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All Journal Jurnal Hortikultura Indonesia (JHI) EUGENIA Buletin Palma Jurnal Ilmiah Sains AGRI-SOSIOEKONOMI Silvarum COCOS
JOHAN A. ROMBANG
Fak. Pertanian Unsrat
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Economics, Econometrics & Finance Environmental Science Mathematics Physics Social Sciences

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PENGARUH MEDIA TANAM TERHADAP PERTUMBUHAN SEMAI Aquilaria malaccensis Lamk. DI PERSEMAIAN Rinna Mamonto; Johan A. Rombang; Marthen Th. Lasut
COCOS Vol. 10 No. 3 (2018)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/cocos.v1i1.22201

Abstract

Abstract The increasing of market demand along with high selling price of agarwood encouraged people to get more production by cutting down the agarwood-producing trees. As a result, the population of gaharuproducing trees become decrease and needs to be conserved. Conservation efforts is collateral with production continuity to anticipating market demand can started from planting and cultivating. One of them is the provision of quality seeds that supported by good planting media. This research studied the effect of media on the growth of Aquilaria malaccensis Lamk.,seedlings while the planting media were soil, husk, and compost. The method was Completely Randomized Design method consisting of 6 treatments and 5 replications. Each replication consists of 1 plant, so there are 30 experimental units. Treatment is distinguished based on volume comparison of planting media, namelytreatment 1 (P1) soil, treatment 2 (P2) compost, treatment 3 (P3) husk, treatment 4 (P4) combination of soil:compost (50%: 50%), treatment 5 (P5) combination of soil: husk (50% - 50%), and treatment 6 (P6) combination of compost: husk (50%: 50%).The variables which observed were plant height, stem diameter and number of leaves. The results showed that the treatment of planting media using compost (P2) gave significant effect on the increase in height and number of leaves of Aquilaria malaccensis Lamk.,seedlings.  Key words : Aquilaria malaccensis Lamk., seedlings, soil, compost, husk
KAPASISTAS SALURAN SUNGAI KAROMBASAN Anggraini F. M. Pandeirot; Johan A. Rombang; Fabiola B. Saroinsong
COCOS Vol. 10 No. 3 (2018)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/cocos.v1i1.22659

Abstract

ABSTRACT Capacity Of Karombasan River Channels  The Karombasan watershed has an area of 270 ha and river length of 3.058 m. The main river, Karombasan River, floods almost every year, possibly because the river channel is not able to accommodate the volume of the flow and thus causing a number of houses on the riverbank to be flooded. This flooding event is very disturbing to the locals. The purpose of this research is to analyze the river in location that often flood. Sampling and observation points were determined through purposive sampling methods at the points of frequent flooding. River capacity was analyzed using the Manning equation. Analysis of current river capacity from points 1 to 5 is 10,82 m³/s, 7,85 m³/s, 12,19 m³/s, 11,03 m³/s, and 5,32 m³/s, respectively.  Keywords : Watershed, flood, river capacity.
ANALISIS KOEFISIEN ALIRAN PERMUKAAN PADA TIGA TIPE PENGGUNAAN LAHAN di TANAH ANDISOL Ikasapta Ramehiang; Johan Rombang
COCOS Vol. 10 No. 7 (2018)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/cocos.v1i5.25740

Abstract

ABSTRACT Current changes in land use caused by population growth and development in the development sector are increasing. This has a significant impact on changes in surface flow values, causing the flow coefficient to increase resulting in flooding. One of the important concepts in efforts to control flooding is the surface flow coefficient or commonly represented by C. This number of surface flow coefficients is one indicator to determine whether a watershed has been disturbed (physically). This study aims to calculate the Surface Flow Coefficient (C) in the type of forest land use, shrub land and open land. The method in this study used a randomized block design as a data collection method which was then analyzed using analysis of variants. From the results of measurements carried out in the field, the coefficient of surface runoff of forest land and shrub land is significantly different from open land where in forest land is 0.0019 and shrub land has a value of 0.0013, while open land is 0.0036. From the results of measurements carried out in the field, the infiltration rate in a row is shrub land of 210 mm / hour, forest land of 99 mm / hour and open land of 69.6 mm / hour. Forest land has a smaller infiltration rate compared to shrub land because forest land in the study area is artificial forest planted with vegetation, strata and has a different root system of natural forest. Keywords: surface flow coefficient, infiltration, surface flow
PERANAN PENGGUNAAN LAHAN DI AREA TANGKAPAN SUNGAI TATAARAN TERHADAP EUTROFIKASI DANAU TONDANO Claudio Bonifasius; Johan Rombang Johan Rombang; Josephus Kalangi Josephus Kalangi
COCOS Vol. 12 No. 3 (2020): EDISI JULI-SEPTEMBER 2020
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/cocos.v7i7.31141

