Comparison of plant cover of river valley fragments by using GIS tools and multivariate analysis

2017 ◽  
Author(s):  
Barbara Waldon-Rudzionek
Keyword(s):  
Multivariate Analysis ◽  
Plant Cover ◽  
River Valley ◽  
Gis Tools

Marshland vegetation of the class Phragmito-Magnocaricetea in northwest Croatia (Krapina river valley)

Biologia ◽  
2010 ◽  
Vol 65 (1) ◽  
Author(s):  
Zvjezdana Stančić
Keyword(s):  
Plant Cover ◽  
Ecological Factors ◽  
Nutrient Content ◽  
Field Work ◽  
Life Forms ◽  
River Valley ◽  
Soil Reaction ◽  
Alien Plant ◽  
Invasive Alien Plant ◽  
Plant Life Forms

AbstractMarshland vegetation of the class Phragmito-Magnocaricetea in the Krapina river valley was investigated during 2006 and 2007, and some sporadic investigations were made earlier. Phytosociological studies were carried out in accordance with the standard Braun-Blanquet methodology. As a result of the field work, and a small amount of data from the literature, 120 relevés were collected and 18 communities were established. For the purposes of comparison, the relevés were also classified using numerical methods. The clusters obtained mostly correspond to specific associations, but do not confirm the division into traditional vegetation alliances and orders. In the analysis of the ecological factors it is established that separation of the relevés is influenced by nutrient content, soil reaction, soil moisture, depth of water, and type of management. Analysis of the plant life forms shows, in all marshland communities, a prevalence of hemicryptophytes, geophytes and hydrophytes. The most widespread marshland communities of the investigated area are: Phalaridetum arundinaceae, Phragmitetum australis and Galio palustris-Caricetum ripariae. Furthermore, Carex randalpina community is recorded for the first time in Croatia. The most threatened marshland communities could be considered to be: Carex randalpina community, Caricetum vesicariae, Leersietum oryzoidis and Oenantho-Rorippetum. They are selected because of their very small surfaces in the investigated area and the small number of known localities within the territory of Croatia. The most invasive alien plant species in the Krapina river valley is Solidago gigantea. It spreads in potential habitats of marshland vegetation, and it is recorded in the species composition of many marshland communities. For the preservation of marshland vegetation, and especially threatened types, it is necessary to maintain the water regime of the habitats, to not remove natural plant cover due to spreading of neophytes, and to provide occasional mowing and burning.

scholarly journals Plant cover of the Szum river valley (Roztocze, South-East Poland)

2011 ◽  
Vol 74 (1) ◽  
pp. 43-51 ◽  
Author(s):  
Bożena Czarnecka
Keyword(s):  
Plant Cover ◽  
Regional Scale ◽  
River Valley ◽  
Forest Communities ◽  
Vascular Flora ◽  
Se Poland ◽  
Plant Associations ◽  
Left Tributary ◽  
Phytosociological Relevés ◽  
Data Book

The break section of the Szum river and the mouth part of its left tributary, Miedzianka (Roztocze, SE Poland) were the object of the research conducted in the years 1999-2001. The aim of the study was to establish the abiotic conditions of the diversity of vegetation and the richness of vascular flora in a small lowland river valley. A real vegetation map was drawn in the scale 1:5000. The syntaxonomic classification of plant communities and habitat trophism were established on the basis of 120 phytosociological relevés and 160 soil samples, respectively. On the area of barely 35.4 ha identified were 48 plant associations and communities representing 11 phytosociological classes, among them habitats protected in Poland (16 types) and important at the EU scale (3). There were found 378 species of 72 families, including: 21 species under strict protection, 9 under partial protection, 25 plants threatened on the regional scale, and 2 included into the Polish Red Data Book. Most of interesting species and non-forest communities occur in the parts of the valley above and below a landscape reserve 'Szum', established in 1958, covering presently 18.17 ha. The greatest floral richness was found in the peatbog-meadow complexes (<em>Phragmitetea</em>, <em>Molinio-Arrhenatheretea</em>, <em>Scheuchzerio-Caricetea</em>), in bog-alder forests and willow bushes (<em>Alnetea glutinosae</em>), and streamline ash-alder carrs (<em>Querco-Fagetea</em>, <em>Alno-Ulmion</em>), while the smallest - in the pine and poorer upland mixed fir forests (<em>Vaccinio-Piceetea</em>). Vascular flora appears to be the richest in the sections of the valley where the bottom is overgrown by non-forest communities. The results of the study indicate that it is necessary to enlarge the area of the existing nature reserve.

