scholarly journals Asteretum lanceolati: Xenospontaneous community on wet and riparian habitats

2011 ◽  
pp. 73-92 ◽  
Author(s):  
Dragica Obratov-Petkovic ◽  
Ivana Bjedov ◽  
Dragana Skocajic ◽  
Danijela Djunisijevic-Bojovic ◽  
Matilda Djukic ◽  
...  
Keyword(s):  
Invasive Species ◽  
Electric Conductivity ◽  
Soil Analysis ◽  
Life Forms ◽  
Cichorium Intybus ◽  
Cirsium Arvense ◽  
Calystegia Sepium ◽  
Riparian Habitats ◽  
Floristic Structure

Invasive species Aster lanceolatus grows on moist habitats on the whole territory of Serbia. In Belgrade, this species is recorded with a higher degree of presence at a number of localities. With the aim to investigate the community in which this species is dominant, the wide area of Serbia was researched, and 8 localities on the territory of Belgrade were chosen for the analysis of the community. Floristic structure of the community was determined by the standard Braun-Blanquet method (1964), phytogeographical analysis was performed according to Gajic (1980, 1984), and determination of life forms according to Raunkier (Ellenberg, Mueller-Dombois, 1967). pH soil analysis and electric conductivity (EC) were performed at all investigated localities. It was established that the community dominates the moist habitats of Belgrade. It is composed of 104 species and among them Aster lanceolatus Willd., Cichorium intybus L., Agropyrum repens (L.) Beauv., Calystegia sepium (L.) R. Br., Cirsium arvense (L.) Scop., Symphytum officinale L. and Rumex obtusifolius L. are the most frequent. In relation to life forms, the community has hemicriptophytes character, and in relation to phytogeography Euroasian and Middle Europaean floral elements are dominant, with a high presence of cosmopolitan and adventive floral elements. On the locialities Veliko Ratno ostrvo (island) and Makis, EC values point to the fact that the amount of nutrient in the soil is higher than at other localities.

scholarly journals New data on the ecological peculiarities and the distribution in Bulgaria of the vulnerable habitat F3.1d Balkan-Anatolian submontane genistoid scrub from the European Red List of Habitats

Hacquetia ◽  
2019 ◽  
Vol 18 (2) ◽  
pp. 271-287
Author(s):  
Georgi Kunev ◽  
Rossen Tzonev
Keyword(s):  
Vegetation Type ◽  
Volcanic Rocks ◽  
Habitat Type ◽  
Life Forms ◽  
Plant Life Forms ◽  
Area Of Occupancy ◽  
Floristic Elements ◽  
First Time ◽  
Floristic Structure ◽  
East Mediterranean Region

Abstract The study presents new data on the habitat dominated by the species complex of Genista lydia/G. rumelica in Bulgaria. It is based on 129 phytocoenological relevés and provides information on the chorology, ecology and floristic structure of these communities. This habitat type occupies substrates composed by different volcanic rocks. The floristic structure is very rich in species. The phytogeographical relationships with the East Mediterranean region are considerable, which is proved by the high occurrence of floristic elements with Mediterranean or sub-Mediterranean origin. The plant life-forms analysis demonstrates that the therophytes, geophytes and chamephytes prevail in their floristic structure, which is also typical for the shrub communities in this region. During the field study this vegetation type has been mapped and its total area of occupancy has been calculated. For a first time it is proposed this habitat to be divided into three habitat sub-types due to the established differences in the environmental factors. Some recommendations have been proposed on the conservation management and also complements on the habitat‘s descriptions in EUNIS habitat classification.

XXX.—Thermal and Electric Conductivity

1878 ◽  
Vol 28 (3) ◽  
pp. 717-740 ◽  
Author(s):  
Tait
Keyword(s):  
Thermal Conductivity ◽  
Electric Conductivity ◽  
Marked Effect ◽  
Original Method ◽  
The State ◽  
British Association ◽  
Pure Metals ◽  
The Absolute

The following paper contains the results of an inquiry which has occupied me at intervals for somewhere about ten years. It was carried out in part at the expense of the British Association, and I have already reported results to that body in 1869 and 1871. But these provisional reports referred to very short ranges of temperature only, and the experiments were made with faulty thermometers, for which I had not the corrections which had been carefully determined by Welsh at Kew.The inquiry arose from my desire to extend to other metals the very beautiful and original method which Principal Forbes devised, and which the state of his health prevented him from applying to any substance but iron. Forbes' experiments gave a result so very remarkable, and (as it seemed to me) so theoretically suggestive, that I wished to extend them to other pure metals, and also, in one or two cases at least, to alloys.I believe that Principal Forbes had at least two reasons for undertaking his investigations:—(1.) When he commenced his inquiry, there was no really accurate or trustworthy determination of the absolute conductivity of any body whatever for heat. (2.) FORBES had himself, in 1833 and subsequent years, pointed out a very remarkable analogy between the conducting powers of metals for electricity and for heat, and had shown that these were almost precisely proportional to one another—that is to say, that the list of the average relative conductivities of different metals for electricity differed, from that of their relative conductivities with regard to heat, certainly not more than did the several electric lists furnished by different experimenters, and certainly less than the corresponding thermal lists. Hence it was natural to suppose that temperature might have a marked effect on thermal conductivity, as it was known to have such an effect on electric conductivity.

