PRODUKTIVITAS SERASAH DI LAHAN REHABILITASI MANGROVE KELURAHAN SETAPUK BESAR KOTA SINGKAWANG

This study aims to determine the amount of litter production of the amount of carbon (C-org), nitrogen (N), and phosphorus (P) nutrients in the substrate of rehabilitated mangrove forests in Setapuk Besar Village, Singkawang City. Determination of observation points using the purposive sampling method based on mangrove planting years in 2007, 2010, 2013, and 2016. Mangrove leaf litter collection uses a litter trap measuring 1 m x 1m with a periodic retrieval time of every 2 weeks. Data collection of environmental factors is carried out directly in the field at each observation point. Measurements of substrate nutrient content with parameters C-org, N and P were carried out on substrate samples at each observation point for later analysis in the laboratory. The results showed that the productivity of litter in the mangrove rehabilitation area of Setapuk Besar Village, Singkawang City was 7.41 gbk / m2 / day – 0.917 gbk / m2 / day. The largest productivity came from mangroves in 2007 which contributed 56% of the total annual litter production with the largest component coming from the leaf part of the mangrove plant. The highest amount of carbon (C-org), N and P nutrient content was in the 2007 growing year. which shows the successful rehabilitation of mangrove lands increases the fertility of mangrove substrates.Keywords: Litter production, Mangrove, Rehabilitation, Setapuk AbstrakPenelitian ini bertujuan untuk mengetahui jumlah produksi serasah jumlah kandungan unsur hara karbon (C-org), nitrogen (N) dan fosfor (P) pada substrat hutan mangrove rehabilitasi di Kelurahan Setapuk Besar Kota Singkawang. Penentuan titik pengamatan menggunakan metode purposive sampling berdasarkan tahun tanam mangrove tahun 2007, 2010, 2013 dan 2016. Pengumpulan serasah daun mangrove menggunakan litter trap berukuran 1 m x 1m dengan waktu pengambilan berkala disetiap 2 minggu. Pengumpulan data faktor lingkungan dilakukan secara langsung dilapangan pada setiap titik pengamatan. Pengukuran kandungan hara substrat dengan parameter C-org, N dan P dilakukan terhadap sampel substrat di setiap titik pengamatan untuk kemudian dianalisis di laboratorium. Hasil penelitian menunjukkan produktifitas serasah di lahan rehabilitasi mangrove Kelurahan Setapuk Besar Kota Singkawang sebesar 7,41 gbk/m2/hari – 0,917 gbk/m2/hari. Produktivitas terbesar berasal dari mangrove tahun tanam 2007 yang menyumbangkan 56% dari total produksi serasah tahunan dengan komponen terbesar yang berasal dari bagian daun tanaman mangrove.  Jumlah kandungan unsur hara karbon (C-org), N dan P tertinggi berada pada tahun tanam 2007. yang menunjukkan berhasilnya rehabilitasi lahan mangrove ini meningkatkan kesuburan substrat mangrove. Kata Kunci : Mangrove, Produktivitas serasah , Rehabilitasi  Setapuk

Laju Dekomposisi Serasah di Lahan Mangrove Rehabilitasi

This study aims to determine the rate of decomposition and the nutrient content of carbon (C-org), nitrogen (N) and phosphorus (P) of mangrove leaf litter released during the decomposition process. The method used is purposive sampling, where the determination of observation stations is based on the year of mangrove planting, namely 2007, 2010, 2013 and 2016. The analysis of litter decomposition rate uses the Boonruang equation, C-org uses the Walkley & Black method, N uses the Kjeldahl method and P uses the wet destruction method. The results showed that the most significant decomposition rate occurred in the 2016 planting year litter of 71.924%, followed by 2007, 2010 and 2013 planting years with a value of 58,582%, 55,360% and 47,048%, respectively. The highest nutrient content of C-org and P was found in mangroves in the 2010 planting year with values ​​of 50.82 and 0.14 ppm, and the highest N nutrient content was in the 2007 planting year with a value of 1.25%. In conclusion, the mangrove leaf litter during the research was not completely decomposed. The decomposition process in the 2010 planting year had the highest C-org and P-released nutrients. The highest N nutrient content was found in the 2007 planting year. Keywords: Decomposition Rate, Mangrove, Litte

