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Sofyan Husein Siregar
Universitas Riau
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Energy Environmental Science Immunology & microbiology Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Physics Social Sciences Other

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ANALISIS KEPADATAN BULU BABI DIADEMA SETOSUM PADA KONDISI TERUMBU KARANG BERBEDA DI DESA MAPUR KEPULAUAN RIAU Thamrin Thamrin; Yudha Januarizki Setiawan; Sofyan Husein Siregar
Jurnal Ilmu Lingkungan Vol 5, No 1 (2011): Jurnal Ilmu Lingkungan
Publisher : Program Pascasarjana Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jil.5.1.p.45-53

Abstract

Observation was conducted to analyze the different density of Diadema setosum urchin in theseveral condition of coral reef in Mapur Island of Riau Archipelago Province, from 16 until31 July 2010. The result showed that density of urchin increase by decreasing coral cover.Density of sea urchins Diadema setosum were found 8.8 ind/m2 in the highest percentagecoral cover, i.e. 84.62%, and followed by 22.46 ind/m2 urchin in 59.74 % coral cover, and32.06 ind/m2 urchin in the condition of coral cover 35.15%. The different results amongthree research station may be coused by available of D. setosum.
ANALISIS TINGKAT BAHAYA EROSI SUB DAERAH ALIRAN SUNGAI TAPUNG KANAN Sutrisna Sutrisna; Aras Mulyadi; Sofyan Husein Siregar
Jurnal Ilmu Lingkungan Vol 8, No 1 (2014): Jurnal Ilmu Lingkungan
Publisher : Program Pascasarjana Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jil.8.1.p.79-87

Abstract

The research on erosion level (TBE) in the sub watershed of Tapung kanan has beenconducted on February-March 2013 using the USLE (Universal Soil Loss Equation) bythe formula A = RxKxLSxC.P. The results showed that the change of use / land coverimpact on the actual increase in the level of erosion that occurs in each type of landuse. Erosion hazard level (TBE) which occurs in the sub watershed of Tapung Kanan,for each type of use / land cover has a magnitude which varies, with an average erosionrate of 130.18 tons / Ha / year, and the distribution for each class TBE is: very Low(SR): 16986.50 Ha (7.17)%; Low: 35343.73 ha (14.92%); Moderate: 142,155.01 ha(60.01%); high: 32109.48 Ha (13.55%) and very high: 10290.71 ha (4.34%). TSL valueof Tapung Kanan Sub watershed which obtained from this research ranged from 14.40-30.00 tons / ha / year, while the average value of the actual erosion of 130.14 tons / ha/ year, thus the Erosion hazard level of Tapung kanan Sub Watershed exceeds thepermitted threshold, the SDR value of 0.463, still below the SDR standard value of0.490.
STRUKTUR KOMUNITAS DIATOM EPILITIK PERAIRAN SUNGAI SENAPELAN DAN SUNGAI SAIL, KOTA PEKANBARU. Rizka Aprisanti; Aras Mulyadi; Sofyan Husein Siregar
Jurnal Ilmu Lingkungan Vol 7, No 2 (2013): Jurnal Ilmu Lingkungan
Publisher : Program Pascasarjana Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jil.7.2.p.241-252

Abstract

The aims of this research to assess the environmental condition of the Senapelan river and Sail river waters by the species abundance of epilithic diatom. This research identified 14 genera of epilithic diatom. The abundance of epilithic diatom at Senapelan river 48.779cell/cm2 and Sail river 15.564 cell/cm2. The value of diversity indices (H '), Senapelan river(2.936) and Sail river (2.336), the value of equability indices (E '), Senapelan river (0.691)and Sail river (0.550), and the dominant indices (C'), Senapelan river (0.187) and the Sailriver (0.336). Based on these indices Senapelan river and Sail river were included intomoderate polluted waters. Species that dominate Senapelan river and Sail river waters ofPekanbaru City are Navicula sp., Nitzchia sp, Fragilaria sp. and Melosira sp. 
KOMPOSISI DAN STRUKTUR PERMUDAAN POHON PIONIR BERDASARKAN JENIS TANAH DI KABUPATEN SIAK. Edmond Edwar; Rasoel Hamidy; Sofyan Husein Siregar
Jurnal Ilmu Lingkungan Vol 5, No 2 (2011): Jurnal Ilmu Lingkungan
Publisher : Program Pascasarjana Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jil.5.2.p.149-167

