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| Effects of stocking density of Procambarus clarkii on greenhouse gas emissions from rice fields |
| Received:January 08, 2024 |
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| KeyWord:crayfish culture before rice planting;Procambarus clarkii;stocking density;methane;nitrous oxide;greenhouse gas emission intensity |
| Author Name | Affiliation | E-mail | | MU Hongcheng | 1. Key Laboratory of Integrated Rice-Fish Farming, Ministry of Agriculture and Rural Affairs/National Experimental Teaching Demonstration Center for Aquatic Sciences/National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China | | | CHENG Yongxu | 1. Key Laboratory of Integrated Rice-Fish Farming, Ministry of Agriculture and Rural Affairs/National Experimental Teaching Demonstration Center for Aquatic Sciences/National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China | | | XU Xu | 1. Key Laboratory of Integrated Rice-Fish Farming, Ministry of Agriculture and Rural Affairs/National Experimental Teaching Demonstration Center for Aquatic Sciences/National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China | | | SUN Mengqin | 1. Key Laboratory of Integrated Rice-Fish Farming, Ministry of Agriculture and Rural Affairs/National Experimental Teaching Demonstration Center for Aquatic Sciences/National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China | | | LI Jinghao | 1. Key Laboratory of Integrated Rice-Fish Farming, Ministry of Agriculture and Rural Affairs/National Experimental Teaching Demonstration Center for Aquatic Sciences/National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China | | | LI Ya | 1. Key Laboratory of Integrated Rice-Fish Farming, Ministry of Agriculture and Rural Affairs/National Experimental Teaching Demonstration Center for Aquatic Sciences/National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China | | | LI Jiayao | 1. Key Laboratory of Integrated Rice-Fish Farming, Ministry of Agriculture and Rural Affairs/National Experimental Teaching Demonstration Center for Aquatic Sciences/National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China | jy-li@shou.edu.cn |
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| Abstract: |
| In order to investigate the effects of crayfish density on greenhouse gas（GHG）emissions from aquaculture fields prior to rice planting, in this study, we compared CH4 and N2O emissions under different crayfish stocking densities：10.8, 6.5 ind·m-2, and 2.2 ind·m-2 （D1, D2, and D3）, with a flooded rice field serving as the control（CK）. The results showed that the average surface emission fluxes and profile concentrations of CH4 and N2O in each group were as follows：CK>D1>D2>D3, and the average emission fluxes of CH4 and N2O in the CK group were 34.36 mg·m-2·h-1 and 0.19 mg·m-2·h-1, respectively. The average emission fluxes of CH4 in D1, D2 and D3 treatments were 9.0%, 19.0% and 27.4% lower than those in CK group, and the average emission fluxes of N2O were 13.4%, 21.6% and 27.2% lower than those in CK group. The global warming potential（GWP）of CK group was 10.14 tCO2e·hm-2, which was significantly higher than that of the D1, D2 and D3 groups（P<0.05）. Pearson correlation analysis showed that GHG emissions were mainly affected by profile gases, total nitrogen, ground temperature, and total soil porosity, and that environmental factors were modulated by crayfish density, which in turn would affect GHG emissions, and ultimately the correlation between GHG emissions and GWP. The survival rates of D1, D2 and D3 were 73.65%, 69.26%, and 67.48%, respectively, with no significant difference between groups. The highest crayfish production value was 3.15× 104 yuan·hm-2 in D2, which was significantly higher than that in D1 and D3 groups（P<0.05）, while the greenhouse gas emission intensity （GHGI）of different culture density groups was D2P<0.05）. In conclusion, the introduction of crayfish into flooded fields prior to rice planting has been shown to result in a significant reduction in GHG emissions. However, it should be noted that as the crayfish stocking density increases, GHG emissions also increase. From a comprehensive perspective considering economic and ecological benefits, a crayfish stocking density of 6.5 ind·m-2 demonstrates better yields and specifications, while maintaining lower values for GWP and GHGI. |
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