| Effects of returning green manure residues of vetch and ryegrass on greenhouse gas emission in dryland soil |
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| DOI：10.7606/j.issn.1000-7601.2024.02.26 |
| Key Words: vetch ryegrass returning green manure residues greenhouse gas emissions global warming potential |
| Author Name | Affiliation | | TAN Guangye | College of Urban and Environment Science, Northwest University, Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, Xi’an, Shaanxi 710127, China
Shaanxi Key Laboratory of Carbon Neutral Technology, Xi’an, Shaanxi 710127, China | | IHSAN Muhammad | College of Urban and Environment Science, Northwest University, Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, Xi’an, Shaanxi 710127, China | | YANG Caidi | College of Urban and Environment Science, Northwest University, Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, Xi’an, Shaanxi 710127, China | | WANG Jun | College of Urban and Environment Science, Northwest University, Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, Xi’an, Shaanxi 710127, China
Shaanxi Key Laboratory of Carbon Neutral Technology, Xi’an, Shaanxi 710127, China
Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Using vetch and ryegrass residues as green manures, two 63 d incubation experiments were conducted to test the impacts of green manure application rate (0, 1, 2, 4, 6 t·hm-2) and the residual mix ratio (100% vetch, 75% vetch + 25% ryegrass, 50% vetch + 50% ryegrass, 25% vetch + 75% ryegrass, and 100% ryegrass at a rate of 4 t·hm-2) on soil CO2, N2O, and CH4 emissions. Soil green gas emissions were measured using a gas chromatography. The results indicate that: (1) Compared to the control without green manure, application of green manure significantly increased the accumulative emissions of CO2 and N2O and global warming potential (GWP) by 11.3%~80.2%, 15.8%~51.1%, and 11.9%~79.4%（P<0.05）, respectively. Soil CO2 and GWP increased, but CH4 uptake decreased linearly with the increase of application rates. However, soil N2O emission varied in a polynomial way with the increase of application rates and peaked at the rate of around 3 t·hm-2. At the same rate, application of ryegrass residue had a greater CO2 emission and CH4 uptake, while a lower N2O emission than that of vetch residue; (2) Soil greenhouse gas emissions were also correlated with the proportion of ryegrass residues in the mixture with vetch residues. Soil CO2 emission and GWP increased by 5.8%~19.7% (P<0.05) and 5.3%~17.7% (P<0.05), while N2O emission and CH4 uptake decreased with the increases of ryegrass residues in the mixture by 11.2%~41.5% (P<0.05) and 13.4%~50.9% (P<0.05). Overall, selecting green manure residues with a lower proportion of non-leguminous crops and returning them to the field with lower biomass could achieve ecological benefits while maintaining low GWP. |
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