Abstract

The results showed that the soil type Latosol consist of 49 species, dominance of the highesttype for Forest Seedlings were Manggis Hutan (Garcinia parvifolia), saplings of Ludai(Sapium beccatum), poles of Mahang (Macaranga gigantea), tree of Sendok-Sendok(Endospermum javanicum). Soil type of Brown Forest Soil consist of 28 species, The highestdominance Seedlings type of Pulai Sudu (Kibatalia boornensis), saplings of Tempinis (Sloetiaelongata), pole of Terap (Artocarpus elasticus), tree of Mahang (Macaranga gigantea). Soiltypes of Organosol consist of 21 species, the highest level of dominance type seedlings KelatMerah (Sizygium cuminii), Kelat Putih (Sizygium subglauca), Kopi-Kopi (Randiaanisophylla), the saplings of Tenggek Burung (Evodia aromatica), the pole of TenggekBurung (Evodia aromatica), The tree of Mahang (Macaranga hypoleuca). The highestspecies dominance values index (1) at the level of tree on the soil type of Organosol andLatosol, while the lowest (0.0426) at the level of sapling on the soil type of Latosol. Thehighest of diversity value index (3.4837) at the level of saplings on the soil type of Latosol,while the lowest (0.0000) at the level of trees on the soil type of Organosol and Latosol. Thehighest of Similarity index (23.33) at the similarity between Brown Forest Soil and Latosol atthe level of saplings, while the lowest of similarity index (0.00) at the similarity betweenLatosol and Brown Forest Soil at the level of tree, Organosol and Latosol at the level ofpoles and tree, Brown Forest Soil and Organosol at the level of seedling, pole and tree.
STRATEGI PENGELOLAAN LAHAN GAMBUT EKS HGU BERBASIS MASYARAKAT DI KECAMATAN PUSAKO KABUPATEN SIAK Dudi Candra; Suwondo Suwondo; Sofyan Husein Siregar
Jurnal Ilmu Lingkungan Vol 14, No 2 (2020): Jurnal Ilmu Lingkungan
Publisher : Program Pascasarjana Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jil.14.2.p.129-141

Abstract

Central government authority which governing mastery, ownership, use and utilization of land and natural resources sectorally, authoritarian, and centralized in granting licenses for utilization of natural resources to business entities resulting in 3 (three) main problems, that are land tenure inequality, agrarian conflicts in natural resource management, and environmental damage. In 2018 in Riau Province, precisely in Siak Regency, Government implements land redistribution exconcession (HGU) of PT. Mahakarya Eka Guna (MEG) for community through the land objected of agrarian reform program (TORA) in order to rearrange the imbalance of mastery structure, ownership, use and utilization of land toward which more fair. So that land can be a source of livelihood and welfare for the community. TORA Program location is majority are in the function area of the peat swamp ecosystem Ministry of Environment and Forestry (KLHK) with peat depths of more than 3 meters, so the management of peatlands must follow government regulations related to regional function. The condition is currently being carried out land clearing on the exconcession land in TORA program to immediately utilization land, while the public does not have enough information and knowledge about the most profitable choice of plants.
EVALUASI PENERAPAN ASPEK EKOLOGI DALAM PENGELOLAAN HUTAN PRODUKSI LESTARI, PADA PT. PERAWANG SUKSES PERKASA INDUSTRI KABUPATEN KAMPAR RIAU Albahri Albahri; Aras Mulyadi; Sofyan Husein Siregar
Jurnal Ilmu Lingkungan Vol 10, No 1 (2016): Jurnal Ilmu Lingkungan
Publisher : Program Pascasarjana Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jil.10.1.p.1-14

