| Mulberry-fish pond ecosystem is an efficient mode of agricultural material recycling and utilization, which contains great value. Fish pond subsystem is the main economic source and component of mulberry-fish pond production mode, and its safety and benefit are worth studying further. Nitrogen and phosphorus elements, as the main nutrients in the subsystem of fish pond, provide a lot of nutrients for fish pond aquaculture, but the excess nitrogen and phosphorus elements will lead to eutrophication of fish pond water and other water pollution problems, resulting in serious economic losses of fish pond. At present, the research on mulberry-fish pond is limited to spatial evolution pattern, evaluation of management modes, the process and mechanism of water-land interaction, input-output efficiency, material circulation and energy flow, etc., while the law of nutrient migration and transformation in mulberry-fish pond is not fully understood. In order to explore the underlying scientific law of mulberry-fish pond ecosystem, the basic characteristics, existing form, release behavior and cycling characteristics of nitrogen and phosphorus in fish pond water body and sediment are summarized by combing and summarizing the research literature of mulberry-fish pond system in recent ten years, and the migration and transformation mechanism and influencing factors of nitrogen and phosphorus at the water-sediment interface are revealed, which are of great significance to the management and control of water eutrophication and scientific breeding of mulberry-fish pond ecoysytem, and thus provide reference basis and solutions for the inheritance and protection of mulberry-fish pond. |
