Floristic Composition of a Stand of Pinus oocarpa in Honduras

Andre F. Clewell

doi:10.2307/2989810

Floristic composition of Wof-Washa natural forest, Central Ethiopia: Implications for the conservation of biodiversity

Feddes Repertorium ◽

10.1002/fedr.4921060123 ◽

1995 ◽

Vol 106 (1-5) ◽

pp. 127-147 ◽

Cited By ~ 1

Author(s):

Demel Teketay ◽

Tamrat Bekele

Keyword(s):

Floristic Composition ◽

Natural Forest ◽

Central Ethiopia ◽

Conservation Of Biodiversity

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Syntaxonomy of mid-successional stages of secondary forests of the central elevated part of the Southern Urals

Vegetation of Russia ◽

10.31111/vegrus/2012.20.109 ◽

2012 ◽

pp. 109-134

Author(s):

P. S. Shirokikh ◽

A. M. Kunafin ◽

V. B. Martynenko

Keyword(s):

Boreal Forests ◽

Floristic Composition ◽

Southern Urals ◽

Secondary Forests ◽

Natural Forests ◽

The Southern Urals ◽

Active Growth ◽

Tree Layer ◽

Shade Tolerant Species ◽

Successional Stages

The secondary birch and aspen forests of middle stages of succession of the central elevated part of the Southern Urals are studied. 4 subassociations, 1 community, and 7 variants in the alliances of Aconito-Piceion and Piceion excelsae are allocated. It is shown that the floristic composition of aspen and birch secondary forests in the age of 60—80 years is almost identical to the natural forests. However, a slight increase the coenotical role of light-requiring species of grasslands and hemiboreal forests in the secondary communities of the class Brachypodio-Betuletea was noticed as well as some reduction of role the shade-tolerant species of nemoral complex and species of boreal forests of the class Vaccinio-Piceetea. Dominant tree layer under the canopy of secondary series is marked by an active growth of natural tree species.

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Reed (Phragmites australis agg.) dominated plant communities in the Lower Volga Valley

Vegetation of Russia ◽

10.31111/vegrus/2015.26.26 ◽

2015 ◽

pp. 26-37

Author(s):

V. B. Golub ◽

V. V. Bondareva ◽

A. N. Sorokin ◽

L. F. Nikolaychuk

Keyword(s):