Abstract

This study aims to determine how the application of the ecological aspects of the management unit PT. Perawang Sukses Perkasa Industri(PSPI)DistrictLipat Kain that have been certified sustainable plantation management.The research was conductedin Apriland May2014atthe PT. PSPI District Lipat Kain,Kampar, Riau. Application of 6 indicators of ecological aspects by PT. PSPI SFM that have been certified by the Director General of Forestry Enterprises P8 / VI-BPPHH / 2011, general has gone well with the 5 indicators include "good" and 1 indicator still includes "bad". The final value of the ecological aspects of the performance of the total value of all the indicators of the ecological aspects of performance by 93%. Based standards and guidelines for SFM assessment, because there are still a valuable indicator of poor, then the final conclusion of the ecological aspects of performance by PT.PSPI District Lipat Kain still "bad". The results showed that thematurity value oftheverifierin the category"good" in the ecological aspects of the standards and guidelines for SFM assessment the Director General of Forestry Enterprises P. 8/VI-BPPHH/2011, can not guarantee there alization of conservation of the forest environment.
Community Stucture of Epiphytic Diatoms on Seagrass Leaves of Enhalus acoroides in Jago-Jago Coastal Waters of Tapanuli Tengah North Sumatera Province Bornok Silalahi; Sofyan Husein Siregar; Zulkifli '
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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Abstract

This research was conducted in March 2015 in the coastal waters of the village of Jago-Jago Central Tapanuli, North Sumatra. The aim of this research was to know the community structure of epiphytic diatom which include the type and abundance, diversity, uniformity and epiphytic diatom dominance contained in the leaves of Enhalus acoroides and to know the characteristics of the diatom habitat includes water quality parameters that affect the existence of epiphytic diatoms. Data were obtained by direct observation, measurement and sampling in the field followed by the identification of the type (species) of epiphytic diatom at the Marine Biological Laboratory, University of Riau. The results showed Total epiphytic diatoms found were 30 genera. The highest abundance of diatoms were Nitzschia and Skeletonoma that were recorded in station III. This genus has high adaptability pitch on the environment so that it can grow and develop properly. Diatom abundance of epiphytes on the leave base, middle and tip of the station I ranged from 31.093 to 71.035 ind/cm2, in the station II ranged from 59.093 to 92.855 ind/cm2 and at stations III ranged from 33.562 to 82.460 ind/cm2. The highest abundance of epiphytic diatoms was found in station II, ie 75.013 ind/cm2, while the lowest abundance was found in station I, 48.935 ind/cm2. The value of diversity index (H '), dominance index (D) and uniformity index (E), concluded that quality was diversity of species were, no species dominated and water quality was still in favorable condition to support the life of epiphytic diatoms.Key Words: Community Structure, Epiphytic Diatoms, Enhalus acoroides, TapanuliTengah
COMPOSITION TYPE AND ABUNDANCE OF PHYTOPLANKTON IN TELUK BAYUR WATERS PADANG WEST SUMATRA Andi Darlianto; Aras Mulyadi; Sofyan Husein Siregar
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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Abstract

ABSTRACT                This research was conducted in March 2018 - April 2018 in Teluk Bayur, Padang Selatan Subdistrict, West Sumatra Province. The purpose of this research is to determine the type composition and abundance of phytoplankton in the waters of Teluk Bayur Padang, West Sumatra. Survey method was used in this research. Water quality measured in this research is temperature, pH, DO, Salinity, Nitrate, Phosphate, and Current speed. Phytoplankton composition in Teluk Bayur waters is composed by 5 class which is  Bacillariophyceae, Dinophyceae, Cynophyceae, Coscinodiscophyeae and Mediophyceae with total 16 species. The highest phytoplankton abundance in Teluk Bayur waters is found in stasiun 1 total 83,3 (ind/l) and the lowest abundance is in station 4 total 69,9 (ind/l). The highest relative abundance of phytoplankton species at station 1 is Leptocylindrus sp as much as 25%, at station 2 the highest is Streptotheca sp as much as 26%, at station 3 is Leptocylindrus sp and Surella sp as much as 16.3% and at station 4 namely Isthimia sp as much as 22.5%. Key word : Water quality, Phytoplankton, Teluk Bayur
RELATIONSHIP OF TOTAL SUSPENDED SOLID (TSS) WITH PHYTOPLANKTON ABUNDANCE IN PADANG STRAIT WATERS OF BENGKALIS REGENCY RIAU PROVINCE Ardian Dwi Pratama; Sofyan Husein Siregar; Mubarak Mubarak
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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Abstract

