The Vegetation Structure and Floral Changes of 5 Years after Restoration of Cheonggyecheon Stream in Korea

2013 ◽  
Vol 726-731 ◽  
pp. 1548-1554 ◽  
Author(s):  
Bon Hak Koo
Keyword(s):  
Vegetation Structure ◽  
Life Form ◽  
Flood Plains ◽  
The Third ◽  
Introduced Plants ◽  
Flow Channels ◽  
Ecological Changes ◽  
Perennial Herbs ◽  
Concrete Materials ◽  
Straight Flow

The result of 5-years monitoring (2006-2010) in Cheonggyecheon stream, 328 floral species were found in 2006. In 2007, 2008, 2009 and 2010, total 446, 444, 471 and 510 species were found respectively. And among them, 233 introduced species were found in 2006, 312 species in 2007, 308 in 2008, 314 in 2009 and 300 in 2010 were found. Hazard species were found 3-5 species during study period. The rapid increasing in introduced plants was surveyed in the early 1stand 2ndyears. It has shown a relatively stable trend since the third year. By life form, herbaceous plants gradually increased in the early year. And annual and biennial herbs were dominated right after restoration and as time went by perennial herbs ratio increased. By family, flora belongs toCompositaefamily that was found most frequently. By section, 3rdand 4thsections constituted by natural genotypes, such as point bars, wide flood plains, riffles, ponds and marshes, were surveyed more species than 1stand 2ndsections constructed by artificial and non-ecological materials, such as concrete materials and narrow and straight flow channels. As a result, in stream restoration for ecological purpose, naturalized river or ecological river formation and management, rapid ecological changes would appear in the early 1stand 2ndyears, and artificial energy were included to reduce species disturbance. In that time, the stream ecosystem could be stabilized after restoration in the early three years or so.

scholarly journals Phytocenological research into the meadow associations on forest hunting grounds of Serbia

2010 ◽  
Vol 62 (2) ◽  
pp. 363-372
Author(s):  
Zorica Tomic ◽  
Zorica Bijedic ◽  
Dragica Vilotic ◽  
D.P. Gacic
Keyword(s):  
Life Form ◽  
Floristic Composition ◽  
The Third ◽  
Font Color

The floristic composition of meadow associations within the fenced areas of forest hunting grounds was investigated in the spring of 2008 at three sites: Karakusa (Srem), Miloseva voda (Mt. Sokolovica) and Lomnicka reka (Mt. Veliki Jastrebac), Serbia. At the first location three associations were determined (Agrostio-Juncetum effusi Cinc.1959., Trifolio-Agrostietum stoloniferae L. Mark.1973., and Agrostietum vulgaris. Z. Pavl. 1955 sensu lato.); at the second location Festuco-Agrostietum Horv. (1952) 1982. em Trinajest. 1972., and at the third location Agrostio-Festucetum valesiacae Gajic 1961. Hemicryptophytes were the dominant life form in all the sites (ranging from 61.1 to 72.9%). Also, the presence of 24 floral elements was recorded. The largest number of floral elements was determined at the site of Mt. Sokolovica (17), and the lowest at the third site, Mt. Veliki Jastrebac (9). <br><br><font color="red"><b> This article has been corrected. Link to the correction <u><a href="http://dx.doi.org/10.2298/ABS1801217E">10.2298/ABS1801217E</a><u></b></font>

scholarly journals Outbreeding and inbreeding strategies in herbaceous-shrubby communities in the Venezuelan Gran Sabana Plateau

AoB Plants ◽  
2019 ◽  
Vol 11 (4) ◽  
Author(s):  
Nelson Ramírez ◽  
Omaira Hokche
Keyword(s):  
Plant Species ◽  
Carbon Metabolism ◽  
Life Form ◽  
Sex Expression ◽  
Perennial Herb ◽  
Sexual System ◽  
Dioecious Species ◽  
Successional Stage ◽  
Sexual Systems ◽  
Perennial Herbs

