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| Greenhouse Gas Emissions in Red Soil as Influenced by Different C/N Residues Under Nitrogen Applications |
| Received:April 19, 2014 |
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| KeyWord:residue returning;greenhouse gas emission;C/N;nitrogen fertilizer application;red soil |
| Author Name | Affiliation | E-mail | | WU Yu-peng | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Wuhan 430070, China | | | LIU Tian | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | PENG Qi-an | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | Muhammad Shaaban | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | HU Rong-gui | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Wuhan 430070, China | rghu@mail.hzau.edu |
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| Abstract: |
| Nitrogen(N) fertilizer application can accelerate decomposition of incorporated residues in soils. However, the effect of N applications on greenhouse gas(GHG) emissions following incorporation of different C/N residues is still not well understood. In this study, an incubation study was carried out to examine GHG emissions from red soil incorporated with rape cake(C/N:4), maize stalk(C/N:28), rice straw(C/N:41) and wheat straw(C/N:71) under three N addition rates(zero, low and high levels). Nitrogen applications increased CO2 emission, but significant difference was observed only in wheat straw treatment. The cumulative CO2 emission in wheat straw treatment was 1 271.44 mg·kg-1 at low N and 1 212.83 mg·kg-1 at high N application, significantly higher than that of no N application(883.40 mg·kg-1). The cumulative N2O emission was highest in rape cake treatment(5 550.42 μg·kg-1) at low N application while relatively lower N2O emission(3 752.84 μg·kg-1) at high N addition. However, nitrogen application did not show significant influence on the cumulative N2O emissions in soils incorporated with maize and wheat residues. Over the entire incubation period, all treatments tended to be a sink of CH4. Overall, nitrogen effects on GHG emissions depend on residue C/N ratios. |
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