Onrizal Onrizal

University of North Sumatra

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Mashhor Mansor

Tarumanagara University

R Rambey

University of North Sumatra

Edward L. Webb

National University of Singapore

Mohammad Saiful Mansor

National University of Malaysia

Serge A. Wich

Liverpool John Moores University

Cecep Kusmana

IPB University

Arida Susilowati

University of North Sumatra

Yasuyuki Watano

Chiba University

Alison K. S. Wee

University of Nottingham Malaysia Campus

N L Auliah

University of North Sumatra

Cooperative Institutions

University of North Sumatra

154

National Institute of Amazonian Research

University of Leeds

IPB University

John Wiley & Sons (United States)

National University of Singapore

Center for International Forestry Research

Wageningen University & Research

Centre de Coopération Internationale en Recherche Agronomique pour le Développement

Université du Québec à Montréal

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IMPLEMENTATION OF MULTI-SYSTEM SILVICULTURE (MSS) TO IMPROVE PERFORMANCE OF PRODUCTION FOREST MANAGEMENT: A CASE STUDY OF PT. SARPATIM, CENTRAL KALIMANTAN

Indonesian Journal of Forestry Research (2018)

Suryanto Suryanto Adi Susilo Onrizal Onrizal M. Andriansyah Teguh Muslim

To date, performance of the management of Indonesian production forests are discouraging. The concession areas, timber production and employment have been decreasing over time. concern on these matter and to improve management, a research was conducted for six years (2008-2013) and resulted in recommendations to implement the Multi-System of Silviculture (MSS) systems. Two products were generated in MSS; criteria and indicator to guide the selection of appropriate silvicultural system and supersilvik, a model to develop the best business plans. This paper evaluates and strengthens the recommendations through the simulation of MSS products in PT. Sarmiento Parakantja Timber (Sarpatim), Central Kalimantan, Indonesia. Various data variables were used, such as thematic maps of forest areas, data of stand, materials, equipments, labors, finances and incomes. Data were processed in a variety of formulations which were connected to each other in model systems to produce a variety of outcomes, such as production, finance, employment and tax contributions. Results offer four options to improve PT. Sarpatim performance, one of which is the best choice. Compared to the former business model under limited silvicultural systems, MSS projected an increase in the use of land, timber production and employment by 151-753%. Implementing MSS will provide a better and healthier finance for company with an increase of NPV up to 193%; as well as for government tax revenues with an increase up to 308%.

Silviculture

10.59465/ijfr.2018.5.1.1-19

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Plant diversity components of agroforestry in Tanjung Botung, Village, Barumun District, Padang Lawas Regency, North Sumatra

IOP Conference Series Earth and Environmental Science (2022)

R Rambey Andrew Satria Lubis Arida Susilowati A B Rangkuti Onrizal Onrizal

Abstract Agroforestry is a land-use pattern that combines crops in one land with spatial and temporal arrangements. This study aims (1) to identify the species components of agroforestry, (2) to analysis the species diversity in agroforestry, and (3) to calculate the benefits of species in agroforestry for the community around Tanjung Botung Village. Based on the results in this research, it is known that there are 33 species of plants found in agroforestry land which consists of 19 families. To determine the type that dominates the growth rate, it is seen from the value of the Important Value Index. The highest IVI level was in the shurbs level namely Elaeis guineensis (56.67), in the seedling level namely Hevea brasiliensis (83.57), in the sapling level namely Durio zibethinus (38.37), in the pole level namely Hevea brasiliensis (68.04) and in tree level namely Hevea brasiliensis (99.69). To find out the level of species diversity was calculated using the Shannon-Wiener Index (H’). From the results of the study, it was concluded that the value of species diversity ranged from 1.63 to 2.35, meaning that the value of species diversity (H’) for all growth levels was categorized as moderate.

Diversity index

Hevea

10.1088/1755-1315/959/1/012003

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Citations (4)

Examples and Problems in Chemical Thermodynamics

Onrizal Onrizal M.Kh. Karapetyants

Source

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The nutritional content of some fruits as feeding sources of Sumatran orangutans

IOP Conference Series Earth and Environmental Science (2019)

Onrizal Onrizal N L Auliah

Abstract Orangutans are classified as frugivore that most of their feeding sources come from fruits. Bukit Lawang forest (BLF) as part of Gunung Leuser National Park (GLNP) is known as the first center for orangutan rehabilitation (COR) established in 1973 and then closed in 1991. To date, the BLF is the orangutan viewing center (OVC). This study aimed to assess the nutritional content of some fruits feed by Sumatran orangutan (SOU) in BLF and to determine the energy adequacy from fruits eaten by SOU. The nutritional content was analyzed by proximate method. There were nine fruits from different tree species as SOU food sources analyzed in this study. According to the nutritional content, the best fruit for orangutan feed was P. lateriflora which the highest content of the fruit was water content (62.13%), followed by carbohydrate (23.81%), protein (13.72%), ash (0.21%) and fat (0.10%). This study indicated that the nutritional requirements of SOU at the BLF were categorized as sufficient. Therefore, no additional feed is needed for SOU in the area, and feeding time session can be eliminated in the OVC Bukit Lawang of GLNP.

