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  • Articles  (10)
  • Greece
  • Springer  (9)
  • Copernicus  (1)
  • Public Library of Science
  • 2010-2014  (1)
  • 1980-1984  (9)
  • 1925-1929
  • 1
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    Static chamber methane flux measurements in volcanic/geothermal areas: preliminary data from Sousaki and Nisyros (Greece) (2010)
    Copernicus
    Details
    Publication Date: 2017-04-04
    Description: Methane plays an important role in the Earth’s atmospheric chemistry and radiative balance being the second most important greenhouse gas after carbon dioxide. Methane is released to the atmosphere by a wide number of sources, both natural and anthropogenic, with the latter being twice as large as the former (IPCC, 2007). It has recently been established that significant amounts of geological methane, produced within the Earth’s crust, are currently released naturally into the atmosphere (Etiope, 2004). Active or recent volcanic/geothermal areas represent one of these sources of geological methane. But due to the fact that methane flux measurements are laboratory intensive, very few data have been collected until now and the contribution of this source has been generally indirectly estimated (Etiope et al., 2007). The Greek territory is geodynamically very active and has many volcanic and geothermal areas. Here we report on methane flux measurements made at two volcanic/geothermal systems along the South Aegean volcanic arc: Sousaki and Nisyros. The former is an extinct volcanic area of Plio-Pleistocene age hosting nowadays a low enthalpy geothermal field. The latter is a currently quiescent active volcanic system with strong fumarolic activity due to the presence of a high enthalpy geothermal system. Both systems have gas manifestations that emit significant amounts of hydrothermal methane and display important diffuse carbon dioxide emissions from the soils. New data on methane isotopic composition and higher hydrocarbon contents point to an abiogenic origin of the hydrothermal methane in the studied systems. Measured methane flux values range from –48 to 29,000 (38 sites) and from –20 to 1100 mg/mˆ2/d (35 sites) at Sousaki and Nisyros respectively. At Sousaki measurement sites covered almost all the degassing area and the diffuse methane output can be estimated in about 20 t/a from a surface of about 10,000 mˆ2. At Nisyros measurements covered the Stephanos and Kaminakia areas, which represent only a part of the entire degassing area. The two areas show very different methane degassing pattern with latter showing much higher flux values. Methane output can be estimated in about 0.25 t/a from an area of about 30,000 mˆ2 at Stephanos and about 1 t/a from an area of about 20,000 mˆ2 at Kaminakia. The total output from the entire geothermal system of Nisyros probably should not exceed 2 t/a.
    Description: Published
    Description: Vienna, Austria
    Description: 4.5. Studi sul degassamento naturale e sui gas petroliferi
    Description: open
    Keywords: methane output ; diffuse degassing ; volcanic/hydrothermal systems ; Greece ; 01. Atmosphere::01.01. Atmosphere::01.01.03. Pollution ; 01. Atmosphere::01.01. Atmosphere::01.01.07. Volcanic effects ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 05. General::05.02. Data dissemination::05.02.01. Geochemical data ; 05. General::05.08. Risk::05.08.01. Environmental risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 2
    Electronic Resource
    Electronic Resource
    An attempt to measure phosphate potential in the saturation extract of certain Alfisols of Greece (1982)
    Springer
    Plant and soil 69 (1982), S. 301-304 
    Details
    ISSN: 1573-5036
    Keywords: Alfisols ; Electrical conductivity ; Greece ; Mediterranean soils ; Phosphate activity ; Phosphate potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Dihydrogen phosphate ion activity (H2PO4) and phosphate potential were measured in the saturation extracts of 14 representative Red Mediterranean soils (Alfisols) of Greece, estimating the ionic strength from a) measured ionic concentrations b) actual ionic concentrations and c) electrical conductivity measurements. The values of (H2PO4) and phosphate potential thus obtained were correlated with P-uptake by rye-grass in a pot experiment. The correlation coefficients did not differ significantly (p≤0.001) from one another and from those of (H2PO4) and phosphate potential measured in 0.01M CaCl2 extracts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374527
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  • 3
    Electronic Resource
    Electronic Resource
    Periphyton analysis for the evaluation of water quality in running waters of Greece (1980)
    Springer
    Hydrobiologia 74 (1980), S. 39-48 
    Details
    ISSN: 1573-5117
    Keywords: periphyton ; running waters ; blue-green algae ; diatoms ; Cyclotella prostrata ; ecological methods ; pollution ; Greece
