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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
Biodiversity and sustainability in the Bulungan Research Forest, East Kalimantan, Indonesia: the response of plant species to logging
Get PDFThis 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
STRUKTUR TEGAKAN DAN STOK KARBON DI RUANG TERBUKA HIJAU PT TOYOTA MOTOR MANUFACTURING DI SUNTER DAN KARAWANG
Get PDFThe reduction of greenhouse gas emissions can be done by utilizing the presence of trees in urban areas that have an important role as carbon sinks. To find out the potential of tree species in absorbing carbon, research was conducted in the green open space of PT. Toyota Motor Manufacturing Indonesia in Sunter & Karawang. The study was conducted by measuring the diameter and height of trees, as many as 53 species of trees in Sunter and 32 species of trees in Karawang, which were five and four years old on average. The results of the calculation of biomass potential and carbon content of the two locations were dominated by three species, namely sengon buto (Albizia chinensis (Osbeck) Merr.), mahogany (Swietenia macrophylla King.), and angsana (Pterocarpus indicus Willd.), each of 126.27 tons (63.14 tons C is equivalent to 231.71 tons of CO2), 84.45 tons (42.22 tons C is equivalent 154.96 tons CO2), and 84.07 tons or 42.03 tons C is equivalent to 154.26 tons CO2
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
KEANEKARAGAMAN TUMBUHAN DAN KANDUNGAN KARBON DI HUTAN TEMBAWANG ALAK, SINTANG, KALIMANTAN BARAT
Get PDFThe production forest area in West Kalimantan has been fragmented as a result of plantations, industrial forest, mining, and others. This causes the loss of primary forests, leaving secondary forests, shrubberies, and open areas. Fragmented forests affect biodiversity. This study aimed to determine vegetation structure, composition, potential biomass, and carbon content in the secondary forests of Tembawang Alak Forest in West Kalimantan. Research on diversity and carbon content was conducted in the area in March 2020. Plots of one hectare (100x100 m2) were placed randomly in old and young secondary forest areas. Observation in the old secondary forest recorded 109 species of plants belonging to 43 families, trees (diameter >= 10 cm) comprised 103 species and 947 trees. Observation in the young secondary forest recorded 41 plants belonging to 24 families, trees consisted of 30 species and a total of 702 trees. The dominant species in the old secondary forest comprised Combretocarpus rotundatus, Porterandia sp., and Gironniera nervosa. Ilex cymosa, Ptychopyxis sp. and Knema cinerea dominated the young secondary forest. The biomass and carbon content of the old secondary forest stands (diameter >= 10 cm) were 306.54 tons/ha or 144.07 tons C/ha. In contrast, whereas the young secondary forest were 127.31 tons/ha or 59.83 tons C/ha.Kawasan hutan produksi di Kalimantan Barat sebagian telah terfragmentasi akibat dari usaha perkebunan, hutan tanaman industri, pertambangan, dan lain-lain. Hal ini mengakibatkan hilangnya hutan primer dan menyisakan hutan sekunder, semak belukar, dan areal terbuka. Hutan yang terfragmentasi mengakibatkan keanekaragaman terganggu. Penelitian ini bertujuan untuk mengetahui struktur, komposisi vegetasi, potensi biomassa, dan kandungan karbon hutan sekunder di hutan Tembawang Alak, Kalimantan Barat. Penelitian dilakukan pada bulan Maret 2020. Plot penelitian dibuat di hutan sekunder tua dan hutan sekunder muda, berbentuk bujur sangkar ukuran 100x100 m2 (1 ha). Hasil penelitian di hutan sekunder tua tercatat 109 jenis tumbuhan dari 43 suku, pohon berdiameter
>= 10 cm ada 103 jenis, berjumlah 947 pohon. Pada hutan sekunder muda tercatat 41 jenis tumbuhan dari 24 suku, pohon berdiameter >= 10 cm ada 30 jenis, berjumlah 702 pohon. Jenis yang dominan berturut-turut di hutan sekunder tua adalah prepat (Combretocarpus rotundatus), penduk (Porterandia sp.), dan pelai (Gironniera nervosa). Pada hutan sekunder muda jenis yang dominan berturut-turut adalah ubah (Ilex cymosa), medang (Ptychopyxis sp.), dan kumpang (Knema cinerea). Biomassa dan kandungan karbon tegakan hutan sekunder tua yang berdiameter >= 10 cm yaitu sebesar 306,54 ton/ha atau 144,07 ton C/ha, sedangkan pada hutan sekunder muda sebesar 127,31 ton/ha atau 59,83 ton C/ha
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