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INDONESIA
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 427 Documents
 37   38   39   40   41 
MODEL TAPER BAMBU BETUNG (The Taper Model of Dendrocalamus asper Backer ex Heyne) Lutfy Abdulah; Sutiyono Sutiyono
Jurnal Penelitian Hutan Tanaman Vol 16, No 1 (2019): JURNAL PENELITIAN HUTAN TANAMAN
Publisher : Pusat Penelitian dan Pengembangan Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (859.799 KB) | DOI: 10.20886/jpht.2019.16.1.47-57

Abstract

SariABSTRACTInformations on the individual growth of bamboo stems such as dimensions of node length, node diameter, and  wall-node thick are needed to increase bamboo processed yield. This study aimed to provide a model of growth estimation of individual growth of bamboo stems. Destruction method was used, and resulting data was sorted sorted by time. The correlation between age and dimensions was analyzed with cross-section technique. The results showed that there were a correlation among age with node diameter and node length, but no correlation with wall-node thick. Parameters of node length, total length of bamboo, and base node diameter significantly influenced the estimated diameter of each node. Node’s sequence number, node lengths, and base node diameter can be used to compile estimation model of the bamboo wall thickness. The uniqueness of bamboo model is the importance of node sequence.. This model can be used for sustainable development use of Dendrocalamus asper. ABSTRAKInformasi pertumbuhan individu batang bambu seperti dimensi panjang ruas, diameter ruas, dan tebal dinding  ruas bambu sangat diperlukan untuk tujuan peningkatan rendemen olahan bambu. Penelitian ini bertujuan untuk menyediakan model perangkat penduga pertumbuhan sehingga memudahkan dalam menduga pertumbuhan individu batang bambu. Metode yang digunakan adalah metode destruksi. Data yang dihasilkan diurutkan berdasarkan waktu dan selanjutnya dilakukan analisis dengan teknik cross-section sehingga dapat dibangun hubungan antara umur dengan dimensi bambu. Hasil penelitian menunjukkan bahwa ada hubungan antara umur dengan parameter diameter ruas dan panjang ruas, namun tidak dengan tebal dinding batang bambu. Parameter panjang ruas, panjang total bambu, dan diameter pada pangkal bambu berpengaruh nyata dalam menduga diameter setiap ruas. Sementara parameter nomor urut ruas, panjang ruas dan diameter pangkal dapat digunakan untuk menyusun model penduga ketebalan dinding ruas bambu. Keunikan dari model bambu ini adalah adanya parameter urutan ruas yang perlu dipertimbangkan. Model yang didapat dapat digunakan untuk penyusunan rencana pemanfaatan bambu petung secara berkelanjutan.  
PEMATAHAN DORMANSI DAN METODE UJI VIABILITAS BENIH LAMTORO (Leucaena leucocephala Lam. de Wit.) (Breaking Dormancy and Testing Method in Determining Seed Viability of Lamtoro (Leucaena leucocephala Lam. De Wit.) Eliya Suita
Jurnal Penelitian Hutan Tanaman Vol 16, No 2 (2019): JURNAL PENELITIAN HUTAN TANAMAN
Publisher : Pusat Penelitian dan Pengembangan Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (758.279 KB) | DOI: 10.20886/jpht.2019.16.2.59-72

