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Pubblicazioni Scientifiche
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Structural attributes of stand overstory and light under the canopy
Mostra abstract
This paper reviews the literature relating to the relationship between light availability in the understory and the main qualitative and quantitative attributes of stand overstory usually considered in forest management and planning (species composition, density, tree sizes, etc.) as well as their changes as consequences of harvesting. The paper is divided in two sections: the first one reviews studies which investigated the influence of species composition on understory light conditions; the second part examines research on the relationships among stand parameters determined from mensurational field data and the radiation on understory layer. The objective was to highlight which are the most significant stand traits and management features to build more practical models for predicting light regimes in any forest stand and, in more general terms, to support forest managers in planning and designing silvicultural treatments that retain structure in different way in order to meet different objectives.
Multi-taxon and forest structure sampling for identification of indicators and monitoring of old-growth forest
Blasi
,
Carlo
,
Marchetti
,
Marco
,
Chiavetta
,
U.
,
Aleffi
,
Michele
,
Audisio
,
P. Aldo
,
Azzella
,
Mattia Martin
,
Brunialti
,
Giorgio
,
Capotorti
,
Giulia
,
Del Vico
,
Eva
,
Lattanzi
,
Edda
,
Persiani
,
Anna Maria
,
Ravera
,
Sonia
,
Tilia
,
Agnese
,
Burrascano
,
Sabina
structural attributes
multi-taxon species lists
species co-occurrence
structure-based indicators
taxon-based indicators
Mostra abstract
The most commonly used old-growth forest indicators are structural attributes; nevertheless, they do not necessarily represent the biodiversity value of old-growth forests. The aim of this study is to analyse the relationships between species richness data of different taxa and structural indicators of old-growth and to identify taxonomic/functional groups, species and structural attributes that may be used as indicators of old growth. To achieve this goal we sampled forest structure, vascular plants, lichens, bryophytes, fungi, saproxylic beetles and birds in mature and old-growth stands in southern Italy. We calculated Spearman's correlation coefficients between species richness data and structural attributes. Analyses of indicator species, co-occurrences and two-way clusters were performed on the multi-taxonomic list. The group of vascular plants most significantly correlated with other groups in terms of species richness; furthermore, it displays the highest proportion of between-group co-occurrences. The resulting multi-taxonomic list of potential indicators may serve as an effective means of detecting and monitoring forest ecosystems; however, for this goal, structure-based indicators, such as forest structural attributes and vascular plant species composition, are of primary importance. © 2010 Società Botanica Italiana.