61 research outputs found
A tree species inventory in a one-hectare plot at the Batang Gadis National Park, North Sumatra, Indonesia
No full textKARTAWINATA, KUSWATA; SAMSOEDIN, ISMAYADI; HERIYANTO, M. AND AFRIASTINI, J. J. 2004. A tree species inventory in a one-hectare plot at the Batang Gadis National Park, North Sumatra, Indonesia. Reinwardtia 12 (2): 145 – 157. The results of the inventory of trees with DBH ≥ 10 cm shows that 184 species in 41 families, represented by 583 individuals with the total basal areas of 40.56 m² occurred in the one-hectare plot sampled. Together with the saplings and shrubs the number of species was 240 belonging to 47 families. The forest is richer in tree species than other lowland forests in North Sumatra, but poorer than those in Borneo and the Malay Peninsula. Dipterocarps constituted 18.42 % of total species with basal area of 18.99 m² or 46.82 % of the total basal area in the plot. The most prominent species was Shorea gibbosa. Hopea nigra, reported to be rare in Bangka and Belitung, occurred here as one of the ten leading species. The species-area curve shows that a considerable number of additional species was encountered more or less steadily up to one hectare and there was no indication of levelling off. A simulated profile diagram shows the forest may be stratified into five layers: (1) emergent layer, (2) upper canopy, (3) middle canopy, (4) lower canopy and (5) ground canopy. Dipterocarps were leading species in the emergent layer, upper canopy and middle canopy. Only 82 species were regenerating as represented by their presence in the sapling stage ranging from 5 to 50 plants/hectare. Macaranga lowii King ex Hook. f. dominated the section which seemed to be previously occupied by gaps
Evaluasi Jenis Pohon bagi Konservasi Keragaman Tanaman Hutan Kota di DKI Jakarta
No full textUrban forest in Indonesia can only be declared if it has been approved by the competent authorities in accordance with Goverment Regulation PP No. 63/2002. Therefore, it is necessary to evaluate the diversity of plant species in the urban forest. The purpose of this study is to analyze the plant diversity in the urban forest, and to analyze the physical condition of the urban forest’s trees. This study was conducted in three selected urban forest in DKI Jakarta, i.e. Indonesian University (UI), Srengseng and PT. JIEP. Vegetation Analysis and Shannon Wiener Index were used as a method for analyzing the plant diversity. In this study, the physical condition of the trees also were observed by scoring the physical criterias of the existing tree condition. Result for this analysis were used as input to urban forest management recommendations using SWOT analysis. The result showed that the diversity of tree species in three selected urban forest is moderate (1 < H’ < 3). Indigenous species in UI and PT. JIEP predominant were found than in Srengseng urban forest. While the physical condition of trees in PT. JIEP urban forest have the highest levels of damage compared to the other two urban forest. Suitability of ecological functions of trees examined by urban forest type, shows that PT. JIEP Urban Forest as a buffer for industry region has only 30% of trees that have either category as absorbing gaseous pollutants. While the UI Urban Forest and the Srengseng Urban Forest, ecological functions of trees based on the type of urban forest have been appropriate for the city to provide comfort for visitors. Recommendations of Urban forest management are produced from SWOT analysis. It is resulted 10 recommendations for trees biodiversity conservation in urban forest based on internal factor and external factor of the three selected urban forest in DKI Jakarta
Analisis cadangan karbon pohon pada lanskap hutan kota di DKI Jakarta