PENDUGAAN STOK KARBON DI KAWASAN HUTAN PENDOPO GUBERNUR KOTA PONTIANAK

Forest is a natural resource that is very important and beneficial for life and living either directly or indirectly. This study aims to determine how much carbon is stored, in the area of Forest City Hall Governor Pontianak. The method used in this study, is non-destructive sampling method with recording the diameter of all the trees on the track 20 m wide and 100 m long using allometric  equation appropriate for estimating biomass. Based on  the research results of carbon estimation stored in Governor City Hall Forest  area with 3.2 ha area there are 38 species of trees with the number of 584 individuals, biomass about 140.62 tons/ha, while for carbon stock from stands about 70.27 tons/ha. Keywords: carbon stock, forest cit

LAJU PENGURAIAN SERASAH DAUN (Rhizophora spp.) DI LAHAN REHABILITASI MANGROVE KELURAHAN SETAPUK BESAR KECAMATAN SINGKAWANG UTARA

The land for mangrove forest rehabilitation in Setapuk Besar Village, North Singkawang District is quite alarming due to abrasion and seawater intrusion. Leaf litter decomposition of Rhizophora spp. produce essential nutrients that function as a source of food and support the life of mangrove plants. The purpose of this study was to calculate the rate of decomposition of leaf litter of mangrove Rhizophora spp. in the rehabilitation area of mangrove forests and obtain the amount of nutrient content (C-organic, N, P) from mangrove leaf litter released during the decomposition process. This study uses a survey method with a purposive technique with reference to the category of planting year (2007, 2010, 2013 and 2016). Rhizophora spp. leaf litter decomposition rate. The highest was found at station II with a value of 0.13 (gr/day) while the lowest decompositcccpion rate was found at stations II, III and IV with a value of 0.12 (gr/day). The highest value of carbon (C-organic) content was found at station II at 52.39%, the lowest value was at station IV at 49.20%. The highest value of nitrogen content was found at station I of 1.21%, while the lowest value was found at station IV at 0.76%. The highest value of phosphorus nutrient content was found at station III of 0.30%, while the lowest value was found at station II of 0.25%.Keywords: Decomposition Rate, Litter, Mangrove  AbstrakLahan rehabilitasi hutan mangrove yang berada di Kelurahan Setapuk Besar Kecamatan Singkawang Utara cukup memprihatinkan yang disebabkan oleh abrasi dan intrusi air laut. Penguraian serasah daun Rhizophora spp. menghasilkan unsur hara yang esensial berfungsi sebagai sumber makanan dan penyangga kehidupan tanaman mangrove. Tujuan dari penelitian ini adalah menghitung nilai laju dekomposisi serasah daun mangrove Rhizophora spp. di lahan rehabilitasi hutan mangrove dan mendapatkan jumlah kandungan unsur hara (C-organik, N, P) dari serasah daun mangrove yang dilepas selama proses terurai. Penelitian ini menggunakan metode survei dengan teknik purposive dengan mengacu pada kategori tahun tanam (2007, 2010, 2013 dan 2016). Laju penguraian serasah daun Rhizophora spp. tertinggi terdapat pada stasiun II dengan nilai sebesar 0,13 (gr/hari) sedangkan untuk laju penguraian terendah terdapat pada stasiun II, III dan IV dengan nilai sebesar 0,12 (gr/hari). Nilai kandungan Karbon (C-organik) tertinggi terdapat pada stasiun II sebesar 52,39%, nilai terendah terdapat pada stasiun   IV sebesar 49,20%. Nilai kandungan Nitrogen yang tertinggi terdapat pada stasiun I sebesar 1,21%, sedangkan nilai terendah terdapat pada stasiun IV sebesar 0,76%. Nilai kandungan unsur hara Posfor tertinggi terdapat pada stasiun III sebesar 0,30%, sedangkan nilai terendah terdapat pada stasiun II sebesar 0,25%.Kata kunci: Laju penguraian, mangrove, serasah, Setapuk Besa

