ANALISIS KUALITAS AIR SUNGAI WAY BALAU BANDAR LAMPUNG MENGGUNAKAN PARAMETER PLANKTON SEBAGAI INDIKATROR BIOLOGI

ALIYA, NABILA (2026) ANALISIS KUALITAS AIR SUNGAI WAY BALAU BANDAR LAMPUNG MENGGUNAKAN PARAMETER PLANKTON SEBAGAI INDIKATROR BIOLOGI. Diploma thesis, UIN RADEN INTAN LAMPUNG.

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Abstract

ABSTRAK Sungai Way Balau mengalami tekanan dari aktivitas permukiman, limbah domestik, banjir, perdagangan yang berpotensi menurunkan kualitas air. Penelitian ini bertujuan menganalisis kualitas air berdasarkan komunitas plankton, kecerahan, nitrat, dan fosfat serta hubungan antarparameter tersebut. Penelitian dilaksanakan pada April Mei 2026 menggunakan pendekatan kuantitatif deskriptif. Sampel air dan plankton diambil pada empat titik dengan purposive sampling. Parameter plankton meliputi kelimpahan, keanekaragaman, keseragaman, dan dominansi. Hubungan parameter kualitas air dengan plankton dianalisis menggunakan korelasi Spearman. Hasil penelitian menemukan 13 genus plankton dengan Oscillatoria sebagai genus dominan sebanyak 118 individu. Kelimpahan plankton berkisar 35.400–46.800 ind/L, indeks keanekaragaman 1,190–1,564, keseragaman 0,664–0,859, dan dominansi 0,259–0,422. Konsentrasi nitrat sebesar 16,83–20,41 mg/L melampaui baku mutu pada seluruh titik, sedangkan fosfat titik 3 sebesar 0,21 mg/L juga melampaui baku mutu. Uji Spearman menunjukkan tidak terdapat hubungan yang signifikan antara parameter fisika-kimia dan struktur komunitas plankton. Sungai Way Balau tergolong keanekaragaman sedang, meskipun komunitas planktonnya masih relatif stabil. Kata kunci: Indikator biologi, Kualitas air, Pencemaran, Plankton, Sungai Way Balau ABSTRACT The Way Balau River is affected by residential activities, domestic waste, flooding, commercial activities that may reduce water quality. This study aimed to assess water quality based on plankton communities, water transparency, nitrate, and phosphate and to analyze the relationships among these parameters. The study was conducted from April to May 2026 using a descriptive quantitative approach. Water and plankton samples were collected from four stations through purposive sampling. Plankton parameters included abundance, diversity, evenness, and dominance. The relationships between water quality parameters and plankton communities were analyzed using Spearman’s correlation. The results identified 13 plankton genera, with Oscillatoria as the dominant genus, totaling 118 individuals. Plankton abundance ranged from 35,400 to 46,800 individuals/L, the diversity index ranged from 1.190 to 1.564, the evenness index ranged from 0.664 to 0.859, and the dominance index ranged from 0.259 to 0.422. Nitrate concentrations of 16.83–20.41 mg/L exceeded the quality standard at all stations, while phosphate at station 3 reached 0.21 mg/L and also exceeded the standard. Spearman’s correlation showed no significant relationship between physicochemical parameters and plankton community structure. The Way Balau River was categorized as moderately polluted, although its plankton community remained relatively stable. Keywords: Biological Indicator, Plankton, Pollution, Water Quality, Way Balau River.

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