SETIYAWATI, ENDANG (2023) STRUKTUR KOMUNITAS DAN INDEKS KESEHATAN MANGROVE DI PESISIR KABUPATEN DEMAK (23dik458). Undergraduate thesis, Fakultas Perikanan dan Ilmu Kelautan.

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Abstract

ABSTRAK
(Endang Setiyawati. 26040119130098. Struktur Komunitas dan Indeks
Kesehatan Mangrove di Pesisir Kabupaten Demak. Rudhi Pribadi & Bambang
Yulianto).
Mangrove merupakan suatu vegetasi yang tumbuh di garis intertidal atau
garis pasang surut. Mangrove memiliki banyak sekali manfaat mulai dari segi
ekologi maupun dari segi ekonomi. Mangrove dapat berfungsi sebagai penahan
gelombang dan juga pemecah gelombang sehingga bisa mengurangi terjadinya
abrasi pantai. Perubahan yang terjadi di ekosistem mangrove akan berpengaruh
terhadap fungsi ekologis mangrove. Salah satu metode untuk bisa menilai atau
menggambarkan kondisi ekosistem mangrove yaitu dengan melihat struktur
komunitas dan indeks kesehatan mangrove (MHI). Tujuan dari penelitian ini untuk
mengetahui struktur komunitas mangrove dan indeks kesehatan mangrove di Pesisir
Kabupaten Demak. Penelitian ini dilakukan di tiga lokasi yaitu Dukuh Morosari
(MR), Dukuh Bedono (BD), dan Dukuh Timbulsloko (TB). Setiap stasiun
dilakukan tiga pengulangan dengan melakukan pengukuran parameter seperti
diameter pohon, tutupan kanopi (C), tinggi pohon, komposisi mangrove, kerapatan,
indeks keanekaragaman (H’), keseragaman (J’), dominansi (D’), Indeks Nilai
Penting (INP), tutupan sampah, dan jumlah individu anakan (Nsp). Plot
pengamatan memiliki ukuran 10 x 10 m. Metode yang digunakan yaitu metode
deskriptif,
purposive random sampling digunakan sebagai metode penentuan
lokasi pengambilan data. Metode Hemispherical Photography digunakan untuk
menghitung persentase tutupan kanopi dan dibantu dengan software ImageJ. Hasil
penelitian menunjukkan bahwa ditemukan 3 spesies mangrove yaitu Avicennia
marina, Rhizophora mucronata, dan Thespesia populnea. Nilai Kerapatan pohon
berkisar 1.533 – 3.200 ind/ha. Nilai Indeks Keanekaragaman (H’) dan Keseragaman
(J’) di tiga stasiun di Kabupaten Demak termasuk kategori rendah dengan
dominansi tinggi. Persentase tutupan kanopi memiliki nilai rata-rata yaitu 76,2 ±
4,37% termasuk kategori padat. Hasil indeks kesehatan mangrove memiliki nilai
rata-rata 47,7 ± 9,98% sehingga dapat disimpulkan lokasi penelitian ini termasuk
kategori sedang.
Kata Kunci; Mangrove, Indeks Kesehatan Mangrove, Kabupaten Demak, Tutupan
Kanopi, Hemispherical Photography.

ABSTRACT
(Endang Setiyawati. 26040119130098. Structure Community and
Mangrove Health Index in Demak. Rudhi Pribadi & Bambang Yulianto).
Mangrove is a vegetation that grows on the intertidal line or tidal line.
Mangroves have many benefits ranging from ecological and economic aspects.
Mangroves can function as a wave barrier and also break waves so that they can
reduce coastal abrasion. Changes that occur in the mangrove ecosystem will affect
the ecological function of mangroves. One method to be able to assess or describe
the condition of mangrove ecosystems is by looking at community structure and
mangrove health index (MHI). The purpose of this study was to determine the
structure of mangrove communities and mangrove health index in Coastal Demak
Regency. This research was conducted in three locations namely Dukuh Morosari
(MR), Dukuh Bedono (BD), and Dukuh Timbulsloko (TB). Each station was
conducted three repetitions by measuring parameters such as tree diameter, canopy
cover (C), tree height, mangrove composition, density, diversity index (H'),
uniformity (J'), dominance (D'), Important Value Index (INP), litter cover, and
number of individual saplings (Nsp). The observation plot has a size of 10 x 10 m.
The method used is descriptive method, purposive random sampling is used as a
method of determining the location of data collection. Hemispherical Photography
method was used to calculate the percentage of canopy cover and assisted with
ImageJ software. The results showed that 3 mangrove species were found Avicennia
marina, Rhizophora mucronata, and Thespesia populnea.. Tree density values
ranged from 1,533 - 3,200 ind/ha. The value of the Diversity Index (H') and
Uniformity (J') at three stations in Demak Regency is in the low category with high
dominance. The percentage of canopy cover has an average value of 76.2 ± 4,37%
including dense. The results of the mangrove health index have an average value of
47.7 ± 9,98% so it can be concluded that this research location is in the medium
category.
Keywords: Mangrove, Mangrove Health Index, Demak, Hemispherical
Photography, Canopy Cover.

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