Expert System ◽

Phragmites Australis ◽

Plant Communities ◽

Floristic Composition ◽

Original Data ◽

Optimal Level ◽

Point Of View ◽

Original Structure ◽

Volga River ◽

Lower Volga

Plant communities with reed domination (Phragmites australis agg.) occupy the large areas in the Lower Volga Valley and especially in the river delta. We have set the task to reveal the diversity of these communities in the Lower Volga Valley. For this purpose, we applied the database that is registered in the Global Index of Vegetation-Plot Databases (GIVD) under the EU-RU–002 index (http://www.givd.info/) and includes 14871 relevés made during the period from 1924 to 2013. Communities with the dominance of reed were defined as such, if the coverage of this plant was more than 50 %. We have found 375 such relevés in the database. At first, one basal community, 3 associations and 3 subassociations with domination of Phragmites australis agg. were distinguished in the Lower Volga Valley. All processing and analysis of relevés were performed using the software package JUICE 7.0. (Tichý, 2002). The «Cocktail» method was applied to establish the sociological groups that indicate environmental conditions (Bruelheide, 2000). The expert system for selection from the database of relevés by means of these groups was created. It is allowed us to ascribe relevés to earlier distinguished associations, subassociations and basal community. 171 relevés have been identified by the expert system and they were assigned to association, subassociation or the basal community. 204 relevés were not referred to any association, subassociation or the basal community. We wanted to answer the question: are there among these 204 relevés, which could be interpreted as the new syntaxa, giving them the proper ecological characteristics? For this purpose, the cluster analysis of 204 relevés has been carried out. The optimal level of clustering was determined by calculating the index of “crispness of classification” (Botta-Dukát et al., 2005). The greatest “crispness of classification” was reached at allocation of 13 clusters. Consideration of the floristic composition of allocated groups had shown that 11 of them were the transitional plant communities among the earlier established syntaxa. Only two clusters were differed in rather original structure that we could explain by the influence of environment factors. We have identified them as new associations Rubio tataricae-Phragmitetum australis and Cynancho acuti-Phragmitetum australis. All associations with the dominance of Phragmites australis agg. distinguished in the Lower Volga Valley were included in the alliance Phragmition communis Koch 1926, order Phragmitetalia communis Koch 1926. In literary sources from the ecological point of view these syntaxa are defined as the wetland communities, which are closely linked to water bodies (Šumberová et al., 2011; Ermakov, 2012). However, in many cases this definition does not correspond to the ecology of plant communities with the dominance of reed in the lower reaches of the Volga River. Ecotops of these communities are flooded for up to 2–3 months in a year and then they dry out. In the autumn, the ground water level can drop to a depth of one meter (Golub et al., 2011). The plant satellites of the reed here are often mesophytic plants such as Rubus caesius, Calamagrostis epigeios, Phalaris arundinacea, Rubia tatarica, Althaea officinalis, and Rumex stenophyllus. Therefore, the inclusion of phytocoenosises with domination of the reed in the lower reaches of the Volga River in the alliance Phragmition communis is rather relative. A correct placement of these plant communities in the system of vegetation syntaxa of the arid areas can be made only if it is based on original data obtained from much bigger territory than the Lower Volga Valley. In future geobotanical studies, it is desirable to divide the aggregation of Phragmites australis agg. into smaller species taxa.

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Geobotanical studies at the Caucasus: a review of materials of the International Conference “Flora and conservation in the Caucasus: history and current state of knowledge” (Pyatigorsk, May 22–25, 2019)

Vegetation of Russia ◽

10.31111/vegrus/2019.36.91 ◽

2019 ◽

pp. 91-94

Author(s):

T. M. Lysenko ◽

V. Yu. Neshatayeva ◽

Z. V. Dutova

Keyword(s):

Plant Communities ◽

Aquatic Vegetation ◽

Plant Cover ◽

Floristic Composition ◽

Current Status ◽

Wide Field ◽

The Caucasus ◽

International Conference ◽

Rare And Endangered Species ◽

Current State

The International conference “Flora and conservation in the Caucasus: history and current state of knowledge” dedicated to the 130-year anniversary of the Perkalsky Arboretum took place at 22–25 of May 2019 in Pyatigorsk (Stavropol Territory) on the base of the Pyatigorsk Museum of local lore and natural history. The participants were from 11 cities of Russia and 7 Republics of the Caucasus and represented 14 institutions. Proceedings of the conference were published by the beginning of the meeting the book of abstracts includes 49 papers on the study of vascular plants, bryophytes, lichens and fungi, plant communities, as well as the protection of rare and endangered species, unique plant communities, and ecological problems in the Caucasus. The following geobotanical topics were highlighted in 13 papers: forest communities (3 reports), meadow and steppe vegetation (2), xeric open forests (2), communities of ecotone areas (1), structure of populations of rare plant species (3), as well as the history and current status of nature protected areas (2). The great emphasis has been focused on the study of floristic composition and plant populations. Thus, the conference showed that very few studies от vegetation are currently carried out in the Caucasus, and a lot of districts are not affected by the research. The greatest attention is paid to forest vegetation while meadow, steppe, alpine heath and xerophytic communities are studied rather poorly. Besides, there are “white spots” — mire, floodplain and aquatic vegetation. In nowadays, when the anthropogenic impact on the plant cover of the Caucasus is intensively increasing, it is especially important to study natural undisturbed communities preserved in protected natural areas. Another important issue is the conservation of the unique vegetation cover of the whole Caucasus. Thus, the study of vegetation of this region opens a wide field for researchers using various methods of modern plant science.

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