According to the source of water in swamp soil, swamp can be divided into low-level swamp, medium-level swamp and high-level swamp.
The low-level swamp is recharged by surface water or groundwater and contains minerals; The median swamp is supplied by rainwater and surface water; The high-level swamp is supplied by rainwater and is poor in nutrition. According to the growth of vegetation, swamp can be divided into herb swamp, peat moss swamp and woody swamp. Herbaceous swamps have perennial ponding or soil moisture permeability, and grow Carex and Gramineae, such as reed and some Carex; Sphagnum swamp is mainly distributed in coniferous forest belt. Due to the environment of water, cold and poor nutrition, a large number of Sphagnum grow; The vegetation of woody swamp is mainly woody plants.