The vegetation of steppe and forest-steppe belts of the Central Altai

2013 ◽  
pp. 9-35
Author(s):  
N. I. Makunina
Keyword(s):  
Plant Cover ◽  
River Valley ◽  
Forest Steppe ◽  
Forest Communities ◽  
The West ◽  
Central Altai ◽  
The North ◽  
Steppe Belt ◽  
River Valleys ◽  
Steep Slopes

Steppe and forest-steppe belts in Central Altai occupy the bottoms of inter-mountain basins, expanded river valleys and surrounding mountains. The studied 4 steppe sites give sublatitudinal discontinuous range. The Kanskaya basin is rounded, the Ursulskaya one and the Chuya river (lower reaches) valleys are elongated from the east to the west while the steppe site of the Katun river valley — from the south to the north. The Kanskaya basin has a rounded shape while the Ursulskaya basin and the Chuya river valley (lower reaches) are elongated in the latitudinal direction, the steppe site of the Katun river valley — in longitudinal one. The configuration of the surrounding mountains is different: Kanskaya basin is surrounded by gradual mountain ridges with rare outcrops while valley boards of Katun and Chuya rivers are steep and rocky. Steppe belt ((600) 800–1100 m above s. l.) occupies the bottoms of the basins (expanded river valleys) and sun exposed adjoining slopes. Forest-steppe belt (1100–1400 m) occurs on the boards of the basins and includes 2 subbelts: the transitional lower (1100–1200 m) and the main upper (1200–1400 m) ones. It is continuous in the Kanskaya and the Ursulskaya basins and fragmented on the slopes of the Katun and Chuya river valleys. The plant cover structure of each belt is determined by altitudinal types of communities as well as by stands of rocky sites (so called petrophytic steppes). Studied steppes belong to classes Festuco-Brometea (FB) — order Stipetalia sibiricae and Cleistogenetea squarrosae (Cs) — orders Helictotrichetalia schelliani and Stipetalia krylovii. The forest vegetation within the forest-steppe belt goes to Rhytidio-Laricetea (RL) and Brachypodio–Betuletea (BB)and steppe meadows — to Molinio-Arrhenatheretea (MA) — order Carici macrouri–Crepidetalia sibiricae. The phytocoenotic spectra of altitudinal and petrophytic types of communities in steppe and in the upper part of forest-steppe belts are similar in all four sites. The key association in steppe belt is Fragario viridis–Stipetum capillatae (FB). These in the forest-steppe belt are larch herb forests of the ass. Anemonoido caeruleae–Pinetum sylvestris laricetosum (BB), steppe meadows of the ass. Cruciato krylovii–Poetum sibiricae (MA) and the meadow steppes of two vicarious associations — Violo dissectae–Achnatheretum sibiricae (FB) in the Kanskaya basin and Cruciato krylovii–Caricetum pediformis (FB) in three other sites. The petrophytic steppes belong to two associations: Kitagawio baicalensis–Cleistogenetum squarrosae (Cs) on the sun exposed slopes and Galio paniculati–Caraganetum arborescentis (FB) on shadow ones within the steppe belt, and to subass. Carici pediformis–Spiraetum trilobatae schizonepetosum multifidae (FB) that occurs only on sun exposed slopes within the forest-steppe belt. The differences of phytocoenotic spectra of studied sites are determined by the vegetation of the transitional stripe. Forest communities of the ass. Primulo cortusoidis–Laricetum sibiricae (RL) cover the gentle slopes of the Kanskaya and Ursulskaya basins, petrophytic stands of the ass. Carici pediformis–Spiraetum trilobatae schizonepetosum multifidae (FB) occupy rocky sites. Forest communities of the ass. Galio paniculati–Laricetum sibiricae (RL) are commonon the steep slopes of the Katun and Chuya river valleys and petrophytic stands belong to the ass. Kitagawio baicalensis–Cleistogenetum squarrosae (Cs). The bottom of the Katun river valley with the very specific mesoclimate is occupied by steppe ass. Artemisio frigidae–Stipetum krylovii (Cs) that in general is not typical for the studied area.

