1,720,956 research outputs found
EFFECT OF DIFFERENT LAND USE ON SOIL ORGANIC MATTER IN BROWN SOILS OF THE EMILIAN APPENNINE.
No full textIn the present study, the organic carbon storage, the organic matter turnover times and the microbial activity in the epipedon (A1 and A2) of soil profiles, formed and evolved over a same parent substrate of sandstones and conglomerate in land stations characterized by different and alternative used of the soil, such as mixed deciduous forest, reforesting area with pinewoods (Pseudotsuga menziesii Franco) and cropping area, were compared. Samples of these last two areas, were collected at depths of 0-5 cm and 5-15 cm.
All the soils, have a pH-range between neutral and alkaline.
The Monte delle Formiche profile (THAPTOEUTRI HAPLIC CAMBISOLS hypereutric; WRB, 2006) under mixed deciduous forest was compared with an adjacent alfalfa (Medicago sativa L.) cultivated soil.
The soil profile of Monte Zena (HAPLIC CAMBISOLS calcaric hypereutric; WRB, 2006) under mixed deciduous forest was compared with an adjacent alfalfa cultivated soil and with a nearly profile under a reforestation area, with a predominance of Douglasia threes.
The contents of Total Organic Carbon (TOC), Total Exctractable Carbon (TEC), of Humic and Fulvic Acids decrease with increasing of the depth of the profile, as common in the brown italian soils. The value of such parameters, is greater in the soils placed under mixed deciduous cover, regarding those placed under coniferous; the lowest equipments are found in the cropping area.
The humification index of forest soil showed a lower degree of humification of the organic matter in the A2 horizons of the epipedon, regarding the A1. The values of the humification index in the samples under conifer and cropped, are approached those typical finds in agricultural soil with monocultivation management. The Microbial Indices, as Microbial Quotient (microbial-C/total-C) and Respiratoty Quotient (qCO2) shown a different situation between the two sites. Forest soil of Monte delle Formiche were caracterised by an high mineralization activity when compared with those sampled under cropping; therefore there is a high fraction of Not-microbial Carbon in the Total Organic Carbon of this soil, respect to alfalfa crop soil. The potentially mineralizable C (Co) of the epipedon under natural mixed forest, is much advanced compared to that one of the cropped. The low Microbial Quotient and the elevated value of the qCO2 indicate that the organo-mineral horizons of the soil under mixed forest still find in a development phase. All the organic and biological parameters of carbon of the soils of the station Monte Zena are low; that can indicate an impoverishment situation of the system, especially in the more disturbed situations as the reforestation and the cultivated soil . In particular, the reforestation site, show in the superficial sample a low values of microbial-C (Cmic), a low Microbial Quotient and an elevating qCO2. The qCO2 increment can be interpreted like an answer of the microbial biomass to the change of the quality of the organic carbon of the residual vegetables
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
POTENTIALLY TOXIC ELEMENTS ALONG SOIL PROFILES IN AN URBAN PARK, AN AGRICULTURAL FARM, AND THE SAN VITALE PINEWOOD (RAVENNA, ITALY)
Get PDFPotentially toxic elements (PTEs) abundances in top soil and along the soil profiles from areas affected by different anthropogenic inputs were investigated.. The study area is located within the Ravenna Municipality, a complex territorial system highly affected by industrial (a large petrolchemical complex) agricultural activities. Three zones with distinct environmental features were identified: the San Vitale Pinewood affected by atmospheric deposition pollutans from the industrial complex (PW1, PW4, PW6 and PW8 soil profiles); a public garden within the Ravenna city center, mainly affected by traffic pollution (GP1 soil profile); the "Luigi Perdisa" farm located immediately northwards Ravenna was selected due to the use of fertilizers as well as atmospheric deposition (PER2 soil profile). The total concentration of PTEs (Ba, Cr, Cu, Cr, Ni, Pb, Zn) was determined by X ray fluorescence spectrometry (XRF), and the pseudo-total concentration with aqua regia digestion (AR) and ICP-OES quantification in order to evaluate the extractability of the elements. Results showed a significant increase of some PTEs (Cu, Pb, Zn) in the top soil compared to the pedological substrate. In the Ravenna urban park (GP1 station), Pb and Zn concentrations exceeded the threshold values established by current Italian laws for soils from "public, residential and private areas" (D. Lgs 152/2006). The correlation between top soil and the subsoil highlighted that some PTEs, such as Cu, Pb and Zn, are anthropogenic and they are mainly associated to the deposition of airborne pollutants, whereas other elements (Cr and Ni) are lithologenic
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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