LARASATI, MEI (2023) ANALISIS HUBUNGAN NUTRIEN DAN KEKERUHAN DENGAN KELIMPAHAN FITOPLANKTON DI WADUK KEDUNG OMBO, JAWA TENGAH (23dsa228). Undergraduate thesis, Fakultas Perikanan dan Ilmu Kelautan.

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Abstract

ABSTRAK
(Mei Larasati. 26010119130040. Analisis Hubungan Nutrien dan Kekeruhan dengan Kelimpahan Fitoplankton di Waduk Kedung Ombo, Jawa Tengah. Siti Rudiyanti dan Arif Rahman).
Waduk Kedung Ombo merupakan waduk serbaguna yang dimanfaatkan sebagai sarana irigasi, sumber air minum, pembangkit tenaga listrik, pariwisata, dan KJA. Limbah bahan organik berupa sisa pakan dan kotoran ikan dari KJA
menjadi isu utama terhadap penurunan kualitas perairan. Hal ini berdampak pada kelimpahan fitoplankton sebagai produsen primer di perairan. Tujuan penelitian ini yaitu mengetahui konsentrasi nutrien dan kekeruhan, kelimpahan dan struktur komunitas fitoplankton, mengetahui hubungan nutrien dan kekeruhan dengan kelimpahan fitoplankton, serta mengetahui tingkat kesuburan perairan. Penelitian dilaksanakan pada Juni hingga Desember 2022 di Waduk Kedung Ombo. Penelitian ini termasuk penelitian survei lapangan. Sampling dilakukan 3 kali dengan interval waktu 1 bulan di 3 stasiun yang berbeda. Pengambilan sampel air dan fitoplankton diambil di kedalaman permukaan. Analisis data menggunakan regresi linier berganda. Hasil penelitian menunjukkan bahwa konsentrasi nitrat berkisar antara 0,2 – 0,7 mg/L; fosfat 0,1 – 0,87 mg/L; dan kekeruhan 3,52 – 20,18 NTU. Kelimpahan fitoplankton berkisar antara 17.882-90.280 sel/L dengan indeks keanekaragaman rendah, indeks keseragaman tinggi, dan indeks dominansi rendah. Terdapat korelasi yang kuat antara nutrien dan kekeruhan terhadap kelimpahan fitoplankton dengan nilai r = 0,800. Koefisien determinasi (R2) = 0,640 yang menunjukkan bahwa kelimpahan fitoplankton dipengaruhi oleh nutrien dan kekeruhan sebesar 64%, sedangkan sisanya 36% dipengaruhi oleh faktor lain. Tingkat kesuburan perairan tergolong tinggi (eutrofik).
Kata kunci: Eutrofik, Kelimpahan, Kesuburan, Nutrien, Waduk Kedung Ombo

ABSTRACT
(Mei Larasati. 26010119130040. Analysis of Nutrient and Turbidity Relationships with Phytoplankton Abundance in Kedung Ombo Reservoir, Central Java. Siti Rudiyanti and Arif Rahman).
Kedung Ombo Reservoir is a multipurpose reservoir that is utilized as an irrigation facility, drinking water source, power plant, tourism, and KJA. Organic matter waste in the form of residual feed and fish waste from KJA is a major issue
for the decline in water quality. This has an impact on the abundance of phytoplankton as primary producers in the waters. The purpose of this study was to determine the concentration of nutrients and turbidity, abundance and structure of phytoplankton communities, determine the relationship between nutrients and turbidity with phytoplankton abundance, and determine the level of water fertility. The research was conducted from June to December 2022 in Kedung Ombo Reservoir. This research included field survey research. Sampling was conducted 3 times with an interval of 1 month at 3 different stations. Water and phytoplankton samples were taken at surface depth. Data analysis used multiple linear regression. The results showed that nitrate concentrations ranged from 0.2 – 0.7 mg/L; phosphate 0.1 – 0.87 mg/L; and turbidity 3.52 – 20.18 NTU. Phytoplankton abundance ranged from 17882 – 90280 cells/L with low diversity index, high uniformity index, and low dominance index. There is a strong correlation between nutrients and turbidity to phytoplankton abundance with a value of r = 0.800. The coefficient of determination (R2) = 0.640 which indicates that phytoplankton abundance is influenced by nutrients and turbidity by 64%, while the remaining 36% is influenced by other factors. The level of water fertility is high (eutrophic).
Keywords: Abundance, Eutrophic, Fertility, Kedung Ombo Reservoir, Nutrients

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