Dew moisture regime of endolithic and epilithic lichens inhabiting limestone cobbles and rock outcrops, Negev Highlands, Israel

Flora ◽  
2000 ◽  
Vol 195 (2) ◽  
pp. 146-153 ◽  
Author(s):  
Giora J. Kidron
Keyword(s):  
Moisture Regime ◽  
Rock Outcrops ◽  
Epilithic Lichens

Structure and dynamics of conifer–lichen stands on rock outcrops south of Lake Abitibi, Quebec

1983 ◽  
Vol 61 (3) ◽  
pp. 850-871 ◽  
Author(s):  
Stephen Clayden ◽  
André Bouchard
Keyword(s):  
Pinus Banksiana ◽  
Tree Canopy ◽  
Tree Seedling ◽  
Rock Outcrops ◽  
Bare Rock ◽  
Structure And Dynamics ◽  
Rock Types ◽  
Composition And Structure ◽  
Tree Seedling Establishment ◽  
Epilithic Lichens

The plant communities of shallow soil and bare rock on outcrops of rhyolite and basalt are described for the area south of Lake Abitibi, Quebec. Analysis of data from 34 sample plots by means of reciprocal averaging ordination indicates that most of the intersite variation in composition and structure is due to succession. The two rock types have distinctive assemblages of epilithic lichens and bryophytes but their thin soil communities do not differ significantly. Soil coverage and depth are controlled in part by bedrock slope and microtopography and increase uniformly in relation to the postfire age of the outcrop tree stands. The ground layer macrolichens and bryophytes undergo a succession of dominant species and growth forms, but the open-crown coniferous stands show little evidence of self-regeneration through tree seedling establishment or vegetative propagation. Stands of different age dominated by Pinus banksiana and by Picea mariana do not form a clear successional sequence. Fire recurrence prevents complete closure of the outcrop tree canopy.

Revision of the higher syntaxa of meadows in the Russian Far East

2009 ◽  
pp. 37-48 ◽  
Author(s):  
N. B. Ermakov ◽  
P. V. Krestov
Keyword(s):  
Russian Far East ◽  
Far East ◽  
Moisture Regime ◽  
Diagnostic Features ◽  
Northern Asia ◽  
Gentiana Scabra ◽  
Diagnostic Species ◽  
Drought Tolerant ◽  
Sedum Aizoon ◽  
The Russian Far East

A revision of the higher syntaxa of meadows of the Russian Far East has been made on the basis of results of ecological, phytocoenotic and chorological analyses of associations and higher units published by M. Achty­amov (1985, 1987а, б, 1995, 2000) and G. Dymina (1980, 1985). Conceptual basis for existing syn­taxo­nomic system of the meadows and leading diagnostic features of syntaxa have been reviewed. Authors propose to include all diverse Daurian-Manchurian meadows into two different classes. Hygro-mesic meadow communities of bogged flood-plane habitats with excessive moisture supported by subterranean waters have been included in the class Cala­magros­tietea langsdorffii Mirkin in Achtyamov et al. 1985. Diagnostic species are Anemonidium dichotomum, Calamagrostis langsdorffii, Caltha membran acea, Carex appendiculata, C. schmidtii, Filipendula pal­mata, Fimbripetalum radians, Galium davuricum, Iris laevigata. Lathyrus pilosus, Lysimachia davurica, Sanguisorba parviflora, Saussurea amurensis, Spiraea salicifolia, Stachys aspera, Nomenclature type of the class is the order Calamagrostietalia langsdorffii Achtyamov et al. 1985. Drought-tolerant xero-mesic meadows of zonal sites with fluctuating moisture regime supported by monsoon climate have been included in the class Arundinello anomalae—Agros­tie­tea trinii cl. nova hoc loco. Nomenclature type of the class is the order Artemisietalia mandshuricae Achtya­mov et al. 1985. Diagnostic species are: ­Aco­nogonon divaricatum, Adenophora pereskiifolia, A. ver­ticillata, Agrostis trinii, Artemisia desertorum, A. integrifolia, A. stenophylla, Arundinella anomala, Aster tataricus, Campanula cephalotes, Carex diplasio­carpa, Dianthus chinensis, Eupatorium lindleyanum, Galium verum, Gentiana scabra, Geranium vlassowia­num, Hemero­callis minor, Iris ensata, Lathyrus quin­quener­vius, Lupinaster pentaphyllus, Patrinia sca­biosi­folia, Poten­til­la fragarioides, Ptarmica acu­mi­nata, Ranunculus japonicus, Sedum aizoon, Serratula manshurica, Tha­lictrum amurense, Trommsdorfia cilia­ta, Vicia amoena, V. pseudorobus. The ranges of both classes are concen­trated in the Manchurian floristic province of Northern Asia, in regions with obvious Pacific and Sub-Pacific climatic regimes. Their western geographical limits run near the Yablonovy mountain ridge in the Eastern part of Baikal region. Westward, the Arundinello ano­malae—Agrostietea trinii and Calamagrostietea langs­dorffii are replaced by Euro­pean-Siberian meadows of the Molinio—Arrhe­na­theretea.

