Iwan Hilwan
Silviculture Program, Faculty of Forestry, Bogor Agricultural University

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LAND REHABILITATION ON POST-FIRE AREA WITH DIFFERENT TYPES OF SOIL IN GUNUNG MAS REGENCY, CENTRAL KALIMANTAN Fathia, Arin Annisa; Hilwan, Iwan; Wibowo, Cahyo
Media Konservasi Vol 24 No 1 (2019): Media Konservasi Vol. 24 No. 1 April 2019
Publisher : Deparement of Forest Resources Conservation and Ecotourism - Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (402.503 KB) | DOI: 10.29244/medkon.24.1.20-28

Abstract

Forest and land fires can cause damage to forest ecosystems. Repeated fires cause the natural succession to be disrupted. Therefore, based on these problems, to improve the productivity of land after fires in Central Kalimantan, rehabilitation efforts needs to be done. This study aims to analyze the growth response of forestry plants in post-fire area with different soil types. This study consisted of six combinations of treatments namely controls (B0C1 and B0C2), treatment of dolomite, biochar, and compost (B1C1 and B1C2), and treatment of dolomite and NPK (B2C1 and B2C2) that planted randomized and rows Trees species were used in this research were Paraserianthes falcataria, Anthocephalus cadamba, Acacia mangium, and Campnosperma auriculata. Soil samples were also collected for analysis of soil physical and chemical properties on laboratory. This study showed that fertilization treatment significantly affected the increase of height and diameter of four trees species, while planting techniques (randomized and rows) did not significantly affected the increase of height and diameter of four trees species. Dolomite, biochar, and compost application significantly affected the increase of height and diameter of four trees species that planted randomized and rows (B1C1 and B1C2) in Podsol soil. Besides that, NPK and dolomite application significantly affected the increase of height and diameter of four trees species planted by randomized and rows (B2C1 and B2C2) in Acrisol soil. The fastest growth rate was A. mangium followed by P. falcataria, A. cadamba, and C. auriculata on Podsol and Acrisol soil. Based on the observations, P. falcataria, A. cadamba, A. mangium, and C. auriculata are recommended to be planted on both types of soil. Keywords: forestry plants, growth respon, Gunung Mas Regency, land rehabilitation, soil types
POLA PENYEBARAN DAN REGENERASI JENIS SANINTEN (CASTANOPSIS ARGENTEA BLUME) DI RESORT SELABINTANA, TAMAN NASIONAL GUNUNG GEDE PANGRANGO DISTRIBUTION PATTERN AND REGENERATION OF SANINTEN (CASTANOPSIS ARGANTEA BLUME) IN SELABINTANA RESORT, GUNUNG GEDE Hilwan, Iwan; Irfani, Ewi
Jurnal Silvikultur Tropika Vol. 9 No. 1 (2018): Jurnal Silvikultur Tropika
Publisher : Departemen Silvikultur, Fakultas Kehutanan, Institut Pertanian Bogor (IPB)

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Abstract

Saninten (Castanopsis argantea Blume) known as one of Indonesian indigenous tree species that has high value. Saninten found at Gunung Gede Pangrango National Park especially Resort Selabintana. Saninten produce fruits that can be consumed and wood that can be used as building materials. Regarding these facts, this tree species needs to be cultivated. The distribution pattern of saninten is needed for the right development, but the study about ecology andnatural population of this species is rare and less known. The aim of this research was to asses potential, regeneration and the distribution pattern of saninten. The research used a combination of lanes and line method with counturs cutting. The result showed that distribution of saninten in both location is clumped. Morishita index in lower attitude was 1.68 and in upper attitude was 1.29.Key words: C. argentea, distribution, Resort Selabintana, Taman Nasional Gunung Gede Pangrango
GROWTH RESPOND OF THREE TREE SPECIES ON TAILING OF QUARTZ SAND, MINED IN EAST BELITUNG REGENCY RESPON PERTUMBUHAN TIGA JENIS TANAMAN PADA MEDIA TAILING BEKAS PENAMBANGAN PASIR KUARSA DI KABUPATEN BELITUNG TIMUR Hilwan, Iwan
Jurnal Silvikultur Tropika Vol. 6 No. 2 (2015): Jurnal Silvikultur Tropika
Publisher : Departemen Silvikultur, Fakultas Kehutanan, Institut Pertanian Bogor (IPB)

