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[Effects of Biochar and Straw on Soil N2O Emission from a Wheat Maize Rotation System]
Zhan-Ming Tang1, Xing-Ren Liu1, Qing-Wen Zhang1
1Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
Huan Jing Ke Xue= Huanjing Kexue
|March 20, 2021
Summary
Biochar application can mitigate greenhouse gas emissions from agricultural soils, while direct straw return may increase nitrous oxide (N2O) emissions. Further research is needed on straw maturity effects.
Area of Science:
- Agricultural Science
- Soil Science
- Environmental Science
Context:
- Intensively farmed land in North China utilizes a winter wheat-summer maize rotation system.
- Soil N2O emissions are a significant environmental concern in agricultural practices.
- Efficient straw utilization and greenhouse gas mitigation are critical for sustainable agriculture.
Purpose:
- To investigate the impact of biochar and straw return on soil N2O emissions.
- To provide a theoretical basis for N2O emission reduction strategies.
- To evaluate the effectiveness of biochar and straw return for greenhouse gas mitigation.
Summary:
- Biochar application (9.0 t·hm⁻²·a⁻¹) and straw return (SR) were tested in a winter wheat-summer maize system.
- SR and biochar+SR treatments significantly increased N2O emissions during the wheat season (47.4% and 71.8%) and maize season (13.4% and 35.8%).
- Soil water, NH4+-N, MBN, NO3--N, and MBC were identified as key environmental factors influencing N2O emissions.
Impact:
- Biochar application is an effective strategy for mitigating greenhouse gas emissions.
- Direct straw return may not be an effective method for reducing N2O emissions.
- Further research on the impact of straw maturity on N2O emissions is recommended.
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