It is, indeed, very closely related with the development of the national economy. In nature, animals, plants, and microorganisms come together to form a unified entity, or ecological system. The close relationship among animals, plants, and microorganisms and between these organisms and the environment, is made possible by the flow of energy and the circulation of material. Ecological systems are both large and small. In addition to these natural ecological systems, there are other ecological systems, such as the rice fish system.
All agricultural systems are, in fact, anthropogenic.
The nonbiological factors in the rice fish ecosystem include light, water, water temperature, pH, carbon dioxide, oxygen, and some inorganic matter. The biological factors in the ecosystem include producers, consumers, and decomposers. The main producers are plants with roots and large and small phytoplankton. They are all involved in the circulation of carbon through photosynthesis and respiration, and they provide organic matter to consumers and decomposers. There are also many consumers.