Abstract Breeding system, sexual system, temporal variation in sex expression and herkogamy were evaluated in seven herbaceous-shrubby communities from the Gran Sabana Plateau, Venezuela. This analysis was conducted considering the life form, substrate type, succulence, carbon metabolism, nutritional relation, successional stage, pollination system specificity and endemism of plant species. Of the 348 plant species studied, 73.8 % were hermaphrodite, 16.9 % were monoecious and 9.2 % were dioecious. Plant sexual systems such as dichogamy and herkogamy were associated with life form, nutritional relations, carbon metabolism and pollination systems. Most species were adichogamous, followed by protandrous and protogynous. Protandry was high for perennial herbs, annual herbs and trees, and protogyny was most frequent in perennial herbs. Protandrous and protogynous species were frequently anemophilous. Herkogamy was higher than non-herkogamy. Herkogamy was higher for trees, shrubs and liana; higher in monophilous and lower in anemophilous species. Most of the hermaphrodites were herkogamous and adichogamous species. In contrast, monoecy were commonly perennial herb and dichogamous species and frequently associated with anemophily. Dioecious species were trees and shrubs and with polyphilous pollination. Dioecy was the most frequent sexual system for endemic species. Hermaphrodite species were similarly distributed across plant communities. Monoecy was slightly higher for savanna and fallow than the other communities, and dioecy was higher for shrublands and secondary bushland. Most plant species were non-agamospermous, non-spontaneous self-pollinated and xenogamous. Partially self-incompatible dominated, followed by self-incompatible, partially cross-incompatible and the lowest frequency corresponded to cross-incompatible species. All these results are discussed in the context of evolutionary and ecological trends.

Structural optimization design of water-cooling mirror with straight flow channels

2015 ◽  
Vol 81 ◽  
pp. 154-160 ◽  
Author(s):  
Xiao Chen ◽  
Ping Zhou ◽  
Ren-ke Kang ◽  
Zhi-gang Dong ◽  
Xiao-chen Ai
Keyword(s):  
Structural Optimization ◽  
Optimization Design ◽  
Water Cooling ◽  
Flow Channels ◽  
Straight Flow

On the conflicting generic delineation in the Onopordum group (Compositae, Cardueae - Carduinae): a combined nuclear and plastid molecular approach

2008 ◽  
Vol 21 (4) ◽  
pp. 301 ◽  
Author(s):  
Núria Garcia-Jacas ◽  
Mercè Galbany-Casals ◽  
Kostyantyn Romashchenko ◽  
Alfonso Susanna
Keyword(s):  
Dna Sequences ◽  
Second Life ◽  
Life Form ◽  
Plastid Dna ◽  
Life Forms ◽  
Morphological Characters ◽  
Central Asian ◽  
Perennial Herbs ◽  
Natural Groups ◽  
Sectional Rank

The limits of the genera that compose the Onopordum group of the Cardueae–Carduinae are difficult to establish. There are two main life forms; one is exemplified in the genus Onopordum, which includes only biennial colonisers in the Mediterranean region and temperate Eurasia; the second life form is exemplified in the group of perennial herbs of the genera Alfredia, Ancathia, Lamyropappus, Olgaea, Synurus, Syreitschikovia and Xanthopappus, all of them growing in the mountains of central Asia. We explored relationships among the genera of the complex by using Bayesian and parsimony analyses of a combined dataset of nuclear and plastid DNA sequences. Our results confirmed that the group is natural and the two life forms correspond to well defined entities. Generic limits within the eight central Asian genera are, however, very difficult to establish. Our results suggested that the present genus circumscription is artificial, especially for the largest genus, Olgaea, which appears paraphyletic. Some solutions are suggested. The most preferable might be lumping all small genera together in a broadly redefined genus Alfredia, and assigning sectional rank to the natural groups that result from correlating morphology with our molecular results. However, none of the possible solutions is free of problems because morphological characters and molecular phylogeny are not fully congruent. Some considerations on the origin and peculiar adaptations for becoming a successful coloniser shown by Onopordum are also offered, finding parallels to these adaptations in other examples of biennial colonisers within subtribe Carduinae.

The Great Caucasus alpine belt syntaxonomy. Alpine meadows with restricted distribution

2001 ◽  
pp. 17-35 ◽  
Author(s):  
K. O. Korotkov ◽  
E. A. Belonovskaya
Keyword(s):  
Vegetation Type ◽  
The Novel ◽  
Western Caucasus ◽  
Alpine Meadows ◽  
Alpine Belt ◽  
The Third ◽  
The Western Caucasus ◽  
Central Caucasus ◽  
Fruticose Lichen ◽  
Perennial Herbs