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Abstract

Quartz sand is the main component of soil in heath forest floor which is very fragile in respond to any disturbance. The damaged heath forest after quartz sand has been mined, was very difficult to restore. Therefore, study on biophysical characteristics of primary and secondary heath forest are very important for improving forest rehabilitation efforts. After that, identification of tree species which is most suitable for the site in the rehabilitation program is very urgent. The research results showed that white jabon (Anthocephalus cadamba (Roxb.) Miq.) exhibited the greatest increase in height , diameter and dry weight (biomass). Therefore, white jabon is the best choice for rehabilitation on tailing of former quartz mined area. Planting media which are composed of tailing and organic matter (compost) is the best media for tree growth in rehabilitation program. The research results can serve as one of the guidances for stakeholders to manage heath forest in East Belitung Regency and as reference for rehabilitation activities.Key words: quartz sand, rehabilitation, tailing, white jabon
ANALYSIS OF CONSTRUCTED SWAMP FOREST VEGETATION AS A PHITOREMEDIATION AGENT IN COAL MINING, SOUTH KALIMANTAN Rahmatia, Citra; Hilwan, Iwan; Mansur, Irdika; Noor, Ihsan
Media Konservasi Vol 24 No 1 (2019): Media Konservasi Vol. 24 No. 1 April 2019
Publisher : Deparement of Forest Resources Conservation and Ecotourism - Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (492.339 KB) | DOI: 10.29244/medkon.24.1.29-39

Abstract

Coal mining activities could potentially interfere with the environment. One of the environmental disturbances in coal mining activities is theformation of acid mine drainage (AMD). AMD management can be done passively through the construction of swamp forest. The constructed swampforest system uses organic material in the form of cow manure which serves as a growing plants? medium. Phytoremediation is an attempt to usevplant species in the accumulation of heavy metals. This study was aimed to know the AMD management system passively and identify the diversity ofplants in artificial swamp forests. Purposive sampling method with a sample size of 2 x 2m in 10 plots/compartments was used to identify the plantdiversity in constructed swamp forest. The observation was made both before and after AMD flowed. Constructed swamp forest consist of 6compartments (2 sediment pond compartments and 4 swamp compartments). The results of the vegetation analysis found that before the AMD flowed,21 species are still capable growing naturally in constructed swamp forest, however, it became 15 after the AMD flowed. Cyperus iria, Fimbristylisgriffithii, Scirpus juncoides, Ludwigia hyssopifolia, Cyperus platystylis and Monochoria vaginalis are six dominant species that can be used asphytoremediation agent in constructed swamp forest.Keywords: Acid Mine Drainage, constructed swamp forest, phytoremediation
DIVERSITY AND ECOLOGICAL ROLE BRYOPHYTE IN SESAOT FOREST, LOMBOK, WEST NUSA TENGGARA Bawaihaty, Nuroh; ., Istomo; Hilwan, Iwan
Jurnal Silvikultur Tropika Vol. 5 No. 1 (2014): Jurnal Silvikultur Tropika
Publisher : Departemen Silvikultur, Fakultas Kehutanan, Institut Pertanian Bogor (IPB)

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Abstract

Diversity of mosses in Sesaot forest, Lombok, West Nusa Tenggara has 22 spesies, 12 family, and 3 classes. Diversity of mosses is the most common in the primary forest are 18 spesies, in fruit forest there are 12 spesies. And in the secondary forest are 7 species, there are 4 species contained in 3 areas, namely thuidium sp., barbella sp., calymperes sp., and lejeunea sp. Kind of mosses that mostly found is lejeunea sp., family is lejeuneaceae and classes is hepatice. And kind of mosses that lessly found is taxithelium sp., family is sematophyllaceae, and classes is music. Calyptotherium sp., family is entodontaceae, and classes is music. Plagiochila sp., family is lophoziaceae, and classes is music, and bazzania sp., family is lepidoziaceae, and classes hepatice. The condition of forest affect to the growth of mosses and its ecological roles in forest ecosystem. The mosses includes in pioneer plants, it is evidenced by many mosses that grow on fallen trees.
THE PHYSICAL AND CEHMICAL SOIL PROPERTIES ON HEATH FOREST AND EX-TIN MINED LAND IN EAST BELITUNG DISTRICT SIFAT FISIKA DAN KIMIA TANAH DI HUTAN KERANGAS DAN LAHAN PASCA TAMBANG TIMAH KABUPATEN BELITUNG TIMUR Oktavia, Dina; Setiadi, Yadi; Hilwan, Iwan
Jurnal Silvikultur Tropika Vol. 5 No. 3 (2014): Jurnal Silvikultur Tropika
Publisher : Departemen Silvikultur, Fakultas Kehutanan, Institut Pertanian Bogor (IPB)

