DOI: 10.1111/j.1365-2486.2012.02779.x
论文题名: Climate, duration, and N placement determine N2O emissions in reduced tillage systems: A meta-analysis
作者: van Kessel C. ; Venterea R. ; Six J. ; Adviento-Borbe M.A. ; Linquist B. ; van Groenigen K.J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 1 起始页码: 33
结束页码: 44
语种: 英语
英文关键词: Conservation tillage
; Mitigation
; N-fertilizer
; Nitrous oxide
; Yield-scaled
Scopus关键词: nitrogen
; nitrous oxide
; agricultural ecosystem
; carbon sequestration
; conservation tillage
; crop yield
; emission control
; erosion control
; experimental study
; fertilizer application
; humid environment
; management practice
; meta-analysis
; nitrous oxide
; soil carbon
; soil texture
; zero tillage
; agriculture
; climate
; meta analysis
; review
; Agriculture
; Climate
; Nitrogen
; Nitrous Oxide
英文摘要: No-tillage and reduced tillage (NT/RT) management practices are being promoted in agroecosystems to reduce erosion, sequester additional soil C and reduce production costs. The impact of NT/RT on N2O emissions, however, has been variable with both increases and decreases in emissions reported. Herein, we quantitatively synthesize studies on the short- and long-term impact of NT/RT on N2O emissions in humid and dry climatic zones with emissions expressed on both an area- and crop yield-scaled basis. A meta-analysis was conducted on 239 direct comparisons between conventional tillage (CT) and NT/RT. In contrast to earlier studies, averaged across all comparisons, NT/RT did not alter N2O emissions compared with CT. However, NT/RT significantly reduced N2O emissions in experiments >10 years, especially in dry climates. No significant correlation was found between soil texture and the effect of NT/RT on N2O emissions. When fertilizer-N was placed at ≥5 cm depth, NT/RT significantly reduced area-scaled N2O emissions, in particular under humid climatic conditions. Compared to CT under dry climatic conditions, yield-scaled N2O increased significantly (57%) when NT/RT was implemented <10 years, but decreased significantly (27%) after ≥10 years of NT/RT. There was a significant decrease in yield-scaled N2O emissions in humid climates when fertilizer-N was placed at ≥5 cm depth. Therefore, in humid climates, deep placement of fertilizer-N is recommended when implementing NT/RT. In addition, NT/RT practices need to be sustained for a prolonged time, particularly in dry climates, to become an effective mitigation strategy for reducing N2O emissions. © 2012 Blackwell Publishing Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62565
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Plant Sciences, University of California, Davis, CA 95616, United States; U.S. Department of Agriculture-ARS, Soil and Water Management Research Unit, St. Paul, 55108, United States; Department of Biological Sciences, Merriam-Powell Center for Environmental Research, Northern Arizona University, Flagstaff, AZ 86011, United States
Recommended Citation:
van Kessel C.,Venterea R.,Six J.,et al. Climate, duration, and N placement determine N2O emissions in reduced tillage systems: A meta-analysis[J]. Global Change Biology,2013-01-01,19(1)