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Jurnal Penelitian Hutan Tanaman
Published by Badan Penelitian dan Penegembangan Kehutanan
ISSN : 18296327     EISSN : 24428930     DOI : -
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Decision Sciences, Operations Research & Management
Arjuna Subject : -
Articles 5 Documents
 1 
Search results for , issue "Vol 17, No 1 (2020): JURNAL PENELITIAN HUTAN TANAMAN" : 5 Documents clear
PENDUGAAN INSTAR LARVA ULAT KANTONG Pteroma plagiophleps HAMPSON PADA SENGON BERDASARKAN LEBAR KAPSUL KEPALA DAN UKURAN KANTONG (Instar Larvae Estimation of Pteroma plagiophleps Hampson Bagworm in Albizia Based on Head Capsule Width and Bag Size) Ujang Wawan Darmawan; Hermanu Triwidodo; Purnama Hidayat; Noor Farikhah Haneda
Jurnal Penelitian Hutan Tanaman Vol 17, No 1 (2020): JURNAL PENELITIAN HUTAN TANAMAN
Publisher : Pusat Penelitian dan Pengembangan Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (447.938 KB) | DOI: 10.20886/jpht.2020.17.1.15-26

Abstract

                                           ABSTRACT                                   Pteroma plagiophleps bagworm is an important insect pest of albizia. It is necessary to understand the development stages of the larvae as the basis for its control. The research aims to determine the number of instars and the rate of increase in larval size based on the width of the head capsule. Furthermore, larval bag size as an easily observable variable was used to estimate the instar stage. Instar number and the size range were determined by non linear regression, while the instar stage was estimated by the regression equation using bag diameter and length. We concluded that the larvae experienced four instars. The head capsule of larvae grew regularly following Dyar’s pattern, with the value approximately 1.42. The bag size of instar 1, instar 2, instar 3, and instar 4 were estimated as a range from 0-2.19 mm; 2.19-3.55 mm; 3.55-6.10 mm; and more than 6.10 mm in length respectively. The bag length was reasonable to be used as a reliable predictor of the instar stage.                                             ABSTRAKUlat kantong Pteroma plagiophleps merupakan serangga hama penting pada tanaman sengon. Perkembangan larvanya perlu diketahui sebagai dasar pengendaliannya. Penelitian ini bertujuan untuk menentukan jumlah instar dan laju pertambahan ukuran larva berdasarkan lebar kapsul kepalanya. Selain itu, juga untuk menduga instarnya dengan menggunakan ukuran kantong larva. Jumlah instar dan kisaran ukurannya ditentukan menggunakan persamaan regresi non linear, sedangkan tingkat instar diturunkan dari persamaan regresi linear menggunakan peubah ukuran diameter dan panjang kantong. Hasil penelitian menunjukkan bahwa larva ulat kantong diduga mengalami empat instar. Pertumbuhan larva mengikuti pola yang relatif konstan dengan nilai “koefisien Dyar” rata-rata 1,42. Dugaan ukuran panjang kantong larva instar 1, instar 2, instar 3, dan instar 4 masing-masing memiliki kisaran antara 0-2,19 mm 2,19-3,55 mm, 3,55-6,10 mm, dan lebih dari 6,10 mm. Peubah panjang kantong larva cukup baik untuk digunakan sebagai penduga instar larva.
PENINGKATAN PERTUMBUHAN DAN HASIL KARET MELALUI SISTEM TUMPANG SARI BERBASIS KARET (Improvement The Growth and Yield of Rubber Through Rubber Based Intercropping System) Sahuri Sahuri
Jurnal Penelitian Hutan Tanaman Vol 17, No 1 (2020): JURNAL PENELITIAN HUTAN TANAMAN
Publisher : Pusat Penelitian dan Pengembangan Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (118.695 KB) | DOI: 10.20886/jpht.2020.17.1.27-40