Abstract

ABSTRACTDue to its hard seed coat condition, preliminary treatment is necessary to be applied to Lamtoro seed to improve its germination. The objective of this research was to figure out the best pre-treatment and testing method for improving seed viability and seed vigor of lamtoro. Completely randomized design with factorial patterns was arranged to assist analyzing the observed parameters. Pre-treatments for breaking seed dormancy was conducted including: control (without treatment), soaked seeds in plain water for 24 hours, soaked seeds in boiling water (100°C) and colded for 24 hours, soaked seeds in concentrated H2SO4  for 10 and 20 minutes, soaked seeds in 1% NaOCl for 5 and 10 minutes. The test results showed the best viability of lamtoro seed through sowing in both a greenhouse and laboratory that can increase germination, germination speed, germination rate and germination value was the treatment of soaked seeds in H2SO4 for 20 minutes. The best sowing test method in a greenhouse is obtained from a mixture of sand and soil media (1:1, v/v) covered with sand and in a laboratory with Top of Paper method. ABSTRAKBenih lamtoro mempunyai kulit yang keras sehingga untuk meningkatkan dan mempercepat perkecambahan diperlukan perlakuan pendahuluan agar mempunyai viabilitas dan vigor yang tinggi. Tujuan penelitian ini adalah mendapatkan perlakuan pendahuluan dan metode uji yang sesuai agar dihasilkan tingkat perkecambahan yang tinggi. Penelitian menggunakan rancangan acak lengkap pola faktorial dengan perlakuan: control (tanpa perlakuan), benih direndam air biasa selama 24 jam, benih direndam air panas (suhu 1000C) dan dibiarkan dingin selama 24 jam, benih direndam dalam H2SO4 pekat selama 10 dan 20 menit, serta benih direndam dalam NaOCl 1% selama 5 dan 10 menit. Hasil pengujian menunjukkan pengujian viabilitas benih lamtoro yang terbaik melalui penaburan di rumah kaca maupun di laboratorium yang dapat meningkatkan daya berkecambah, kecepatan berkecambah, laju perkecambahan dan nilai perkecambahan apabila diberikan perlakuan benih direndam dengan H2SO4 selama 20 menit. Metode uji penaburan terbaik di rumah kaca diperoleh dari media campuran pasir dan tanah (1:1, v/v) ditutup pasir dan di laboratorium  dengan metode uji di atas kertas.
KELAYAKAN EKONOMI KEGIATAN PEMULIHAN FUNGSI EKOSISTEM HUTAN LINDUNG GAMBUT SUNGAI BRAM ITAM DI KABUPATEN TANJUNG JABUNG BARAT, PROVINSI JAMBI (Economic Feasibility of Ecosystem Functions Recovery at Sungai Bram Itam Protected Peatland Forest, Tanjung Jabung Barat District, Jambi Province) Dhany Yuniati; Darwo Darwo; Rina Bogi Darmanti
Jurnal Penelitian Hutan Tanaman Vol 16, No 2 (2019): JURNAL PENELITIAN HUTAN TANAMAN
Publisher : Pusat Penelitian dan Pengembangan Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (689.388 KB) | DOI: 10.20886/jpht.2019.16.2.87-101

Abstract

 ABSTRACTPart areas of Protected Peatland Forest (PPF) Bram Itam River have been converted into agricultural and plantation areas. Consequently, it causes damage to its protected area function. To restore the ecosystem, a study is needed by considering ecological, social, and economic aspects through the establishment of demonstration plot in the Bram Itam River PPF. The aim of the study was to analyze the economic feasibility of three planting patterns on demonstration plots. Economic feasibility parameters evaluated include financial feasibility, continuity in generating income and the ability to meet the needs of farmer’s households lives. The analysis showed that from the aspect of financial feasibility, all cropping patterns deserve to be developed. From the aspect of continuity in generating income, the applied cropping pattern can provide continuous income. However, from the aspect of the ability to meet the household needs of the farmer, the proportion of 25% native species of peatland (275 trees/ha) and 75% areca nut (825 plants/ha) is needed. To increase household income, it is necessary to have an off farm intervention and diversification of peatland management; so that the needs of farmer households are fulfilled and can reduce pressure on peat land in the Bram Itam River PPF area.ABSTRAKSebagian kawasan Hutan Lindung Gambut (HLG) Sungai Bram Itam telah beralih fungsi menjadi areal pertanian dan perkebunan sehingga menyebabkan kerusakan fungsi lindung kawasannya. Untuk memulihkan ekosistemnya diperlukan kajian dengan mempertimbangkan aspek ekologi, sosial, dan ekonomi melalui pembangunan demplot pola-pola penanaman di kawasan HLG Sungai Bram Itam. Tujuan penelitian adalah untuk menganalisis kelayakan ekonomi dari tiga pola penanaman yang dikembangkan pada demplot uji coba. Parameter kelayakan ekonomi yang dievaluasi meliputi kelayakan finansial, kontinyuitas dalam menghasilkan pendapatan, dan kemampuan untuk mencukupi kebutuhan hidup rumah tangga petani. Hasil analisis menunjukan bahwa dari aspek kelayakan finansial, ketiga pola tanam layak untuk dikembangkan. Dari aspek kontinyuitas dalam menghasilkan pendapatan, semua pola tanam yang dikembangkan dapat memberikan pendapatan secara kontinyu. Namun dari aspek kemampuan untuk mencukupi kebutuhan rumah tangga petani hanya pola tanam dengan komposisi 25% tanaman asli gambut (275 pohon/ha) dengan 75% tanaman pinang (825 pohon/ha) yang dapat memenuhi kebutuhan hidup rumah tangga petani. Untuk meningkatkan pendapatan rumah tangga petani, maka diperlukan adanya intervensi off farm dan diversifikasi pengelolaan lahan gambut agar kebutuhan rumah tangga petani tercukupi dan sekaligus dapat mengurangi tekanan terhadap lahan gambut di kawasan HLG Sungai Bram Itam.
DISTRIBUSI TANAMAN DAN NILAI EKONOMI HUTAN KEMASYARAKATAN DI KECAMATAN BATUKLIANG UTARA KABUPATEN LOMBOK TENGAH (Plant Distribution and Economic Value of Community Forests in North Batukliang Sub-district, Central Lombok Regency) Chairil Anwar Siregar; Alfonsus H. Harianja; Dalilah Dalilah; Sidiq Cahyono; Soraya Ulfah
Jurnal Penelitian Hutan Tanaman Vol 16, No 2 (2019): JURNAL PENELITIAN HUTAN TANAMAN
Publisher : Pusat Penelitian dan Pengembangan Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (841.753 KB) | DOI: 10.20886/jpht.2019.16.2.115-131

