The availability of land for green open spaces such as Taman Mataram Merah in the city of Jakarta is limited, so it requires green open space that provides maximum value for the benefit of the city community and surrounding communities. The purpose of this study was to see the role of Taman Mataram Merah as a producer of oxygen and storage of water for the surrounding environment. If the oxygen production from each tree and the ability to absorb water in Taman Mataram Merah is known, the next effort is to model a development of vegetation that can optimize oxygen production and increase water absorption. The method used in this research is descriptive analysis method (identification of landscape characteristics), evaluative analysis method (calculating oxygen production from vegetation and water absorbing site capability based on the type of land cover), and efforts to develop vegetation and water absorption. The characteristics of trees that cluster and accumulate and have strata affect the production of oxygen and the ability to hold and absorb water. This research is expected to increase the awareness of the government and the public towards the importance of the existence of green open spaces for the continuity of the availability of oxygen and water in urban areas and can be a reference for the development of the park.

Keywords: optimization of oxygen production, water absorption, green open space, sustainability.