Dipterocarpaceae, the dominant family of Bornean canopy trees, display the unusual reproductive strategy of strict interspecific mast-fruiting. During 1986-99, more than 50 dipterocarp species dispersed seed only within a 1- to 2-month period every 3 to 4 years during El Nino-Southern Oscillation events. Synchronous seed production occurred across extensive areas and was essential for satiating seed predators. Logging of dipterocarps reduced the extent and intensity of these reproductive episodes and exacerbated local El Nino conditions. Viable seed and seedling establishment have declined as a result of climate, logging, and predators. Since 1991, dipterocarps have experienced recruitment failure within a national park, now surrounded by logged forest.

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An increasing number of population in Serang has resulted in the diversion of vegetated land function to be built area, thus reducing total area of green open space (RTH) of the city. Impact of the land conversion increase will occur on the increasing area of land cover. Land cover thus reduced the vegetation ability to absorb CO2, so that the CO2 generated from activities in the city, such as from energy consumption, livestock and landfill waste cannot be absorbed optimally

Serang city is the capital city of Banten province surrounded by cities and counties nearby. At this time serang city has become center of activities and migration of the counties nearits that cause the past population growth. This of course will affect to the building both physical and non physical ones. At the same time environment problem increases too, such as the height of temperature , the increase of air pollution, trafkic jam, the decrease of water quality. One of the ways of handling the problems is bye keeping and developing green open space, that will become city forest. This research is to find out the potency of the impact of city forest management to envirounment in Serang city, like air quality. CO2 decrease, noise, moisture, and potency of carbon as well as potency of water absorbance. Research methodoly used is using primary data of environmental quality test in fivelocation in Serang city which is placed near the city forest area to colculate the potency of carbon absorbance using formula of biomassa tree calcution which is calculated based on the ability of plantation water absorbance. The research show that the value of physical environment in city forest area is better than the condition of physical environment which is forer from the city forest.