Plant communities on rock outcrops in the northwest part of the Black Sea Caucasian coast

2009 ◽  
pp. 3-14
Author(s):  
V. B. Golub ◽  
N. A. Grechushkina ◽  
A. N. Sorokin ◽  
L. F. Nikolaychuk
Keyword(s):  
Plant Communities ◽  
Black Sea ◽  
Soil Cover ◽  
Geographical Location ◽  
The Black Sea ◽  
Rock Outcrops ◽  
Exact Test ◽  
Main Factors ◽  
Phi Coefficient

The classification of petrophytic vegetation of coastal steeps was proposed for the Northwest Cauca­sian coast of the Black Sea using the Braun-Blanquet approach. The main factors that influence the deve­lopment of vegetation in question are abrasion and denudation sea coast processes. The coastal steeps in study area are formed by carbonate flysch. The plant communities occur on rocky slopes with poorly deve­loped soil cover, fine stone chips as well as rock crevices. Nine associations and four communities without syntaxonomic rank were documented in the table and described with respect to their phyto­socio­logical affinities, ecology, and geographical location. Diagnostic species of syntaxa were established using phi-coefficient calculations of fidelity and Fisher’s exact test. In addition, the results of relevé ordination were given using the algorithm of non-metric multi­dimensional scaling (NMS) that is embedded in PC-ORD 5.0 software package.

Vegetative Propagation of Woody Ornamentals Through Forcing of Epicormic Shoots

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 503c-503
Author(s):  
Paul H. Henry ◽  
John E. Preece
Keyword(s):  
Plant Material ◽  
Woody Plant ◽  
Clonal Plant ◽  
Light Regime ◽  
Moisture Regime ◽  
Stem Cuttings ◽  
Shrub Species ◽  
Woody Ornamentals ◽  
Ornamental Tree ◽  
Environmental Light

A propagation method is being developed that allows softwood shoots to be generated from stem sections of dormant woody plant species. These shoots, forced in the greenhouse during the winter, are subsequently collected and processed as softwood stem cuttings to produce clonal plant material. Many species in the nursery industry can only be propagated using softwood cuttings, and this technique allows propagation of these species to be initiated several months earlier than what is typically possible. Current studies involve expanded screening of ornamental tree and shrub species to determine if commercial production using this technique is feasible. Results demonstrate that many species may be propagated using this method, but that some species are more prolific than others with respect to number of softwood shoots produced. Additional studies are currently in progress to determine the environmental (light regime, moisture regime) and cultural (type of media) conditions that are optimal when producing clonal plant material via this technique.

