DOI: 10.1029/2017JG004260
Scopus记录号: 2-s2.0-85046796058
论文题名: Assessing Short-Term Impacts of Management Practices on N2O Emissions From Diverse Mediterranean Agricultural Ecosystems Using a Biogeochemical Model
作者: Deng J. ; Li C. ; Burger M. ; Horwath W.R. ; Smart D. ; Six J. ; Guo L. ; Salas W. ; Frolking S.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 5 起始页码: 1557
结束页码: 1571
语种: 英语
英文关键词: biogeochemical modeling
; diverse cropping systems
; farming management practices
; N2O emission
Scopus关键词: agricultural ecosystem
; agricultural emission
; agricultural management
; biogeochemistry
; crop plant
; cropping practice
; environmental conditions
; environmental factor
; fertilizer application
; Intergovernmental Panel on Climate Change
; management practice
; model
; model test
; nitrous oxide
; Lactuca
; Medicago sativa
; Prunus dulcis
; Triticum aestivum
英文摘要: Croplands are important sources of nitrous oxide (N2O) emissions. The lack of both long-term field measurements and reliable methods for extrapolating these measurements has resulted in a large uncertainty in quantifying and mitigating N2O emissions from croplands. This is especially relevant in regions where cropping systems and farming management practices (FMPs) are diverse. In this study, a process-based biogeochemical model, DeNitrification-DeComposition (DNDC), was tested against N2O measurements from five cropping systems (alfalfa, wheat, lettuce, vineyards, and almond orchards) representing diverse environmental conditions and FMPs. The model tests indicated that DNDC was capable of predicting seasonal and annual total N2O emissions from these cropping systems, and the model's performance was better than the Intergovernmental Panel on Climate Change emission factor approach. DNDC also captured the impacts on N2O emissions of nitrogen fertilization for wheat and lettuce, of stand age for alfalfa, as well as the spatial variability of N2O fluxes in vineyards and orchards. DNDC overestimated N2O fluxes following some heavy rainfall events. To reduce the biases of simulating N2O fluxes following heavy rainfall, studies should focus on clarifying mechanisms controlling impacts of environmental factors on denitrification. DNDC was then applied to assess the impacts on N2O emissions of FMPs, including tillage, fertilization, irrigation, and management of cover crops. The practices that can mitigate N2O emissions include reduced or no tillage, reduced N application rates, low-volume irrigation, and cultivation of nonleguminous cover crops. This study demonstrates the necessity and potential of utilizing process-based models to quantify N2O emissions from regions with highly diverse cropping systems. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113951
Appears in Collections: 气候减缓与适应
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作者单位: Earth Systems Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH, United States; Department of Land, Air and Water Resources, University of California, Davis, CA, United States; Department of Viticulture and Enology, University of California, Davis, CA, United States; Department of Environmental Systems Science, Swiss Federal Institute of Technology, ETH Zürich, Zürich, Switzerland; Research Division, California Air Resources Board, Sacramento, CA, United States; Applied GeoSolutions, LLC, Durham, NH, United States
Recommended Citation:
Deng J.,Li C.,Burger M.,et al. Assessing Short-Term Impacts of Management Practices on N2O Emissions From Diverse Mediterranean Agricultural Ecosystems Using a Biogeochemical Model[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(5)