rewetting
; N2O
; Pulse gas fluxes
; Temperature sensitivity
Scopus关键词: air pollutant
; carbon dioxide
; nitrous oxide
; soil
; agriculture
; air pollutant
; analysis
; California
; chemistry
; environmental monitoring
; multivariate analysis
; soil
; Agriculture
; Air Pollutants
; California
; Carbon Dioxide
; Environmental Monitoring
; Multivariate Analysis
; Nitrous Oxide
; Soil
英文摘要: Climate and land-use models project increasing occurrence of high temperature and water deficit in both agricultural production systems and terrestrial ecosystems. Episodic soil wetting and subsequent drying may increase the occurrence and magnitude of pulsed biogeochemical activity, affecting carbon (C) and nitrogen (N) cycles and influencing greenhouse gas (GHG) emissions. In this study, we provide the first data to explore the responses of carbon dioxide (CO2) and nitrous oxide (N2O) fluxes to (i) temperature, (ii) soil water content as percent water holding capacity (%WHC), (iii) substrate availability throughout, and (iv) multiple soil drying and rewetting (DW) events. Each of these factors and their interactions exerted effects on GHG emissions over a range of four (CO2) and six (N2O) orders of magnitude. Maximal CO2 and N2O fluxes were observed in environments combining intermediate %WHC, elevated temperature, and sufficient substrate availability. Amendments of C and N and their interactions significantly affected CO2 and N2O fluxes and altered their temperature sensitivities (Q10) over successive DW cycles. C amendments significantly enhanced CO2 flux, reduced N2O flux, and decreased the Q10 of both. N amendments had no effect on CO2 flux and increased N2O flux, while significantly depressing the Q10 for CO2, and having no effect on the Q10 for N2O. The dynamics across DW cycles could be attributed to changes in soil microbial communities as the different responses to wetting events in specific group of microorganisms, to the altered substrate availabilities, or to both. The complex interactions among parameters influencing trace gas fluxes should be incorporated into next generation earth system models to improve estimation of GHG emissions. © 2016 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61477
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: Department of Botany and Plant Sciences, University of California, Riverside, CA, United States; Department of Botany and Plant Sciences, University of California at Riverside, Kearney Agricultural Center, Parlier, CA, United States
Recommended Citation:
Liang L.L.,Grantz D.A.,Jenerette G.D.. Multivariate regulation of soil CO2 and N2O pulse emissions from agricultural soils[J]. Global Change Biology,2016-01-01,22(3)