Prodromos, Cyprus
Prodromos, Cyprus

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Milios E.,Democritus University of Thrace | Pipinis E.,Aristotle University of Thessaloniki | Petrou P.,Cyprus Forestry College | Akritidou S.,Prefecture of Xanthi | And 2 more authors.
Notulae Botanicae Horti Agrobotanici Cluj-Napoca | Year: 2012

This study was carried out in the central part of Nestos Valley in northeastern Greece. The main objective was to examine the effect of different position (dominant, suppressed, side-shaded) and site productivities on the height growth of young Populus tremula L. clonal ramets in low elevation formations of the species. Fifty-four ramets growing in different positions and sites were cut and studied. Stem analysis was conducted and the height of each ramet at the age of 10 years was calculated. The main results of this research indicate that the dominant ramets on good productivity sites have greater height at the age of 10 years, when compared with the corresponding ramets on medium productivity sites. On the contrary, in suppressed and side-shaded ramets, there is no statistically significant difference in height at the age of 10 years between the two site types. This pattern indicates that competition is the procedure that characterizes the relationships between ramets in the investigated formations. The heights of dominant P. tremula ramets presented in this study are very satisfactory for the species, compared with the height of P. tremula trees from other regions of the species expansion reported in other studies.


Milios E.,Democritus University of Thrace | Petrou P.,Cyprus Forestry College | Andreou E.,Democritus University of Thrace | Pipinis E.,Aristotle University of Thessaloniki
Journal of Biological Research | Year: 2011

The present study was conducted in four locations in Cyprus. These areas are included in a broad study area of approximately 6200 ha. The majority of this area belongs to the Natura 2000 Network and a small part of this area is a designated Nature Reserve. In order to determine whether facilitation is the dominant process in the regeneration of the Juniperus excelsa M. Bieb. Stands in Cyprus, 120 plots of 100 m2 (10 m x 10 m) were established in eight site types. In each plot the regeneration plants were graded in categories, according to their location in relation to J. excelsa trees. In four of the eight site types, that were distinguished, the density of the J. excelsa seedlings in open areas was higher than the density of the regeneration plants that have been established under the facilitation of adult trees of the species. In the remaining site types, a statistically significant difference was not recorded. In Cyprus facilitation is not the dominant process in the regeneration of J. excelsa. On the contrary, it seems that in many cases competition is the dominant force that determines the regeneration process of the species. The J. excelsa formations exhibit adequate recruitment, but in the future, the presence of J. excelsa in Cyprus will gradually be reduced in better sites, since it will be replaced by more competitive species having greater site sensitivity.


Petrou P.,Cyprus Forestry College | Milios E.,Democritus University of Thrace
Plant Biosystems | Year: 2012

The present study was carried out in abandoned fields in central Cyprus. The main objective was to examine the impact of the regeneration environment on the establishment and survival of Pinus brutia seedlings. Sixty-four permanent plots of 16 m2 were randomly established in two distinct sites. Four regeneration environments were recorded: (a) bare soil under the crown of a P. brutia tree, (b) soil under the canopy of a P. brutia tree and low shrubs, (c) bare soil in open areas, and (d) soil under the canopy of low shrubs in open areas. All P. brutia seedlings were classified in categories according to their regeneration environment. In all plots, the density of the P. brutia seedlings was measured in three different seasons (spring, summer, autumn). Soil temperatures were recorded, samples of surface soil were taken and the percentage of soil organic matter was measured. The main conclusions drawn from this research were the following: (1) the mature P. brutia trees and low shrubs facilitate the establishment and especially the survival of P. brutia seedlings, as all seedlings in bare vegetation ground had died by the end of the growing season, and (2) the importance of facilitation increases as abiotic stress rises. © 2012 Copyright Taylor and Francis Group, LLC.


Kitikidou K.,Democritus University of Thrace | Petrou P.,Cyprus Forestry College | Milios E.,Democritus University of Thrace
Renewable and Sustainable Energy Reviews | Year: 2012

A dominant height growth model and a site index model were developed for Calabrian pine (Pinus brutia Ten.) in central Cyprus. Data from 64 stem analysis in 32 temporary plots, where Calabrian pine was the only tree species, were used for modeling. The plots were selected randomly in proportion to two site types. Four difference equations were tested. The evaluation criteria included qualitative and quantitative examinations and a testing with split data. The difference equation of Korf showed the best results for all data. An analysis of the height growth patterns among sites - as these were defined from the selected equation - was made in order to study the behavior of different site index curves. Results indicated the validity of a common height growth model for the two sites. In spite of the irregular height growth pattern observed in Calabrian pine, the model obtained allows us to classify and compare correctly Calabrian pine stands growing at different sites. © 2011 Elsevier Ltd. All rights reserved.

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