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| Effects of concentrated wheat straw return combined with decomposing agents on greenhouse gas emissions in a rice-wheat system |
| Received:August 20, 2024 |
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| KeyWord:rice-wheat rotation;straw return;decomposing agents;greenhouse gas;yield |
| Author Name | Affiliation | E-mail | | LI Ruolin | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | WANG Shichen | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | JIN Penghui | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | ZHANG Guangbin | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | MA Jing | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | jma@issas.ac.cn | | ZHU Zhenke | State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Plant Virology, Ningbo University, Ningbo 315211, China | | | YAN Zhiying | Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China | | | XU Hua | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | |
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| Abstract: |
| Improper straw return significantly increases methane（CH4）emissions in rice paddies. To mitigate CH4 emissions, this study proposes a novel straw return method for the rice season：concentrated straw return combined with the application of decomposing agents. The experiment included three treatments：conventional evenly straw return（CK）, straw concentrated return at twice the amount with decomposing agents（S2）, and straw concentrated return at four times the amount with decomposing agents（S4）. Static chamber-gas chromatography was used to monitor CH4 and N2O fluxes in the rice-wheat rotation system（2022—2023）, alongside measurements of soilproperties, including oxidation-reduction potential （Eh）, dissolved organic carbon（DOC）, ammonium nitrogen（NH4+-N）, and nitrate nitrogen （NO3--N）. The results showed that the CK exhibited annual CH4 and N2O emissions of 120.1 kg·hm-2 and 5.08 kg·hm-2（ calculated by N）, respectively. Compared to CK, S2 and S4 significantly reduced CH4 emissions by 41% and 28% during the rice season, while increased N2O emissions by 10% and 26%, respectively. During the wheat season, all treatments exhibited CH4 uptake, and no significant differences were observed in N2O emissions. The significant reduction in CH4 emissions during the rice season in S2 and S4 offset the warming effect of the increased N2O emissions, resulting in a 25% and 12% significant reduction in total annual greenhouse gas emissions compared to CK, respectively. There were no significant differences in crop yields（rice：5.50-5.59 t·hm-2; wheat：3.18-3.24 t·hm-2）among the treatments, and as a result, the annual greenhouse gas emission intensity of S2 and S4 was significantly lower than that of CK. In conclusion, concentrated straw return combined with decomposing agents during the rice season can significantly reduce greenhouse gas emissions without decreasing rice and wheat yields. |
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