Abstract

                                                          ABSTRACTThe rubber intercropping system with other economic crops can increase land productivity  and rubber productivity. This study aimed to research the effects of intercropping treatments towards soil fertility, development of rubber girth expansion, latex yield, and potential intercrops yields. The study was conducted at the experimental plantation of Sembawa Rubber Research Center using a Randomized Block Design with three replications. The treatment factors are four cropping patterns, i.e: PT1 (monoculture rubber); PT2 (rubber pineapple); PT3 (rubber+sweet corn); and PT4 (rubber+cayenne pepper). Observed parameters in this study included rubber girth expansion, bark thickness, amount of tappable trees, amount of latex yield, and amount of potential intercrops yields. The data were statistically analyzed using ANOVA, followed by DMRT at the level of 5%. The results showed that intercropping treatment significantly affects the growth of rubber trees and reduces unproductive plant phases. Rubber trees in the intercropping treatment were ready for tapping five months earlier than in the monoculture rubber trees. However, the bark thickness was similar to that of the monoculture rubber trees. Intercropping treatments had no effect on latex yield per tree per tapping, but yield per hectare was greater in the intercropping treatments than monocultur rubber trees due to the number of trees that could be tapped was significantly higher.                                                              ABSTRAKTumpang sari karet dengan tanaman ekonomis lainnya dapat meningkatkan produktivitas  lahan dan produktivitas karet. Penelitian ini bertujuan untuk mengetahui pengaruh perlakuan tumpang sari terhadap kesuburan tanah, pertumbuhan lilit batang karet/keliling batang karet, hasil lateks, dan potensi hasil tanaman sela. Penelitian dilaksanakan di Kebun Percobaan Pusat Penelitian Karet Sembawa menggunakan Rancangan Acak Kelompok dengan tiga ulangan. Faktor perlakuan ada empat pola tanam, yaitu PT1 (karet monokultur); PT2 (karet+nanas); PT3 (karet+jagung manis); dan PT4 (karet+cabai rawit). Parameter yang diamati meliputi: lilit batang karet, tebal kulit batang, matang sadap pohon karet, hasil lateks, potensi hasil tanaman sela dan analisis kesuburan tanah. Hasil penelitian menunjukkan bahwa perlakuan tumpang sari berpengaruh nyata terhadap peningkatan pertumbuhan pohon karet dan mengurangi fase tanaman yang tidak produktif. Pohon karet dengan perlakuan tumpang sari siap untuk disadap lima bulan lebih awal daripada pohon karet monokultur. Sementara ketebalan kulit batang karet tidak berbeda nyata daripada pohon karet monokultur. Perlakuan tumpang sari tidak memberikan pengaruh terhadap  hasil lateks per pohon per penyadapan, tetapi hasil per hektar lebih besar dengan perlakuan tumpang sari karena jumlah pohon yang dapat disadap lebih tinggi secara nyata.  
POLA KERAPATAN DAN KERAGAMAN TEGAKAN HUTAN DIPTEROKARPA SEKUNDER (Pattern of Density and Diversity of Secondary Dipterocarps Forest Stand) Farida Herry Susanty
Jurnal Penelitian Hutan Tanaman Vol 17, No 1 (2020): JURNAL PENELITIAN HUTAN TANAMAN
Publisher : Pusat Penelitian dan Pengembangan Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (406.259 KB) | DOI: 10.20886/jpht.2020.17.1.41-51

