1,720,978 research outputs found
Potential Carbon Stocks of Mangrove Forest and Oil Palm in Pulau Sembilan, North Sumatra
No full textIndonesia is an archipelagic nation who has among world’s greatest natural
resources and the biodiversity, one of which is coastal mangrove forest. One of
mangrove forests functions is natural carbon sinks, with this function allows
mangrove forests to store large amounts of organic carbon, through the form of
vegetation (biomass) and soil organic matter. This research was conducted to
better understand the ecological and social benefits of mangrove functions as
carbon sinks, and develop strategies for mangrove conservation to maximize their
potential benefits, especially mangrove forests in Pulau Sembilan Village,
Pangkalan Susu sub-district, Langkat Regency, North Sumatra. There were 11
mangrove species encountered in natural mangrove forests as well as in restored
mangrove forests across sampling areas. Non-destructive vegetation and oraganic
matter sampling was completed by establishing six circular plots with a radius of 7
m across 125 m transect perpendicular to estuary water body. The assessed carbon
stock consists of three components of the carbon pool, namely tree biomass, root
biomass and dead wood. The average total carbon stock in natural mangrove
forests was 228 MgC/ha, restored mangrove forests was 116 MgC/ha, logged
mangrove was 69 MgC/ha and oil palm plantations was 18 MgC/ha.35 PagesSkripsi Sarjan
Potensi Stok Karbon Hutan Mangrove dan Tutupan Lahan Lainnya di Lubuk Kertang, Sumatera Utara
No full textHutan mangrove adalah salah satu jenis hutan penyerap karbon alami jangka panjang
yang paling produktif dan efisien. Mangrove memiliki kandungan stok karbon
organik berkisar tiga sampai lima kali lebih banyak dibandingkan jenis hutan lain
di tanah mineral dan daratan tinggi. Penelitian ini bertujuan untuk mengukur dan
membandingkan total stok karbon hutan mangrove dan hutan mangrove yang telah
terkonversi menjadi tutupan lahan lainnya di desa Lubuk Kertang, Sumatera utara.
Stok karbon yang diukur terdiri dari tiga komponen karbon pool, yaitu biomass
pohon, biomassa akar, dan kayu mati atau serasah. Sebanyak tiga transek
pengukuran dengan masing-masing 6 plot lingkaran digunakan dalam pengambilan
data di setiap tutupan lahan, kecuali pada tutupan lahan perkebunan kelapa hanya
terdapat satu transek. Di semua plot, tegakan hidup dan mati diukur diameter, tinggi
serta jenis speciesnya. Stok karbon biomassa dihitung dengan menggunakan
metode non-destruktif, yaitu dengan menggunakan persamaan alometrik. Total
rataan stok karbon pada hutan mangrove alami sebesar 158 MgC/ha, hutan
mangrove restorasi sebesar 84 MgC/ha, dan mangrove yang telah ditebang sebesar
46 MgC/ha. Total rataan stok karbon tutupan lahan yang telah terkonversi menjadi
lahan perkebunan kelapa sebesar 19 MgC/ha dan perkebunan kelapa sawit sebesar
140 MgC/ha.Mangrove forest is one of the most productive and efficient long-term natural
carbon sink ecosystems. This coastal wetland stores between three and five times
more organic carbon stocks than uplandforests. This study aims to measure and
compare the total carbon stocks, which includes three main carbon pools, namely
tree biomass, root biomass, and dead wood or litter across mangrove forests and
other land uses in Lubuk Kertang village, North Sumatra. A total of five (5) land
covers were studied, and three transects, except for plantation land cover there is
only one transect, with 6 of 7 m circular plots were developed. All living trees and
dead wood in side all plots were assessed for their diameter, height and species
name. Carbon stocks data were subsequently estimated by using species specific
allometric equations. The total average carbon stocks in natural mangrove forests
are 158 MgC/ha, in restorated forests are 84 MgC/ha, and in logged forests are 46
MgC/ha. The total average carbon stocks at converted mangrove to coconut
plantation are 19 MgC/ha and oil palm plantation are 140 MgC/ha.38 HalamanSkripsi Sarjan
Organic carbon burial and sources in soils of coastal mudflat and mangrove ecosystems
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Full text linkWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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