The urban ecosystem is the ecological system located inside a city and which is composed of ecological infrastructure (green infrastructure + blue infrastructure) and built infrastructure (grey infrastructure). The green infrastructure consists of natural and anthropogenic elements, such as parks in urban areas, grass roofs and walls, farmland with high natural value, or forests with high conservation value. Green infrastructure can preserve and create landscape features that ensure ecosystems will continue to provide services such as clean water, clean air, productive soils, and attractive recreation areas. The municipality of Bălți, of 7798.54 ha according to the Land Registry, mostly includes agricultural land - 51% (4001.44 ha), followed by constructions and courtyards – 28% (2138.25 ha), forests -9% (722.75 ha), lands occupied by water and lands for streets and markets with 4% each, roads – 3% and other lands including degraded. In the rural area, agricultural land predominates, and in the urban area – buildings and yards. Urban ecosystems are considered to be in "good condition" if living conditions for people and urban biodiversity are good. This means, among other things, good air and water quality, a sustainable provision of ecosystem services, good conservation status of species and habitats, and a high level of urban species diversity. Another criterion concerns the balance between built and green infrastructure within the ecosystem.