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Kemajuan Fungsi Lanskap Lahan Pascatambang Galian-C di Citeureup Jawa Barat.
No full textSistem tambang terbuka pada bahan baku semen dapat menyebabkan lahan marginal. Penambangan tersebut menyebabkan lahan tanpa top soil, erosi, peningkatan zat toksik, dan berbagai macam pencemaran lainnya harus segera diatasi agar kembali terciptanya keseimbangan ekosistem. Produktivitas sebuah lahan kritis akibat penambangan bahan baku semen harus diperbaiki terlebih dahulu kondisi lanskapnya dengan mengetahui kemajuan alami fungsi lanskap lahan tersebut. Metode analisis fungsi lanskap menghasilkan tiga indeks yaitu stabilitas lahan, infiltrasi air, dan siklus nutrisi. Penelitian ini bertujuan mengetahui kemajuan fungsi lanskap pada beberapa zona reklamasi pascatambang di Citeureup Jawa Barat berdasarkan umur reklamasi. Metode penelitian yang dilakukan adalah (1) penentuan lokasi penelitian, (2) pengukuran mikroklimat, (3) Pengukuran karakteristik tanah, (4) Analisis fungsi lanskap. Stabilitas lahan pada zona reklamasi 2, 9, 14 tahun serta zona pembanding berturut turut : 46.95 ; 54.65 ; 50.55 dan 57.70% . Infiltrasi air pada zona reklamasi 2, 9, 14 tahun dan zona pembanding berturut turut : 29,70 ; 30.00 ; 35.45 ; dan 36.90%. Siklus nutrisi lahan pada zona reklamasi 2, 9, 14 tahun dan zona pembanding berturut turut : 12.85 ; 24.45 ; 26.00 ; dan 29.55%. Dengan demikian, zona reklamasi di Citeureup Jawa Barat sudah menunjukkan kemajuan fungsi lanskapnya
Komposisi Vegetasi Pada Berbagai Tipe Ekosistem Sesuai Peruntukannya.
No full textLeuwiliang merupakan daerah yang masih memiliki banyak lahan yang berpotensi untuk dibuka menjadi lahan agrowisata, wisata alam dan agroforestri. Dampak dari alih fungsi lahan erat kaitannya dengan vegetasi yang ada disuatu lahan. Oleh karena itu, sebelum dilakukan pembukaan lahan maka diperlukan penelitian tentang komposisi vegetasi yang berfungsi untuk meningkatkan pengetahuan sehingga mendukung terciptanya kegiatan konservasi. Hutan sekunder, Kebun Angsana, dan Bukit Bintang yang berada di Leuwiliang merupakan lahan yang telah dilakukan alih fungsi lahan. Penelitian ini bertujuan mengidentifikasi komposisi vegetasi pada berbagai tipe ekosistem di Leuwiliang sesuai peruntukannya. Metode penelitian yang dilakukan terdiri atas: penentuan lokasi penelitian, pengukuran mikroklimat, analisis vegetasi, analisis data, dan identifikasi tumbuhan. Hutan sekunder didominasi oleh jenis Schima wallichi pada fase pohon, tiang, dan pancang, fase semai didominasi oleh jenis Scleria levis. Kebun Angsana didominasi jenis Artocarpus integer pada fase pohon, jenis Garcinia mangostana fase tiang, jenis Schima wallichi fase pancang, dan jenis Scleria levis fase semai. Bukit Bintang didominasi jenis Pinus merkusii fase pohon, Acacia mangium pada fase tiang dan pancang, fase semai oleh jenis Axonopus compressus. Indeks keanekaragam dan indeks kekayaan tergolong rendah pada semua fase pertumbuhan di tiga lokasi penelitian. Indeks kemerataan pada Kebun Angsana tergolong tinggi pada semua fase pertumbuhan, Hutan sekunder memiliki nilai indeks kemerataan jenis tergolong tinggi pada fase semai dan pancang, sedangkan pada fase tiang dan pohon tergolong sedang. Bukit Bintang memiliki nilai indeks kemerataan jenis tergolong tinggi pada fase semai, tiang, dan pohon, sedangkan pada fase pancang tergolong renda
Fungsi Lanskap pada Zona Rehabilitasi di Taman Nasional Gunung Ciremai
Get PDFForest rehabilitation on Gunung Ciremai National Park (GCNP) has been carried out since 2008, but it has not yet known the progress of the landscape function of the rehabilitation fields. The progress of landscape function can be evaluated using landscape function analysis method which yields three indexes namely land stability, water infiltration, and land nutrition cycle. This study aims to determine the progress of landscape function in several GCNP rehabilitation zones based on the age of rehabilitation. The research method consist of: (1) determination of research location, (2) microclimate measurement, (3) measurement of soil characteristics, and (4) landscape function analysis (LFA). Land stability in forest and land rehabilitation zones (RHL) were 9, 7, and 5 years old and the natural zones respectively: 57.9%; 54.3%; 48.6%; and 56.1%, respectively. Infiltration in RHL zones aged 9, 7, and 5 years and natural zones respectively: 49%; 39.4%; 31.8%; and 36.2%, respectively. The nutritional cycle in the RHL zone was 9, 7, and 5 years old and the natural zone was 47.9%; 34.6%; 23.4%; and 29.2%. Therefore a rehabilitation zone in GCNP which is seven years or older showed its landscape function has reached even beyond the original landscape function
Thottea tapanuliensis (Aristolochiaceae): A new species from Sumatra, Indonesia
Get PDFThottea tapanuliensis (Aristolochiaceae) is described here based on a plant collected from the west coast of northern Sumatra. This species is only known from type collection and is assigned here as Critically Endangered. Morphological descriptions, photographs, a distribution map, and discussions are provided. A key to all Thottea species in Sumatra is also provided
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
Karakteristik Fisiologis Lumut pada Beberapa Ketinggian di Kawasan Gunung Tangkuban Perahu
Get PDFEnvironmental factors greatly influence the physiological state of moss. Some of the environmental factors that influence the physiological of moss are air temperature, humidity, and light intensity. These three environmental factors will vary at each altitude. This study aims to determine the physiological characteristics of mosses on some altitudes in the area of Mount Tangkuban Perahu (Ratu Crater – Domas Crater track). The method that are used is to measure air temperature, humidity, and light intensity at some altitudes. Subsequently, samples were taken at each altitude, to measured chlorophyll and proline content. Mosses that are used as samples; Campylopus sp., Plagiochila sp., Dicranella sp. The results indicate that the chlorophyll content significantly different at some altitude, with an increasing trend as the decrease altitude. The highest chlorophyll content in Campylopus sp. at altitude of 1,621 meters above sea level, while the lowest chlorophyll content in Plagiochila sp. at altitude of 1,721 meters above sea level. The content of proline did not differ significantly at some altitude, and tend to be more affected by air conditions that correlate with distance of moss habitat with the active crater of Domas, which allegedly can cause physiological stress in the moss.
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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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