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Abstract

The degradation of heath forest that caused by tin mining activity effected some environmental problems such as erotion, sedimentation and lose biodiversity. Restoration is become a way to recocover the ecosystem functions. Information about soil physical and chemical properties is needed for land restoration. Soil samples were collected by cluster sampling method in heath forest and two ages succession of ex-tin mineland (less than a hundred years and more than a hundred years). Study results showed that the soils generally were low Cation Exchange Capacity (CEC), organic matter, total nitrogen, available P, macro nutrient and clay content in soil texture. However in ex-tin mineland more than a hundred years, there is a trend of increasing of clay content also some soil parameters. Natural succession supported soil development even it take a very long of time. Restoration on these soil conditions should augmented the organic matter to repare the texture and make up the CEC by applying Legume Cover Crop (LCC) and Seed Soil Augmentation (SSA) technique.Keywords : heath forest, restoration, soil properties, SSA, tin mining.
PENGARUH TINGKAT PENGGENANGAN TERHADAP PERTUMBUHAN SEMAI PEDADA (SONNERATIA CASEOLARIS (L.) ENGLER) DI KAWASAN MANGROVE TOL SEDYATMO ANGKE KAPUK, JAKARTA UTARA Purnama, Yuda; Hilwan, Iwan; Kusmana, Cecep
Jurnal Silvikultur Tropika Vol. 3 No. 1 (2012): Jurnal Silvikultur Tropika
Publisher : Departemen Silvikultur, Fakultas Kehutanan, Institut Pertanian Bogor (IPB)

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Abstract

Influence of Inundation Level Toward The Growth of Pedada Seedling (Sonneratia caseolaris (L.) Engler) in Mangrove Area Tol Sedyatmo Angke Kapuk, North Jakarta.Global warming that causing the melting of iceberg in the pole have an impact on rising of level sea which impact on mangrove forest ecosystems. So that, we need to know the information about species of mangroves that can be adapted to increasing sea level and also species that can support for mangrove rehabilitation. Purpose of this research is to elaborate the effect of inundation on seedling growth and determine the level of inundation that support the good seedling growth. This research used randomized block design with inundation level as a treatment. There were three treatments consisting of inundation until the limit of the root neck, inundation between ¼ stem height and ½ stem height, and inundation between ½ stem height and ¾ stem height. Mangrove species that is used in this research is 2 and 4 months years old seedling of S. caseolaris. The research results showed that the level of inundation of the root neck gives the best effect to seedling growth. However, S. caseolaris can adapt and having good growth at inundation up to ½ stem height. In general, the influence of inundation level give effect to the growth variable responses, except in height, length of internode, and height increment of seedling.
THE INITIAL STUDY ON COCOMULSA TO PUSH GROWTH OF JATI SEEDLING IN SUKAMAKMUR VILLAGE, BOGOR Hilwan, Iwan; Purnama, Yuda
Jurnal Silvikultur Tropika Vol. 3 No. 2 (2012): Jurnal Silvikultur Tropika
Publisher : Departemen Silvikultur, Fakultas Kehutanan, Institut Pertanian Bogor (IPB)