No full textIn order to reduce enviromental problem, such as air polutions and increasing of air temperature in DKI Jakarta caused the presence of urban forest is very neccessary. Tree has an inportant role becouse its function as store carbon and most efficient carbon sinks in urban areas. Urban forest in DKI Jakarta has problems in development, beside technical aspects are also affected by the goverment policy. The objectives of research were (1) to analyze tree carbon stock, CO2 sequestration and tree species that have potential of carbon, and (2) to analyze policies that support the development of urban forest. The study was conducted at DKI Jakarta, which was focused on tree urban forests, i.e. University Indonesia (Jakarta Selatan), Srengseng (Jakarta Barat) and PT JIEP (Jakarta Timur). The research location was determined by using purposive sampling method, which is based on the representation of the main functions of the urban forest landscape services. Data was collected through survey method. The selection of respondents was conducted by purposive sampling. Sampling plots determination was done by purposive sampling method. Square plot with a size of 20 m x 20 m is used in this research. Determination of tree biomass is done by non-destructive sampling method and tree carbon stocks by using biomass content formula. CO2 uptake values was determined by using the comparative of relative molecular mass CO2 : 3.67 x carbon stocks. Wood density obtained from the database of wood density of trees world agroforestry. Carbon stock analysis was calculated by using allometric equation and urban policy analysis was executed by Analytical Hierarchy Process (AHP) approach. The largest tree carbon stocks were found on UI urban forest was 178.82 ton/ha, Srengseng was 24.04 ton/ha and PT JIEP was 23.64 ton/ha. The largest CO2 uptake generated from UI urban forest was 634.40 ton/ha, Srengseng was 88.15 ton/ha and PT JIEP was 86.76 ton/ha. Factors that affecting the enhancement of carbon stocks, i.e. stem diameter, tree density and the age of the trees. CO2 uptake value resulting from the biggest urban forest UI was 634.40 ton/ha, followed by Srengseng 88.15 ton/ha and PT JIEP 86.76 ton/ha. This information illustrates that in addition for conservation of biodiversity, water uptake and aesthetics landscape, urban forest also has the potential in reducing CO2. Tree of fabaceae family, i.e. Acacia crassicarpa A.Cunn.Ex.Benth, Acacia mangium Willd, Paraserianthes falcataria L, Leucaena leucocephala L, Bauhinia purpurea L, Delonix regia Boj Ex.Hook, Pterocarpus indicus Willd, Erythrina crista-galli L and Abrus precarorius are found that they have biggest contribution for tree carbon stocks in study sites. Policy priorities the supporting the development of urban forest in level factor are increasing of urban forests quality, level actor are government and level alternative are rules evaluation and urban forest expantion
Laporan Kerja Eksplorasi Plasma Nutfah Nabati Bogor, 27 November - 22 Desember 1978: Eksplorasi plasma nutfah ubi kayu (manihot esculenta crantz) di daerah Bogor dan sekitarnya
No full textUbi kayu ( Manihot esculenta Crantz ), adalah salah satu sumber bahan pangan yan berpotensi untuk dikembangkan, mengingat kandungan karbohidratnya yang tinggi. Menyempitnya areal pertanaman ubi kayu dewasa ini sangat mengkhawatirkan kelestarian varietas-varietas lokal, yang berpotensi untuk dikembangkan atau disadap sifat-sifat baik yang dimilikinya dalam usaha merakit varietas unggul baru.Dalam rangka pelestarian plasma nutfah ubi kayu, telah dilakukan eksplorasi selama sepuluh hari di kabupaten Bogor dan sekitarnya. Sebanyak 52 contoh koleksi telah dikumpulkan dari berbagai lokasi, mencakup 25 varietas ubi kayu yang seluruhnya akan dibina sebagai koleksi hidup. Di samping itu telah pula dikumpulkan 48 spesimen herbarium.16 hal
DINAMIKA KEANEKARAGAMAN JENIS POHON PADA HUTAN PRODUKSI BEKAS TEBANGAN DI KALIMANTAN TIMUR
No full textBiodiversity and sustainability in the Bulungan Research Forest, East Kalimantan, Indonesia: the response of plant species to logging
No full textThis study reports forest structure, regeneration and the soil properties from
unlogged and logged forest in the Bulungan Research Forest, Malinau District, East
Kalimantan, Indonesia. Four sites were compared by using four 1-ha replicate plots
in each of primary forest (PF), 5, 10 and 30-yr old logged forest (LF-5, LF-10, LF-
30).
The tree species composition differ among forest types, as it was shown that the mean value of similarity indices for all pairs were 0.215 (for the Jaccard index) and 0.353 (for the Sorensen index). The low values for similarities among forest types were most probably caused by low numbers of species shared between each forest type. Both correlation values, r = 0.023 for Jaccard index and r = 0.031 for Sorensen index, showed no strong correlation between the similarity index (C) and the distance between forest types. This supports the use of a chronosequence approach.
