Abstract
Petungkriyono is the last tropical forest in Java and provides biodiversity including rare flora and fauna that must be maintained, managed and utilized in order to give meaning for humanity and sustainability. Services of Forest Ecosystem in Petungkriyono are included such as goods supply, soil-water conservation, climate regulation, purification environment and flora fauna habitats. The approach of this study is the literature review from various studies before perceiving the influenced of economic valuation in determining the measurement conservation strategies of Petungkriyono Natural Forest Ecosystem in Pekalongan Regency. The aims of this study are to analyzing an extended benefit cost of natural forest ecosystems and internalizing them in decision making. The method of quantification and valuation of forest ecosystem is Cost and Benefit Analysis (CBA) which is a standard economic appraisal tools government in development economics. CBA offers the possibility capturing impact of the project. By using productivity subtitution value and extended benefit cost analysis any comodity such as Backwoods,Pine Woods, Puspa woods and Pine Gum. Water value, preventive buildings of landslide and carbon sequestration have total economic value of IDR.163.065.858.080, and the value of Extended Benefit Cost Ratio in Petungkriyono is 281.35 %. However, from the result is expected the local government of Pekalongan to have high motivation in preserve the existence of Petungkriyono forest.
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