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LAPORAN PRAKTIKUM KONSERVASI SUMBERDAYA PERIKANAN ACARA IKONSERVASI MANGROVE

Disusun Oleh: Brifnita Karlina R. 11517

JURUSAN PERIKANAN FAKULTAS PERTANIAN UNIVERSITAS GADJAH MADA YOGYAKARTA 2011

PENDAHULUANLatar Belakang Pesisir merupakan wilayah perbatasan antara daratan dan laut, oleh karena itu wilayah ini dipengaruhi oleh proses-proses yang ada di darat maupun yang ada di laut. Wilayah demikian disebut sebagai ekoton, yaitu daerah transisi yang sangat tajam antara dua atau lebih komunitas (Odum, 1983 dalam Kaswadji, 2001). Sebagai daerah transisi, ekoton dihuni oleh organisme yang berasal dari kedua komunitas tersebut, yang secara berangsur-angsur menghilang dan

diganti oleh spesies lain yang merupakan ciri ekoton, dimana seringkali kelimpahannya lebih besar dari dari komunitas yang mengapitnya. Sebagai salah satu ekosistem pesisir, hutan mangrove merupakan ekosistem yang unik dan rawan. Ekosistem ini mempunyai fungsi ekologis dan ekonomis. Fungsi ekologis hutan mangrove antara lain pelindung garis pantai, mencegah intrusi air laut, habitat (tempat tinggal), tempat mencari makan (feeding ground), tempat asuhan dan pembesaran (nursery ground), tempat pemijahan (spawning ground) bagi aneka biota perairan, serta sebagai pengatur iklim mikro. Sedangkan fungsi ekonominya antara lain penghasil keperluan rumah tangga, penghasil keperluan industri, dan penghasil bibit. Sebagian manusia dalam memenuhi keperluan hidupnya dengan mengintervensi ekosistem mangrove. Hal ini dapat dilihat dari adanya alih fungsi lahan (mangrove) menjadi tambak, pemukiman, industri, dan sebagainya maupun penebangan oleh masyarakat untuk berbagai keperluan. Dampak ekologis akibat berkurang dan rusaknya ekosistem mangrove adalah hilangnya berbagai spesies flora dan fauna yang berasosiasi dengan ekosistem mangrove, yang dalam jangka panjang akan mengganggu keseimbangan ekosistem mangrove khususnya dan ekosistem pesisir umumnya. Beberapa kegiatan yang berkaitan dengan kelestarian mangrove perlu digalangkan untuk mencapai perikanan yang berkelanjutan. . Tujuan Memberikan pemahaman tentang vegetasi yang ada di ekosistem mangrove Mengetahui karakteristik hutan mangrove di Tahuna,Bali Manfaat Melatih mahasiswa agar mampu memberikan gambaran mengenai pengaruh atau peranan suatu jenis tumbuhan mangrove dalam komunitas mangrove. D. Waktu dan Tempat Praktikum Konservasi Sumberdaya Perikanan Acara Konservasi Mangrove dilaksanakan pada: Praktikum Lapangan Hari / tanggal : Minggu, 17 April 2011

Jam Tempat

: 09.00 WITA selesai : Kawasan Wisata Hutan Mangrove , Tahura, Ngurah Rai Bali

Pengamatan, Pengukuran pH dan Salinitas Hari / tanggal : Kamis, 21 April 2011 Jam Tempat perikanan, Fakultas pertanian, Universitas Gadjah Mada, Yogyakarta. : 13.30 selesai : Laboratorium Manajemen Sumberdaya perikanan, Jurusan

