Vegetatio

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Vegetation dynamics: patterns in time and space
Vegetatio - Tập 77 - Trang 7-19 - 1988
Eddy van der Maarel
This paper introduces the collection of contributions in this special volume on temporal and spatial patterns of vegetation dynamics. First, it is pointed out that the dynamics of any piece of vegetation, large or small, is always dependent on the degree of isolation of that piece towards its environment. Then ten types of island situation are treated ranging from very much to very little isolated...... hiện toàn bộ
Phenological spread in plants: A result of adaptations to environmental stochasticity?
Vegetatio - Tập 43 - Trang 83-86 - 1980
Torbiörn Fagerström, Göran I. Agren
Plant species co-inhabiting a given geographical region often have distinetly different times of flowering. It is shown that such phenological spread, duc to short-term stochastic variation in weather variables, relaxes competition for empty sites to be colonized by diaspores. For sufficiently large spreads stable coexistence becomes possible. The applicability of the proposed hypothesis to the ob...... hiện toàn bộ
TheQuereus pubescens andQuereus faginea forests in the Basque Country (Spain): distribution and typology in relation to climatic factors
Vegetatio - Tập 90 - Trang 81-92 - 1990
Javier Loidi, Mercedes Herrera
A comparative study is made in order to establish relationships between floristic and bioclimatic gradient. An east-west strip of about 200 Km in the inner area of the Basque Country has been chosen.Quercus faginea andQuercus pubescens forests have been studied. The climatic parameters of eight meteorological stations located within the area have also been analysed. The results obtained show the e...... hiện toàn bộ
Community structure and species composition along a disturbance gradient in a communally managed South African savanna
Vegetatio - Tập 115 - Trang 157-167 - 1994
C. M. Shackleton, N. J. Griffin, D. I. Banks, J. M. Mavrandonis, S. E. Shackleton
The woody and herbaceous vegetation was investigated around four rural settlements in the savanna area of the eastern Transvaal Lowveld, South Africa. At each settlement three transects radiating out from the settlement, representing a gradient from high to low disturbance, were sampled for community structure and species composition. In general, attributes of woody community structure (density, h...... hiện toàn bộ
The status and ecology of a Juniperus excelsa subsp. polycarpos woodland in the northern mountains of Oman
Vegetatio - Tập 119 Số 1 - Trang 33-51 - 1995
Martin Fisher, Alex Gardner
Possibilities for dispersal in annual and perennial grasses in a savanna in Botswana
Vegetatio - Tập 102 - Trang 1-11 - 1992
W. H. O. Ernst, E. M. Veenendaal, M. M. Kebakile
Dispersal of 11 dominant grass species in the savanna of southern Botswana was investigated. The dispersal is autochorous, anemochorous and epizoochorous independent of the life-cycle (annuals, perennials). Dispersal distances were estimated experimentally. Anemochorous species with a plume-like spikelet such as Chloris virgata and Enneapogon cenchroides have a low rate of descent (<1 m s-1) and a...... hiện toàn bộ
Vegetation changes along a precipitation gradient in Central Argentina
Vegetatio - Tập 109 - Trang 5-14 - 1993
M. Cabido, C. González, A. Acosta, S. Díaz
Changes in vegetation along a precipitation gradient in Central Argentina were studied. Floristic samples were taken along an east-west transect of about 300 km. Correlation analysis between precipitation and ordination axes was used to provide an environmental interpretation of vegetation variability. Floristic analysis produced an ordination of plant communities from evergreen forests (precipita...... hiện toàn bộ
Zur Soziologie der Cymbalaria-Parietarietea, am Beispiel der Mauerteppich-Gesellschaften Italiens
Vegetatio - Tập 17 - Trang 208-213 - 1969
Erich Oberdorfer
Es wird, mit Gründen belegt, vorgeschlagen, die im mediterranen und atlantischen Europa weit verbreiteten, Stickstoff- und Feuchtigkeitsliebenden Mauerunkraut-(Mauerteppich-) Gesellschaften in einer eigenen Klasse der Cymbalario-Parietarietea zusammenzufassen. An Hand pflanzensoziologischer Aufnahmen aus Italien wird gezeigt, daß innerhalb dieser Pflanzengesellschafts-Gruppe neben dem Oxali-Pariet...... hiện toàn bộ
Kann die stetigkeitstabelle als nomenklato-rischer typus fur die assoziation dienen?
Vegetatio - Tập 24 - Trang 283-287 - 1972
S. Rauschert
Primary succession over sixty years on hundred-year old islets in Lake Hjälmaren, Sweden
Vegetatio - Tập 77 - Trang 159-168 - 1988
Håkan Rydin, Sven-Olov Borgegård
New islands were created as a result of an artificial lowering of the water table of Lake Hjälmaren in 1882–1886 and the floras of 40 such islands have been monitored ever since plant colonization started in 1886. Data used in this paper are from belt-transects across ten of these islands which were analysed in 1927–29 and reanalysed in 1986. During this 60-year period shading by trees has increas...... hiện toàn bộ
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