A total of 914 tree species with ³ 10 cm dbh were recorded from 223 genera and 65 families. There were no significant differences in mean species numbers (166 – 180/ha) among treatments. Mean density of species was lower in LF-5 and LF-10 (501/ha) than in PF or LF-30 (605/ha and 577/ha); similarly to mean basal area (LF-5, 28.5 m2/ha; LF-10, 32.6 m2/ha) vs. PF (45.8 m2/ha) and LF-30 (46.9 m2/ha). Dead wood on the forest floor was significantly higher in LF-10 (75 m3/ha) than in the other treatments.
Seedlings (2 – 9.9 cm dbh) of 802 species belonged to 241 genera and 65 families. There was a high variability in species richness across treatments (89 – 191/ha), but not in stem numbers. The Dipterocarpaceae family was dominant in all treatments, followed by the Euphorbiaceae.
The soils were acidic, low in nutrients and had low to very low fertility. Both primary and logged forest areas are marginal or not suitable for sustained production of plantation crops. Logging caused soil compaction in LF-30.
Although in terms of number of species and trees, amount of BA, number of saplings and seedlings LF-30 appeared to have satisfied prescriptions for a second harvest, ecologically the forest is far from mature.
The Indonesian Selective Cutting and Replanting (TPTI) system may need to be revised to a 35 – 45 year cycle to ensure long-term forest productivity in terms of not only timber but other goods and ecosystem services, the value of which are never quantified in monetary terms, but can be higher than the timber revenue
Kajian Kebijakan Hutan Kota: Studi Kasus di Provinsi Daerah Khusus Ibukota Jakarta (DKI)
No full textWilayah Daerah Khusus Ibukota (DKI) Jakarta merupakan salah satu daerah rawan bencana banjir dengan naiknya tinggi permukaan air laut akibat pemanasan global. Kondisi ini bertambah buruk dengan semakin menyusutnya ruang terbuka hijau (RTH) dari sekitar 35 persen (1965) menjadi sekitar 9,3 persen (2009). Oleh karena itu kajian kebijakan pembangunan hutan kota di DKI Jakarta sanagt diperlukan sebagai proses pembelajaran bagi para pengelola perkotaan di Indonesia. Kajian ini bertujuan untuk mengevaluasi pelaksanaan kebijakan pembangunan hutan kota yang dilakukan oleh pemerintah daerah (Pemda) provinsi DKI Jakarta. Hasil kajian menunjukkan bahwa pembangunan hutan kota merupakan suatu keniscayaan bagi pemda DKI Jakarta untuk mengurangi tingkat kerentanan terhadap bencana banjir dan sekaligus memperindah dan menjaga keasrian lingkungan perkotaan. Sejak keluarnya PP No. 63 Tahun 2002 tentang Hutan Kota dan UU No. 26 Tahun 2007 tentang Tata Ruang, pemda DKI Jakarta belum membuat peraturan-peraturan daerah terkait, tetapi sudah banyak upaya-upaya yang direalisasikan untuk mendukung pembangunan hutan kota melalui peningkatan luas RTH. Pemda DKI Jakarta terus berupaya meningkatkan luasan RTH secara konsisten dengan membongkar 93 bangunan di tepi sungai Kalibaru dan menutup 27 stasiun pengisian bahan bakar untuk umum(SPBU) yang berlokasi di jalur hijau dan mengalihfungsikannya sebagai RTH. Sumber-sumber pendanaan yang yang dapat dikumpulkan oleh Pemda DKI Jakarta untuk membiayai perluasan RTH adalah APBD, APBN, Pajak dan dana CSR dari Perusahan besar nasional dan multi nasional yang berkantor pusat di Jakarta serta lembaga donor Internasional yang peduli lingkungan
STRUKTUR DAN KOMPOSISI HUTAN PAMAH BEKAS TEBANGAN ILEGAL DI KELOMPOK HUTAN SEI LEPAN, SEI SERDANG, TAMAN NASIONAL GUNUNG LEUSER, SUMATERA UTARA
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