1,720,957 research outputs found
Gozdna združba smreke in gozdne bekice v slovenskih Vzhodnih Alpah (Lazulo silvaticae - Piceetum Wraber, 1953) = Die Waldgesellschaft der Fichte und der Waldhainsimse in den slowenischen Ostalpen
No full textUna nuova Pecceta nella zona di transizione tra le Alpi Orientali e Dinariche
Full text linkNova zajednica jele i smreke, Abieti-Piceetum, pojavljuje se na prelaznom području između Jugoistočnih Alpi i Dinarskog gorja i predstavlja u fitogeografskom pogledu kariku u lancu jelovo-smrekovih asocijacija zapadnog (Piceetum subalpinum, Adenostylo-Piceetum) i istočnog dijela tog područja (Neckero-Abietetum, Calamagrosti-Abietetum). Nije još riješeno pitanje da li ta nova asocijacija smreke i jele pripada svezi Vaccinio-Piceion ili svezi Abieti-Calamagrostion, ali je, međutim, njezina pripadnost redu Vaccinio-Piceetalia neprijeporna.
Zajednica Abieti-Piceetum je u prvom redu reljefno i edafski uvjetovana, tek na drugom mjestu odlučuju mikroklimatske prilike. Ta specijalizirana zajednica zauzima nadmorske visine iznad 1200/1250 m, gdje obrašćuje stjenovite vrhove, grebene i strme padine od kompaktnog jurskog vapnenca, najviše u sunčanim položajima. Usred klimatogenih zajednica sveze Fagion illyricum čini Abieti-Piceetum crnogorične oaze, koje po svojoj boji i fizionomiji oštro odstupaju od okolne vegetacije.
U florističkom pogledu asocijacija Abieti-Piceetum prilično je bogata vrstama, jer iz okolne vegetacije bukovo-jelovih šuma ulaze u njezin sastav mnogi elementi i davaju joj donekle fagetalan značaj. Privremene lokalne karakteristične vrste ove asocijacije jesu: Picea excelsa i Abies alba (obje shvaćene kao ekotipovi), Salix appendiculata, Clematis alpina, Rosa pendu- lina, Lonicera nigra i Valeriana tripteris. Veći broj diferencijalnih vrsta omogućava da se asocijacija Abieti-Piceetum lakše razlikuje od zajednica sveze Fagion illyricum.Die neue Tannen-Fichtenwaldgesellsehaft, das Abieti-Piceetum, kommt im Übergangsgebiet von den Südostalpen zum Dinarischen Gebirge vor und stellt in pflanzengeographischer Hinsicht ein Bindeglied im gleitenden Gefälle der Fichtenassoziationen zwischen den Ostalpen (Piceetum subalpinum und Adenostylo-Piceetum) und den Westdinariden (Neckero-Abietetum, Calamagrosti-Abietetum) dar. Es bleibt die Frage offen, ob die neubeschriebene Fichtenwaldgesellschaft dem Vaccinio-Piceion- oder dem Abieti-Calamagrostion-Verband anzuschliessem ist.
Das Abieti-Piceetum ist in erster Linie eine relief- und bodenbedingte und an zweiter Stelle eine lokalklimatisch gebundene Spezialistengesellschaft, welche Höhenlagen über 1200/1250 m einnimmt, felsige Vorsprünge, Gipfel, Steilhänge und Blockhalden aus kompaktem Jurakalkstein bewächst und vorwiegend in sonnigen Lagen vorkommt. Es bildet Nadelwald - Oasen im Klimaxbereich der Fagion illyricum-Gesellschaften, wo es durch seine schroffe Physiognomie stark absticht.
Floristisch ist das Abieti-Piceetum verhältnismässig reich, da aus der ringsumgebenden Buchen-Tannenwaldvegetation viele Elemente in dasselbe hineindringen und ihm eine leicht fagetale Tönung verleihen. Als provisorische holde Charakterararten gelten: Picea excelsa und Abies alba (beide als Oekotypen aufgefasst), Salix appendiculata, Clematis alpina, Rosa pendulina, Lonicera nigra und Valeriana tripteris. Dazu lässt eine grössere Anzahl von Trennarten das Abieti-Piceetum von den Gesellschaften des Fagion illyricum- Verbandes schärfer unterscheiden.La nuova associazione d’abete bianco e peccio, l’Abieti-Piceetum, si presenta nella zona di transizione dalle Alpi Sud-Orientali alle Alpi Dinariche, e rappresenta il termine di congiunzione fra la Pecceta delle Alpi Orientali (Piceetum subalpinum ed Adenostylo-Piceetum) e quella della Dinaridi Occidental! (Neckero-Abietetum e Calamagrosti-Abietetum), nel progressivo trasformarsi della vegetazione. Resta aperto il problema se quest’associazione vada inclusa nel Vaccinio-Piceion o non piuttosto nell'Abieti-Calamagrostidion.
