气候变化领域集成服务门户(CCPortal): Changes in Irrigation Practices Likely Mitigate Nitrous Oxide Emissions From California Cropland

CCPortal

DOI	10.1029/2018GB005961
	Changes in Irrigation Practices Likely Mitigate Nitrous Oxide Emissions From California Cropland
	Deng J.; Guo L.; Salas W.; Ingraham P.; Charrier-Klobas J.G.; Frolking S.; Li C.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	1514
结束页码	1527
卷号	32 期号:10
英文摘要	Crop production with intensive nitrogen (N) application is an important source of atmospheric nitrous oxide (N2O). However, there remains large uncertainty in quantifying cropland N2O emissions and their mitigation potential, especially in regions where cropping systems and farming management practices are highly diverse. Because N2O production in soils is tightly linked to N application rate and type, soil moisture, and oxygen status, improving irrigation is a potential strategy for N2O mitigation. We applied a process-based biogeochemical model, DeNitrification-DeComposition, to evaluate the influence of irrigation management on N2O emissions from California cropland, where cropping systems are extremely diverse and irrigation management has changed rapidly. We constructed a database containing data on weather, crop types and areas, soil properties, and farming management practices and predicted N2O emissions from California cropland under four typical irrigation methods (surface gravity, sprinkler, drip, and subsurface drip). We also assessed impact on N2O emissions of large-scale changes in irrigation management experienced in California from 2001 to 2010 that was driven by the demand of reducing water use in agriculture. Simulations under different irrigation methods indicated that drip and subsurface drip irrigation reduced N2O emissions by 55% and 67%, respectively, compared to surface gravity irrigation. We estimated baseline N2O emissions from California cropland as 7.94 × 103 metric ton (MT) N/year under actual irrigation management in 2002. The large-scale changes in irrigation management likely reduced N2O emissions by 7.3% from 2001 to 2010. This study showed the potential for reducing N2O emissions by using low-volume irrigation. ©2018. American Geophysical Union. All Rights Reserved.
英文关键词	biogeochemical modeling; irrigation; N2O emission; N2O mitigation
语种	英语
scopus关键词	agricultural emission; agricultural land; agricultural practice; biogeochemical cycle; database; decomposition; denitrification; emission control; irrigation; modeling; nitrous oxide; California; United States
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129787
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; California Air Resources Board, Sacramento, CA, United States; Applied GeoSolutions, LLC, Durham, NH, United States
推荐引用方式 GB/T 7714	Deng J.,Guo L.,Salas W.,et al. Changes in Irrigation Practices Likely Mitigate Nitrous Oxide Emissions From California Cropland[J],2018,32(10).
APA	Deng J..,Guo L..,Salas W..,Ingraham P..,Charrier-Klobas J.G..,...&Li C..(2018).Changes in Irrigation Practices Likely Mitigate Nitrous Oxide Emissions From California Cropland.Global Biogeochemical Cycles,32(10).
MLA	Deng J.,et al."Changes in Irrigation Practices Likely Mitigate Nitrous Oxide Emissions From California Cropland".Global Biogeochemical Cycles 32.10(2018).