Abstract

ABSTRACTEutrophication is a problem faced by the world today. eutrophication is causedby increasing nutrient concentrations that occur in freshwater ecosystems. Land usechange in this case greatly affects the freshwater ecosystem around the lake. Thisstudy aims to assess the levels of Nitrogen (N) and Phosphorus (P) in the Tataaranriver water flowing into Lake Tondano due land use in the Tataaran river catchmentarea. The method used in this research is survey method and determination ofsampling points based on purposive sampling or the determination according to theresearch objectives, in this case at the outlet of each land use which is then presenteddescriptively for comparison. The results of this study indicate that based on the studyof Nitrogen (N) and Phosphorus (P) levels in the Tataaran river water flowing into LakeTondano, the largest contribution transported comes from residential land use, namelythe average N value content is 56.86 mg / seconds and P of 217.64 mg / second.Keywords : Eutrophication, Landuse, River of Tataaran
ERODIBILITAS TANAH PADA KAWASAN HUTAN LINDUNG GUNUNG MASARANG Ayu Natia H. Djufri; Johan A. Rombang; Johny S. Tasirin
COCOS Vol. 13 No. 3 (2021): EDISI JULI-SEPTEMBER 2021
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/cocos.v4i4.34506

Abstract

Abstract This research aims to assess the value of soil erodibility in the Mount Masarang Protected Forest area Rurukan Village, Tomohon City. The research was conducted on 3 types of land cover, namely grasses/reeds land, agricultural land and secondary forests. For each type of land cover, 3 soil samples were taken. Soil sample points were determined purposively, the soil structure was observed and the soil permeability was measured using a permeameter with the constant water level method (Constant Head). Soil samples were analyzed in the laboratory to obtain data on soil texture and soil organic matter content, then K value was calculated according to the USLE method. The results showed that the highest soil erodibility was on agricultural land at 0.37 ton.jam.ft-tonf-1 .in-1 which is classified as a rather high class, while the lowest was on grass/reed land of 0.19 ton.jam.ft-tonf-1 .in-1 belongs to the low erodibility class. Factors causing high soil erodibility on agricultural land were a low clay content, higher silt and lower organic matter so that the soil is more easily eroded.Keywords: soil erodibility, protected forest, Mount Masarang.
FLUKTUASI SUHU UDARA PADA EKOSISTEM HUTAN KOTA Nonong Krisnawati Loha; Johan A. Rombang; Josephus I. Kalangi
COCOS Vol. 14 No. 3 (2022): EDISI JULI-SEPTEMBER 2022
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/cocos.v8i8.37237

Abstract

Abstract This study aims to determine fluctuations in air temperature in urban forest ecosystems. This research was carried out in 3 (three) places, namely Tomohon urban forest (921 meter above sea level), Bitung urban forest (Danowudu 248 meter above sea level) North Minahasa urban forest (Kenangan 342 meter above sea level), conducted in November 2021, for 5 days. Observation plots measuring 25x25 m at each location. The diameter of the crown was measured using the "Improvised technique". The results showed that, Danowudu urban forest had a tree density level of 0.0192 trees/m² with a diversity of 6 tree species, Tomohon urban forest had a tree density of 0.0224 trees/m² with a diversity of 3 tree species, and Kenangan urban forest had a tree density of 0.0272 trees/m² with a diversity of 5 tree species, the highest temperature fluctuation was obtained in the Kenangan urban forest at 7.48°C and the lowest at 5.08°C in the Tomohon urban forest. Keywords: Air temperature, fluctuation, urban forest
Distribusi Hujan Pada Pohon Nantu (Palaquium Sp.), Pala (Myristica fragrans), Cengkeh (Syzygium aromaticum) di Desa Warembungan, Kab. Minahasa Sapan, Hagi; Rombang, Johan; Kalangi, Josephus
Silvarum Vol. 3 No. 2 (2024): Silvarum
Publisher : Fakultas Pertanian, Universits Sam Ratulangi, Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/sil.v3i2.49759

