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All Journal AGROLOGIA : Jurnal Ilmu Budidaya Tanaman JURNAL BUDIDAYA PERTANIAN Science Nature
Osok, Rafael M
Fakultas Pertanian Universitas Pattimura Ambon
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Environmental Science

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Simpanan Karbon Di Atas Permukaan Pada Berbagai Penggunaan Lahan Di Hutan Lindung Sirimau, Pulau Ambon Sandhy H Luhulima; Rafael M Osok; Elizabeth Kaya
JURNAL BUDIDAYA PERTANIAN Vol 16 No 2 (2020): Jurnal Budidaya Pertanian
Publisher : Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/jbdp.2020.16.2.215

Abstract

Forest conversion is a main contributor to land cover changes in the Sirimau protected forest area in Ambon Island, which reduces forest’s ability to absorb carbon from the atmosphere. This study aimed to calculate above-ground carbon and potential carbon sequestration in Sirimau protected forest area. Sampling techniques were adapted from the method of Hairiah et al. (2001; 2011) and Wibowo et al. (2013), namely non-destructive (for tress) and destructive methods (for understorey). Data analysis included the calculation of biomass and above-ground carbon stocks (trees and understorey) of all land uses based on Hairiah et al. (2001; 2011). The results showed that total carbon stocks in the Sirimau protected forest was 418.98 ton per ha, consisted of tree carbon stocks, 402.25 ton per ha (96%) and understorey 16.69 ton per ha (4%), whereas the largest carbon stock was found in primary dry land forest of 187.59 ton per ha, secondary dryland forest of 100.48 ton per ha, shrubs of 32.59 ton per ha (7.78%), agriculture dry land 31.41 ton per ha (7.5%), mixed dry land and agriculture 59.25 ton per ha (14.14%), savanna 6.78 ton per ha (1.62%) and settlements 0.84 ton per ha (0.2%). The potential carbon sequestration in the Sirimau protected forest was 1,537.50 ton CO2 per ha, and the largest absorption was 1,476.25 ton CO2 per ha or 96% of the total absorbed CO2 by trees. The largest CO2 absorption capacity was 688,45 ton CO2 per ha (44.78%) by primary dryland forest. Keywords: trees and understorey carbon stocks, carbon sequestration, Sirimau protected-forest, Ambon Island ABSTRAK Konversi hutan merupakan penyebab perubahan tutupan lahan di kawasan hutan lindung Sirimau, Pulau Ambon, sehingga mempengaruhi fungsi hutan sebagai penyerap karbon dari atmosfer. Penelitian ini bertujuan untuk mengkaji simpanan dan potensi serapan karbon di atas permukaan pada hutan lindung Sirimau setelah terjadi perubahan penggunaan lahan sejak tahun 2010. Teknik pengambilan sampel diadaptasi dari metode Hairiah et al. (2001; 2011) dan Wibowo et al. (2013), yaitu non-destructive untuk pohon dan destructive untuk tumbuhan bawah. Analisis data meliputi perhitungan biomasa dan cadangan karbon di atas permukaan (pohon dan tumbuhan bawah) pada semua penggunaan lahan dengan mengacu pada Hairiah et al. (2001; 2011). Hasil penelitian menunjukkan bahwa total simpanan karbon pada hutan lindung Gunung Sirimau adalah 418,98 ton per ha, yang berasal dari cadangan karbon pohon, 402,25 ton per ha (96%), dan tumbuhan bawah 16,69 ton per ha (4%). Berdasarkan penggunaan lahan, cadangan karbon terbesar berasal dari penggunaan lahan hutan lahan kering primer sebesar 187,59 ton per ha, hutan lahan kering sekunder 100,48 ton per ha, semak belukar 32,59 ton per ha (7,78 %), pertanian lahan kering 31,41 ton per ha (7,5%), pertanian lahan kering campuran 59,25 ton per ha (14,14%), savana 6,78 ton per ha (1,62%) dan permukiman 0,84 ton per ha (0,2%). Potensi serapan karbon dioksida oleh vegetasi pada hutan lindung Gunung Sirimau sebesar 1.537,50 ton CO2 per ha. Penyerapan terbesar berasal dari vegetasi tingkat pohon sebesar 1.476,25 ton CO2 per ha atau 96 % dari total penyerapan CO2. Berdasarkan penggunaan lahannya, hutan lahan kering primer memiliki kemampuan penyerapan CO2 terbesar yaitu 688,45 ton CO2 per ha atau 44,78% dari total serapan CO2. Kata kunci: cadangan karbon pohon dan tumbuhan bawah, serapan karbon, hutan lindung Sirimau, Pulau Ambon
Penilaian Degradasi Lahan dan Dampak Sedimentasi terhadap Perencanaan Bangungan Air di Daerah Aliran Sungai Wai Ruhu, Kota Ambon Calvin T Tutuarima; Silwanus M Talakua; Rafael M Osok
JURNAL BUDIDAYA PERTANIAN Vol 17 No 1 (2021): Jurnal Budidaya Pertanian
Publisher : Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/jbdp.2021.17.1.43

