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All Journal Jurnal Ilmu Pertanian Indonesia Jurnal Natur Indonesia Jurnal Kelautan Tropis BERITA BIOLOGI JURNAL BIOLOGI INDONESIA Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat BERNAS: Jurnal Pengabdian Kepada Masyarakat Prosiding Konferensi Nasional PKM-CSR International Journal of Agriculture System Global Forest Journal Indonesian Journal of Forestry Research

Onrizal Onrizal

Departemen Kehutanan, Fakultas Pertanian Universitas Sumatera Utara Jin Tri Dharma Ujung.No. 1. Medan 20155.

Author-ID : 337675

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Struktur Vegetasi dan Simpanan Karbon Hutan Hujan Tropika Primer DI Batang Toru, Sumatra Utara Onrizal, Onrizal; Ismail, Ismail; Perbatakusuma, Erwin A.; Sudjito, Herwasono; Supriatna, Jatna; Wijayanto, Iwan H.
JURNAL BIOLOGI INDONESIA Vol 5, No 2 (2008): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

ABSTRACTVegetation structure and carbon stock of primary tropical rain forest at Batang Toru, NorthSumatra. Deforestation and forest degradation contribute for 20 to 25 percent of annual totalcarbon dioxide (CO2) emissions and to be one of substantial factor of climate change or globalwarming. Avoided deforestation into carbon-market regime by reducing emission fromdeforestation and forest degradation (REDD) scheme has been agreed on COP 13 of UNFCCCthat was held in Bali on December 2007. REDD application need reliable scientific basic aboutthe amount of carbon storage in well managed natural forest. The aims of this research were todetect vegetation structure and to estimate aboveground biomass, carbon stock and CO2absorption of primary tropical rain forest at Key Biodiversity Area of Batang Toru ForestBlock, North Sumatra Province by existing allometric equation. We designed 20 sampling plotsof 20 x 20 m in two forest area, i.e. Aek Game-game forest and Aek Silemes forest. All trees 5 cmat diameter at breast height (dbh) and above were measure and identified. From the study, thedistribution of diameter class formed âLâ curve which mean an indication as balanced forest.The aboveground biomass of the forest is 544.4 to 583.0 t/ha in Aek Silemes forest and 604.5 to613.6 t/ha Aek game-game forest. It is equivalent with 272.2 to 291.5 t C/ha or 999.0 to 1,069.9 tCO2/ha in Aek Silemes forest and 302.2 to 306.8 t C/ha or 1,109.2 to 1,125.9 t CO2/ha in Aekgame-game forest. More of carbon stock (>46% for Aek Silemes forest and >58% for Aek gamegameforest) saved within dbh of trees 50 cm and above. Therefore, sustainable managementof forest ecosystem is very important to reduce CO2 emission from deforestation and forestdegradation and to improve the function of forest ecology and economy.Keywords: aboveground biomass, carbon stock, CO2, primary tropical rain forest, BatangToru-North Sumatra

Perubahan Tutupan Hutan Mangrove di Pantai Timur Sumatera Utara Periode 1977-2006 Onrizal, Onrizal
JURNAL BIOLOGI INDONESIA Vol 6, No 2 (2010): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jbi.v6i2.3154

ABSTRACTLand-cover change of mangrove forests at eastern coast of North Sumatra in Period 1977 to2006. Mangrove is one of the worldâs threatened major tropical environments. Nevertheless,activities that contribute to this depletion continue. The main objectives of this research wereto analyze the land cover change of mangrove forests in eastern coastal of North Sumatrabased on previous inventory in period 1997 to 2006 and to acquire the factors of mangrovedisturbance in the areas. In fact, mangrove forest areas in eastern coastal of North Sumatradecreased 59.68% from 103,425 ha in 1977 to 41,700 ha in year 2006. Expansion of aquacultureponds and extraction of timber and fuel wood were most important factors of mangrove forestdegradation in the areas. Therefore, we need to rehabilitate the degraded mangrove forests inthe area both massively and systematically, and to prevent the remaining mangrove forestsfrom destruction activities.Keywords: mangroves, land-cover change, North Sumatra