KEANEKARAGAMAN JENIS GASTROPODA DI HUTAN MANGROVE DESA PADANG TIKAR I KECAMATANBATU AMPAR KABUPATEN KUBU RAYA

Gastropods as bioindicators of mangrove ecosystem stability. Information regarding Gastropods in the mangrove forest of Padang Tikar I Village and environmental changes are thought to influence the existence and abundance of Gastropod species. It is necessary to research the diversity of Gastropod species in the mangrove forests of Padang Tikar I Village, Batu Ampar District, Kubu Raya Regency. The research aims to calculate the diversity index of Gastropod species in the mangrove forest ecosystem in Padang Tikar I Village. The research uses a survey method, purposive sampling, and systematic data collection techniques, namely a combination of three grid lines. The identification results found 13 types of Gastropods from 7 families, namely Ellobiidae, Littorinidae, Muricidae, Neritidae, Nassariidae, Naticidae, and Potamididae. The gastropods that were often found were Nassarius stolatus on line one, Littorina scabra on line two, and Cerithidea cingulata on line three. The type with the greatest abundance is Cerithidea cingulata 45 ind/m2 dan Littorina scabra 14 ind/m2. Gastropod diversity in each route is in the low category. Some types dominate in line two, namely Littorina scabra and line three Cerithidea cingulata. The evenness of Gastropods in line one includes stable criteria, while lines two and three are unstable. The highest criteria type similarity is 57% in lines two and three, in lines one and two, and lines one and three 0%.Keywords: Abundance, Diversity, Gastropods, Mangrove.AbstrakGastropoda sebagai bioindikator kestabilan ekosistem mangrove. Informasi mengenai Gastropoda di hutan mangrove Desa Padang Tikar I dan perubahan lingkungan diduga mempengaruhi keberadaan dan kelimpahan jenis Gastropoda, perlu dilakukannya penelitian tentang keanekaragaman jenis Gastropoda di hutan mangrove Desa Padang Tikar I Kecamatan Batu Ampar Kabupaten Kubu Raya. Tujuan penelitian menghitung indeks keanekaragaman jenis Gastropoda pada ekosistem hutan mangrove di Desa Padang Tikar I. Penelitian menggunakan metode survei, teknik pengumpulan data secara purposive sampling dan sistematik yaitu metode kombinasi jalur garis berpetak sebanyak tiga jalur. Hasil identifikasi ditemukan 13 jenis Gastropoda dari 7 famili yaitu Ellobiidae, Littorinidae, Muricidae, Neritidae, Nassariidae, Naticidae, Potamididae. Gastropoda yang banyak dijumpai Nassarius stolatus pada jalur satu, Littorina scabra pada jalur dua, dan Cerithidea cingulata pada jalur tiga. Jenis dengan kelimpahan terbesar Cerithidea cingulata 45 ind/m2 dan Littorina scabra 14 ind/m2. Keanekaragaman Gastropoda pada tiap jalur termasuk kategori rendah. Terdapat jenis yang mendominasi pada jalur dua yaitu Littorina scabra dan jalur tiga Cerithidea cingulata. Kemerataan Gastropoda jalur satu termasuk kriteria stabil sedangkan jalur dua dan tiga labil. Kesamaan jenis kriteria tertinggi 57% jalur dua dan tiga, pada jalur satu dan dua serta jalur satu dan tiga 0%. Kata Kunci: Gastropoda, Keanekaragaman, Kelimpahan, Mangrov

