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All Journal Jurnal Ilmu Pertanian Indonesia MEDIA KONSERVASI Journal of Sylva Indonesiana Jurnal Natural
Julius Paolo Siregar
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Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Education Energy Immunology & microbiology Neuroscience Physics

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Faktor–Faktor Penentu Keberhasilan Pelepasliaran Orangutan Sumatera (Pongo Abelii) di Taman Nasional Bukit Tigapuluh Yanto Santosa; Julius Paolo Siregar; Dones Rinaldi; Dede Aulia Rahman
Jurnal Ilmu Pertanian Indonesia Vol. 17 No. 3 (2012): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (338.026 KB)

Abstract

Study on determinant factors on success of Sumatran orangutan reintroduction was done to all orangutans in reintroduction station (84 individual + 1 infant orangutan). This study was conducted from August to December 2006 in the Station of Orangutan Reintroduction Centre located in Buffer Zone of Bukit Tiga Puluh National Park. The purpose of this study was to measure the effects of determining factors to the success of orangutans reintroduction to their natural habitat and to identify other factors that give impact to the reintroduction success. Data were collected through direct observation of activities and daily behavior of orangutans using scan sampling and continuous recording methods as well as through interviews with officials. Data analysis was performed descriptively and quantitatively using statistical tests (chi–square) with 95% confidence interval. The results showed that there is a match between percentage of success of the reintroduction of the six criteria of reintroduction success. The results of chi–square indicates that determinant factors, such as age class, orangutan life history, treatment and duration of reintroduction stage, are correlated to the success of reintroduction activities.
Activity Budget of Ex-captive Sumatran Orangutan Post Release in Sumatran Orangutan Reintroduction Centre in Jambi Julius Paolo Siregar; Ani Mardiastuti; Rondang Sumurung Edonita Siregar
Media Konservasi Vol 23 No 1 (2018): Media Konservasi Vol. 23 No. 1 April 2018
Publisher : Department of Forest Resources Conservation and Ecotourism - IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (766.823 KB) | DOI: 10.29244/medkon.23.1.99-106

Abstract

Excaptive orangutans were not have a proportional activity budget for their suitable food, so that many individuals have been failed to adapt.Assessment daily activity budget should to have for excaptive orangutans to determine successful adaptation to independent life. Our reserachconducted on 13 individuals who were divided into two groups according to behavioral characteristic were seven individuals tame and six individualssemiwild. We recorded their activities for 9-10 days (7.290–8.100 minutes) after their released via instantaneous sampling method with a sampleinterval for 2 minutes. The results showed that group of semiwild spent duration on feeding (43%) higher than tame (28%), whereas tame spent onresting (55%) higher than semiwild (38%). Results of analysis on daily activities of two groups showed significant differences in resting, feeding andother activities among the two groups (n1=70; n2=56) have probability value of Mann Whitney Test resting: p=0,000<0,05; feeding:p=0,000<0,05; other activities: p=0,009<0,05. Only moving activity showed no significant difference results (n1= 70, n2=56; p=0,507>0,05).Semiwild group has activity budget similar to wild orangutans in natural habitat.Keywords: activity budget, ex-captive, sumatran orangutan 
Structure, Composition, Carbon Stocks of Dipterocarpaceae in West Batang Toru Forest Block, North Tapanuli Regency, North Sumatra Pratiwi, Suci; Pasaribu, Nursahara; Julius Paolo Siregar
Journal of Sylva Indonesiana Vol. 7 No. 01 (2024): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v7i01.11263

Abstract

The West Batang Toru Forest Block in the North Tapanuli Regency, North Sumatra, is one of the lowland forests in Sumatra with a variety of plant communities and populations that have not been fully documented. This area is considered a potential high-value carbon reserve of ecological significance. The purpose of the study was to determine the structure and composition of the Dipterocarpaceae at the West Batang Toru Forest Block. This research was conducted from September 2021 to March 2022. The research location was determined by using the purposive sampling method with a transect length of 300 m. Each lane had plots of 20 × 20 m measured in a zigzag position and had an interval of 10 meters. The number of plots in each lane was 10, for a total of 90 plots. Based on the observations, there were nine species of Dipterocarpaceae obtained from a total of 621 individuals. The basal area ranged from 578.02 cm2/Ha to 397,894.43 cm2/Ha, and the largest basal area was at the tree level. The vegetation composition ranged from 60% to 66%, and the highest composition was at tree level. Sixty-two trees were classified as having the largest basal area, followed by poles (42 individuals) and saplings (64 individuals). Shorea platyclados occurred consistently with a compositional percentage value at the tree level with a value of 66%, the pole level of 53%, the sapling rate of 34%, and the seedling level of 9%. The carbon stocks from Dipterocarpaceae stands were 91534 tons/ha, which is the first estimate of their ecological importance
Vegetation composition and carbon stocks in West Batang Toru Forest Block, North Sumatra PASARIBU, NURSAHARA; RANGKUTI, LATIFAH HANNUM; SIREGAR, JULIUS PAOLO
Jurnal Natural Volume 24 Number 3, October 2024
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v24i3.30908

Abstract

West Batang Toru Forest Block, North Tapanuli Regency, North Sumatra Province is a forest that contains numerous species of tree stands and is estimated to be able to store a considerable high carbon from the atmosphere. The aim of this study was to determine the composition of vegetation and the potential for carbon stored in the forest region. This research was conducted from September 2021 to March 2022 using a purposive sampling method. Vegetation data were analyzed using the Diversity Index (H'), Uniformity Index (E) using the Shannon-Wiener equation. The carbon stock of each stand per species was estimated using the Ketterings allometric equation. The study documented a total of 64 families, belonging to 297 species with a total of 2,399 individuals. The percentage of composition of all growth rates ranged from 31%-59%. The Importance Value Index (IVI) of all growth rates ranged between 14.3 to 71.7%. The highest diversity index and evenness index at the tree level were 4.71 and 0.85. The stored carbon is 373.227 tons C/ha in West Batang Toru Forest Block, highlighting the forest region as an important green carbon sink.
Co-Authors Ani Mardiastuti DEDE AULIA RAHMAN Dones Rinaldi Nursahara Pasaribu RANGKUTI, LATIFAH HANNUM Rondang Sumurung Edonita Siregar Suci Pratiwi YANTO SANTOSA