TINJAUAN PUSTAKA Taman Wisata Alam Prapat Benoa ditetapkan sebagai TAHURA Ngurah Rai berdasarkan Keputusan Menteri Kehutanan No. 544/Kpts-II/1993 tanggal 25 September 1993 dengan luas 1.373,50 Ha. TAHURA Ngurah Rai secara administrasi pemerintahan terletak di Kecamatan Kuta Kabupaten Badung dan Kecamatan Denpasar Kotamadya Denpasar Propinsi Bali, sedangkan secara geografis TAHURA Ngurah Rai terletak pada 1159-11514 Bujur Timur dan 849 Lintang Selatan. Pengelolaan kawasan berada pada Sub Seksi KSDA Badung, Sub Balai Konservasi Sumber Daya Alam Bali, Kanwil Departemen Kehutanan Propinsi Bali. Sedangkan secara keseluruhan memiliki konfigurasi lapangan dimana darat dipengaruhi oleh pasang surut

air laut dan lereng menurun ke arah timur, dengan ketinggian antara 0-3 m di atas permukaan laut (Anonim,2011). Hutan mangrove merupakan hutan yang terdapat di daerah pantai yang selalu atau secara teratur tergenang air laut dan terpengaruh oleh pasang surut air laut tetapi tidak terpengaruh oleh iklim. Sedangkan daerah pantai adalah daratan yang terletak di bagian hilir Daerah Aliran Sungai (DAS) yang berbatasan dengan laut dan masih dipengaruhi oleh pasang surut, dengan kelerengan kurang dari 8% (Departemen Kehutanan, 1994 dalam Santoso, 2000). Menurut Nybakken (1992), hutan mangrove adalah sebutan umum yang digunakan untuk menggambarkan suatu varietas komunitas pantai tropik yang didominasi oleh beberapa spesies pohon-pohon yang khas atau semak-semak yang mempunyai kemampuan untuk tumbuh dalam perairan asin. Hutan mangrove meliputi pohon-pohon dan semak yang tergolong ke dalam 8 famili, dan terdiri atas 12 genera tumbuhan berbunga: Avicennie, Sonneratia, Rhyzophora, Bruguiera, Ceriops, Xylocarpus, Lummitzera, Laguncularia, Aegiceras, Aegiatilis, Snaeda, dan Conocarpus (Bengen,2000). Kata mangrove mempunyai dua arti, pertama sebagai komunitas, yaitu komunitas atau masyarakat tumbuhan atau hutan yang tahan terhadap kadar garam/salinitas (pasang surut air laut); dan kedua sebagai individu spesies (Macnae, 1968 dalam Supriharyono, 2000). Supaya tidak rancu, Macnae menggunakan istilah mangal apabila berkaitan dengan komunitas hutan dan mangrove untuk individu tumbuhan. Hutan mangrove oleh masyarakat sering disebut pula dengan hutan bakau atau hutan payau. Namun menurut Khazali (1998), penyebutan mangrove sebagai bakau nampaknya kurang tepat karena bakau merupakan salah satu nama kelompok jenis tumbuhan yang ada di mangrove. Ekosistem mangrove adalah suatu sistem di alam tempat berlangsungnya kehidupan yang mencerminkan hubungan timbal balik antara makhluk hidup dengan lingkungannya dan diantara makhluk hidup itu sendiri, terdapat pada wilayah pesisir, terpengaruh pasang surut air laut, dan didominasi oleh spesies pohon atau semak yang khas dan mampu tumbuh dalam perairan asin/payau (Santoso, 2000). Dalam suatu paparan mangrove di suatu daerah tidak harus terdapat semua jenis spesies mangrove (Hutching and Saenger, 1987 dalam Idawaty, 1999). Formasi hutan mangrove dipengaruhi oleh beberapa faktor seperti kekeringan, energi gelombang, kondisi pasang surut,