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Based on a microfloristic analysis of periphyton, a selected ecological method of evaluating water quality, independent of saprobic systems is applied to a chosen section of running water in the springs of Levadia, Greece. The graphic representation of the results and an estimation of the degree of pollution is given. A simple method for the quantitative evaluation of the biocoenose of epilithic algae is additionally developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00009013
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  • 4
    Electronic Resource
    Electronic Resource
    Periphyton algae and bacteria from springs of Levadia Boeotia, Greece (1981)
    Springer
    Hydrobiologia 80 (1981), S. 67-89 
    Details
    ISSN: 1573-5117
    Keywords: bacteria ; blue-green algae ; diatoms ; systematics ; periphyton ; running waters ; Greece
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Wild and cultured species of periphyton from Levadia springs, Greece were studied. A total of 102 species of algae and bacteria were divided into 4 Bacteriophyta, 32 Cyanophyta and 66 Bacillariophyta. Descriptions and taxonomic comments on all taxa found as well as an account of previous studies on bacteria and algae from running waters in Greece are presented. Eleven diatoms and four blue-green algae are first records for Greece.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00130682
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  • 5
    Electronic Resource
    Electronic Resource
    Total concentrations of Mn, Zn and Cu in certain forest soils in Greece (1983)
    Springer
    Plant and soil 74 (1983), S. 137-140 
    Details
    ISSN: 1573-5036
    Keywords: Copper ; Forest soils ; Greece ; Manganese ; Total concentrations ; Zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Total concentrations of Mn, Zn and Cu were determined in soil samples from 144 profiles located in remote forested areas throughout the mainland of Greece. Bio-accumulation of Mn and Zn in the humic horizon took place only in moderately acid soils (pH 5–6). Mean concentrations of Mn, Zn and Cu, in the mineral section of the soil profiles, were 1383, 93, and 51 ppm, respectively. Soils from hard limestone and basic and ultrabasic igneous rock contain these three minor elements at significantly higher concentrations compared to soils from the rest of the soil parent materials. In most of the soil profiles concentration of Cu increased, and of Mn decreased, with soil depth. Concentrations of Mn, Zn and Cu in the underlaying “rocks” were within the range of their average concentrations found in the mineral soil, except for hard limestone where much lower concentrations of these elements have been found. The latter supports the theory that the parent material of soils associated with limestones might not be a solution product of the limestone rock.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02178750
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  • 6
    Electronic Resource
    Electronic Resource
    Pertilization and nutrition experiments with conifer seedlings in pots (1980)
    Springer
    Plant and soil 55 (1980), S. 269-281 
    Details
    ISSN: 1573-5036
    Keywords: Ammonium-vs nitrate-N ; Conifers ; Fertilization ; Deficiency ; Greece ; Nitrogen ; Nutrition ; Phosphate ; Pinus halepensis ; P. maritima ; P. radiata ; Potassium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In conifer fertilization and nutrition experimentsPinus halepensis, P. radiata andP. maritima seedlings were grown in pots, filled with soil derived from mica schist and siliceous tertiary deposits and also in peat substrate in paperpots. Fertilization with P ofP. radiata andP. maritima seedlings growing in soil low in available P and N improved seedling height only in combination with N fertilization and fertilization with alone induced P deficiency symptoms. N fertilization with from 100 to 150 ppm (2.4 to 3.2 g N/kg, respectively) in the soil regardless of the form of N (NH4 + or NO3 −) applied in the summer or autumn together with application of 20 ppm P before sowing was the fertilization regime which produced the best seedlings. Fertilization of peat before sowingP. halepensis, P. radiata andP. maritima with omission of one of the nutrients N, P and K resulted in visible symptoms of N, P and K deficiency, respectively, in the seedlings. Comparative chemical analysis of needles from the three kinds of conifer seedlings with deficiency symptoms and healthy ones verified the visual symptoms of N and P deficiency but not so convincingly the K deficiency symptoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181807
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  • 7
    Electronic Resource
    Electronic Resource
    Relationships of bio-climatic zones and lithology with various characteristics of forest soils in Greece (1984)
    Springer
    Plant and soil 79 (1984), S. 101-121 
    Details
    ISSN: 1573-5036
