OKTAVIANA, CLARISA IKA (2022) ANALISIS KESUBURAN PERAIRAN BERDASARKAN KLOROFIL-a, NITRAT DAN ORTOFOSFAT DI PANTAI PASIR PUTIH WATES, KALIORI, REMBANG (22m650). Undergraduate thesis, Universitas Diponegoro.

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Abstract

ABSTRAK
Clarisa Ika Oktaviana. 26010118120020. Analisis Kesuburan Perairan
Berdasarkan Klorofil-a, Nitrat dan Ortofosfat di Pantai Pasir Putih Wates, Kaliori,
Rembang. (Max Rudolf Muskananfola dan Pujiono Wahyu Purnomo).
Pantai Wates merupakan salah satu pantai pasir putih yang menjadi tujuan
destinasi wisata di Kabupaten Rembang. Tingginya aktivitas manusia di sekitar
pantai seperti kegiatan wisata, pemukiman penduduk, pertambakan dan kegiatan
industri, dikhawatirkan dapat menyebabkan perubahan kualitas perairan terutama
kandungan unsur hara. Unsur hara dalam perairan akan berdampak terhadap
kelimpahan fitoplankton dan kandungan klorofil-a. Penelitian ini bertujuan untuk
mengetahui kelimpahan fitoplankton, konsentrasi, sebaran, dan hubungan antara
klorofil-a, nitrat dan ortofosfat, serta mengkaji status kesuburan perairan di perairan
Pantai Wates Kabupaten Rembang. Penelitian dilaksanakan pada bulan April 2022.
Metode yang digunakan pada penelitian adalah metode deskriptif. Teknik
pengambilan sampel menggunakan metode stratified random sampling pada 9
stasiun. Analisis status kesuburan perairan dengan metode TSI dan sebaran
konsentrasi variabel dengan metode IDW. Analisis data untuk mengetahui
hubungan antar variabel menggunakan regresi linear berganda. Hasil penelitian
menunjukkan kelimpahan fitoplankton berkisar antara 1.077-6.042 sel/L.
Konsentrasi klorofil-a sebesar 2,117-8,376 µg/L, nitrat sebesar 0,9-1,8 mg/L dan
ortofosfat sebesar 0,07-3,79 mg/L dengan sebaran cenderung menurun ke arah laut.
Status kesuburan di perairan Pantai Wates termasuk kategori mesotrofik hingga
eutrofik. Kelimpahan fitoplankton dipengaruhi oleh nitrat dan ortofosfat sebesar
85,1% dengan korelasi sangat kuat, sedangkan klorofil-a dipengaruhi sebesar 52%
dengan korelasi kuat.
Kata Kunci: Fitoplankton, Klorofil-a, Nitrat, Ortofosfat, TSI

ABSTRACT
Clarisa Ika Oktaviana. 26010118120020. Analysis of Trophic State Index Based
on Chlorophyll-a, Nitrate, and Orthophosphate in Wates White Sand Beach,
Kaliori, Rembang. (Max Rudolf Muskananfola dan Pujiono Wahyu Purnomo).
Wates Beach is one of the white sand beaches which is a tourist destination
in Rembang Regency. The high level of human activity around the coast, such as
tourism, residential areas, aquaculture, and industrial activities, is feared to cause
changes in water quality, especially nutrient content. Nutrients in the waters will
have an impact on the abundance of phytoplankton and the content of chlorophylla. This study aims to determine the abundance of phytoplankton, concentration,
distribution, and the relationship between chlorophyll-a, nitrate, and
orthophosphate, as well as to assess the status of water fertility in the waters of
Wates Beach, Rembang Regency. The research was conducted in April 2022. The
method used in this research is the descriptive method. The sampling technique
used a stratified random sampling method at 9 stations. Analysis of the fertility
status of the waters using the TSI method and the distribution of variable
concentrations using the IDW method. Data analysis to determine the relationship
between variables using multiple linear regression. The results showed that the
abundance of phytoplankton ranged from 1,077-6,042 cells/L. The concentration of
chlorophyll-a was 2,117-8,376 µg/L, nitrate was 0.9-1.8 mg/L and orthophosphate
was 0.07-3.79 mg/L with the distribution tending to decrease towards the sea.
Fertility status in the waters of Wates Beach is categorised as mesotrophic to
eutrophic. The abundance of phytoplankton is influenced by nitrate and
orthophosphate by 85.1% with a very strong correlation, while chlorophyll-a is
influenced by 52% with a strong correlation.
Keywords: Chlorophyll-a, Nitrate, Orthophosphate, Phytoplankton, TSI

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