sedimentasi, mineralogi, efek neotektonik (Jenning and Bird, 1967 dalam Idawaty, 1999). Sedangkan IUCN (1993), menyebutkan bahwa komposisi spesies dan karakteristik hutan mangrove tergantung pada faktor-faktor cuaca, bentuk lahan pesisir, jarak antar pasang surut air laut, ketersediaan air tawar, dan tipe tanah. Hutan mangrove juga dapat dibagi menjadi zonasi-zonasi berdasarkan jenis vegetasi yang dominan, mulai dari arah laut ke darat sebagai berikut: Zona Avicennia, terletak paling luar dari hutan yang berhadapan langsung dengan laut. Zona ini umumnya memiliki substrat lumpur lembek dan kadar salinitas tinggi. Zona ini merupakan zona pioner karena jenis tumbuhan yang ada memilliki perakaran yang kuat untuk menahan pukulan gelombang, serta mampu membantu dalam proses penimbunan sedimen. Zona Rhizophora, terletak di belakang zona Avicennia. Substratnya masih berupa lumpur lunak, namun kadar salinitasnya agak rendah. Mangrove pada zona ini masih tergenang pada saat air pasang. Zona Bruguiera, terletak di balakang zona Rhizophora dan memiliki substrat tanah berlumpur keras. Zona ini hanya terendam pada saat air pasang tertinggi atau 2 kali dalam sebulan. Zona Nypa, merupakan zona yang paling belakang dan berbatasan dengan daratan (Pramudji, 2000) 0100090000038e9e01000000d9bc000000001610000026060f002220574d464301000000 000001004026000000000f000000002000006ca001006cc00100010000006c000000000000000 00000008f010000ee000000000000000000000015370000fc20000020454d46000001006cc0010 00c00000001000000000000000000000000000000000400005802000069010000d40000000000 000000000000000000001c830500d23a0300460000002c00000020000000454d462b014001001 c000000100000000210c0db010000006000000060000000460000002045000014450000454d46 2b224004000c000000000000001e4009000c00000000000000244001000c00000000000000304 0020010000000040000000000803f214007000c00000000000000084000056c44000060440000 0210c0db010000000000000000000000000000000000000001000000ffd8ffe000104a46494600 010100000100010000fffe003b43524541544f523a2067642d6a7065672076312e302028757369 6e6720494a47204a50454720763632292c207175616c697479203d2036390affdb0043000a0707 0907060a0908090b0b0a0c0f19100f0e0e0f1e161712192420262523202322282d3930282a362b

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menjadi energi yang dapat dimanfaatkan oleh sejumlah spesies, baik yang mempunyai nilai ekonomi maupun yang subsistem, termasuk udang-udang dari famili Penaeidae dan famili Sergestidae, kepiting mangrove, Crustaceae lainnya, berbagai spesies ikan, tiram-tiram dan Molusca lainnya, reptilia laut, juga mamalia burung-burung (Dahuri, 1996).

METODOLOGI Alat dan Bahan Termometer pH meter Kompas Global Positioning System (GPS) Tali transek yang dibuat dari tali nylon dengan ukuran 40 meter Meteran plastik ukuran 100 cm Data Sheets Buku tulis Alat tulis Camera Data isian Plastik Botol film

Cara Kerja Praktikum ini dilakukan di Tahura, Ngurah Rai,Bali. Untuk mengetahui keanekaragaman tumbuhan mangrove digunakan metode eksplorasi yang bersifat deskriptif (De Vogel, 1987). Kemudian di identifikasi dengan menggunakan buku Identifikasi Mngrove dan Tumbuhan Berbiji. Untuk mengetahui zonasi vegetasi mangove dilakukan dengan menarik garis transek tegak lurus garis pantai (Begen, 2002). Sedangkan untuk mengetahui struktur komunitas

vegetasi mangrove dilakukan dengan membuat petak kuadrat berukuran 10x10m pada setiap stasiun praktikum, dan dilakukan analisis vegetasi dengan menghitung jumlah jenis, jumlah individu, diameter basal area (DBA) (Begen, 2002). Pada setiap plot dicatat tipe substrat. Pada setiap stasiun pengamatan dicatat dampak dari kegiatan manusia terhadap kondisi ekosistem mangrove. Selanjutnya data dianalisis untuk mengetahui kerapatan jenis (Di),Kerapatan relatif jenis (Fi), Frekuensi relatif jenis(Rfi), Penutupan jenis (Rci), dan nilai penting jenis (INPi). Selain itu diakukan deskripsi kondisi masing-masing stasiun dengan pengamatan fisik seperti suhu air, suhu udara , dan salinitas.