STRUKTUR DAN KEKAYAAN JENIS TUMBUHAN MANGROVE PASCA-TSUNAMI DI PULAU NIAS Onrizal, Onrizal; Kusmana, Cecep
BERITA BIOLOGI Vol 9, No 4 (2009)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Mangroves is an essential natural resources and vital component tor coastal areas both ecology and socio-economic.Adapted mangrove vegetation on tsunami disaster is important information for mangrove rehabilitation post-tsunami.The aim of the research was to determine the structure and species richness of mangrove vegetation post-tsunami in Aceh and Nias Island by vegetation analyses and inventory methods, field survey was carried out in March 2005 - three months after tsunami disaster.We found 20 adapted mangrove species post-tsunami in Nias island, dominated by Rhizophora apiculata. Land system of KJP was compound of 17 adapted mangrove species, and land system of PTG and KHY were each compound of 7 adapted mangrove species, Based on our research, we recommended that R. apiculaw is the first priority species to be used for mangrove rehabilitation in Nias island.

Keanekaragaman Makrozoobenthos pada Hutan Mangrove yang Direhabilitasi di Pantai Timur Sumatera Utara ', Onrizal; Simarmata, Fernades SP; Wahyuningsih, Hesti
Jurnal Natur Indonesia Vol 11, No 2 (2009)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Macrozoobenthos is a group of important fauna in mangrove ecosystem. Mangrove rehabilitation is required toincrease biodiversity and density of fauna, including macrozoobenthos. The aim of this research was to studyinfluence of biotic and abiotic factors to diversity and abundance of macrozoobenthos. The research was conductedat natural and rehabilitated mangrove forest in Percut Sei Tuan, east coastal of North Sumatra. The results showedthat density of macrozoobenthos were significantly correlated to the soil texture, soil organic carbon and pH.Besides, macrozoobenthos diversity was mostly influenced by stand basal area, salinity and silt proportion of soiltexture.

STRUKTUR VEGETASI DAN SIMPANAN KARBON HUTAN HUJAN TROPIKA PRIMER DI BATANG TORU, SUMATRA UTARA Onrizal, Onrizal; Ismail, Ismail; Perbatakusuma, Erwin A.; Sudjito, Herwasono; Supriatna, Jatna; Wijayanto, Iwan H.
JURNAL BIOLOGI INDONESIA Vol 5, No 2 (2008): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jbi.v5i2.3197

ABSTRACTVegetation structure and carbon stock of primary tropical rain forest at Batang Toru, NorthSumatra. Deforestation and forest degradation contribute for 20 to 25 percent of annual totalcarbon dioxide (CO2) emissions and to be one of substantial factor of climate change or globalwarming. Avoided deforestation into carbon-market regime by reducing emission fromdeforestation and forest degradation (REDD) scheme has been agreed on COP 13 of UNFCCCthat was held in Bali on December 2007. REDD application need reliable scientific basic aboutthe amount of carbon storage in well managed natural forest. The aims of this research were todetect vegetation structure and to estimate aboveground biomass, carbon stock and CO2absorption of primary tropical rain forest at Key Biodiversity Area of Batang Toru ForestBlock, North Sumatra Province by existing allometric equation. We designed 20 sampling plotsof 20 x 20 m in two forest area, i.e. Aek Game-game forest and Aek Silemes forest. All trees 5 cmat diameter at breast height (dbh) and above were measure and identified. From the study, thedistribution of diameter class formed ?L? curve which mean an indication as balanced forest.The aboveground biomass of the forest is 544.4 to 583.0 t/ha in Aek Silemes forest and 604.5 to613.6 t/ha Aek game-game forest. It is equivalent with 272.2 to 291.5 t C/ha or 999.0 to 1,069.9 tCO2/ha in Aek Silemes forest and 302.2 to 306.8 t C/ha or 1,109.2 to 1,125.9 t CO2/ha in Aekgame-game forest. More of carbon stock (>46% for Aek Silemes forest and >58% for Aek gamegameforest) saved within dbh of trees 50 cm and above. Therefore, sustainable managementof forest ecosystem is very important to reduce CO2 emission from deforestation and forestdegradation and to improve the function of forest ecology and economy.Keywords: aboveground biomass, carbon stock, CO2, primary tropical rain forest, BatangToru-North Sumatra

