Search results for "site condition"
showing 3 items of 3 documents
Ecological Indicator Values of Europe (EIVE) 1.0: A Powerful Open-Access Tool for Vegetation Scientists
2016
International audience; Background: Ecological indicator values (EIVs) have a long tradition in vegetation ecological research in Europe. EIVs characterise the ecological optimum of species along major environmental gradients using ordinal scales. Calculating mean indicator values per plot is an effective way of bioindication. Following first systems in Russia and Central Europe, about two dozen EIV systems have been published for various parts of Europe.Aims: As there was no EIV system available at European scale that could be used for broad- scale analyses, e.g. in the context of the European Vegetation Archive (EVA), we develop such a system for the first time for the vascular plants of …
Proposal for a parametrization of site conditions in the Mitrakos' indices.
2001
The influence of slope gradient and exposure, of altitude and of distance from the sea on the winter and summer stresses sustained by the Mediterranean vegetation have been parametrized. An example of vegetation changes driven by the variation of any of such environmental factors is reported, and a mathematical formula is proposed to determine a monthly value to add to or subtract from the drought stress and cold stress values, estimated by the Mitrakos' index, in order to better approximate reality. Values obtained in such way can be used in synecology and phytosociology to express in a synthetic-correlative way the ecological valence of plant communities with respect to the main physiogno…
A multifaceted field sampling approach for the management of extremely narrow endemic vascular plant species
2022
Extremely narrow endemic plant species (ENEs) are generally connected with micro- refugia characterized by particular environmental conditions. In-depth knowledge of the ecological requirements of ENEs is fundamental to plan appropriate conservation measures. Using cross-cutting technology, this paper gives a multifaceted approach to collect on-site data on the ecology of ENEs, defines the protocols for a correct sampling design and describes the type of equipment, the time and expenditure needed. Our sampling approach is based on two orthogonal transects, long enough to extrapolate the whole ecological gradient across the area of occupancy of the target species. Microclimatic data are reco…