HASIL DAN PEMBAHASAN Hasil (Terlampir) B.Pembahasan Plot I Tahura merupakan kawasan mangrove di daerah Ngurah Rai, Bali. Di stasiun 1 plot 1 terletak pada titik ordinat 0804351 S dan 11501142E. Jenis mangrove yang mendominasi di titik plot 1 ini adalah Rhizopora mucronata Berdasarkan hasil pengamatan pada plot 1 diperoleh pH 7,4 dengan salinitas 270/00 dan suhu udara,suhu airnya yaitu 300, 27,50C. Nilai ini cukup mendukung bagi kehidupan mangrove sehingga dapat tumbuh dengan baik karena masih masuk dalam batas nilai yang masih dapat ditolerir oleh hutan mangrove. Suhu udara dipengaruhi oleh luasan penutupan mangrove atau kerapatan mangrove. Semakin luas penutupan mangrove maka semakin rapat dan semakin rendah suhu udaranya karena sinar matahari akan terhalang oleh mangrove,. Pengukuran suhu air di kawasan hutan bakau dilakukan pada genangan air yang berada di dalam kawasan mangrove stasiun pengamatan. Semakin banyak genangan air yang terkena sinar matahari secara langsung maka suhu air akan tinggi, begitu pula sebaliknya apabila genangan air berada dalam rimbunnya mangrove maka suhu air akan lebih rendah. Plot 1 stasiun 1 terdapat semaian sebanyak 9 pohon dan indukan 1 pohon yaitu

Rhizophor mucornata. Jenis substrat yang mendominasi berupa pasir dengan sedikit lumpur. hal tersebut dikarenakan letaknya yang relatif dekat dengan bibir pantai sehingga lapisan tanahnya berpasir selain itu dari banyaknya pasir yang terambil sebagai sampel substrat dibandingkan lumpur .Hal ini cukup berlawanan dengan teori yang dinyatakan oleh Begen(2002) yaitu jenis substrat yang cocok bagi pertumbuhan mangrove jenis Rhizopora adalah jenis lumpur. Jika teor ini sesuai di lapangan maka bisa juga di tanah lapisan bawah lebih banyak lumpurnya dibandingkan tanah di atas yang justru banyak pairnya. Atau diduga praktikan mengambil substrat di sekitar area yang berpasir mengingat di mangrove pada saat itu debit air yang masuk tinggi sehingga sulitnya praktikan untuk menjangkau dasar perairan. Sedangkan biota yang kami temui pada ekosiste mangrove ini adalah kepiting. Ci merupakan luas penutupan mangrove suatu jenis tertentu terhadap area. Penutupan relatif jenis (RCi) merupakan perbandingan antara luas area penutupan jenis (Ci) dan luas total area penutupan untuk seluruh jenis (C). Nilai penutupan jenis relatif indukan mangrove menunjukkan berapa besarnya jenis tersebut menutupi suatu area atau berapa besar jenis tersebut mendominasi suatu area tertentu. Dari data yang kami perolehyaitu 3,9. Mengingat di plot 2 kami hanya menemukan Sonneratia alba sehingga kami tidak dapat membandingkan tanaman yang berbeda di tempat yang berbeda. Nilai penutupan jenis relative (RCi) diperoleh bahwa sebanyak 100% daerah plot 1 didominasi oleh mangrove jenis Rhizopora mucronata.yang berarti jenis mangrove jelas banyak ditemukan di stasiun 1. Fi merupakan frekuensi jenis maksudnya jumlah besarnya peluang ditemukannya mangrove jenis tertentu disuatu tempat. Pada plot 1 ini terdapat 1 jenis mangrove saja dengan nilai RFi-nya adalah. Hal ini menunjukkan bahwa sebaran mangrove di plot 1 paling banyak. Nilai penting memiliki arti bahwa suatu jenis mangrove memiliki peranan yang penting di dalam ekosistemnya. Nilai penting yang tinggi berarti bahwa jenis tersebut sangat mempengaruhi kestabilan ekosistem. Data yang ada jelas menunjukkan Rhizophora memiliki nili penting sebesar 300. Vegetasi ini peran penting dalam membantu memecah gelombang tinggi sehingga gelombang yang sampai ke daratan dapat dikurangi frekuensinya sehingga kerusakan yang diakibatkan tidak terlalu tinggi. Disamping itu mangrove baik Rhizophus mucronata maupun Sonneratia alba berfungsi sebagai penambat mayat maupun puing-puing baja.