L’Abieti-Piceetum è strettamente legato alle condizioni del rilievo e del suolo ed in seconda linea ad un particolare microclima; si presenta sopra 1200—1250 m d’altitudine su affioramenti rocciosi, cime, pendii e macereti, derivanti da calcare giurassico compatto; preferisce esposizioni soleggiate, esso forma delle oasi di bosco aghifoglio nella fascia-climax delle associazioni del Fagion illyricum, dalle quali si distingue fortemente per la sua peculiare fisionomía.
Floristicamente VAbieti-Piceetum è abbastanza ricco, poichè molti elementi della vegetazione delle faggete ed abetine circostanti penetrano in esso. Come specie csratteristiche provvisorie abbiamo: Picea excelsa, Abies alba (entrambi considerati come ecotipi), Salix appendiculata, Clematis alpina, Rosa pendulina, Lonicera nigra e Valeriana tripteris. Sono inoltre presentí numeróse specie differenziali rirpetto alie associazioni del Fagion illyricum
Acidofilne borove šume u slovensko-panonskom rubnom području
Full text linkDer Verf. behandelt die Rotföhren-Vegetation des slowenischen pannonischen Randgebietes. Auf Grund eines interessanten Vegetationsgefälles, das sich vom subozeanisch getönten Klima am westlichen Rande gegen den Ostrand mit stärkerem subkontinentalem klimatischem Einfluss feststellen lässt, scheidet er eine östliche geographische Variante des bereits beschriebenen Myrtillo-Pinetum austroalpium Tomaz. 1942 als Myrtillo-Pinetum subpannonicum M. Wrab. 1961 aus. Die Übergangszone zwischen beiden Rotföhren-Assoziationen liegt im Hügelgebiet von Slovenske gorice (Windische Büheln). Zusätzlich wird noch eine bodenbedingte Rotföhren-Dauergesellschaft besprochen, nämlich das Molinio altissimae-Pinetum M. Wrab. 1960 auf pseudovergleyten, stark wechselfeuchten Terrassenböden.Autor raspravlja o običnom boru (Pinus silvestris) i njegovim acido- filnim zajednicama u slovensko-panonskom rubnom području uz austrijsko-mađarsku granicu. Prvobitnu vegetaciju toga područja predstavlja po mišljenju autora klimatozonalna šuma hrasta i graba (Querco-Carpinetum s. latiss.), iako u današnje vrijeme u području s obje strane Mure (Slovenske gorice i Goričke) prevladava obični bor (Pinus silvestris), bilo u čistim sastojima bilo kao obilna primjesa u listopadnim šumama.
Palinološki je dokazano da je obični bor u kasnom glacijalu i ranom postglacijalu bio najraširenije šumsko drvo u čitavom ovom području, ali su ga kasnije, kad su nastupile povoljnije klimatske prilike, potisnule listopadne vrste (bukva, obični grab, hrastovi). Međutim, pod utjecajem čovjekova gospodarenja povezanog s jakom degradacijom tla bor se ponovno počeo širiti, tako da u današnje doba daje izraziti fizionomski pečat brežuljkastom panonskom području. Prema tome, borove sastojine toga područja mahom nisu autohtone i ne čine klimatozonalnu vegetaciju kao- što misle neki mađarski autori (T. Pocs, R. Soo i dr.), nego su sekundarnog, antropogenog porijekla.
Idući od jugoistočnog ruba Alpi prema Panonskoj nizini, vidi se postepeno mijenjanje vegetacije borovih šuma, što je u vezi s postepenim prijelazom suboceanske u subkontinen.talnu klimu. Ovaj priielaz ispoliava se u sve rieđem pojavljivanju i postepenom izostajaniu mnogih alpskih i dealpskih bilinih vrsta, te u sve češćoj nazočnosti eurazijsko-kontinentalnih (borealnih) vrsta.
Na osnovu toga autor postavlia jednu novu subpanonsku zajednicu borove šume (Myrtillo-Pinetum subpannonicum). koia se floristički i ekološki dosta jasno razlikuie od već poznate južnoalpske borove zaiednice (Myrtillo-Pinetum austroalpinum) slovenskog predalposkog područja. Prelazna zona između tih dviju borovih asociiaciia dosta je široka, a nalazi se negdje u brežuljkastom području Slovenskih gorica.
Osim asocijaciie Myrtillo-Pinetum subopannonicum autor opisuje još jednu novu zajednicu bora (Molinio altissimae-Pinetum) koja je edafski uvjetovana i prostorno ograničena, a nastava terase sa pseudoglejnim tlo
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
- …