Abstract

Land degradation is the reduction in the ability of land to generate benefits from certain land uses under special treatment from land management. Land degradation usually indicates deterioration in the production capacity of the land either temporarily or permanently. A further consequence of the land degradation process is the emergence of unproductive areas called critical lands. Quantitative and qualitative determination of erosion in a watershed area could be identified through observation of real damage indicators that had occurred in the field. This is based on this study results combined with the method of determining soil degradation in the field, namely the Field Assessment Tools, indicators of soil damage due to erosion obtained in the area of this this study area. These included pedestals, exposed plant roots / tree roots and exposed building foundations as an indication of land degradation due to sheet erosion, channel indicators as channel erosion and trench indicators as trench erosion. The classification of land degradation due to erosion found in the Wai Ruhu watershed showed that the level of land degradation could be classified as light erosion, moderate erosion, heavy erosion and very heavy erosion, with the range of erosion varying from 4.40 tons/ha/year to 675,62 tons/ha/year. Meanwhile, from the results of direct measurements, the overall average sediment concentration was 98,06 mg/L. During the rainy season, the average sediment concentration produced was 107,43 mg/L, higher than during the dry season of 88.69 mg/L. The Wai Ruhu watershed had a fairly large discharge. Although during the dry season the river was not dry completely, the discharge was very small. The basic material found along the Wai Ruhu watershed indicated that there had been intensive degradation processes in the upstream area. Excessive deposition along the river would result in reduced capacity of the river channel. Keywords: Ambon, discharge, land degradation, sedimentation, Wai Ruhu Watershed ABSTRAK Degradasi lahan adalah berkurangnya kemampuan lahan untuk menghasilkan manfaat dan keuntungan dari penggunaan lahan tertentu di bawah perlakuan khusus dari pengelolaan lahan kerusakan lahan biasanya menandakan kemunduran kapasitas produksi dari lahan baik secara temporer maupun secara permanen. Akibat lanjut dari proses degradasi lahan adalah timbulnya areal-areal yang tidak produktif yang disebut lahan kritis. Penentuan besar erosi secara kuantitatif dan kualitatif pada suatu wilayah DAS dapat diidentifikasi melalui pengamatan terhadap indikator-indikator kerusakan yang nyata terjadi di lapangan. Berdasarkan hasil penelitian yang telah dilakukan ini, yang dipadukan dengan metode penentuan degradasi tanah di lapangan berupa Field Assessment Tools, maka indikator-indikator kerusakan tanah akibat erosi yang didapatkan di daerah penelitian. Itu terdiri dari pedestal, akar tanaman/akar pohon terekspos dan fondasi bangunan terekspos sebagai indikasi degradasi lahan akibat erosi lembar, indikator alur sebagai erosi alur dan indikator parit sebagai erosi parit. Klasifikasi degradasi lahan akibat erosi yang ditemukan di DAS Wai Ruhu menunjukkan bahwa tingkat degradasi lahan tergolong erosi ringan, erosi sedang, erosi berat dan erosi sangat berat, dengan kisaran besar erosi yang bervariasi antara 4,40 ton/ha/tahun sampai 675,62 ton/ha/tahun. Sedangkan dari hasil pengukuran langsung secara keseluruhan konsentrasi sedimen rata-rata adalah sebesar 98,06 mg/L. Untuk saat hujan konsentrasi sedimen rata-rata yang dihasilkan adalah sebesar 107,43 mg/L, lebih tinggi daripada saat kemarau sebesar 88,69 mg/L. DAS Wai Ruhu mempunyai debit yang cukup besar. Meskipun pada saat kemarau aliran sungai tidak kering sama sekali, tetapi debitnya sangat kecil. Material dasar yang terdapat di sepanjang saluran DAS Wai Ruhu menggambarkan bahwa telah terjadi proses-proses degradasi yang intensif di daerah hulu. Pengendapan yang berlebih di sepanjang sungai akan akan mengakibatkan berkurangnya kapasitas saluran sungai. Kata kunci: Ambon, DAS Wai Ruhu, debit air, degradasi lahan, sedimentasi
Penetapan Kelas Kemampuan Lahan Dan Arahan Rehabilitasi Lahan Das Wai Batu Merah Kota Ambon Provinsi Maluku Rafael M Osok; Silwanus M Talakua; Dhanang Supriadi
Agrologia Vol 7, No 1 (2018): Agrologia: Jurnal Ilmu Budidaya Tanaman
Publisher : Faculty of Agriculture, Pattimura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/a.v7i1.355