Serasah atau detritus meliputi semua bahan tumbuhan yang sudah mati dan melalui beberapa tahapan dekomposisi dapat menghasilkan energi potensial bagi kehidupan konsumen. Perbedaan produksi serasah dapat dipengaruhi oleh struktur vegetasi, umur tegakan, kondisi geografis (kemiringan) dan perubahan iklim musiman. Apabila vegetasi memiliki kerapatan yang tinggi serta diameter batang yang besar maka akan menghasilkan produksi serasah yang rendah. Kandungan serasah mangrove dapat diketahui dari daun vegetasi mangrove yang berguguran. Daun atau serasah yang ditemukan berupa serasah Sonneratia alba yang diperkirakan terbawa arus sehingga berada di area plot 1 yang tanaman mangrovenya tidak terdapat di plot ini. Stasiun 1 plot 2 terletak pada titik ordinat 0804351 S dan 11501142E Jenis Mangrove yang terdapat di stasiun 1 plot 2 adalah Sonneratia alba. Berdasarkan hasil pengamatan pada plot 2 diperoleh pH 6,9 dengan salinitas 300/00 dan suhu udara,suhu airnya yaitu 300, 280C Berdasarkan hasil pengamatan pada plot 2 diperoleh jenis indukan terdapat 1 pohon dengan jenis semaian sebanyak 5 semaian dan 3 anakan. Ci merupakan luas penutupan mangrove suatu jenis tertentu terhadap area. Penutupan relatif jenis (RCi) merupakan perbandingan antara luas area penutupan (Ci) dan luas total area penutupan untuk seluruh jenis (C). Nilai penutupan jenis relatif indukan mangrove menunjukkan berapa besarnya jenis tersebut menutupi suatu area atau berapa besar jenis tersebut mendominasi suatu area tertentu. Dari data yang kami peroleh yaitu 16,47. Mengingat di plot 2 kami hanya menemukan Sonneratia alba sehingga kami tidak dapat membandingkan tanaman yang berbeda di tempat yang berbeda. Nilai penutupan jenis relative (RCi) diperoleh bahwa sebanyak 100% di daerah plot 2 didominasi oleh mangrove jenis Rhizopora mucronata.yang berarti jenis mangrove jelas banyak ditemukan di stasiun 2. Fi merupakan frekuensi jenis maksudnya jumlah besarnya peluang ditemukannya mangrove jenis tertentu disuatu tempat. Pada plot 2 ini terdapat 1 jenis mangrove saja dengan nilai RFi-nya adalah 100. Hal ini menunjukkan bahwa sebaran mangrove di plot 1 paling banyak. Nilai penting memiliki arti bahwa suatu jenis mangrove memiliki peranan yang penting di dalam ekosistemnya. Nilai penting yang tinggi berarti bahwa jenis tersebut sangat mempengaruhi kestabilan ekosistem. Data yang ada jelas menunjukkan Sonneratia alba memiliki nilai penting sebesar 300. Vegetasi Sonneratia alba memiliki nilai penting bagi