Abstract

ABSTRACTCommunity forest (HKm) as one scheme of social forestry has been established in Central Lombok Regency since 1999 and was legalized in 2010. The HKm covered an area of 1,809.5 ha and has formed an agroforestry pattern since it was first established 13 years ago. However, the plant distribution and economic value of production area remain unknown. Therefore this research is designed to record plant composition and calculate the economics value of HKm in the research area. Survey method using analysis of vegetation was carried out to measure the plant composition. Sampling intensity was 0.01% or 1.81 ha with a total number of sample plots were 45. Survey was also used to calculate the economic value, with sampling intensity of 1% or in total 32 households. The results showed that the plant composition consists of mature trees (2.02%), young trees (4.12%), sapling (26.44%) and seedling (67.41%). The plant density was 11,462 ind/ha and dominated by Coffea sp., Musa sp., Durio zibethinus, Theobroma cacaoa and Arthocarpus heterophyllus with proportion of 24.08%; 13.70%; 9.25%; 7.48% and 5.30%, respectively. Total economic value in the average was Rp 6,366,484/household/year or Rp 530,540/household/month. There was a downward trend in HKm production due to increased vegetation coverage. Exchange rate of HKm commodities can be improved by applying supporting strategic programs in HKm developments.   ABSTRAKPembangunan Hutan Kemasyarakatan (HKm) di Kabupaten Lombok Tengah telah dimulai sejak tahun 1999 dalam bentuk ijin sementara pengelolaan HKm dan kemudian diterbitkan Ijin Usaha Pengelolaan Hutan Kemasyarakatan (IUP-HKm) pada tahun 2010 dengan luas areal 1.809,5 ha. Kawasan HKm dalam waktu tiga belas tahun (2000-2013) telah  membentuk formasi hutan pola agroforestri. Namun demikian, distribusi tanaman dan nilai produksi kawasan belum diketahui. Untuk itu dilaksanakan penelitian guna mengetahui komposisi tanaman dan nilai produksinya. Penelitian dilaksanakan menggunakan metode survei dengan melakukan analisa vegetasi untuk mengetahui distribusi tanaman dengan intensitas sampling sebesar 0,01% atau 1,81 ha dengan jumlah plot sebanyak 45 unit. Untuk mengetahui nilai ekonomi dari produksi tanaman dalam HKm, dilaksanakan wawancara terhadap petani penggarap HKm dengan intensitas sampling 1% atau sebanyak 32 petani. Hasil penelitian menunjukkan bahwa komposisi tanaman yang ada dalam areal HKm terdiri dari strata pohon sebesar 2,02%, tiang 4,12%, pancang 26,44% dan semai 67,4%. Kerapatan tanaman 11.462 btg/ ha yang didominasi oleh tanaman kopi (Coffea sp.), pisang (Musa sp.), durian (Durio zibethinus), coklat (Theobroma cacao) dan nangka (Arthocarpus heterophyllus) dengan proporsi berturut-turut 24,08%; 13,70%; 9,25%; 7,48% dan 5,30%. Nilai ekonomi yang diperoleh rumah tangga petani rata-rata sebesar Rp 6.366.484/tahun atau Rp 530.540/bulan. Terdapat kecenderungan penurunan nilai produksi HKm akibat semakin meningkatnya penutupan lahan. Untuk meningkatkan nilai tukar komoditas HKm, diperlukan program strategis yang dapat mendorong pembangunan HKm.
POTENSI DAN HABITAT TEMPAT TUMBUH KETAK (Lygodium circinnatum (Burn. F.) Swartz) DI LOMBOK (Potency and Growth Habitat of Lygodium circinnatum (Burn. F.) Swartz) in Lombok) I Wayan Widhana Susila; Ogi Setiawan; M Hidayatullah
Jurnal Penelitian Hutan Tanaman Vol 16, No 2 (2019): JURNAL PENELITIAN HUTAN TANAMAN
Publisher : Pusat Penelitian dan Pengembangan Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jpht.2019.16.2.103-114