ABSTRACT             This research was conducted in March to April 2019. The purpose of this research was to find out value of total suspended solid (TSS) content,value of phytoplankton abundance, and the relationship between the total suspended solid (TSS) and the abundance of phytoplankton. This research used survey method, there is arefour sampling stations with three replications in each station. The results showed, that the highest average of TSS contentin Padang Strait waters was found in Station 3 (241,33 mg/l) and the lowest in Station 4 (193,33 mg/l). The types of phytoplankton was found in Padang Strait waters was 14 types, they areBacillaria sp, Closterium sp, Coscinodiscus sp, Isthmia sp, Rhizosolenia sp, Synedra sp, Navicula sp, Skeletonema sp, Thalassionema sp, Oscillatoria sp, Nitzschia sp, Hantzschia sp, Amphora sp, and Pleurosigma sp with the most dominant types are Isthmia sp and Rhizosolenia sp. The highest abundance was found in aroundMangrove Area of Pangkalan Jambi Village (3247,59 ind/l) and the lowest was found inSungai Selari Port (1538,18 ind/l).Based on simple linear regression, the relationship ofTSS content with phytoplankton abundance showed a intense negative relationship, it means that the increasing of TSS content will decreasing abundance of phytoplankton in Padang Strait waters. Keywords:Padang Strait, TSS, Abundance of Phytoplankton
RELATIONS WITH TOTAL CONTENT OF ORGANIC MATTER IN THE AREA MANGROVES ABUNDANCE OF PHYTOPLANKTON IN TANJUNG BALAI ASAHAN WATERS OF NORTH SUMATRA Joenathan Sarumpaet; Irvina Nurrachmi; Sofyan Husein Siregar
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 7, No 1 (2020): Edisi 1 Januari - Juni 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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Abstract