PERTUMBUHAN TANAMAN BAKAU (Rhizophora spp.) DI KAWASAN MANGROVE KELUR AHAN SETAPUK BESAR KOTA SINGKAWANG

Mangrove forests are natural resources that have an important role for living things in the sea and on land. Because the location of mangrove forests is very specific, has an enormous ecological role, and has high socio-economic value potency. Economically, these ecosystems are a source of non-timber forest products for the local community, in addition to the benefits of environmental services, and physically play a role in preventing abrasion. The purpose of this study was to obtain information about the growth of mangrove plants In the mangrove area of Setapuk Besar Village, Singkawang City. The benefit of this research is that this research is expected to provide useful information, especially for area managers and also for other researchers who will conduct more basic research on the growth of mangrove plants This research is expected to support development activities in the mangrove area of Setapuk Besar Village, Singkawang City. The research method used was a survey with a plot technique that was placed systematically. Plant samples taken came from the 2015-2018 planting year, mangrove growth data plant Was obtained from direct measurements and observations of the object of research in the field. Every year of planting, 5 plots measuring 3x3 meters were made. All the plants in the measuring plots were taken with measurement samples. The results showed that the average diameter growth in plants those aged 5 years, 4 years, 3 years and 2 years were 3.25 cm, 2.5 cm, 2.06 cm and 1.46 cm respectively. Meanwhile, the average height growth rate was high in plant those aged 5 years, 4 years, 3 years and 2 years respectively are 255.53 cm, 239.35 cm, 146.01 cm and 92.22 cm.Keywords: Diameter and height growth, Mangrove, systematic samplingAbstrakHutan mangrove merupakan sumberdaya alam yang memiliki peran penting untuk mahluk hidup yang hidup di laut maupun di darat. Karena letak hutan mangrove yang sangat spesifik, peranan ekologis, dan berpotensi memiliki nilai sosial ekonomis tinggi. Secara ekonomis, ekosistem ini  merupakan sumber hasil hutan bukan kayu bagi masyarakat setempat, disamping selain manfaat jasa lingkungan dan secara fisik berperan mencegah terjadinya abrasi. Tujuan penelitian ini adalah  mendapatkan informasi tentang pertumbuhan tanaman bakau di kawasan mangrove Kelurahan Setapuk Besar Kota Singkawang. Manfaat Penelitian ini diharapkan dapat memberikan informasi yang berguna terutama bagi pengelola kawasan dan juga kepada peneliti-peneliti lain yang akan melakukan penelitian lebih mendasar mengenai pertumbuhan tanaman bakau. Penelitian ini diharapkan dapat mendukung kegiatan pengembangan di kawasan mangrove Kelurahan Setapuk Besar Kota Singkawang. Metode penelitian yang digunakan adalah survei dengan teknik petak ukur yang diletakkan secara  sistematis. Sampel tanaman yang diambil berasal dari tahun tanam 2015-2018. Data pertumbuhan bakau diperoleh dari pengukuran dan pengamatan secara langsung terhadap objek penelitian di lapangan. Setiap tahun tanam di buat 5 petak berukuran 3x3 meter. Semua tanaman yang terdapat di dalam petak ukur diambil sampel pengukuran. Hasil penelitian menunjukkan bahwa rerata pertumbuhan diameter pada tanaman bakau yang berumur 5 tahun, 4 tahun, 3 tahun dan 2 tahun berturut-turut sebesare 3,25 cm, 2,5 cm, 2,06 cm dan 1,46 cm. Sedangkan rerata pertumbuhan tinggi rerata tinggi pada tanaman Rhizophora spp. yang berumur 5 tahun, 4 tahun, 3 tahun dan 2 tahun berturut-turut sebesar  255,53 cm, 239,35 cm, 146,01 cm dan 92,22 cm.Kata Kunci: Mangrove, pertumbuhan diameter dan tinggi, sistematik samplin

DESKRIPSI VEGETASI ZONA INTI PANTAI PENELURAN PENYU, DESA SEBUBUS, KABUPATEN SAMBAS

Vegetation is one of the components that affect turtle habitat.Therefore, it is necessary to know the vegetation that becomes a character for turtles in the process of laying eggs.This observation aims to identify the types of vegetation in some sectors of landing egg-laying turtles.The method carried out is a direct survey on the ground, and the results obtained found 10 types of vegetation from the same three sectors including tree habitus, perdu and herbaceous.Pandanus tectorius, Scaevolla taccada, and Hibiscus tiliaceus are the dominant species in the sector.Keywords: turtle habitat, vegetationAbstrakVegetasi merupakan salah satu komponen yang berpengaruh bagi habitat penyu. Oleh karena itu perlu diketahui vegetasi yang menjadi karakter bagi penyu dalam melakukan proses bertelur. Pengamatan ini bertujuan untuk identifikasi jenis-jenis vegetasi pada beberapa sektor mendaratnya penyu bertelur. Metode yang dilakukan adalah survey langsung di lapangan, dan hasil yang diperoleh ditemukan 10 jenis vegetasi yang sama dari ketiga sektor diantaranya habitus pohon, perdu dan herba. Pandanus tectorius, Scaevolla taccada, dan Hibiscus tiliaceus merupakan spesies yang mendominasi di sektor tersebut.Kata Kunci: habitat penyu, vegetasi