Mangrove wetland ecosystems generally include mangroves, tidal flats and base fish ponds. Generally by the algae, mangrove and semi-mangrove plants, associated plants, animals, microorganisms and other biological factors and sunlight, water, soil and other non-biological factors. Decomposition of the type and number are less, and the main anaerobic microorganisms, organism decomposition of incomplete body. Consumers are mainly sweet birds, especially waterfowl and fish, benthic invertebrates, insects, amphibians, reptiles are also more common, fewer species and the number of mammals.
Biological retention technology mainly through the matrix filtration, adsorption and microbial action to purify the infiltration of runoff rainwater. Because it can temporarily store the rain and then slowly into the surrounding soil, therefore, can play to reduce the surface rainwater peak flow, reduce runoff pollution and so on. Biological retention technology can include many forms, the more commonly used biological retention pool, concave green space, ecological grass ditch, plant buffer zone, rain garden and ecological wetlands. It can also include rainwater reuse facilities, soil improvement and so on.