Search results for "forestry"
showing 10 items of 1998 documents
Toxic impact of the de-icing material to street greenery in Riga, Latvia
2008
Abstract There is little information on the ecological composition of snow on roads as well as the toxic effect of de-icing salt on the ecological status of the street trees ( Tilia x vulgaris H.) in Latvia. Tilia x vulgaris is one of the most widespread tree species of street greenery in the boreo-nemoral zone – in Central, Northern and Eastern Europe. This investigation was done to find out the accumulation of de-icing salt (main elements – sodium and chlorine) in the snow–soil–plant system of street greenery in the central part of Riga (2004–2005), in order to reveal the toxic effect on the ecological status of the street trees ( Tilia x vulgaris ). Snow, soil and leaf samples were colle…
Chlorophyll content mapping of urban vegetation in the city of Valencia based on the hyperspectral NAOC index
2014
Abstract: Spatially distributed chlorophyll content of urban vegetation provides an important indicator of a plant's health status, which might depend on the habitat quality of the specific urban environment. Recent advances in optical remote sensing led to improved methodologies to monitor vegetation properties. The hyperspectral index NAOC (Normalized Area Over reflectance Curve) is one of these new tools that can be used for mapping chlorophyll content. In this paper we present the work done to quantify vegetation chlorophyll content over the city of Valencia (Spain) based on chlorophyll measurements of four representative tree species: the London plane tree (Platanus x. acerifolia), the…
A study of chemical characteristics of soil in relation to street trees status in Riga (Latvia)
2013
Abstract The chemical composition of soil and appropriate supply of nutrients are very important factors for normal plant growth and development. Lime tree ( Tilia x vulgaris H.), is a popular tree species used for urban landscaping in Europe. However, there is little information on the chemical element concentrations available to and recommended for T. x vulgaris in urban soils. The objectives of this study were: (1) to investigate the amount of nutrients, de-icing salts and heavy metals available for uptake by trees in the city centre on a seasonal scale; and (2) to assess the relationship between the vitality of T. x vulgaris and soil chemistry. The research was carried out in five stree…
Distribution, ecology and conservation survey on theCeltis tournefortiisubsp.aetnensis(Celtidaceae: Cannabaceae) populations in Sicily
2014
Results of research on the Celtis tournefortii subsp. aetnensis (Celtidaceae-Cannabaceae) populations in Sicily, based on the monitoring of the various nuclei distributed in the territory, are presented. In particular, two new important unpublished stations located in the southern part of the Sicani Mountains, widespread over an area of approximately 75 hectares, are reported. It is highlighted that the species, besides the lava flows of the western slope of Mount Etna (Catania province), is tied to conoids present in five other disjointed sub-ranges, often with fragmentary and relictual stations: (1) Nebrodi Mountains inland (Cesarò territory, Messina province); (2) Madonie Mountains inlan…
Climate-tree-growth relationships of Scots pine stands (Pinus sylvestris L.) exposed to soil dryness
1998
Dendroclimatological techniques were used to assess the impact of climatic factors on radial tree growth (total ring-width and latewood-width) of stunted Scots pine trees (Pinus sylvestris L.) exposed to soil dryness and nutrient deficiency on a dolomite substrate. The response of eight scattered populations representing various habitats, yet influenced by the same regional climate was investigated. Total ring-width and latewood-width were dated, standardized and several chronology statistics, which estimate the chronology signal strength and the potential climate signal in the series, were determined. Dendroclimatic analysis comprised evaluation of event/pointer years as well as response f…
New national and regional Annex I Habitat records: from #37 to #44
2022
In this contribution, Italian new data concerning the distribution of the Annex I Habitats 3150, 3170*, 3260, 4090, 91L0, 91M0, 9340 are reported. In detail, 20 new occurrences in Natura 2000 sites are presented and 30 new cells are added in the EEA 10 km × 10 km reference grid. The new data refer to the Italian administrative regions of Campania, Lazio, Sardinia, Sicily, Tuscany, and Umbria.
‘Back to the Future’—Oak wood-pasture for wildfire prevention in the Mediterranean
2021
In the summer of 2021, enormous wildfires in the Mediterranean eliminated huge areas of mainly coniferous forest, destroyed adjacent settlements and claimed the lives of many people. The fires indicate effects of climate change and expose consequences of rural demographic changes, deficits in regional and touristic development planning and shortcomings in forest policy. This forum article highlights the dimensions of the problem, calls for a paradigm shift and shows solutions. Land abandonment, woody plant encroachment and non-reflective afforestation are leading to increasing amounts of combustible biomass. To prevent disastrous fires in future, fundamental changes in tree species composit…
Small Mammals in Forests of Romania: Habitat Type Use and Additive Diversity Partitioning
2021
Small mammals are key components of forest ecosystems, playing vital roles for numerous groups of forest organisms: they exert bottom-up and top-down regulatory effects on vertebrate and invertebrate populations, respectively
Emulating natural disturbances in boreal Norway spruce forests: Effects on ground beetles (Coleoptera, Carabidae)
2014
The disturbance regime of boreal forests has been substantially altered by human influence in northern Europe. In this context, emulations of natural disturbance have become increasingly common as management tools to minimize negative effects of forestry on biodiversity. In a large-scale habitat-restoration experiment conducted in Norway spruce stands in southern Finland, we tested the effects of controlled burning, partial harvesting, and increasing the amount of downed wood on ground beetles (carabids). We also evaluated the effects of moisture gradients within harvested sites. We collected beetles seven years after the treatments. The moisture gradient was the strongest determinant of ca…
PROFITABILITY OF SMALL LOQUAT FARMS IN SICILY
2015
The northern Sicilian coastline, known for its favorable soil and climatic conditions, represents the main production area in Italy for loquat (Eriobotrya japonica Lindl.). Over the years, the absence of process innovation and appropriate marketing strategies caused a gradual decline of loquat cultivation. This study estimates the profitability of some representative Sicilian farms that grow loquat in the area of Trabia (Palermo Province), where this crop is important for the local economy. The results highlighted a productive scenario characterized by high production costs, where only a family farm that supplies much of its own labor can survive.