(16 points) Haizhu Wetland Park is a composite wetland ecosystem of urban lake wetland and semi-natural fruit forest, which is called the &”;south lung&”; and &”;kidney&”; of Guangzhou. (1) Each biological population occupies different positions in the wetland ecosystem, which reflects the community&;s

(1) spatial (vertical and horizontal) abiotic substances and energy, decomposers (2) purification of water biodiversity, resistance and stability of species diversity (3) aerobic bacteria decompose organic matter to produce CO2 (and inorganic salts), which is beneficial to the growth of black algae; Black algae use CO2 (and inorganic salts) for photosynthesis, and produce O2 to promote aerobic bacteria to decompose organic matter in sewage.