Frugivore

Proximate

Energy density

10.1088/1755-1315/374/1/012023

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Citations (4)

Potential carbon storage of Indonesian mangroves

IOP Conference Series Earth and Environmental Science (2021)

M I Maulana N L Auliah Onrizal Onrizal

Abstract Even though it only covers 0.1% of the surface of the continent, mangrove forests recorded as carbon-rich forests on earth. Forest loss and degradation together, especially in the tropics contributes about 12% of the total annual anthropogenic CO 2 emissions. Mangrove forests ecosystem have high carbon storage potential. The study results show that the ratio of carbon to area in mangrove ecosystems is almost 13 times greater than that of tropical rainforest ecosystems in Indonesia. This study has used published data recorded in Google Scholar and Science Direct. Indonesia’s mangroves, with a total area of 3.1 million ha, store a total carbon of 5.2 Gt. The average stand biomass or aboveground biomass is around 407.15 tons ha −1 , storing carbon as much as 191.36 tons ha −1 which is equivalent to the potential for CO 2 absorption (CO 2 e) by mangrove stands of 702.29 tons ha −1 . Papua has the largest mangrove forest in Indonesia that has the potential for CO 2 e. Assessment of carbon storage in soil needs to be done in estimating the total carbon stored in mangrove ecosystems, given the large potential for stored carbon that plays a role in climate change mitigation.

Blue carbon

Carbon fibers

10.1088/1755-1315/782/3/032014

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Ethnobotany of spice plants in Tanjung Botung Village, Barumun District, Padang Lawas Regency, North Sumatra, Indonesia

IOP Conference Series Earth and Environmental Science (2021)

R Rambey Andrew Satria Lubis Arida Susilowati A B Rangkuti Onrizal Onrizal

Abstract Indonesia is one of the largest spice-producing countries in the world. Forests in Indonesia have biodiversity that holds the potential for spices which must always be protected. Community gardens in Tanjung Botung Village in various land-use patterns such as agroforestry gardens, people’s yards are a place to grow various types of spices, both grown wild and deliberat1ely cultivated. This study aims to determine the species of spices and their uses in Tanjung Botung Village, Barumun District, North Sumatra. The research method was carried out by in-depth interviews with 20 respondents of local communities. The respondents were chosen by snowball sampling method. There are 33 species of spice plants used by the community, consisting of 13 (39.4%) tree species and 20 (60.6%) herbs. Part of plant used, namely 18 species of fruit (54%), six species of leaves (18%), three species of rhizome (9%), two species of bark (6%), two species of tubers (6%) and stem of a species (1%).

Ethnobotany

Snowball sampling

10.1088/1755-1315/918/1/012050

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Species composition and structure of ex-burned heath forest in Danau Sentarum National Park, West Kalimantan

Biodiversitas Journal of Biological Diversity (1970)

Onrizal Onrizal Cecep Kusmana Bambang Hero Saharjo IIN PARWATI HANDAYANI Tsuyoshi Kato

The objective of the research was to know species composition and structure of ex-burned heath forest. Field research was carried out from 23 June to 5 July and 10 to 25 September 2004 on the foot-slope of Semujan Hill, Danau Sentarum National Park, West Kalimantan. Ten-sample units (SU) with each size 10 x 10 m are placed based on random sampling method. On each SU, trees with diameter ï‚³ 2 cm cm were identified and the diameter (DBH) and height are recorded. Fourteen tree species were found within a 0.1 ha SU, consisting of 12 genus and 8 families. Tree density is exponentially decreased from trees with small diameter to trees with big diameter.Key words: species composition, forest structure, ex-burned heath forest, Danau Sentarum National Park, West Kalimantan.

Forest structure

10.13057/biodiv/d060410

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Citations (7)

Mangrove Loss Drives Global Warming

Proceedings of the International Conference of Science, Technology, Engineering, Environmental and Ramification Researches (2018)

Onrizal Onrizal Achmad Siddik Thoha Alfan Gunawan Ahmad Mashhor Mansor

10.5220/0010098501020105

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Assessment of oil palm plantation in South Tapanuli using remote sensing and geographic information system in the last three decades

AIP conference proceedings (2020)

Onrizal Onrizal M I Maulana Erman Munır

Oil palm plantations (OPPs) have initiated in Indonesia at the Dutch colonial era. After the reformation era, the OPPs continued to extend widely including in South Tapanuli. However, it is suspected that the expansion of new OPPs by converting natural forests. This study aimed to assess the distribution and extension of OPPs in South Tapanuli using remote sensing (RS) and geographic information system (GIS). Land cover classification was obtained by using supervised classification with maximum likelihood approach in Landsat images of 1989, 1998, 2007 and 2019. The research showed that the OPPs in South Tapanuli have increased nearly 2.5 times in the last three decades that was from 7.56% in 1989 to 18.79% in 2019. This study indicated that some portion of new OPPs by converting natural forests, including in conservation as well as protection forests. This practice is expected to cause disruption of harmony in nature and the human environment, such as increased flooding during rainy season, drought during dry season, landslide as well as human-wildlife conflict. Therefore, land use must be a concern in developing new oil palm plantations in the future. Subsequently, it needs simultaneously to handle the OPPs have been planted on land that is not intended.

Dry season

Wet season

Land Cover

10.1063/5.0003010

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Phylogenetic classification of the world’s tropical forests

Proceedings of the National Academy of Sciences (2018)

Ferry Slik Janet Franklin Víctor Arroyo‐Rodríguez Richard Field Salomón Aguilar

Significance Identifying and explaining regional differences in tropical forest dynamics, structure, diversity, and composition are critical for anticipating region-specific responses to global environmental change. Floristic classifications are of fundamental importance for these efforts. Here we provide a global tropical forest classification that is explicitly based on community evolutionary similarity, resulting in identification of five major tropical forest regions and their relationships: ( i ) Indo-Pacific, ( ii ) Subtropical, ( iii ) African, ( iv ) American, and ( v ) Dry forests. African and American forests are grouped, reflecting their former western Gondwanan connection, while Indo-Pacific forests range from eastern Africa and Madagascar to Australia and the Pacific. The connection between northern-hemisphere Asian and American forests is confirmed, while Dry forests are identified as a single tropical biome.

Floristics

Tropical Asia

Biome

Tropical vegetation

10.1073/pnas.1714977115

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Citations (177)