Mangrove rehabilitation opportunity analysis in Indragiri Hilir mangrove silviculture landscape, Riau Province, Indonesia

Abstract

Abstract Indonesia has targeted 600,000 hectares for mangrove rehabilitation but faces the global challenge of low rehabilitation success rates due to site unsuitability. This study examines mangrove rehabilitation opportunities in Indragiri Hilir, which are degraded due to logging, land use change, and increased salinization due to climate change. Geospatial analysis was used to identify potential areas using data on mangrove loss and Alooded vegetation, validated by ground truthing. These areas were overlaid with datasets of water occurrence, tidal Alats, and coastlines. Analysis results showed a potential area of 11,178 ha out of 117,400 ha of Indragiri Hilir mangroves, including low density mangrove typologies, open land, eroded mangroves, ponds, and salinized coconut plantations. Ranking of rehabilitation opportunities based on forest status, land use, and mangrove cover. Only 26% of the total potential area was classiAied as high, 69% as medium, and 5% as low. Potential areas are generally located in Other Use Areas in the form of salinized coconut plantations and other land uses (52%), requiring tenure negotiations with the community. Recommended techniques include assisted natural revegetation (ANR), stress removal, and direct planting for low density mangrove and open land typologies; erosion control techniques for eroded mangroves; and minor hydrological rehabilitation for salinized coconut plantations, ponds, and open land. Strategic recommendations are based on stakeholder diagnosis of key success factors. Aspects of motivation and enabling conditions are generally present. Technical knowledge, appropriate technical design, Ainancial incentives and feedbacks are implementation aspects that need intervention to improve the success of rehabilitation efforts.

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