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Abstract

Teak (Tectona grandis L.f.) is a tree species was almost cultivated for log produced in Java, Indonesia. The purpose this research was to identified the influence of cocomulsa application for growth of teak seedling on the field. Cocomulsa was made from coconut-fiber use latex glue. Cocomulsa can take hold of soil moisture and can defend the weeds movement. Treatments in this research that are using of stake, herbicide, and hoe. The results of this study that interaction from stake and hoe combinations was influenced significantly to growth of plant circumference and high. Based on normality test, that occur disseminating of high and circumference average value to following date normality line, in where average  of high and circumference significant toward growth of teak. The result of calculation from minitab software indicate that the growth ofe teak seedling was not significant. That is because of unless the time from this research, monitoring just done in 2 months. Whereas teak is slow growing species with level of growth is long enough, so the different from that treatments have not seen in clear. Visually, teak plants with cocomulsa was better growth than teak without cocomulsa. And nominally, cocomulsa research toward growth of teak have not seen significant because of unless time for response observation from teak plant. So, in cocomulsa influence research next time that have to use fast growing species and take long time for observation.
CARBON EMISSION REDUCTION POTENTIAL THROUGH SUSTAINABLE FOREST MANAGEMENT IN FOREST CONCESSION OF PT SALAKI SUMMA SEJAHTERA, PROVINCE OF WEST SUMATERA Hilwan, Iwan; Indrawan, Andry; Supriyanto, Supriyanto; Rusolono, Teddy
Jurnal Manajemen Hutan Tropika Vol. 18 No. 3 (2012)
Publisher : Institut Pertanian Bogor (IPB University)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (882.755 KB) | DOI: 10.7226/jtfm.18.3.169-176

Abstract

A management unit (MU) of a forest concession holder implementing the sustainable forest management (SFM) principles, could be involved in reducing Emmission from Reforestation and Forest Degradation (REDD+) and carbon trading project. The fact the strategic in implementing the REDD+ and carbon trading in MU level is still lack of pilot project and methodology. Therefore, some scenarios must be developed and tested to find out the best potential of carbon credit in MU level. The objectives of the research were: to calculate carbon credit in some SFM scenarios, to analyze of carbon trading project feasibility, and to determine carbon stock recovery period of logged over area (LOA). The result revealed that carbon stock and carbon credit of LOA was affected by timber cutting intensity.  The 6th scenario with lowest annual allowable cutting (AAC) obtained greater carbon credit and profit coming from timber harvesting income and carbon trading. In other hand, this scenario has shortest duration of carbon stock recovery period (27 years) and shorter than its cutting cycle.  In this case, the MU has to recalculate and to decrease its AAC to have highest benefits from carbon trading in the same cutting cycle period.  It will provide double benefits from carbon trading, those are contribution in achieving the SFM purposes (production, ecology, social) and climate change mitigation.
RESPON PERTUMBUHAN BIBIT GMELINA ARBOREA ROXB. TERHADAP PERLAKUAN MEDIA TANAM DAN BIOSTIMULAN DI PERSEMAIAN PERMANEN IPB Rajagukguk, Johan Ariando; Setiadi, Yadi; Hilwan, Iwan; Mardatin, Noor Faiqoh
Jurnal Silvikultur Tropika Vol. 10 No. 1 (2019): Jurnal Silvikultur Tropika
Publisher : Departemen Silvikultur, Fakultas Kehutanan, Institut Pertanian Bogor (IPB)

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Abstract

Nursery activities were one important step in producing quality seedling. This study used a very low quality Gmelina seed with germination value of 9.8%. This value affected the ability of plants in responding to treatment. Input technology of growing media treatment and biostimulan needed to improve the quality of seedling. Sample of media planting collected from IPB permanent nursery. Applications biostimulan was using to help increased amount of plant roots. This study used a completely randomized factorial design with 7 replications. Observations for 8 weeks after planting (MST) found the media's treatment plant and biostimulan has significant effect on the parameters of diameter, height and total dry weight compared to control. Compost was the best medium in this study who had the highest NPK value compared to other media. Biostimulan concentration of 4% was proved improving the quality of Gmelina seedling in all media by increased the compactness of the roots of seedlings. The percentage increased in root dry weight (BKA), the largest found in the media mix of compost and mud. The best treatment in improving the quality of seeds Gmelina found in compost media and biostimulan 4% on all parameters of growth.Keywords: biostimulant, root compaction, seedling quality