1,720,981 research outputs found
An introductory summary. Sustainability of chestnut forest ecosystems : Is it possible ?
No full textAmorini Emilio, Chatziphilippidis Gregor, Ciancio Orazio, Castri Francesco di, Giudici Fulvio, Leonardi Salvatore, Manetti Maria Chiara, Nocentini Suzanna, Pividori Mario, Rapp Maurice, Romane François, Sevrin Eric, Zingg Andreas. An introductory summary. Sustainability of chestnut forest ecosystems : Is it possible ?. In: Ecologia mediterranea, tome 26,2000. pp. 3-14
Seed regeneration of sweet chestnut (Castanea sativa Miller) under different coppicing approaches
Full text linkNatural seed regeneration in chestnut coppices: a key factor in planning silvicultural management.
No full textOver the last 50 years, many unfavourable factors have led to the abandonment of the traditional management of many chestnut
coppices. This generated a general aging of the stands and a related reduction of the slope stability, emphasizing the importance of natural
regeneration for future forest management.
Natural regeneration from seed contributes to the increase of the stem density, provides new stools for future coppice generations and promotes
the proper development of the stand in terms of specific and structural diversity.
In this study we tested the effect of different silvicultural treatments in coppice stands on the seed regeneration potential of the chestnut tree. The
chestnut seed regeneration resulted to be influenced by: I) the age of the stand at felling time (increasing age was related to a greater presence
of regeneration from seed), II) the cover of released over-aged trees (light conditions on the soil), III) microclimatic conditions (drought stress in
particular).
Overall, the natural regeneration dynamics in chestnut coppices revealed to be a useful reference to identify some general guidelines for
sustainable interventions aiming to foster chestnut regeneration, while maintaining biodiversity in an effort to improve the quality of timber
assortments
Nuove linee guida per i cedui di castagno - New silvicultural guidelines for chestnut coppices
No full textThe silvicultural management of chestnut coppices can contribute to the social and economic promotion of mountain and rural marginal areas.
In this note, are described possible technical options for preserving coppice systems and for implementing innovative approaches for producing quality timber. These can be selected in relation to economical frame conditions and objectives, as well as on the bases of environmental constraints (e.g., site conditions, stand structure)
Impact of Climate, Stand Growth Parameters, and Management on Isotopic Composition of Tree Rings in Chestnut Coppices
Full text linkResearch Highlights: Chestnut trees’ (Castanea sativa Mill.) growth and their responses to climate are influenced by stand-characteristics and managements. This study highlighted that chestnut tree-ring growth is not particularly influenced by climate, while minimum temperature showed a positive relation with both intrinsic water-use efficiency (WUEi) and δ¹8O. Background and Objectives: The aim is to check the responses of chestnut trees to climate conditions and the role of stand structure and management. Materials and Methods: Stands with 12–14-year-old shoots were studied using dendrochronological and isotopic (δ18O and δ13C) approaches. Correlations with climate parameters were investigated and principal component analysis was performed using site-characteristics and tree growth parameters as variables. Results: Correlations between tree-ring width (TRW), tree-ring δ18O, and δ13C-derived intrinsic water-use efficiency (WUEi) revealed stand-dependent effects. The highest Correlations were found between climate and tree-rings’ isotopic composition. Chestnut was sensitive to high-minimum temperature in March and April, with a negative relationship with TRW and a positive relationship with WUEi. δ18O signals were not significantly different among stands. Stand thinning had a positive effect on WUEi after 1–2 years. Stand competition (indicated by shoots/stump and stumps/ha) positively influenced both WUEi and δ¹8O
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
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