Alpine meadows with prevalence of perennial herbs and grasses and alpine fruticose-lichen heaths are widespread within the Great Caucasus alpine belt, 2400—3200 m above the sea level. The association Hedysaro hedysaroidis—Campanuletum collinae is met in the Western and Central Caucasus. The associations Alopecuro dasyanthi—Asteretum alpini, transitional to scree vegetation, and Nardo stricti—Geranietum gymnocauli, with some features of the alpine carpet-like communities, are common in the Western Caucasus. The last association can be divided into the 2 subassociations, N. —G. festucetosum variae and N.—G. cetrarietosum purpurascentis. The association Polygono vivipari—Kobresietum bellardii is restricted to the Central Caucasus. The association Potentiletum crantzii with the two subassociations P. c. vaccinietosum myrtilli and P. c. kobresietosum simpliciusculae and also the association Alchemillo sericeae—Caricetum umbrosae are common for the Eastern Caucasus. The third east-caucasian association, Astragaletum incerti, is specific for this region; it is met only on the extreme South of the high-mountainous Dagestan. The syntaxonomical differentiation between west- and central-caucasian associations is more distinct. Whereas the eastern ones are less differentiated both from each other and from the neighbouring vegetation type, the alpine carpet-like meadows. This could be explained by means of the hypothesis of continental fusion of syntaxa. All the above-mentioned associations are combined into the novel Caucasian alliance Alchemillo caucasicae—Campanulion tridentatae which is assigned to the European class Juncetea trifidi and the order Caricetalia curvulae.

scholarly journals Refining the workflow of combustion chamber with toroidal recirculation mixing zone

2018 ◽  
Vol 209 ◽  
pp. 00022 ◽  
Author(s):  
Mikhail Orlov ◽  
Vladislav Anisimov ◽  
Oleg Kolomzarov ◽  
Mikhail Anisimov
Keyword(s):  
Temperature Field ◽  
Combustion Chamber ◽  
Combustion Zone ◽  
Calculated Data ◽  
Second Step ◽  
Mixing Zone ◽  
The Third ◽  
Primary Zone ◽  
Flame Shape ◽  
Straight Flow

The object of the study is a straight-flow annular combustion chamber (CC) with toroidal recirculation-mixing zone which has significant reserves of minimization in size. The workflow of the CC has a number of problems, which arise due to the lack of experimental and calculated data. The aim of the study is to refine the design of the CC with toroidal recirculation-mixing to obtain the necessary workflow parameters. The first step of maturation involved the organization of swirl structure at primary zone. On the second step there were conducted the refining of the flame shape in primary combustion zone. The third step was devoted to the formation of the necessary temperature field at the outlet of the CC. As a result, an acceptable design of the combustion chamber was obtained.

The ecobiopolitics of environmental mitigation: Remaking fish habitat through the Savannah Harbor Expansion Project

2021 ◽  
pp. 030631272199254
Author(s):  
Ashley Carse
Keyword(s):  
Human Life ◽  
Fish Habitat ◽  
The Body ◽  
First Century ◽  
Savannah River ◽  
The Third ◽  
Center Stage ◽  
Adverse Impacts ◽  
Ecological Changes ◽  
Environmental Mitigation

Environmental mitigation has become a catch-all term for efforts to avoid, minimize or compensate for the adverse impacts of development. Through an analysis of the expensive and complex plan developed to mitigate the anticipated impacts of deepening Savannah Harbor, I develop an ecobiopolitical approach to mitigation. Environmental mitigation is triage, involving difficult choices about which entities are worthy of concern and, thus, candidates for intervention – and, by extension, which are not. It involves decisions about which among the chosen deserve strict protection and which merit looser forms of care. As these processes move to center stage in twenty-first-century governance and politics, it has become important to understand what kinds of environments mitigation generates. What survives? What dies? What flourishes? This article focuses on initiatives designed to maintain minimally suitable conditions for non-human life. Insomuch as the object of habitat mitigation is the animal milieu, rather than the body or population, it can be understood as a form of ecobiopolitics. By contrasting the projected fates of three fish in the post-mitigation ecology of the Savannah River, I argue that the ecobiopolitics of habitat mitigation can be conceptualized at four registers. The first, comparity, highlights the value-laden processes through which some entities become candidates for mitigation and others do not. The second, hierarchy, underscores how candidates for mitigation are ranked in ways that shape the interventions pursued. The third, nonfungibility, foregrounds how problems of commensuration are negotiated in mitigation practice. The fourth, overflow, emphasizes how mitigation aimed at one entity can lead to other ecological changes.

Relating Art and Mathematics

1930 ◽  
Vol 23 (1) ◽  
pp. 60-64
Author(s):  
Bertha Luella Weir
Keyword(s):  
High School ◽  
Cultural Values ◽  
Junior High School ◽  
National Council ◽  
Dynamic Symmetry ◽  
Square Root ◽  
High School Mathematics ◽  
The Third ◽  
Concrete Materials ◽  
And Mathematics

A very important problem in junior high school mathematics is to find concrete materials for the cultural values of mathematics, such as the appreciation of its beauty and to constructively develop the imagination of the pupil. Marie Gugle 's article on Dynamic Symmetry in "The Third Yearbook of the National Council" inspired me to introduce the root-two rectangle in connection with the work in square root and the Pythagorean Theorem.

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