scholarly journals Effect of landscape modification on primate assemblages of the Magdalena River Valley, Colombia

Caldasia ◽  
2021 ◽  
Vol 43 (2) ◽  
pp. 261-273
Author(s):  
Nestor Javier Roncancio Duque
Keyword(s):  
Community Dynamics ◽  
Plant Cover ◽  
Shape Index ◽  
River Valley ◽  
The Other ◽  
Weight Class ◽  
Plant Structure ◽  
Landscape Modification ◽  
Magdalena River ◽  
The Relationship

Population and community dynamics are affected by local landscape disturbances, and the answer of each species to these changes could differentially affect species survival. Natural land cover in the Magdalena River valley, Colombia, has been reduced by almost 70 % and fragmented. There inhabit isolated and reduced populations of Alouatta seniculus, Ateles hybridus, Cebus versicolor, and Saguinus leucopus (Primates). To understand the effect of fragmentation over these species, the relationship between altitude, landscape and class metrics, and plant structure and diversity with the population density of these four primates in 20 localities were assessed. Additionally, the relationship between the density of A. hybridus, assumed as a better competitor, and the density of the other primates was assessed. Mean shape index was the most related variable and affected positively the density of A. hybridus, C. versicolor, and S. leucopus and negatively that of A. seniculus. Weight class index was the second more important variable, the four primates increased their density where more mature is the plant cover. Diameter at breast height was positively related with the density of A. hybridus and C. versicolor, negatively related for A. seniculus and not related to S. leucopus density. Tree density was related negatively with the density of A. seniculus and positively with S. leucopus. A. hybridus was related to the density of the other primates, positively to A. seniculus and negatively to the other two species.

Statistical analysis of classification

1966 ◽  
Vol 24 ◽  
pp. 188-189
Author(s):  
T. J. Deeming
Keyword(s):  
Multivariate Analysis ◽  
Statistical Analysis ◽  
Classification Scheme ◽  
Analytical Procedure ◽  
Narrow Band ◽  
Scientific Research ◽  
Maximum Amount ◽  
Amount Of Information

If we make a set of measurements, such as narrow-band or multicolour photo-electric measurements, which are designed to improve a scheme of classification, and in particular if they are designed to extend the number of dimensions of classification, i.e. the number of classification parameters, then some important problems of analytical procedure arise. First, it is important not to reproduce the errors of the classification scheme which we are trying to improve. Second, when trying to extend the number of dimensions of classification we have little or nothing with which to test the validity of the new parameters.Problems similar to these have occurred in other areas of scientific research (notably psychology and education) and the branch of Statistics called Multivariate Analysis has been developed to deal with them. The techniques of this subject are largely unknown to astronomers, but, if carefully applied, they should at the very least ensure that the astronomer gets the maximum amount of information out of his data and does not waste his time looking for information which is not there. More optimistically, these techniques are potentially capable of indicating the number of classification parameters necessary and giving specific formulas for computing them, as well as pinpointing those particular measurements which are most crucial for determining the classification parameters.

1118: The Incidence and Duration of Postoperative Ileus in Patients Undergoing Radical Cystectomy. A Multivariate Analysis of Contributing Factors

2005 ◽  
Vol 173 (4S) ◽  
pp. 303-303
Author(s):  
Diana Wiessner ◽  
Rainer J. Litz ◽  
Axel R. Heller ◽  
Mitko Georgiev ◽  
Oliver W. Hakenberg ◽  
...  
Keyword(s):  
Multivariate Analysis ◽  
Radical Cystectomy ◽  
Postoperative Ileus ◽  
Contributing Factors
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