    Keywords: Base saturation ; Bio-climatic zones ; Calcium ; Clay accumulation ; Copper ; C:N ratio ; EDTA ; Forest soils ; Greece ; Iron ; Magnesium ; Manganese ; Nitrogen ; Phosphate ; Potassium ; Soil classification ; Zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Soils derived from a number of different parent materials (lithologies) and developed along a climatic gradient, manifested by the altitudinal succession of natural vegetation zones (Mediterranean, sub-Mediterranean, Mountainous and Pseudoalpine), were sampled throughout mainland Greece. In soils derived from siliceous parent materials low in clay, acidity increase and percent base saturation decreases from the Mediterranean to the Pseudoalpine vegetation zones. Clay illuviation is found mainly in soils developed in the Mediterranean and the sub-Mediterranean zones. No such changes are apparent in clayey soils rich in bases. Organic matter content of the mineral portion of the soil profile increases by a factor of 2 with a decrease in mean annual air temperature of about 10°C. The pattern of change in clay and soil organic matter content with climate is in relatively good agreement with soil development trends in the area, when soil profiles are named according to the FAO-Unesco soil map of the world. Concentrations of Ca and Mg decrease and those of total N, total and extractable P, K, Fe, Mn and Zn increase from the Mediterranean to the Mountainous zone. Within the same zone, however, concentrations of N, Ca, K, Fe, Mn and Zn decrease, but those of Mg, total and extractable P increase with soil depth. The concentrations of most macro- and micronutrients in the humic horizon are several times higher than those in the mineral portion of the soil profile due to biological enrichment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182148
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  • 8
    Electronic Resource
    Electronic Resource
    Pollution of soil and vegetation in the Thriasian Plain, Greece (1982)
    Springer
    Plant and soil 66 (1982), S. 271-277 
    Details
    ISSN: 1573-5036
    Keywords: Aleppo pine ; Cadmium ; Chromium ; Greece ; Heavy metals ; Lead ; Manganese ; Nickel ; Pinus halepensis ; Pollution ; Soil ; Sulfate ; Thriasian plain ; Vegetation ; Zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The Thriasian Plain near Athens in Greece is a site of concentrated industrial development. Total concentrations of Pb, Cd and extractable SO4 2− in surface soil samples collected from this area, were found to be, respectively, 2–7, 6–34 and 2–20 times higher than those in similar soil samples from parts of the country remote from industrial activity. Total concentrations of Pb, Cd, Zn, Cr and S in samples of olive leaves from the same area were found to be, respectively, 4–40, 3–10, 3–9, 2–6 and 17–21 times higher than those found in samples of olive leaves from rural sites. Leaves of cabbages growing in the area contained between 0.82 and 40 μg/g (wet weight) of Pb. Addition of Cd, Ni and Cu to a calcareous potted soil at concentrations of 100, 200 and 200 ppm increased the concentrations of the metals in the needles of Aleppo pine (Pinus halepensis) seedlings to 4.5, 3.5 and 10 ppm, respectively, after 7 months growth in the nursey.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02183986
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  • 9
    Electronic Resource
    Electronic Resource
    A phenological study of flowering period and flower colours of aromatic plants in Greece (1984)
    Springer
    Plant ecology 56 (1984), S. 129-137 
    Details
    ISSN: 1573-5052
    Keywords: Flower colour ; Flowering period ; Flowering spectrum ; Greece ; Phenology ; Similarity coefficient (Sørensen)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The flowering period and flower colour spectrum of 170 aromatic plant species are studied in 18 representative regions in Greece. The duration of the early to late flowering of the species is recorded for each region and for Greece as a whole. The basic flower colours (green, yellow, red and violet) are defined and the colour spectra for each region and for the whole country are given by converting absolute to relative values. The Sørensen similarity coefficient is applied to compare regions and the relationship among them as well as with a control region (Athos peninsula). Conclusions are drawn as to the time of maximum flowering and the decrease in the proportion of flowering species from north to south. In addition, interpretations are given for the symmetrical flowering curve of Greece as a whole, compared to the skewed curves of the islands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00045218
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  • 10
    Electronic Resource
    Electronic Resource
    Nitrogen and phosphorus content in plant species of Mediterranean ecosystems in Greece (1984)
    Springer
    Plant ecology 55 (1984), S. 29-35 
    Details
    ISSN: 1573-5052
    Keywords: Greece ; Maquis ; Nutrients ; Phrygana
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The values of nitrogen phosphorus ratios measured in green parts of evergreen sclerophylls, seasonal dimorphic, deciduous and herbaceous plants found in Mediterranean-type ecosystems of Greece, form a homogeneous group, which is comparable only with those of analogous ecosystems of California but not with Mediterranean systems of the southern hemisphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00039978
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