Abstract

                                                                                                                          ABSTRACTThe assessment of dipterocarp secondary forest recovery has important parameters namel stand density and diversity of forest species composition. This study aims to determine trends in patterns of change in density and diversity of secondary dipterocarp stands innatural forests based on variations in logging aged as projections of natural recovery thatoccurs in production natural forests. The study was conducted at the Natural Forest IUPHHK of PT. Gunung Gajah Abadi, Wahau, East Kalimantan. Data collection period on 2016-2019 by building temporary sampling plots of 11 plots (11 hectares) on 7 variations of logging aged. Density parameters (i.e. number of trees and basal area per unit areaand diversity (number of species, heterogeneity index, species abundance and evennessindex) of Dipterocarp secondary forest stands will vary over the logging aged. The form ofthe relationship of stand density, abundance index and species evenness index islogarithmic regression form, while for base field parameter, the number and index ofspecies diversity are polynomial or quadratic regression. Aged stands after logging is factor that influences quite a large number of species composition, but is not large enoughfor other stand density and diversity parameters.                                                            ABSTRAK Penilaian pemulihan hutan sekunder dipterokarpa mempunyai parameter penting, yaitu kerapatan tegakan dan keragaman komposisi jenis hutan. Penelitian ini bertujuan untuk mengetahui kecenderungan pola perubahan kerapatan dan keragaman tegakan pada hutan alam dipterokarpa sekunder berdasarkan variasi umur tebangan sebagai proyeksi tingkat pemulihan (recovery) alami yang terjadi pada hutan alam produksi. Penelitian dilaksanakan di IUPHHK Hutan Alam PT Gunung Gajah Abadi, Wahau, Kalimantan Timur. Periode pengumpulan data pada tahun 2016-2019 dengan pembuatan plot sampling temporer sebanyak 11 plot (seluas 11 ha) pada tujuh variasi umur tebangan. Parameter kerapatan (jumlah pohon dan bidang dasar per satuan luas) dan keragaman (jumlah jenis, indeks keanekaragaman, kelimpahan jenis dan indeks kemerataan jenis) tegakan hutan sekunder dipterokarpa akan bervariasi sepanjang umur tebangan. Bentuk hubungan parameter kerapatan tegakan, indeks kelimpahan dan indeks kemerataan jenis adalah berbentuk regresi logaritma, sedangkan untuk parameter bidang dasar tegakan, jumlah dan indeks keanekaragaman jenis berbentuk regresi polynomial atau kuadratik. Umur tegakan setelah penebangan merupakan faktor yang memengaruhi cukup besar terhadap komposisi jumlah jenis, tetapi tidak cukup besar untuk parameter kerapatan dan keragaman tegakan lainnya.
KEANEKARAGAMAN HAYATI DAN ROSOT KARBON PADA RAWA-GAMBUT DI BUKIT BATU, KABUPATEN BENGKALIS, PROVINSI RIAU (Biodiversity and Carbon Sinks on Peat Swamps in Bukit Batu, Bengkalis Regency, Riau Province) N. M. Heriyanto; Dolly Priatna; Ismayadi Samsoedin
Jurnal Penelitian Hutan Tanaman Vol 17, No 1 (2020): JURNAL PENELITIAN HUTAN TANAMAN
Publisher : Pusat Penelitian dan Pengembangan Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (962.628 KB) | DOI: 10.20886/jpht.2020.17.1.53-67

Abstract

                                                 ABSTRACTResearch on biodiversity and carbon sinks is still needed by the government to support policies in order to manage forests sustainably. The purpose of this study was to analyze the composition of species, stand structure, biomass and carbon sinks on peat-swamps in Bukit Batu, Bengkalis Regency, Riau Province. The research method was carried out with an inventory of vegetation to determine the potential of stands, rejuvenation, biomass and carbon sinks. Sample plots were taken randomly in the form of measuring plots of 100 m x 100 m in each condition of old secondary forest, young secondary forest and old scrub forest in the peat-swamp protection forest. The species commonly found and evenly spread in all conditions of the peat-swamp forest were Gymnacranthera paniculata, Shorea teysmanniana, and Shorea gibbosa. The structure of the third stand condition of the peatswamp forest was still like a peat-swamp natural forest with the structure of the curve was in the shape of an inverted letter “J.” The three conditions of the peat-swamp forests have high biomass and carbon deposits with the highest content of those that were found in the old secondary forests, and the lowest was in the old scrub forests. The condition of the old secondary  forests has the highest potential to absorb carbon dioxide in the air. The tree species that are potentially used as seed sources were S. teysmanniana, S. gibbosa and Diospyros maingayi.                                                   ABSTRAK                                                               Penelitian keanekaragaman hayati dan rosot karbon masih diperlukan pemerintah untuk mendukung kebijakan dalam rangka mengelola hutan secara berkelanjutan. Tujuan penelitian ini adalah untuk menganalisis komposisi jenis, struktur tegakan, biomassa dan rosot karbonnya pada rawa-gambut di Bukit Batu, Kabupaten Bengkalis, Provinsi Riau. Metode penelitian dilakukan dengan cara inventarisasi vegetasi guna mengetahui potensi tegakan, permudaan, biomassa dan rosot karbon. Sampel plot diambil secara acak berupa plot berukuran 100 m x 100 m di setiap kondisi hutan sekunder tua, hutan sekunder muda dan hutan belukar tua pada hutan lindung rawa-gambut. Jenis Gymnacranthera paniculata, Shorea teysmanniana dan Shorea gibbosa ditemukan tersebar merata di setiap kondisi hutan rawa-gambut. Struktur tegakan ketiga kondisi hutan rawa-gambut masih seperti hutan alam rawa-gambut dengan kurva struktur tegakan berbentuk huruf “J” terbalik. Ketiga kondisi hutan rawa-gambut tersebut memiliki biomassa dan simpanan karbon yang tinggi dengan biomassa dan simpanan karbon tertinggi ada di hutan sekunder tua dan terendah di hutan belukar tua. Kondisi hutan sekunder tua berpotensi untuk menyerap karbon dioksida di udara yang tertinggi. Pohon yang potensial dijadikan sumber benih adalah pohon S. teysmanniana, S. gibbosa, dan Diospyros maingayi. 
SPESIES ULAT KANTONG DAN MUSUH ALAMINYA YANG BERASOSIASI DENGAN TANAMAN SENGON (Falcataria moluccana (Miq.) Barneby & J.W. Grimes) (Bagworms and Their Natural Enemies Associated with Albizia (Falcataria moluccana (Miq.) Barneby & J.W. Grimes plantation) Ujang Wawan Darmawan; Hermanu Triwidodo; Purnama Hidayat; Noor Farikhah Haneda; Neo Endra Lelana
Jurnal Penelitian Hutan Tanaman Vol 17, No 1 (2020): JURNAL PENELITIAN HUTAN TANAMAN
Publisher : Pusat Penelitian dan Pengembangan Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (414.913 KB) | DOI: 10.20886/jpht.2020.17.1.1-13

