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All Journal Inspiratif Pendidikan JPG (Jurnal Pendidikan Geografi) al-Afkar, Journal For Islamic Studies IJGIE (International Journal of Graduate of Islamic Education) Informatika Wicida Journal of Sharia (JOSH) Pubmedia Social Sciences and Humanities Jurnal Riset Rumpun Ilmu Pendidikan (JURRIPEN) Causa: Jurnal Hukum dan Kewarganegaraan
Muhammad Muhaimin
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Religion Humanities Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Physics Social Sciences Other

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Biological Assessment of Trophic Status in Riam Kanan Reservoir, Indonesia Aswin Nur Saputra; Muhammad Muhaimin; Herlina Herlina
JPG (Jurnal Pendidikan Geografi) Vol 13, No 1 (2026)
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jpg.v13i1.24217

Abstract

Understanding nutrient–biomass relationships is essential for assessing trophic dynamics in tropical reservoirs experiencing increasing anthropogenic pressure. This study evaluates the biological condition and trophic status of Riam Kanan Reservoir, South Kalimantan, Indonesia, using field measurements of chlorophyll-a, dissolved phosphate, and water transparency across 20 sampling stations. Sampling locations were spatially delineated using Landsat 8 composite imagery to ensure representative coverage of major hydrological zones. Statistical analyses included descriptive statistics, regression modeling, and Carlson’s Trophic State Index (TSI). Chlorophyll-a concentrations ranged from 2.48 to 7.18 µg L⁻¹ (mean 3.94 ± 1.26 µg L⁻¹), while dissolved phosphate exhibited high spatial variability (1–385 µg L⁻¹; mean 86.20 ± 99.18 µg L⁻¹). Secchi depth varied between 1.60 and 2.56 m (mean 2.18 ± 0.26 m). Regression analysis revealed a significant positive relationship between dissolved phosphate and chlorophyll-a (R² = 0.278, p < 0.05), indicating that phosphorus availability contributes to phytoplankton biomass variability. However, chlorophyll-a did not significantly explain transparency variation, suggesting that non-algal turbidity influenced optical conditions. TSI values derived from chlorophyll-a and Secchi depth consistently classified the reservoir as mesotrophic. The results indicate moderate biological productivity with localized nutrient enrichment and partial nutrient–biomass coupling. Spatial heterogeneity in phosphate suggests potential external inputs and internal loading processes. Integrated nutrient management and sustained multi-parameter monitoring are recommended to prevent trophic escalation under increasing anthropogenic and climatic pressures.
Co-Authors Ahmad Fauzi Muhana Ahmad Suriansyah Andi Yusika Rangan Aslamiah Aswin Nur Saputra Aswin Nur Saputra Bahram, Muhammad Besse Ruhaya Deasy Arisanty Destiana Nur Fitriani Edy Rakhmadi Herlina Herlina Juhri Karunia Puji Hastuti, Karunia Puji Manalullaili Muhammad Amri Muhammad Hamsah Muhammad Rusmin B Muhammad Saleh Norliani Nuraida Nurchamidah Nurlaela Siti Nor Asm Siti Qomariah Suhaimi Zamroni Ishaq Ishaq