Abstract

Interception is the process when rainwater falls on the surface of the vegetation above the ground, is held for a while, and is then evaporated back into the atmosphere or absorbed by the vegetation. There are two types of components that make up rainwater intercept by plants, namely stem flow and throughfall. This study aims to measure the value of rain intercept, canopy escape, and stem flow of nantu, nutmeg, and clove trees in the plantation area of ​​Waremungan Village, Kec. Pineleng, Kab. Minahasa. The method used in this research is quantitative comparative by comparing the differences in the observations. The study used 3 (three) species, namely nantu, nutmeg, and clove trees with each repeated 5 (five) times so that 15 (fifteen) experimental units were obtained with an observation period of 10 (ten) times then processed using t-value analysis. The results showed that the distribution of rainfall in terms of intercept, stem flow, and crown escape on clove, nutmeg, and nantu trees was not significantly different.
Identifikasi Medan Banjir di Bentang Alam Binerean, Kabupaten Bolaang Mongondow Selatan, Provinsi Sulawesi Selatan Ragentu, Deris Wijayanti; Rombang, Johan A.; Sumakud, Maria Y.M.A.
Silvarum Vol. 4 No. 1 (2025): Silvarum
Publisher : Fakultas Pertanian, Universits Sam Ratulangi, Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/sil.v4i1.58055

Abstract

Kejadian banjir disebabkan terutama oleh limpasan air permukaan yang jauh melebihi kemampuan tanah untuk menyerap air yang datang. Kelebihan air ini diakibatkan oleh curah hujan yang tinggi, berkurangnya daya serap lahan, dan kiriman banjir bandang. Wilayah Kabupaten Bolaang Mongondow Selatan mempunyai beberapa sungai yang ada pada kecamatan Pinolosian Tengah yaitu sungai Mataindo dan Minangan Mopopungu. Kejadian banjir hampir setiap tahun terjadi pada sungai yang ada di Pinolosian Tengah. Kejadian banjir yang sering terjadi tentunya meresahkan masyarakat. Bentang alam Binerean memiliki kondisi tutupan lahan hutan sekunder terbesar dengan persentase 32%. Kondisi kemiringan lereng di wilayah ini memiliki persentase terbesar datar 28%. Setiap bulan berpeluang terjadi banjir di Desa Mataindo dan Mataindo Utara. Faktor-faktor penyebab banjir meliputi kondisi topografi yang miring, curah hujan tinggi, serta jenis tutupan lahan seperti sawah, semak, hutan, kebun, pertanian lahan kering, dan pemukiman. Kejadian banjir di Mataindo dan Mataindo Utara terjadi pada rata-rata curah hujan lebih dari 76 mm. Hasil pemetaan daerah rawan banjir menunjukkan bahwa setiap bulan daerah bentang alam Binerean terjadi banjir pada Desa Mataindo dan Mataindo Utara dengan curah hujan tertinggi yang terdapat pada bulan Juli dan Agustus. Penyebab banjir juga disebabkan luapan air dari Sungai Minanga Mopopungu dan Sungai Mataindo yang ada di daerah tersebut. Kata kunci: Daerah Rawan Banjir, Curah Hujan, Tutupan Lahan
Perbandingan Beberapa Sifat Fisik Tanah di Hutan Lindung Gunung Mahawu dan Hutan Lindung Gunung Masarang Makarawung, Jerry; Rombang, Johan A.; Tasirin, Johny S.
Silvarum Vol. 2 No. 2 (2023): Silvarum
Publisher : Fakultas Pertanian, Universits Sam Ratulangi, Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/sil.v2i2.43550

Abstract

Sebagai bagian dari ekosistem, tanah merupakan kumpulan dari benda alam di permukaan bumi yang tersusun dalam horison-horison, terdiri dari campuran bahan mineral, bahan organik, air dan udara. Penelitian ini bertujuan untuk membandingkan beberapa sifat fisik tanah; bulk density, tekstur, infiltrasi, permeabilitas, dan porositas di hutan lindung Gunung Mahawu dan Gunung Masarang. Penentuan titik sampel dilakukan secara random melalui cluster sampling. Ada 3 titik sampel di masing-masing lereng bawah, tengah dan atas, di setiap titik diambil 3 sampel. Total ada 18 sampel di 2 lokasi penelitian. Pengukuran infiltrasi dan permeabilitas tanah dilakukan di lapangan, pengukuran porositas, bulk density dan tekstur tanah di laboratorium. Analisis data menggunakan paired sample t-test dengan aplikasi SPSS. Hasil penelitian menunjukkan bahwa tekstur tanah lereng bawah dan tengah Gunung Mahawu dan Gunung Masarang memiliki tekstur tanah lempung. Lereng atas Gunung Mahawu memiliki tekstur lempung berliat sedangkan Gunung Masarang bertekstur lempung. Laju infiltrasi berbeda nyata (α=5%) dimana Gunung Mahawu tergolong agak cepat di lereng bawah, sangat cepat di lereng tengah dan atas. Infiltrasi di semua lereng Gunung Masarang tergolong agak cepat. Permeabilitas lereng bawah Gunung Mahawu dan Gunung Masarang sangat lambat, lereng tengah dan atas tergolong lambat. Bulk density di semua lereng di kedua lokasi <1,0 g/cm3. Tanah sangat porous di dua lokasi penelitian.
Pemetaan Jalur Interpretasi Ekowisata Desa Tinongko dan Desa Buhias Taman Nasional Bunaken muriany, vinolya Prisilia; Langi, Martina A.; Rombang, Johan A.
Silvarum Vol. 3 No. 1 (2024): Silvarum
Publisher : Fakultas Pertanian, Universits Sam Ratulangi, Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/sil.v3i1.48731