Abstract

Land use planning requires a proper consideration, so that the function of land can take place continuously and sustainably. The objectives of the research were to establish the land capability class of Wai Batu Merah watershed its land use management in accordance with each land capability class. The research method was survey with synthetic and analytical approaches, and  flexible observation distance following physiographic change, soil type and land use within landunits. The results of the study showed that Wai Batu Merah watershed has 6 class and 12 sub-class land capability of II.B,KE3,e1, III.e2,  III.C, IV.b2, IV.D,b2, IV.D, VI.e4, VI.E, VII.e5, VII.F,e5, VII.F, and VIII.t5 with limiting factors of  slope steepness, erosion sensitivity, percentage of gravel and rock, and soil texture. Land use management planning  in the Wai Batu Merah watershed includes intensive, medium, and limited agriculture, intermediate and limited grazing, agroforestry, protection forest, forest, home garden, biopores and organic materials.Keywords: Land Capability Class, Wai Batu Merah Watershed
Analysis of Physical Characteristics and Soil Degradation Due to Erosion and Rehabilitation Recommendation Based on GIS in Protected Forest Area of Mount Sirimau Carla E Tupanno; Silwanus Talakua; Rudy Soplanit; Rafael M Osok
JURNAL BUDIDAYA PERTANIAN Vol 19 No 1 (2023): Jurnal Budidaya Pertanian
Publisher : Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/jbdp.2023.19.1.58

Abstract

Forest areas are designated as protected forests if they function as a provider of clean water reserves, erosion control, city lungs or other functions. Disruption of forest land resources has an impact on changes in the physical properties of the soil and soil degradation due to erosion. Objectives of this study were: 1) to examine the relationship between soil physical properties, 2) to determine soil degradation due to erosion, 3) to examine the relationship between soil physical properties and the level of soil degradation due to erosion, 4) to determine recommendations for land rehabilitation. Research observations were made based on 15 sample areas representing 212 land units. All analyzes were carried out based on Geographic Information Systems (GIS). The physical properties of the soil studied included texture, structure, pore distribution, permeability, particle density and oven dry mass density; whereas soil degradation analysis was based on RUSLE: A=RKLSCP (Renard et al., 1997), and correction of the erosion model A=0.2547RKLSCP (Talakua S.M. and Osok, 2017. The rehabilitation recommendations analyzed were erosion tolerance, potential erosion and CP-maximum. Study results were: 1) The correlation between physical properties was significant (P-value = 0.000*-0.018*) with a positive correlation coefficient (0.163-0.999) and negative one (0.199-0.998); 2) The average erosion rate was: light 3.60 t/ha/year (1425.20 ha), moderate 32.03 t/ha/year (410.28 ha), heavy 108.95 t/ha/year (946 .2 ha), very heavy 426.83 t/ha/year (457.44 ha); 3) There was a significant correlation between the physical properties of the soil and the amount of erosion with a P-value = 0.000*–0.029* with a positive (0.152-0.161) and a negative (0.150-0.151) correlations; 4) Recommendation for rehabilitation are agroforestry patterns combined with tillage and planting of plants according to contour lines on slopes of 0–8%, planting grass in strips, planting low ground cover on high density plantation crops and maintaining secondary and primary forests.
Evaluasi Kesesuaian Lahan Berbasis SIG Untuk Tanaman Cengkih, Pisang, dan Ubi Kayu di DAS Wai Ela, Negeri Lima, Pulau Ambon Gresi Hatulely; J P Haumahu; Rafael M Osok; Silwanus Talakua
JURNAL BUDIDAYA PERTANIAN Vol 17 No 2 (2021): Jurnal Budidaya Pertanian
Publisher : Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/jbdp/2021.17.2.128

Abstract

The characteristics and quality of land resources are important things that must be considered in the planning, utilization and management of land for agricultural purposes. The purposes of this research were to describe land characteristics and quality, and to determine the suitability class, subclass, and limiting factors for clove (Zysygium armoticum), banana (Musa sp), and cassava ( Manihot esculenta Crant.) crops in Wai Ela Watershed. The method used in this study was a survey with land units as a fieldwork map which resulted from overlying four components, namely slope class, lithology formation, soil, and land uses. Field data collection was conducted following the observation lanes at 15 selected sample areas representing 72 land units. Data analysis was carried out by using a geographic information system (GIS), involving: (1) SRTM image analysis to produce topography class, (2) maps overlay to produce land units, and (3) attribute data processing to produce land suitability class. The study results showed that the land suitability for clove consisted of the suitable class of S2 (21.91 ha) and S3 (327.89 ha), and not-suitable, N (1069.85ha), with limiting factors being flooding, soil depth, and slope steepness. Land suitability for bananas consisted of the suitable class of S3 (501.70 ha), and not-suitable, N (686.99 ha) with limiting factors being flooding, erosion, and slope steepness; whereas land suitability for cassava consisted of the suitable class of S3 (501.70 ha) and not-suitable, N (917.96 ha), with limiting factors being flooding, slope steepness, and erosion.
Co-Authors A.M. Kalay Alfredo Manusama Calvin T Tutuarima Carla E Tupanno Daniel Torimtubun Dhanang Supriadi Dhanang Supriadi Elizabeth Kaya Ellisa J Gaspersz Ellisa J Gaspersz Gresi Hatulely Hendrico F Hehakaya Hetti May Rini Pintu Batu J P Haumahu Pieter J Kunu Reginawanti Hindersah Rudy Soplanit Sandhy H Luhulima Silwanus M Talakua Silwanus M Talakua Silwanus M Talakua Silwanus M Talakua Silwanus M Talakua Silwanus M. Talakua Silwanus M. Talakua Silwanus Talakua Silwanus Talakua Silwanus Talakua Siregar, Adelina Sisilia Wariunsora Willem A Siahaya