ekosistem mangrove sebagai nursery ground dan feeding ground yang artinya bahwa Sonneratia alba memiliki peran yang lebih penting di dalam ekosistemnya, seperti sebagai pemecah gelombang tinggi, tempat memijah, memelihara anak, mencari makan dan perlindungan berbagai macam ikan atau organisme yang hidup di sekitarnya.. Disamping itu mangrove baik Rhizophus mucronata maupun Sonneratia alba berfungsi sebagai penambat mayat maupun puing-puing baja. Serasah atau detritus meliputi semua bahan tumbuhan yang sudah mati dan melalui beberapa tahapan dekomposisi dapat menghasilkan energi potensial bagi kehidupan konsumen. Perbedaan produksi serasah dapat dipengaruhi oleh struktur vegetasi, umur tegakan, kondisi geografis (kemiringan) dan perubahan iklim musiman. Apabila vegetasi memiliki kerapatan yang tinggi serta diameter batang yang besar maka akan menghasilkan produksi serasah yang rendah. Kandungan serasah mangrove dapat diketahui dari daun vegetasi mangrove yang berguguran. Fi merupakan frekuensi jenis artinya besarnya peluang ditemukannya mangrove jenis tertentu disuatu tempat. Pada plot II terdapat 2 jenis mangrove dengan nilai RFi Sonneratia alba sebesar 100%. Hal ini menunjukkan bahwa sebaran jenis mangrove yang ada dominan dominan Sonneratia alba. Nilai penting memiliki arti bahwa suatu jenis mangrove memiliki peranan yang penting di dalam ekosistemnya. Nilai penting yang tinggi berarti bahwa jenis tersebut sangat mempengaruhi kestabilan ekosistem. Berdasarkan data hasil pengamatan jenis mangrove Sonneratia alba memiliki nilai penting yang paling tinggi yaitu sebesar 161.7 dan nilai penting untuk Rhizopora apiculata adalah sebesar 118.3. Vegetasi Rhizopora apiculata mempunyai peranan penting dalam membantu memecah gelombang tinggi sehingga gelombang yang sampai ke daratan dapat dikurangi frekuensinya sehingga kerusakan yang diakibatkan tidak terlalu tinggi. Sonneratia alba memiliki nilai penting bagi ekosistem mangrove sebagai nursery ground dan feeding ground yang artinya bahwa Sonneratia alba memiliki peran yang lebih penting di dalam ekosistemnya, seperti sebagai pemecah gelombang tinggi, tempat memijah, memelihara anak, mencari makan dan perlindungan berbagai macam ikan atau organisme yang hidup di sekitarnya. Mangrove merupakan salah satu sumberdaya perikanan yang memiliki arti penting

di dalam ekosistemnya. Adanya upaya pemanfaatan yang dilakukan secara terus-menerus tanpa adanya keseimbangan untuk menjaga kelestariannya dapat berkibat pada rusak atau punahnya sumberdaya tersebut. Kerusakan satu jenis sumberdaya akan memberikan dampak pada ketidakseimbangan ekosistem yang lainnya. Guna menghindari adanya kerusakan atau kepunahan hutan mangrove maka pemanfaatan yang dilakukan harus bersifat bertanggung jawab.

V. KESIMPULAN DAN SARAN A. Kesimpulan Balai Pengawasan Hutan Mangrove Ngurah rai, Denpasar, Bali didominasi oleh mangrove jenis mangrove Rhizopora mucronata dan Sonneratia alba. Kawasan hutan mangrove yang berada di Ngurah rai, Denpasar, Bali sistem pengelolaannya baik karena merupakan kawasan yang dilindungi dan dijaga dengan baik. Perbandingan hasil pengamatan plot 1 dan 2 cukup berbeda karena dari kedua plot yang ada jenis tumbuhan yang didapatkan berbeda dan tingkat diversitasnya rendah. Kawasan pengelolaan mangrove yang diamati tercemar oleh sampah dan minyak sebagai dampak kegiatan manusia. B. Saran Hendaknya dilakukan susur pantai untuk membersihkan plastik yang ada di sekitar mangrove dan membuat instalasi untuk penanggulangan minyak dari kegiatan manusia.

DAFTAR PUSTAKA Anonim.2011. Tahura. http://www.dephut.go.id/informasi/twa/tahura/ngurah.htm. diakses

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