PERUBAHAN TUTUPAN HUTAN MANGROVE DI PANTAI TIMUR SUMATERA UTARA PERIODE 1977-2006 Onrizal, Onrizal
JURNAL BIOLOGI INDONESIA Vol 6, No 2 (2010): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jbi.v6i2.3154

ABSTRACTLand-cover change of mangrove forests at eastern coast of North Sumatra in Period 1977 to2006. Mangrove is one of the world?s threatened major tropical environments. Nevertheless,activities that contribute to this depletion continue. The main objectives of this research wereto analyze the land cover change of mangrove forests in eastern coastal of North Sumatrabased on previous inventory in period 1997 to 2006 and to acquire the factors of mangrovedisturbance in the areas. In fact, mangrove forest areas in eastern coastal of North Sumatradecreased 59.68% from 103,425 ha in 1977 to 41,700 ha in year 2006. Expansion of aquacultureponds and extraction of timber and fuel wood were most important factors of mangrove forestdegradation in the areas. Therefore, we need to rehabilitate the degraded mangrove forests inthe area both massively and systematically, and to prevent the remaining mangrove forestsfrom destruction activities.Keywords: mangroves, land-cover change, North Sumatra

komposisi jenis dan struktur hutan hujan tropika dataran rendah di taman nasional danau sentarum, kalimantan barat Cecep Kusmana; Bambang Hero Saharjo; Basuki Sumawinata; . Onrizal; Tsuyoshi Kato
Jurnal Ilmu Pertanian Indonesia Vol. 14 No. 3 (2009): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1412.797 KB)

The objective of this research was to obtain information on species composition and structure of lowland tropical rain forest in Sentarum lake National Park, West Kalimantan. The research was carried out from 26 to 31 December 2003 and from 20 January to 5 February 2004 on the foot slope of Semujan Hill in Sentarum lake National Park. To carry out the research, 10 sample units {SU'S) with size of 10 m x 10 m each, were placed, based on systematic sampling with random start scheme, with distance of 10 m between each SU. On each SU, trees with diameter~ 2 em were identified and diameter {DBH) and height were recorded. Eighty four {84) tree species were found in a 0.1 ha SU, consisting of 32 families, dominated by 16 species of Dipterocarpaceae, followed by 9 species of Guttiferae and 5 species of Melastomataceae. Tree density decreased exponentially with increasing the diameter of trees.

STRUKTUR DAN KEKAYAAN JENIS TUMBUHAN MANGROVE PASCA-TSUNAMI DI PULAU NIAS Onrizal Onrizal; Cecep Kusmana
BERITA BIOLOGI Vol 9, No 4 (2009)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/beritabiologi.v9i4.2005

Tantangan Merintis Kemitraan Ekowisata Mangrove: Lesson Learning Bersama Masyarakat Pesisir Belawan Pindi Patana; Achmad Delianur Nasution; Zulham Afandi Harahap; Prihatin Lumbanraja; Arlina Nurbaity Lubis; Onrizal Onrizal; Rudi Hartono; Indra Aulia
Prosiding Konferensi Nasional Pengabdian Kepada Masyarakat dan Corporate Social Responsibility (PKM-CSR) Vol 3 (2020): Peran Perguruan Tinggi dan Dunia Usaha Dalam Pemberdayaan Masyarakat Untuk Menyongsong
Publisher : Asosiasi Sinergi Pengabdi dan Pemberdaya Indonesia (ASPPI)

