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Adam Malik
Master of Agricultural Science Study Program, Postgraduate Program, Tadulako University , Palu, Central Sulawesi, Indonesia

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Remote Sensing of Mangrove Health and Vulnerability in Tolongano Herlangga Adiputra; Adam Malik; Bau Toknok; Hamzari; Abdul Rosyid
Agricultural Science Vol. 10 No. 1 (2026): september in progres
Publisher : Faculty of Agriculture, Merdeka University Surabaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55173/agriscience.v10i1.206

Abstract

Mangrove ecosystems play an important role in protecting coastal areas from erosion, waves, and other environmental disturbances. However, increasing anthropogenic pressures, including aquaculture expansion, settlement development, and land-use conversion, threaten their sustainability. Previous studies have commonly assessed mangrove health or vulnerability separately, providing limited insight into the relationship between ecosystem condition and potential threats. This study addresses this gap by integrating the Soil Adjusted Vegetation Index (SAVI) and Multi-Criteria Decision Analysis (MCDA) to evaluate mangrove health, spatial vulnerability, and their relationship in Tolongano Village, South Banawa Sub-district, Central Sulawesi. The integration of SAVI and MCDA offers a novel framework for identifying healthy mangrove areas that remain exposed to significant anthropogenic pressures.Using Landsat 8/9 imagery, land-use data, and field validation at 45 sampling points, mangrove health was classified into healthy (72.78 ha; 52.47%), moderate (32.82 ha; 23.66%), and unhealthy/degraded (33.11 ha; 23.87%) categories. Classification accuracy was high, with an Overall Accuracy of 97.78% and a Kappa coefficient of 0.98. Vulnerability analysis showed that 87.40% of the mangrove area was categorized as very highly vulnerable, mainly due to the proximity of aquaculture ponds. Correlation analysis produced a weak negative relationship (r = −0.2390) between mangrove health and vulnerability. The results indicate that healthy mangrove stands may still face substantial future threats. The SAVI–MCDA approach provides a practical tool for conservation prioritization, coastal spatial planning, and long-term mangrove management.
Linking Forest-Area Conversion And Land-Cover Change In Central Sulawesi Grand Forest Park Mohammad Tasdiq; Adam Malik; Imran Rahman; Naharuddin
Agricultural Science Vol. 10 No. 1 (2026): september in progres
Publisher : Faculty of Agriculture, Merdeka University Surabaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55173/agriscience.v10i1.213

Abstract

Studies on forest-area conversion generally examine land-cover dynamics and forest policy separately, leaving the relationship between formal changes in forest designation, actual landscape conditions, and their underlying institutional factors insufficiently understood. This study addresses this gap by integrating multi-temporal land-cover classification with policy, regulatory, and interview analyses to evaluate the conversion of part of the Central Sulawesi Grand Forest Park (Tahura). Sentinel-2 imagery from 2019, 2020, and 2025 was classified using the Random Forest algorithm on the Google Earth Engine platform. The spatial findings were complemented by document analysis and semi-structured interviews with three key informants from relevant forestry institutions. Classification performance showed Overall Accuracy values of 92.99%, 89.77%, and 95.30%, with Kappa coefficients of 0.8855, 0.81, and 0.86 for 2019, 2020, and 2025, respectively. The results indicate that the Tahura area decreased from 7,128 ha to 5,149 ha following Minister of Environment and Forestry Decree No. SK.6624/MENLHK-PKTL/KUH/PLA.2/10/2021. The converted area comprised 1,933 ha designated as Limited Production Forest and 46 ha as Other Land Use Areas. In 2025, the remaining Tahura was dominated by primary forest covering 3,105.38 ha (60.31%) and secondary forest covering 1,040.47 ha (20.21%). Although the conversion complied with formal procedures, it revealed tensions between regional development interests and conservation objectives. The novelty of this study lies in linking legally mandated forest-area conversion with empirically observed land-cover dynamics and institutional explanations within a single analytical framework. Practically, the findings provide a basis for post-conversion monitoring, rehabilitation prioritization, spatial-policy evaluation, tenure-conflict resolution, and the protection of ecologically important areas.