Soil Moisture Regime Changes in Tephra-Mulched Soils

2002 ◽  
Vol 66 (1) ◽  
pp. 202 ◽  
Author(s):  
M. Tejedor ◽  
C. C. Jiménez ◽  
F. Díaz
Keyword(s):  
Soil Moisture ◽  
Moisture Regime ◽  
Regime Changes ◽  
Soil Moisture Regime

4 The Tyara Site

1968 ◽  
Vol 22 ◽  
pp. 44-79 ◽  
Author(s):  
William E. Taylor
Keyword(s):  
Sandy Beach ◽  
North Coast ◽  
National Museum ◽  
The West ◽  
Rock Outcrops ◽  
Small Boat ◽  
The North

The Tyara site, KkFb-7 in the National Museum catalogue and site file, faces the north coast of the Ungava mainland and rests on the west shore of Sugluk Island (Fig. 1). That island stands about five hundred yards from the mainland and from Sugluk Inlet, one of the few good harbors on that coast. This handsome little island, about one and one-half miles long and as wide, consists of rounded, rugged, hardrock hills that shelter well-vegetated, generally flat-floored valleys. The valleys often contain marshy patches. The shore, of variable incline, is quite jagged, a result of abrupt rock outcrops projecting seaward from brief stretches of sandy beach. The shore facing the mainland is, therefore, quite convenient for small boat use. Dark grey gneisses seem to predominate, although they are often cut by dykes and veins of lighter material, notably quartz. The dense, green valley and hillside vegetation includes willows, mosses, grasses, lichens, and a pleasant profusion of arctic wild flowers (Polunin 1948, Pt. III). I was told at Sugluk that at the head of the inlet, willows, growing in protected situations, reach the thickness of a man's wrist.

Drought signals inferred from ring-width and stable carbon isotope chronologies from Thuja occidentalis trees growing at their northwestern distribution limit, central Canada

2012 ◽  
Vol 42 (3) ◽  
pp. 517-531 ◽  
Author(s):  
Robert Au ◽  
Jacques C. Tardif
Keyword(s):  
Tree Ring ◽  
Tree Rings ◽  
Stable Carbon Isotopes ◽  
Stable Carbon Isotope ◽  
Ring Width ◽  
Ring Formation ◽  
Moisture Regime ◽  
Stable Carbon ◽  
Thuja Occidentalis ◽  
Central Canada

Stable carbon isotopes (δ13C) fixed in tree rings are dependent upon environmental conditions. Old northern white-cedar ( Thuja occidentalis L.) trees were sampled at their northwestern limit of distribution in central Canada. The objectives of the study were (i) to investigate the association between tree-ring δ13C values and radial growth in addition to the response of these variables to climate, (ii) to assess site differences between two sites varying in moisture regime, and (iii) to compare tree-ring δ13C of T. occidentalis with that of other boreal tree species growing at the northern limit of their distribution in central Canada. Over 2500 tree rings comprised of 15 T. occidentalis trees were analyzed for δ13C. Annually resolved δ13C (1650–2006) and ring-width (1542–2006) chronologies were developed. During the year of ring formation, ring width was associated with spring and early-summer conditions, whereas δ13C was more indicative of overall summer conditions. However, compared with δ13C values, ring width was more often associated with climate conditions in the year prior to ring formation. Conditions conducive to moisture stress were important for both parameters. Although ring width and δ13C corresponded to the drought intervals of the 1790s, 1840s, 1890s, 1930s, and 1960–1970, ring width may be more responsive to prolonged drought than δ13C. Tree-ring δ13C could, however, provide important information regarding physiological adaptations to drought.

Vegetation of rock outcrops in Guinea: granite inselbergs, sandstone table mountains and ferricretes — remarks on species numbers and endemism

Flora ◽  
1994 ◽  
Vol 189 (4) ◽  
pp. 315-326 ◽  
Author(s):  
Stefan Porembski ◽  
Wilhelm Barthlott ◽  
Stephan Dörrstock ◽  
Nadja Biedinger
Keyword(s):  
Rock Outcrops ◽  
Species Numbers ◽  
Table Mountains
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