Abstract

ABSTRACTKetak (Ligodium circinnatum) is a superior Non-Timber Forest Product in West Nusa Tenggara. The research aimed to obtain data on potential, distribution, and growth habitat of ketak in Lombok Island. The study was conducted by purposive sampling inventory; the first line took randomly and the next line took systematically. Ketak was found in the Malimbu and Pusuk Forest (West Rinjani Protected Forest Management Unit (PFMU)), while in the East Rinjani PFMU was found in Lang-lang, Mentareng, and Obel-Obel. The potency for ketak in Lombok is relatively low i.e. 443 clumps/ha, 5.2 tendrils/clump and harvested aged 3 tendrils/clump. Any trees be able as climbing tree. Ketak grows well at altitude of less than 400 m above sea level, sloping to steep slopes, climate types C to E, rainfall 935 to 1,511 mm/year, temperatures 24-320C, humidity 50-88%, and light intensity 120 to 3,872 luxs. Ketak growths in soil characteristic as follow:granular structure, sandy texture, slightly acid to neutral pH, good absorption rate, and growth capability under low nutrient level.                                                     ABSTRAKKetak (Ligodium circinnatum) merupakan jenis Hasil Hutan Bukan Kayu unggulan di Nusa Tenggara Barat. Saat ini terjadi penurunan suplai bahan baku untuk kerajinan ketak di Lombok. Penelitian bertujuan untuk memperoleh informasi potensi, sebaran, dan tempat tumbuh ketak di Pulau Lombok. Penelitian dilakukan dengan cara inventarisasi dengan metode sampling secara purposif dan peletakan jalur (transek) pertama secara acak, kemudian jalur berikutnya secara sistematis. Rumput ketak ditemukan di Kawasan Hutan Malimbu dan Pusuk (Kesatuan Pemangkuan Hutan Lindung (KPHL) Rinjani Barat), sedangkan di KPHL Rinjani Timur ada di Kawasan Hutan Lang-lang, Mentareng, dan Obel-Obel. Potensi ketak di Lombok relatif rendah dengan jumlah rumpun 443 rumpun/ha, jumlah sulur 5,2 batang sulur/rumpun dan jumlah sulur yang siap dipanen 3 batang/rumpun. Semua jenis pohon bisa menjadi pohon pemanjat rumput ketak. Di Nusa Tenggara Barat rumput ketak mampu tumbuh diketinggian kurang dari 400 mdpl, lereng landai sampai curam, tipe iklim C sampai E menurut Schmidt dan Fergusson, curah hujan 935-1.511 mm/tahun, temperatur 24-320C, kelembaban50–88%, intensitas cahaya 120-3.872 lux. Ketak tumbuh pada kondisi tanah dengan struktur granuler, tekstur fraksi berpasir, pH tanah agak asam sampai netral, laju resapan air baik, dan bisa tumbuh baik sampai kondisi hara rendah.
PERTUMBUHAN EMPAT POPULASI CEMPAKA (Michelia champaca Linn.) UMUR EMPAT TAHUN (Growth of four populations of cempaka (Michelia champaca Linn.) at four years old) Murniati Murniati; Hani S. Nuroniah; Darwo Darwo
Jurnal Penelitian Hutan Tanaman Vol 16, No 2 (2019): JURNAL PENELITIAN HUTAN TANAMAN
Publisher : Pusat Penelitian dan Pengembangan Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1145.95 KB) | DOI: 10.20886/jpht.2019.16.2.73-85

