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| Phosphorus balance and eco-economic benefits in the integrated rice-crayfish system |
| Received:March 05, 2021 |
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| KeyWord:integrated rice-crayfish system;phosphorus balance;phosphorus cycle;economic benefits |
| Author Name | Affiliation | E-mail | | LIU Shaojun | Anhui Province Key Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | LI Wenbo | Anhui Province Key Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | XIONG Qizhong | Anhui Province Key Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | LI Hongying | Institute of Soil and Fertilizer, Anhui Academy of Agricultural Sciences, Hefei 230001, China | | | LI Junli | Anhui Province Key Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | LIU Rong | Anhui Liuguo Chemical Industry, Tongling 244021, China | | | GAO Hongjian | Anhui Province Key Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | YE Xinxin | Anhui Province Key Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | xxye@ahau.edu.cn |
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| Abstract: |
| Recently, the rice-crayfish system has developed rapidly in the middle and lower reaches of the Yangtze River in China. The integrated rice-crayfish system is an emerging complex ecological system for planting and breeding in this region. The study of P balance and P use efficiency in the integrated rice-crayfish system is of great significance to systematically guide P management, optimize the rice-crayfish symbiosis system, and to assess the environmental and economic benefits. In this study, a field experiment was conducted and included three treatments:rice monoculture system(RM), rice-crayfish with feed(RC feed 1), and rice-crayfish without feed(RC feed 0). The rice yield, P balance, P use efficiency, and economic and ecological benefits of the integrated rice-crayfish system were then analyzed. The results showed that there were no significant differences in rice yield across treatments, and the P balance of all three treatments in the farmland system were in surplus. The P surplus in the RC feed 0 treatment was lower than that in the RM and RC feed 1 treatments. The P uptake efficiency and P accumulation in the stems and leaves of rice in the RC feed 0 treatment were significantly(P<0.05) higher than those in the RM and RC feed 1 treatments. In the early stage(from June to August), the RC feed 0 treatment significantly reduced the total P(TP) and dissolved P(DP) concentrations in the surface water, compared with the RM and RC feed 1 treatments. There were no significant differences in TP and DP concentrations at the harvest stage. Compared with the RM treatment, RC feed 0 and RC feed 1 treatments increased net revenue by 54.22% and 51.11%, respectively. Considering rice yield, P surplus, and environmental effects, the integrated rice-crayfish system without feed is a suitable alternative for rice crop systems in this area and could be a recommended model for this region due to the high utilization efficiency of resources, low environmental risk, and good economic benefits. |
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