Abstract

Penelitian ini bertujuan untuk membuat pemetaan jalur interpretasi ekowisata di Desa Tinongko dan Desa Buhias, Taman Nasional Bunaken. Metode yang digunakan dalam penelitian ini adalah metode eksplorasi pada lokasi yang telah disurvei. Analisis data yang digunakan yaitu metode deskripsi kualitatif dimana metode ini peneliti mendeskripsikan data hasil penelitian mengenai potensi wisata tentang keadaan dan kondisi objek ekowisata yang nantinya dibuat dalam bentuk tabel dan dilanjutkan dengan pembuatan peta jalur interpretasi ekowisata menggunakan aplikasi Arcgis 10.4. Hasil pemetaan jalur interpretasi ekowisata Desa Tinongko dan Desa Buhias dibuat mengelilingi kedua desa tersebut. Jalur interpretasi ekowisata ini memiliki jarak tempuh sepanjang 4,95 km. Titik awal pembuatan jalur dimulai dari Desa Tinongko yang nantinya akan melewati potensi wisata mangrove trail, hutan mangrove, titik pengamatan burung, pengamatan kupu-kupu, dan berakhir di mangrove trail Tinongko.
Co-Authors A. LUMINGKEWAS A. Thomas Abdul M. Muhammad Abdul M. Muhammad, Abdul M. Adenancy A. Montjai Adenancy A. Montjai, Adenancy A. Alfonsius Thomas Alfonsius Thomas Alfonsius Thomas Anggraini F. M. Pandeirot Anggreine H. Mentang Anggreine H. Mentang, Anggreine H. Antoneta Kartini Kotangon Astri Vandalia Elisabeth Naray Ayu Natia H. Djufri Belly Ireeuw Budi Utomo Mondolu Christomus Bode Christomus Bode, Christomus Claudio Bonifasius Etivera Safuf Etivera Safuf, Etivera Fabiola B. Saroinsong Fajar Gemilang Sahman Habdi Selpia Habdi Selpia, Habdi Hanny S. G. Kembuan Ikasapta Ramehiang J. I. KALANGI Jaelani ., Husain Johannes E. X. Rogi Josephus I. Kalangi Joshephus I. Kalangi KALANGI, J. I. Kalangi, Josephus Kotangon, Antoneta Kartini LUMINGKEWAS, A. Makarawung, Jerry Malsupri Taher Maria Y.M.A. Sumakud Marthen T. Lasut Marthen T. Lasut Marthen T. Lasut Marthen Th. Lasut Martina A. Langi Meity Rantung Mirna Umagapi Mirna Umagapi, Mirna muriany, vinolya Prisilia Nonong Krisnawati Loha Nurmawan, W. Pangemanan, Euis F. S. PASKALINA, YULIA Prayitno Prayitno Putra, Imam Syah R. Kainde Ragentu, Deris Wijayanti Ramli Sapsuha Reynold P. Kainde Reynold P. Kainde Rinna Mamonto ROGI, JOHANNES E.X. Rogi, Rino ., S. TUMBELAKA Sanger, Yorri Y. J. Santi . Lumingkewas Sapan, Hagi Sitti Wakiah Sukarman Sukarman Sumanto Basahona Sumanto Basahona Telah, Heinsy A.J. Timur Kogoya Timur Kogoya, Timur TUMBELAKA, S. Wakiah, Sitti Walangitan, H. D. Wowor, Andre E. Yorri Y. J. Sanger YULIA PASKALINA Yusran Ilyas Yusran Ilyas, Yusran Zulfitri Lawe