Pedosphere 35(4): 715--727, 2025
ISSN 1002-0160/CN 32-1315/P
©2025 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Rice-fish coculture without phosphorus addition improves phosphorus availability in paddy soil by regulating phosphorus fraction partitioning and alkaline phosphomonoesterase-encoding bacterial community |
Xing LIU1,2,3, Yuting CHEN1,2,3, Hongjun ZHENG1,2,3, Daolin SUN1,2,3, Jiaen ZHANG1,2,3,4 , Qi JIA1,2,3, Qi CHEN1,2,3 |
1 Guangdong Engineering Technology Research Center of Modern Eco-Agriculture and Circular Agriculture, South China Agricultural University, Guangzhou 510642 (China)
2 Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, South China Agricultural University, Guangzhou 510642 (China)
3 Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642 (China)
4 Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou 510642 (China) |
| ABSTRACT |
| Rice-fish coculture (RFC) has aroused extensive concern for its contribution to food security and resource conservation, but whether it can improve soil phosphorus (P) availability and affect microbe-mediated P turnover remains elusive. Herein, we conducted a microcosm experiment to assess the impacts of RFC combined with (50 mg P kg-1 as KH2PO4) and without inorganic P addition on P fractions, P availability, and phoD-harboring bacterial community composition. The results revealed that RFC without P addition significantly improved P availability and phosphatase activity in paddy soil, while soil available P (AP), pH, and microbial biomass P (MBP) contributed to regulating P fractions. Moreover, the phoD-harboring bacterial abundance was linked to phosphatase activity, AP, total carbon (TC), and total P (TP) contents, and the ratios of TC to total nitrogen (TN) and TN to TP. We also found that the keystone taxa of phoD-harboring bacteria contributed to phosphatase production as well as organic P mineralization, thereby improving P availability. Our findings suggest that RFC without P addition is beneficial for promoting the expression of phoD-harboring bacterial functions to improve the capacity of P mineralization. Overall, our study provides insights into the responses of phoD-harboring bacterial functions for P turnover to RFC combined with and without P addition, showing the potential utilization of P resources in agricultural soil and the contribution of phosphatase activity to P acquisition in agriculture ecosystem. |
| Key Words: bacterial community composition,microbial biomass phosphorus,phoD-harboring bacteria,phosphatase activity,phosphorus mineralization |
| Citation: Liu X, Chen Y T, Zheng H J, Sun D L, Zhang J E, Jia Q, Chen Q. 2025. Rice-fish coculture without phosphorus addition improves phosphorus availability in paddy soil by regulating phosphorus fraction partitioning and alkaline phosphomonoesterase-encoding bacterial community. Pedosphere. 35(4): 715-727. |
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