Abstrack:
environment degradation caused by human activities. As result, natural ecosystem of the river changes into artificial ecosystem that cannot give any natural ecosystem services completely. Watershed management should be integrated, which means all the components should be managed appropriately to achieve ecosystem sustainability. Thus, ecosystem services can keep giving its benefit to human and other users. Undirectly, well management of the ecosystem can reduce disaster risk that might occur in a watershed. Aim of this research is to identify the existence and types of ecosystem services in Gajahwong watershed. This research uses descriptive method to explain the existence and types of ecosystem services in Gajahwong watershed based on 12 observation spots. The 12 observation spots aredivided inupper, middle, and down area of the watershed. Ecosystem services of river is categorized in four types, those are provisioning, regulating, cultural, and supporting services. The result shows ecosystem of Gajahwong watershed, from up to down part, is still enabling to give ecosystem services for human in various types even though it is limited. Middle part of Gajahwong watershed is the least part in providing ecosystem services because it is located in city area therefore the existence of natural ecosystem is threatened to be extinct and replaced by artificial ecosystem. As recharge area, the upper part still provides complete ecosystem services. As well as the down part which its function as discharge area, there are still many natural ecosystem working as its capacity.
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