Masyarakat Kampung Nelayan Seberang Belawan sudah ada sejak 1957. Sejumlah nelayan awalnya menjadikan pinggiran hutan mangrove di Pesisir Belawan sebagai tempat singgah sementara selama melaut, namun seiring waktu kini berkembang menjadi perkampungan nelayan. Kehidupan nelayan pesisir masih sangat tradisonal dan cenderung marginal dari kegiatan pembangunan. Mereka mengandalkan penghidupan dari hasil tangkapan laut seperti ikan, kepiting dan udang. Keberadaan hutan mangrove yang berstatus hutan lindung dan hutan produksi terbatas di sekitar perkampungan nelayan belum banyak berdampak terhadap kesejahteraan. Bahkan di tahun 2000an banyak yang memanfaatkan mangrove secara illegal untuk dibuat menjadi arang, sehingga menurunkan produktivitas tangkapan laut serta mengancam kelestarian lingkungan. Kegiatan pengabdian kepada masyarakat dengan konsep Desa Binaan USU di Pesisir Belawan ini dirancang dengan tujuan untuk meningkatkan kesejahteraan nelayan melalui pemanfaatan jasa lingkungan ekowisata hutan mangrove berbasis ekonomi masyarakat. Metoda yang digunakan LPPM USU yaitu memfasilitasi pembentukan kelembagaan wisata dengan pola kemitraan nelayan dan Dinas Kehutanan Provinsi Sumatera Utara serta pelatihan pengelolaan ekowisata. Analisis potensi wisata menunjukkan hutan mangrove sangat terbuka untuk dikembangkan menjadi ekowisata di Pesisir Belawan. Pengelolaan ekowisata diharapkan menjadi pintu akses masyarakat terhadap pemanfaatan hutan mangrove secara legal serta adanya alternatif penghidupan yang berkelanjutan.

Resiliency of Singkil Coastal Vegetation due to Natural Catastrophes Onrizal Onrizal; Mashhor Mansor; Nurdin Sulistiyono
International Journal of Agriculture System VOLUME 3 ISSUE 2, DECEMBER 2015
Publisher : Hasanuddin University

Aceh Singkil west coast of Northern Sumatra was affected by natural catastrophes both tsunami and coastal deformation. Apparently most of the inter-tidal vegetation communities suffered because of the inundation intensity and duration changed. Investigation was carried on the structure and composition of littoral and mangrove forests in Singkil coast for 52 and 49 months after the 2004 and 2005 natural catastrophes, respectively. In each vegetation type, data were collected from four sampling plots, each measuring 30 m x 30 m. The sampling plots were separated into 10 m x 10 m sub-plots for matured trees and 5 m x 5 m sub-plots for smaller trees or shrubs. All plants within the subplots were identified and counted. Pure stand of littoral forests were dominated by Casuariana equisetifolia in the mature stage and Cerbera manghas in regeneration stages as natural regeneration. In the mangrove area, most of the mangrove trees such as Bruguiera gymnorrhiza, B. parviflora, and Rhizophora apiculata dead. Sonneratia caseolaris was higher survival rate compared than mangrove trees. B. gymnorrhiza seedlings were growing well. Mangrove palm Nypa fruticans populations were recorded growing well and with a good resiliency and persistence. In fact some of coastal vegetations both in coastal dry lands and in wetland forests have a good capacity to naturally restore and grow after the environmental destruction. From ecological point of view, these plant species should be selected for rehabilitation program in the natural catastrophes both tsunami and coastal subsidence as the impact of large earthquake could be reduced.

Co-Authors Achmad Delianur Nasution Achmad Siddik Thoha Adi Susilo Agus Purwoko Alfan Gunawan Ahmad Ananingtyas S Darmarini Andriansyah, M. Anisa, Amalda Siti Arlina Nurbaity Lubis Audah, Kholis Abdurachim Bambang Hero Saharjo Basuki Sumawinata Bhatara, Aditya Cecep Kusmana Desrita Desrita Diana Sofia Hanafiah Fernades SP Simarmata Hesti Wahyuningsih Indra Aulia Ismail Ismail Jatna Supriatna M. Jufri, M. Jufri Marpaung, Abdullah Muzi Mashhor Mansor Muhdi Muhdi Muslim, Teguh Nurdin Sulistiyono Perbatakusuma, Erwin A. Perbatakusuma, Erwin A. Permana, Tabligh Pindi Patana Prihatin Lumbanraja Rahmanta Rahmanta, Rahmanta Ridwanti, Batubara Rudi Hartono Samsuri Sudjito, Herwasono Sudjito, Herwasono Suryanto Suryanto Tika Yuana Sari Tsuyoshi Kato Wijayanto, Iwan H. Wijayanto, Iwan H. Yundari, Yundari Zulham Afandi Harahap

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