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Regulation of soil CO2 and N2O emissions by cover crops: A meta-analysis
Muhammad, Ihsan1; Sainju, Upendra M.2; Zhao, Fazhu1; Khan, Ahmad3; Ghimire, Rajan4; Fu, Xin1; Wang, Jun1,5
2019-09-01
Source PublicationSOIL & TILLAGE RESEARCH
ISSN0167-1987
Volume192Pages:103-112
Corresponding AuthorWang, Jun(wangj@nwu.edu.cn)
AbstractCover crops provide multiple agronomic and environmental benefits, such as enhanced soil carbon sequestration, aggregation, water infiltration, and reduced erosion and nutrient leaching compared with no cover crop. However, little is known regarding the effect of cover crop species, biomass quality and quantity, and method of residue placement on greenhouse gas (GHG) emissions. Using meta-analysis, this study examined the effect of cover crop species, quality and quantity of biomass, and residue management on response ratios (RRs) of cover crops to no cover crop on CO2 and N2O emissions following cash crops. All cover crop species increased CO2 emissions, but reduced N2O emissions compared with no cover crop, except legumes which increased N2O emissions. Cover crop biomass explained 63% of variability in increased CO2 emissions and 55% of variability in decreased N2O emissions. Both CO2 and N2O emissions decreased polynomially with increased cover crop biomass C/N ratio, with greater rate of decline for legumes than nonlegumes. Cover crop residue incorporated into the soil increased CO2 and N2O emissions compared with the residue placed at surface or removed from the soil. Cover crops emitted lower CO2 and N2O emissions than no cover crops in silty loam and sandy clay loam soils, respectively, compared to clay loam and silty clay loam soils. Both soil organic carbon and total nitrogen increased with cover crop compared to no cover crop. Although CO2 and N2O emissions varied with cover crop species, using legume and nonlegume cover crop mixture to enhance residue C/N ratio compared to legumes and placing the residue at the surface instead of incorporating into the soil can reduce GHG emissions. Because of enhanced soil C and N storage and other known benefits, improvement in soil health and environmental quality due to cover crop may outweigh CO2 emissions compared to no cover crop.
KeywordResidue biomass Residue C/N ratio Greenhouse gas emission
DOI10.1016/j.still.2019.04.020
WOS KeywordNITROUS-OXIDE EMISSIONS ; GREENHOUSE-GAS EMISSIONS ; CROPPING SYSTEMS ; INORGANIC FERTILIZER ; MANAGEMENT-PRACTICES ; REDUCED TILLAGE ; N DYNAMICS ; CARBON ; RESIDUES ; MANURE
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[31570440] ; National Natural Science Foundation of China[31270484] ; CAS Light of West China Program ; International Scientific and Technological Cooperation and Exchange Project of Shaanxi Province, China[2015KW-026]
Funding OrganizationNational Natural Science Foundation of China ; CAS Light of West China Program ; International Scientific and Technological Cooperation and Exchange Project of Shaanxi Province, China
WOS Research AreaAgriculture
WOS SubjectSoil Science
WOS IDWOS:000472984400011
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/58367
Collection中国科学院地理科学与资源研究所
Corresponding AuthorWang, Jun
Affiliation1.Northwest Univ, Coll Urban & Environm Sci, Shaanxi Key Lab Earth Surface Syst & Environm Car, Xian 710127, Shaanxi, Peoples R China
2.USDA ARS, Northern Plains Agr Res Lab, 1500 North Cent Ave, Sidney, MT 59270 USA
3.Univ Agr, Dept Agron, Peshawar, Pakistan
4.New Mexico State Univ, Agr Sci Ctr, 2346 State Rd 288, Clovis, NM 88101 USA
5.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
Recommended Citation
GB/T 7714
Muhammad, Ihsan,Sainju, Upendra M.,Zhao, Fazhu,et al. Regulation of soil CO2 and N2O emissions by cover crops: A meta-analysis[J]. SOIL & TILLAGE RESEARCH,2019,192:103-112.
APA Muhammad, Ihsan.,Sainju, Upendra M..,Zhao, Fazhu.,Khan, Ahmad.,Ghimire, Rajan.,...&Wang, Jun.(2019).Regulation of soil CO2 and N2O emissions by cover crops: A meta-analysis.SOIL & TILLAGE RESEARCH,192,103-112.
MLA Muhammad, Ihsan,et al."Regulation of soil CO2 and N2O emissions by cover crops: A meta-analysis".SOIL & TILLAGE RESEARCH 192(2019):103-112.
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