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| Effects of Different Straw-Returning on Macrobenthic Community Structure in Rice-Crayfish Fields During Winter and Spring |
| SUN Ying1,2,3, LI Wei1,2,3, XI Yewen4, CHENG Yongxu1,2,3, LI Jiayao1,2,3 |
1. Key Laboratory of Integrated Rice-Fish Farming Ecology, Ministry of Agriculture and Rural Affairs, Shanghai Ocean University, Shanghai 201306, China;
2. Shanghai Engineering Research Center of Aquaculture, Shanghai Ocean University, Shanghai 201306, China;
3. National Demonstration Centre for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China;
4. Fisheries Technology Promotion Station of Anhui Province, Hefei 230000, China |
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Abstract The purpose of this experiment is to study the characteristics of macrobenthic community changes before and after the application of red swamp crayfish Procambarus clarkia under the treatment of the amount of straw-returning to the rice field in winter and spring. Macrobenthic community structure including diversity, density and biomass were analyzed in red swamp crayfish in several 125 m2 ricecrayfish fields at Shanghai Ocean University Chongming Base (N 31°34', E 121°33') with varying amounts of straw-returning including 0(CK), 1500 kg/hm2(S1), 3500 kg/hm2(S2), and 4500 kg/hm2(S3) from December 2018 to July 2019. The results showed that before and after releasing crayfish, diversity index is presented as S2>S3>S1>CK and CK> S2> S3>S1,respectively. Before the release of crayfish, the relationship between total density, biomass and the amount of returning all showed as S3>S2>S1>CK. After the release of crayfish, the total density of S1, S2 and S3 treatment was dropped significantly. The calculation of the dominance index found that the density of Branchiura sowerbyi, Limnodrilus hoffmeisteri, Hippeutis umbilicalis Benson was decreased significantly (P<0.05), suggesting that these might be important natural food for crayfish. Among them, the density of dominant species in S2 treatment was dropped significantly higher than that in S1 and S3 treatments. Redundancy analysis (RDA) showed that soil total phosphorus, soil bulk density and organic matter were the key factors influencing the macrobenthic community structure. Under the experimental conditions, considering the changes of macrobenthos community structure, soil fertility and aquaculture water indicators before and after crayfish feeding, S2 is the most suitable amount of straw returning to the field.
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Received: 12 April 2021
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