Autotrophic organisms are all, such as nitrifying bacteria and cyanobacteria (this thing is not a plant, but a prokaryote)

The producers in freshwater ecosystem are mainly phytoplankton-algae, and some rooted plants or floating plants growing in shallow water (plants in freshwater ecosystem are divided into floating plants, emergent plants and diving plants). The producers of forest and grassland ecosystems are green plants such as herbs, shrubs and trees. In the deep sea and other similar ecosystems, producers can use the chemical energy of reducing inorganic substances such as hydrogen sulfide to synthesize bacteria (sulfur bacteria).