Abstract

ABSTRACTEx-situ conservation is highly beneficial in protecting biodiversity, especially to save certain species from extinction. Cempaka (Michelia champaca Linn.) is a tree species that is getting rare as its natural population at some areas were difficult to be discovered. Cempaka tree produces not only wood, but also flowers that can be used for perfumery raw materials and essential oils. Therefore, cempaka species needs to be conserved, either through in-situ or ex-situ method. In order to support ex-situ conservation, a plot of cempaka was established in 2011 at Pasir Hantap Research Forest, Sukabumi District-West Java. The genetic materials were collected from four populations, consisted of 42 mother trees divided by Lahat population (9 mother trees), Empat Lawang population (6 mother trees), Malang population (13 mother trees), and Pasuruan population (14 mother trees). Sub plots were designed based on the seedlings origin (population) and distance among sub plots were ≥ 50 m to avoid cross pollination among populations. The plots were maintained regularly, including weeding, fertilizing, and pest control. Growth observation of cempaka plants was conducted every six months up to 36 months old and then every one year afterwards. The observation consists of survival rate, height and diameter of cempaka stems. Average survival of cempaka plants at 48 moths old was 82.4%, the highest survival was found at Lahat population (94.8%). The highest height and diameter were found at Lahat population as well, i.e. 7.35 m and 13.1 cm, respectively. The lowest survival rate was found at Malang population (64.0%), meanwhile the lowest height and diameter growth were found at Pasuruan provenance, i.e. 2.99 m and 3.9 cm, respectively. It can be concluded that the highest growth, meaning its best performance of cempaka plants was shown by Lahat provenance. It implies that characteristics of mother trees and the seed quality gave a significant effect to the cempaka plant growth. ABSTRAKKonservasi ex-situ berfungsi untuk melindungi biodiversitas, terutama jenis-jenis yang terancam punah. Cempaka (Michelia champaca Linn.) termasuk dalam jenis yang semakin jarang ditemukan di populasi alaminya. Selain dimanfaatkan kayunya, bunga cempaka dipanen sebagai material parfum dan minyak. Sebagai salah satu upaya konservasi ex-situ, plot cempaka dibangun pada tahun 2011 di Hutan Penelitian Pasir Hantap, Sukabumi-Jawa Barat. Material genetik (biji) dikoleksi dari empat populasi cempaka yaitu dari 42 pohon induk yang terdiri atas : Lahat (9 pohon induk), Empat Lawang (6 pohon induk), Malang (13 pohon induk), dan Pasuruan (14 pohon induk). Plot penanaman dirancang berdasarkan asal populasi, selanjutnya jarak plot antar populasi minimal 50 m untuk menghindari terjadinya persilangan antar populasi. Pemeliharaan plot dilakukan secara berkala meliputi penyiangan, pemupukan dan pengendalian hama penyakit. Pengukuran performa pertumbuhan dilakukan setiap 6 bulan hingga umur 36 bulan setelah tanam; dan satu tahun sekali setelahnya. Performa pertumbuhan yang diamati meliputi daya hidup, tinggi dan diameter batang diatas tanah. Daya hidup cempaka pada umur 48 bulan rata-rata sebesar 82,4% dan daya hidup tertinggi ditunjukkan oleh cempaka dari populasi Lahat (94,8%). Tinggi dan diameter tertinggi ditunjukkan oleh cempaka dari populasi Lahat yaitu 7,35 m dan 13,1 cm. Daya hidup terendah ditemukan pada cempaka populasi Malang (64,0%). Tinggi dan diameter pohon terendah teramati pada cempaka populasi Pasuruan yaitu 2,99 m dan 3,9 cm. Populasi terbaik berdasarkan pengamatan performa pertumbuhannya ditunjukkan oleh populasi Lahat. Dari penelitian ini dapat disimpulkan bahwa karakteristik pohon induk dan kualitas benih cempaka berpengaruh terhadap pertumbuhan tanaman cempaka.
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. 

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