Abstract. Karyati, Ipor IB, Jusoh I, Wasli ME. 2017. The diameter increment of selected tree species in a secondary tropical forest in Sarawak,. The diameter at breast height (DBH) increments of dominant tree species in a secondary forest can determine forest growth in the area. This study was conducted to investigate the DBH increments of the nine dominant tree species in a secondary tropical forest. A total number of 180 trees representing nine species, seven genera, and six families were selected for the assessment of DBH increments during two years of study. ) had shown a high growth rate during the assessment, while the other four species such as Macaranga gigantea Mull. Arg., Macaranga triloba Mull. Arg., Euodia glabra (Bl.) Bl., and Vitex pubescens Vahl. had 0.53, 0.48, 0.37, and 0.30 cm year -1 in DBH increments, respectively. The average DBH increments for the entire selected species was 0.86 cm year -1 for periodic measurement and 0.75 cm year -1 for monthly measurement. This information is needed in order to understand the succession process in the secondary forests. It is important for the selection of the suitable species in a reforestation and a rehabilitation projects.

The study of utilizing the diversity of non-timber forest product species by testing the value of cultural importance or Index of Cultural Significance (ICS) analysis aims to identify the species of non-timber forest products with highest importance value for local communities. The results of this study documented (1) list of species of non-timber forest products that have an important role in the Malay community in Tanjung Jabung, Jambi, including foodstuffs (51-77 plants), vegetable ingredients (21 plants), medicinal materials (> 77 plants), equipment materials (62 plants), pulp and paper materials (27 plants), and other non-timber forest products; (2) list of species of the potential non-timber forest products to be further developed as fruit-producing plants (12 species), vegetables (10 species), medicinal plants (6 species), pulp and paper-based plants (6 species), plywood (18 species), basic materials for manufacturing equipment, arts and other local technology (8 species); and (3) basic data on economic valuation studies of non-timber forest products. The potential species that have high importance value to be cultivated plants were rambai (Baccaurea spp.), cempunik (Artocarpus hispidum), durian (Durio zibethinus, Durio oxleyanus, and Durio spp.), and rambutan (Nephelium lappaceum and Nephelium spp.) for fruits, rotan jernang (Calamus draco and Calamus spp.) as a medicinal material, and other uses. Specifically the diversity of potential species of non-timber forest products will be discussed in this paper.

Amorphopallus paeoniifolius atau suweg merupakan salah satu jenis dari suku Araceae yang umbinya berpotensi untuk dikembangkan sebagai alternatif pangan karena memiliki kandungan gizi yang baik dan indeks glikemik yang rendah. Namun, perbanyakan suweg terkendala dalam ketersediaan bibitnya sehingga dibutuhkan alternatif perbanyakan, salah satunya dengan teknik kultur jaringan. Penelitian ini bertujuan untuk mendapatkan kombinasi media, jenis eksplan dan kondisi kultur yang optimal untuk perbanyakan suweg secara in vitro. Penelitian dilakukan dengan dua percobaan. Percobaan pertama yaitu regenerasi tunas dari eksplan tangkai daun yang ditanam pada media Murashige dan Skoog (MS) yang ditambahkan dengan BAP (0, 1, 2, dan 4 mg/l) dan NAA (0 dan 0,5 mg/l). Percobaan kedua yaitu regenerasi tunas dari eksplan tangkai daun dan kalus pada kondisi gelap dan terang. Hasil penelitian menunjukkan bahwa media MS dengan penambahan 2 mg/l BAP dan 0,5 mg/l NAA merupakan media yang paling baik bagi eksplan tangkai daun dalam pembentukan kalus, tunas dan akar yang ditandai dengan jumlah masing-masing adalah 75%, 50% dan 56,67%. Selanjutnya, eksplan berupa kalus lebih mudah memberikan respon membentuk tunas dan akar dibandingkan dengan tangkai daun, baik pada kondisi ruang penyimpanan gelap maupun terang.

<p>ABSTRACT</p><p>The purpose of this  research  was to determine  the effect of acclimatization media  on  N.  rafflesiana Jack. growth and to obtain the best acclimatization media. This research was conducted at Bogor Botanical Garden from June until September 2009. The research was done in  completely randomized design with threereplications. Five  kinds  media were used  as treatment,  i.e. rice   husk charcoal, cocopeat, sphagnum moss, bamboo leaf compost and combination media rice (rice husk charcoal : cocopeat = 1:1). The r esult showed that   all of the  media can be used  to  acclimate N.  rafflesiana  Jack. planlet.</p><p>Key words : acclimatization, in vitro,  media combination,  Nepenthes rafflesiana</p><p> </p><p>ABSTRAK</p><p>Penelitian  ini  bertujuan  untuk  mempelajari  pengaruh  macam  media aklimatisasi  terhadap pertumbuhan  N.  rafflesiana  Jack.  dan  untuk mendapatkan  media  yang  paling  sesuai  untuk  aklimatisasi. Penelitian dilakukan di Kebun Raya  Bogor dari bulan Juni sampai dengan September 2009. Rancangan yang digunakan dalam percobaan adalah Rancangan Acak Lengkap (RAL) dengan tiga ulangan. Lima jenis media  yang  dipergunakan sebagai  media  aklimatisasi  adalah  arang  sekam,  cocopeat,  sphagnum moss,kompos  daun  bambu dan kombinasi  media  campuran  (arang sekam  : cocopeat  = 1:1).  Hasil  percobaan menunjukkan bahwa semua media dapat digunakan untuk aklimatisasi planlet N. rafflesiana Jack.</p><p>Kata  kunci: aklimatisasi, in vitro,  kombinasi media,  Nepenthes rafflesiana</p>

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