Abstract

                                                         ABSTRACTBagworms are reported as severe pests in albizia in some areas. The bagworms species that attacked the plant in Java had been identified but had not been described well. Their natural enemies also had not been identified in this area. This information is essential and related to pest control opportunities. This study described several species of bagworm and their natural enemies. It also described the characters of the bag as a marker of the bagworm type. Samples were collected from ten localities spread across Central and West Java.  Bagworms pupae were collected and reared so that the imago or natural enemies emerged. The parasitization rate against bagworm pupae was then determined. Imago and natural enemies were morphologically described, as are bags character. Four species of bagworm were associated with albizia stand, namely Pteroma plagiophleps, Chalia javana, Clania crameri, and Khopene cuprea. Description and desk study revealed synonymies among bagworm species. Morphologically, a bagworm species had a unique characteristic bag as a type in shape, pattern, and size. Natural enemies were commonly parasitic Hymenoptera and Diptera insects and entomopathogenic fungi. The bagworm species has been associated with a particular insect of the parasitoid. The many synonyms in the particular species need to be confirmed through a comprehensive depth study involving morphological (imago, bag, and larvae) and molecular approaches to overcome synonymies among bagworm species.                                                          ABSTRAK Ulat kantong sebagai hama serius pada sengon di beberapa daerah. Spesies ulat kantong yang menyerang sengon di Pulau Jawa sudah pernah diidentifikasi tetapi belum dideskripsikan dengan baik. Musuh alami ulat kantongnya juga belum pernah diidentifikasi. Informasi ini penting karena terkait peluang pengendaliannya. Tujuan penelitian untuk mendeskripsikan beberapa spesies ulat kantong yang menyerang sengon dan musuh alami yang berasosiasi dengannya serta mendeskripsikan karakter kantong sebagai penanda spesiesnya. Sampel diambil dari sepuluh lokasi yang tersebar di Jawa Tengah dan Jawa Barat. Pupa ulat kantong dikumpulkan, dipelihara, sehingga imago atau musuh alami keluar dan tingkat parasitisasi ditentukan. Imago dan musuh alami dideskripsikan secara morfologi, demikian juga dengan karakter kantongnya. Empat spesies ulat kantong teridentifikasi berasosiasi dengan sengon adalah Pteromaplagiophleps, Chalia javana, Clania crameri, dan Khopene cuprea. Deskripsi dan penelusuran pustaka menunjukkan banyaknya nama sinonim yang terkait spesies-spesies tersebut. Secara morfologi, setiap spesies ulat kantong memiliki karakter kantong yang khas baik bentuk, pola maupun ukurannya. Musuh alami ulat kantong umumnya adalah serangga Hymenoptera dan Diptera serta cendawan entomopatogen. Adanya asosiasi spesies ulat kantong dengan spesies parasitoid tertentu. Banyaknya sinonim pada spesies ulat kantong perlu dikonfirmasi melalui pendekatan yang komprehensif dengan menggabungkan metode berbasis morfologi (imago, kantong, dan larva) sekaligus molekuler. 

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