Different Fish Farming Patterns in Paddy Fields Substantially Impact the Bacterial Community Composition, Stability, and Assembly Processes in Paddy Water

Yiran Hou, Rui Jia, Linjun Zhou, Liqiang Zhang, Bing Li and Jian Zhu ()
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Yiran Hou: Key Laboratory of Integrated Rice-Fish Farming Ecology, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
Rui Jia: Key Laboratory of Integrated Rice-Fish Farming Ecology, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
Linjun Zhou: Key Laboratory of Integrated Rice-Fish Farming Ecology, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
Liqiang Zhang: Key Laboratory of Integrated Rice-Fish Farming Ecology, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
Bing Li: Key Laboratory of Integrated Rice-Fish Farming Ecology, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
Jian Zhu: Key Laboratory of Integrated Rice-Fish Farming Ecology, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China

Agriculture, 2024, vol. 14, issue 12, 1-16

Abstract: Integrated rice–fish farming is an innovative agricultural production pattern that combines rice cultivation with fish farming, enhancing agricultural productivity and ensuring food security. Partitioned rice–fish farming, an advancement of the traditional approach, addresses challenges such as difficulties in fish harvesting and the inconveniences of mechanized operations encountered in paddy fields. To evaluate the environmental impacts of partitioned rice–fish farming on the agricultural ecosystem, we investigated the impacts of partitioned rice–fish farming on the diversity, composition, functionality, co-occurrence networks, and assembly processes of bacterial communities within paddy water. Our results revealed significantly improved Chao1, Observed species, and Pd_faith indices for the bacterial community in the partitioned rice–fish farming system. The relative abundances of the Bacteroidota, Gemmatimonadota, Proteobacteria, and Fluviicola in paddy water were altered by the partitioned system. The partitioned system considerably impacted the bacterial co-occurrence networks within the paddy water, with the planktonic bacterial co-occurrence network in rice cultivation area having more nodes (205) and edges (2085), and its robustness being significantly higher than that of other groups, resulting in a more complex and stable structure of the planktonic bacterial community. In addition, the partitioned system significantly promoted the contribution of stochastic processes to bacterial community assembly in the paddy water, with the main enhanced stochastic processes being homogenizing dispersal and drift. The total proportion of these processes for bacterial community assembly increased from 60% to 70%. Nitrate concentrations in the paddy water were remarkably associated with the water bacterial communities and contributed most to the variations in water bacterial communities. Hence, partitioned rice–fish farming is a feasible and good agricultural production pattern, and from the perspectives of bacterial community diversity and stability it offers both theoretical insights and data-supported foundations for advancing sustainable agricultural practices.

Keywords: rice–fish farming; partitioned recirculation renovation; agricultural production pattern; bacterial community; bacterial co-occurrence network (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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