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| Effects of long-term rice-crayfish co-culture system on N2O emission in the fluvo-aquic soil in Jianghan Plain |
| Received:February 06, 2025 |
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| KeyWord:rice-crayfish farming system;N2O;soil depth;paddy soil;fluvo-aquic soil |
| Author Name | Affiliation | E-mail | | NIE Jiangwen | Hubei Key Laboratory of Waterlogging Disaster and Agricultural Use of Wetland/Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, College of Agriculture, Yangtze University, Jingzhou 434025, China | | | ZHU Jie | Xiangyang Academy of Agricultural Sciences, Xiangyang 441000, China | | | JIANG Mengdie | Hubei Key Laboratory of Waterlogging Disaster and Agricultural Use of Wetland/Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, College of Agriculture, Yangtze University, Jingzhou 434025, China | | | ZHU Bo | Hubei Key Laboratory of Waterlogging Disaster and Agricultural Use of Wetland/Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, College of Agriculture, Yangtze University, Jingzhou 434025, China | | | LIU Zhangyong | Hubei Key Laboratory of Waterlogging Disaster and Agricultural Use of Wetland/Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, College of Agriculture, Yangtze University, Jingzhou 434025, China | | | HE Hao | Shanwei Academy of Agricultural Sciences, Shanwei 516600, China | hhcau@163.com |
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| Abstract: |
| The rice-crayfish co-culture（RC）system plays a crucial role in promoting the sustainable development of rice paddies and enhancing their ecological benefits. However, the long-term effects of this system on soil N2O emissions, particularly the mechanisms at different soil depths, are not yet well understood. This study, based on an 8-year field experiment in the Jianghan Plain, collected soil samples from the surface（0-20 cm）and subsurface（20-40 cm）layers under RC and conventional single rice monoculture（RM）systems. The samples were subjected to controlled incubation（60% field water holding capacity, 25 ℃, for 42 days）to measure N2O fluxes and soil carbon and nitrogen fractions. The results showed that the RC system significantly influenced N2O emissions, with soil depth playing a regulating role. Compared to RM, the RC system significantly reduced N2O emissions from the surface soil by 37%, while significantly increasing N2O emissions from the subsurface soil by 149%（P<0.05）. In addition, N2O emissions in the RC system were mainly concentrated in 21-40 d（49%-73%）, whereas in the RM system N2O emissions peaked in 4-21 d（66%-77%）. Regarding soil properties, compared to RM, the RC system significantly increased the pH, total carbon（TC）, total nitrogen（TN）, soil organic carbon（SOC）, ammonia nitrogen（NH+4-N）, and dissolved organic carbon（DOC）in the surface soil, while reducing available phosphorus（AP）, ratio of TC to TN （TC/TN）, nitrate nitrogen（NO-3-N）, and dissolved nitrogen（DON）. In the subsurface soil, the RC system significantly increased pH, AP, TC, TN, NH+4-N, and the DOC/DON ratio, but reduced SOC, NO-3-N, DOC, DON, and electrical conductivity（EC）. Pearson correlation and redundancy analyses revealed that N2O emissions were positively correlated with AP and C/N, and negatively correlated with SOC, DON, and EC. In conclusion, the long-term rice-crayfish co-culture system significantly affects N2O emissions in fluvo-aquic rice soils, with soil depth serving as a regulatory factor. Soil factors such as AP, TC/TN ratio, and EC are crucial in regulating N2O emissions. |
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