Asnil, B. Saputra, J.A. Sari
Lake ecosystems in Indonesia provide diverse ecosystem services but face sustainability challenges due to uncontrolled utilization patterns. This study develops a comprehensive economic valuation framework for Maninjau Lake ecosystem services, focusing on environmental externalities and policy implications. Using a mixed-methods approach, data were collected from 450 respondents through structured surveys and 25 key informants through in-depth interviews. Economic valuation employed the Contingent Valuation Method (CVM), Travel Cost Method (TCM), and market price approaches, while environmental externalities were identified using damage cost and replacement cost methods. Results show that the total economic value of IDR is 2.847 trillion per year, dominated by clean water supply (38.2%) and hydroelectric power generation (31.5%). Environmental externality analysis identifies a net economic loss of IDR 408 billion annually, with intensive fish cage aquaculture contributing IDR 186 billion annually through eutrophication - community willingness to pay averages IDR 156,000 per household year for conservation programs. Policy implications include Payment for Ecosystem Services schemes (IDR 167 billion per year), environmental taxes based on the polluter pays principle, and participatory co-management systems. This integrated approach is projected to increase local welfare by 18-23% and improve environmental quality by 35-40% within five years, contributing to sustainable lake management frameworks in Indonesia. © 2025 Published under licence by IOP Publishing Ltd.
Department of Public Administration, Universitas Negeri Padang, Jl Prof Dr. Hamka Air Tawar Barat, Padang, 25132, Indonesia; Department of Public Administration, Universitas Terbuka, Jl Cabe Raya Selatan, Tangerang, 15437, Indonesia
