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| Effects of silicon application on anaerobic CH4 oxidation in a paddy field under nighttime warming |
| Received:May 19, 2022 |
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| KeyWord:methane;anaerobic oxidation;nighttime warming;silicon application;carbon sequestration efficiency;paddy field;soil |
| Author Name | Affiliation | E-mail | | XIE Qing | Collaborative Innovation Center for Forecast and Evaluation of Meteorological Disasters/Jiangsu Provincial Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | XUE Mengqi | Collaborative Innovation Center for Forecast and Evaluation of Meteorological Disasters/Jiangsu Provincial Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHOU Cong | Collaborative Innovation Center for Forecast and Evaluation of Meteorological Disasters/Jiangsu Provincial Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHANG Yaohong | Collaborative Innovation Center for Forecast and Evaluation of Meteorological Disasters/Jiangsu Provincial Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | yhzhang@nuist.edu.cn | | LOU Yunsheng | Collaborative Innovation Center for Forecast and Evaluation of Meteorological Disasters/Jiangsu Provincial Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | GAO Xiaopeng | Department of Soil Science, University of Manitoba, Winnipeg R3T2N2, Canada | | | JIA Zhongjun | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | |
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| Abstract: |
| Si is a beneficial element for rice growth. The effects of Si application on the CH4 oxidation process in paddy fields and whether it will change the effect of nighttime warming on this process are still unclear. In this study, the four treatments included no Si application at ambient nighttime temperature(CK) and at nighttime warming(NW), and silicon application at ambient nighttime temperature(Si) and at nighttime warming(NW+Si). The surface soils were collected after four years of the above-mentioned treatments, and the 13CH4 isotope labeling method was used to study the anaerobic CH4 oxidation rates, its 13C sequestration, and its response to nitrogen(N) fertilization. The results showed that the anaerobic CH4 oxidation rate under NW treatment, which was 6.23 nmol · g-1 · d-1(in terms of 13CO2), was significantly lower than that under CK treatment. The rate of NW treatment significantly increased by 22% under NW+Si treatment. The netincrement of 13C soil organic carbon(13C-SOC) driven by 13CH4 oxidation under NW treatment, which was 0.31 μmol·g-1 and significantly lower than that in CK paddy soils, was not significantly different than that in NW+Si paddy field. This indicated that Si application had no significant effect on the carbon sequestration of CH4 anaerobic oxidation in the nighttime warming paddy field. The anaerobic CH4 oxidation rates of paddy fields substantially decreased 29%-50% under N fertilization, especially in paddy soils under Si treatment. In contrast, N fertilization remarkably increased the carbon sequestration efficiency[13C-SOC(/13C-SOC +13CO2)] of CH4 anaerobic oxidation. In conclusion, silicon application could alleviate the inhibitory effect of nighttime warming on the CH4 oxidation process in paddy fields but had no significant effect on carbon sequestration. N fertilization could improve the carbon sequestration efficiency of CH 4 anaerobic oxidation in paddy fields, which favored fixing a higher proportion of 13C-CH4 into soil organic carbon in the process of CH4 oxidation. |
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