Oxygenation control of YBa2Cu3O6+z polycrystalline samples via in situ determination of electric conductivity

1992 ◽  
Vol 202 (3-4) ◽  
pp. 401-407 ◽  
Author(s):  
S. Elschner ◽  
W. Becker ◽  
H. Bestgen ◽  
M. Brand
Keyword(s):  
Electric Conductivity

scholarly journals Use of buffer methods to estimate the potential acidity of Mato Grosso soils

2020 ◽  
Vol 44 ◽  
Author(s):  
Marcelo Ribeiro Vilela Prado ◽  
Milton Ferreira de Moraes ◽  
Fabrício Tomaz Ramos ◽  
Carlos Leandro Rodrigues do Santos ◽  
David Vilas Boas de Campos ◽  
...  
Keyword(s):  
Standard Method ◽  
Soil Analysis ◽  
Crop Productivity ◽  
The State ◽  
Buffer Solution ◽  
Mato Grosso ◽  
Santa Maria ◽  
Potential Acidity ◽  
Better Than

ABSTRACT Mato Grosso, with a total area of 903357 km², does not have an official methodology for estimating soil potential acidity (H + Al), and determination of H + Al using the standard method is onerous and time consuming. The objective of this study was to compare estimated values of H + Al determined using the standard calcium acetate method with those obtained using three buffer methods, namely, the Shoemaker, McLean, and Pratt (SMP) buffer, Sikora buffer, and Santa Maria buffer (SMB) methods, with samples of the main classes of cultivated soils in the state of Mato Grosso. A total of 196 soil samples were collected from the arable layer (0-20 cm) in agropastoral and adjacent native systems. Statistical models were obtained and compared with models used by laboratories that are hypothetically inadequate because there is no calibration for soils in the state. After laboratory analyses, the paired H + Al and equilibrium pH values corresponding to the equilibrium of each buffer solution (SMP buffer, SMB, and Sikora buffer) were subjected to nonlinear regression analysis (P < 0.05). The SMB method, which does not release pollutant residues into the environment, was better than the Sikora and SMP methods for replacing the standard method used in state laboratories for soil analysis, that is, H + Al (cm3 c dm-3) = 51.189 -25.70 ln(pHSMB) (R2 = 0.88, P < 0.0001). Thus, if laboratories use uncalibrated equations to estimate soil potential acidity, the recommended limestone correction will be underestimated or overestimated, which may compromise crop productivity in Mato Grosso.

scholarly journals Iva xanthiifolia Nutt. and its communities within Warsaw

2014 ◽  
Vol 56 (1) ◽  
pp. 155-167 ◽  
Author(s):  
Barbara Sudnik-Wójcikowska
Keyword(s):  
Invasive Species ◽  
Plant Communities ◽  
North American ◽  
Deductive Method ◽  
The Town

<em>Iva xanthiifolia</em> Nutt., a north-American therophyte has been recorded in Warsaw only for the last 25-40 years. Here, it occurs as a ruderal epoecophyte. It may be considered as an invasive species in the town as it spreads very quickly. The paper represents the attempt at the determination of the coenological amplitude of <em>Iva xanthiifolia</em> Nutt. It also considers syntaxonomic affiliation of the communities with this species on the grounds of the deductive method of syntaxonomic classification of anthropogenic plant communities.

scholarly journals Control Study of Siret River Quality in Pascani County Area and Estimation of Its Pollution Level

2013 ◽  
Vol 21 (2) ◽  
pp. 119-136 ◽  
Author(s):  
Carmen Zaharia ◽  
Iuliana Radu
Keyword(s):  
Pollution Index ◽  
Life Forms ◽  
Pollution Level ◽  
Stress Effect ◽  
Economic Activities ◽  
Chemical Indicators ◽  
Physical Chemical ◽  
Town Area ◽  
Control Study

Abstract The study presents some authors’ experimental results for determination of some quality indicators (few general, specific and toxic physical-chemical indicators) analyzed at the beginning of summer season (June, 2013), in three control sections of Siret River in Pascani town area (i.e. Lunca-Pascani entrance, 1 km-upstream, and 1 km-downstream of Pascani bridge, respectively). The real pollution status of Siret River in Pascani town area is also estimated by the global pollution index (I* GP), and corresponds to values between 3.215-3.891 indicating ‘an aquatic environment modified by domestic and economic activities alongside the river with generation of stress effect against life forms’.

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