DOI: 10.1111/gcb.13044
论文题名: Long-term impacts of manure amendments on carbon and greenhouse gas dynamics of rangelands
作者: Owen J.J. ; Parton W.J. ; Silver W.L.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 12 起始页码: 4533
结束页码: 4547
语种: 英语
英文关键词: Carbon sequestration
; DayCent
; Greenhouse gas emissions
; Manure
; Pasture
; Rangelands
; Soil
Scopus关键词: carbon
; carbon sequestration
; community response
; greenhouse gas
; manure
; pasture
; plant community
; primary production
; rangeland
; soil amendment
; soil carbon
; California
; United States
; Poaceae
; air pollutant
; carbon
; carbon dioxide
; gas
; manure
; methane
; nitrous oxide
; soil
; air pollutant
; analysis
; California
; chemistry
; dairying
; gas
; greenhouse effect
; manure
; season
; soil
; theoretical model
; time
; Air Pollutants
; California
; Carbon
; Carbon Dioxide
; Dairying
; Gases
; Global Warming
; Greenhouse Effect
; Manure
; Methane
; Models, Theoretical
; Nitrous Oxide
; Seasons
; Soil
; Time
英文摘要: Livestock manure is applied to rangelands as an organic fertilizer to stimulate forage production, but the long-term impacts of this practice on soil carbon (C) and greenhouse gas (GHG) dynamics are poorly known. We collected soil samples from manured and nonmanured fields on commercial dairies and found that manure amendments increased soil C stocks by 19.0 ± 7.3 Mg C ha-1 and N stocks by 1.94 ± 0.63 Mg N ha-1 compared to nonmanured fields (0-20 cm depth). Long-term historical (1700-present) and future (present-2100) impacts of management on soil C and N dynamics, net primary productivity (NPP), and GHG emissions were modeled with DayCent. Modeled total soil C and N stocks increased with the onset of dairying. Nitrous oxide (N2O) emissions also increased by ~2 kg N2O-N ha-1 yr-1. These emissions were proportional to total N additions and offset 75-100% of soil C sequestration. All fields were small net methane (CH4) sinks, averaging -4.7 ± 1.2 kg CH4-C ha-1 yr-1. Overall, manured fields were net GHG sinks between 1954 and 2011 (-0.74 ± 0.73 Mg CO2 e ha-1 yr-1, CO2e are carbon dioxide equivalents), whereas nonmanured fields varied around zero. Future soil C pools stabilized 40-60 years faster in manured fields than nonmanured fields, at which point manured fields were significantly larger sources than nonmanured fields (1.45 ± 0.52 Mg CO2e ha-1 yr-1 and 0.51 ± 0.60 Mg CO2e ha-1 yr-1, respectively). Modeling also revealed a large background loss of soil C from the passive soil pool associated with the shift from perennial to annual grasses, equivalent to 29.4 ± 1.47 Tg CO2e in California between 1820 and 2011. Manure applications increased NPP and soil C storage, but plant community changes and GHG emissions decreased, and eventually eliminated, the net climate benefit of this practice. © 2015 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61854
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Environmental Science, Policy and Management, University of California, 137 Mulford Hall #3114, Berkeley, CA, United States; Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO, United States
Recommended Citation:
Owen J.J.,Parton W.J.,Silver W.L.. Long-term impacts of manure amendments on carbon and greenhouse gas dynamics of rangelands[J]. Global Change Biology,2015-01-01,21(12)