ABSTRACT The purpose of this study to determine the content of organic matter, knowing the abundance of phytoplankton in the waters of Tanjung Balai Asahan, and determine the relationship between total organic matter content of the abundance of phytoplankton in the waters of Tanjung Balai Asahan. This study was conducted in July - August 2019, The method used in this study is a survey method. Observation station determined by purposive sampling. Results of water quality measurements showed that the temperature of between 29.5 to 33 ° C, pH 6-7, 23-25 ppt salinity, brightness ranged from 24.25 to 49.8 cm, the average flow velocity ranges from 0.15 to 0, 48 m / sec, and a depth ranging from 2.7 to 6 m. The survey results revealed thattotal organic matter content ranged20.44 to 27.14 mg / l, Phytoplankton are found there are 6 genus of phytoplankton that is, Isthmia sp, Navicula sp, sp Pleurosigma, Skeletonema sp, Coscinodiscus sp, sp Triceratium, Average - Average abundance of phytoplankton ranged1930.19 -3603.03 ind / l, Total organic matter content relationships with an abundance of phytoplankton have a strong relationship with the coefficient (r) = 0.80, where the increase in total organic matter content of the abundance of phytoplankton will increase. Keywords: Phytoplankton, Total Organic Ingredients, Water Tanjung Balai 
Co-Authors ', Thamrin ', Zulkifli AA Sudharmawan, AA Achmad Mulyadi Adam Dionfriski Ade Riccard Simatupang Adriana, Alysa Adrizal, Taufik Afrizal Tanjung Albahri Albahri Alvin Natali Andi Darlianto Anisaldi Anisaldi Anita, Sofia Antoni Antoni Aras Mulyadi Ardhi Yusuf Ardian Dwi Pratama Ardiansyah Hamid Arief Mubyarso Aslim Rasyad Asmika Harnalin Simarmata Bahri S, Aswan Bahtiar Denny Edison Belilasari Belilasari Belilasari, Belilasari Beranda, Ongki Okto Bintal Amin Bornok Silalahi Chairun Nisa Chitra Hermawan Chitra Hermawan Dalimunthe, Salmi Patima Dellarosa, Wiranda Deni Efizon Desmarina, Y. Despela, Despela Dessy Yoswati Dessy Yoswaty Devid Joehari Dewi Marni Dinda Trie K Hayati Dinda Trie K Hayati Dionfriski, Adam Dodik Ridho Nurrochmat Dudi Candra Eddy Handoko Edmond Edwar Efriyeldi, Efriyeldi Elda Nazriati Elizal, Elizal Endah Julita Eva Desy Yulina Siregar, Eva Desy Yulina Fainal Asandi Fairuzia, Putri Marwah Farid Febrianda Fathiya Hanifa Fauzan, M. Febbyolla, Selfi Anidal Febrianda, Farid Fery, Rony andes Gendraya Rohaini Ginting, T.B. Hamid, Ardiansyah Hanif, Naufal Happy Rosalina Hapsoh Hapsoh Hapzi Ali Henny Daniaty I Gusti Wayan Murjana Yasa Imam Suprayogi Ira Putra, Ira Irvina Nurachmi Jamhari Jamhari Jasril Jasril Joenathan Sarumpaet Joko Samiaji Josua Simanjuntak, Josua Lazuardi, Andika Lucky Rahman Lydia S Marpaung M. Hambali M. Hambali Manda Putra, Ridwan Marpauang, EkoRinaldi Masykur HZ Masykur Hz Megawati Hari Dwi Jayanti Mery Mery Mia Audina Mia Audina, Mia Miduk Tampubolon Mila Rosa Miswadi Miswadi Mubarak Mubarak Mubarak Mubarak Muchlis Muchlis Muchlis Muchlis Mudinillah, Adam Mufidah, Marhamah Nurul Muhammad Saroha Lubis Muhammad, Andi Syahroni Mumin Rifai Musrifin Galib Nickson Panjaitan Nila Sari Lubis Nizar Rofiki Nova Esterlita Novi Permata Sari Noviawati Riza Nugraha, Rafiq Prima Nur Arifin Nur Arifin, Nur Nurhapida Nurhapida Nurliya ' Octavia Lorensa Br Sinaga Prasiska, Yulia Puspita, Sarah Putri Wahyuni Rahmita, R. Ramadhan, A.R Rasoel Hamidy Renata, Vivien Ridwan Manda Putra Rifardi Rinaldo, Rinaldo Rinaldo, Rinaldo Rini, Yulia Sapta Riski Hambali Risqiana Dani Riza Yuliani Rizka Aprisanti Rizka Aprisanti Rizki, A. Rosa, Mila Rulen, Betty Nia Rusadi, M Dio Eigmar S.Pd. M Kes I Ketut Sudiana . Said Nazman Arif Samsir Samsir Sari, D.J. Selfi Anidal Febbyolla Selvia, Seli Shofian Nanda Adiprayoga Silaban, Santi Maria Sinaga, Octavia Lorensa Br Sirait, Juliper Parasian Sitindoan, Benni Mario K. Sofia Anita Sujianto Sujianto Sujianto Sukendi Sukendi Susiyanti. N Sutami Sutami Sutrisna Sutrisna suwondo suwondo Syafruddin Nasution Syafrudin Nasution Syahril Nedi Taufik Herman Thamrin Thamrin Thamrin Thamrin Thamrin Thamrin Thamrin Thamrin Thamrin Thamrin Trinop Sagiarti TRINOP SAGIARTI, TRINOP Trisla Warningsih Vivien Renata Wahyudi Wahyudi Wahyuni, Weni Indah Windarti Windarti Wiranda Dellarosa Yanasari, Nurry Yanti, D.H. Yosua Afrianus P Yudha Januarizki Setiawan Yulia Prasiska Yuliani, Riza Yusni Ikhwan Siregar Zahtamal Zahtamal Zientika, Zientika Zukarnaini Zukarnaini Zulfan Saam Zulkifli ' Zulkifli Zulkifli