scholarly journals Phytolith assemblages in modern top soils under plant communities of Northern and Western Altay, Russia

2019 ◽  
Vol 9 (3) ◽  
pp. 429-435
Author(s):  
M. Yu. Solomonova ◽  
M. S. Blinnikov ◽  
N. Yu. Speranskaja ◽  
N. V. Elesova ◽  
M. M. Silantyeva
Keyword(s):  
Sea Level ◽  
Plant Communities ◽  
Statistical Analyses ◽  
Alpine Tundra ◽  
Bulliform Cell

We investigated 120 assemblages of phytoliths from modern top soils of 40 different plant communities of Northern and Western Altay region of Russia. The samples were collected from elevations between 360 m and 2360 m above sea level. Using statistical analyses, it was discovered that many communities produce sufficiently distinct assemblages based on standard morphotypes. Specifically we studied 6 kinds of forests (larch, spruce, fir, pine, cedar pine and birch-dominated), 3 kinds of steppes (true, meadow and petrophytic), 5 kinds of meadows (steppe-like, upland dry, wet floodplain, subalpine, alpine), alpine tundra, and mountain shrubland communities. The communities were not evenly sampled, with more redundancy in some types than in others. Using PCA, it was possible to reveal the few morphotypes most responsible for distinguishing different communities, e.g., low conical rondels, rondel sum, long cell sum, lanceolate cells with massive base, and bulliform cell sum.

scholarly journals The «red snow» of the Polar Urals (Western Siberia)

2019 ◽  
Vol 16 ◽  
pp. 00022
Author(s):  
Yuriy Naumenko
Keyword(s):  
Sea Level ◽  
Plant Communities ◽  
Western Siberia ◽  
West Siberia ◽  
Polar Urals ◽  
Snow Samples ◽  
The Polar Urals

Pink-red colored snow fields were sampled in the area of Ochety Lake (the Polar Urals, West Siberia) at the altitude of 272 m above the sea level in August 2019. Zygospores of Chlamydomonas nivalis prevailed in plant communities. Altogether, 9 species of algae have been discovered in snow samples: 7 species of Cyanoprokaryota, 1 species of Bacillariophyta and 1 species of Chlorophyta.

Predicting the effects of sea level rise on salt marsh plant communities: does vegetation age matter more than sea level?

2014 ◽  
Vol 148 (1) ◽  
pp. 5-18
Author(s):  
Antoine Meirland ◽  
Emilie Gallet-Moron ◽  
Hervé Rybarczyk ◽  
Frédéric Dubois ◽  
Olivier Chabrerie
Keyword(s):  
Salt Marsh ◽  
Sea Level Rise ◽  
Sea Level ◽  
Plant Communities ◽  
Marsh Plant ◽  
Salt Marsh Plant

scholarly journals Population biomorphological studies of Delphinium dictyocarpum DC. in Dzhungarskiy Alatau

2021 ◽  
Vol 102 (2) ◽  
pp. 63-69
Author(s):  
Nurzipa Saparbayeva ◽  
Keyword(s):  
Species Composition ◽  
Sea Level ◽  
Plant Communities ◽  
Vascular Plants ◽  
Population Biology ◽  
Plant Population ◽  
High Mountains ◽  
Ontogenetic Structure ◽  
Upper Third

This article presents the data of population-biomorphological studies of the larkspur (Delphinium dictyocarpum DC.) in the Dzhungarskiy Alatau. Purpose of the research isto study the distribution, phytocenotic confinement, biomorphology and structure of Delphinium dictyocarpum populations. The studies were carried out on the territory of the Dzhungarskiy Alatau ridge in 2015–2017. The structure of cenopopulations (CP) was studied in 2 plant communities (descriptions 1, 2). To study the density and ontogenetic structure of cenopopulations in communities transects were laid, divided into areas of 1 m2 in size. The type of cenopopulations was determined according to two classifications of B.A. Yurtseva (1987, 1988) and L.A. Zhukova (2013). When studying the biomorphology and structure of cenopopulations, we used the principles and methods adopted in modern plant population biology developed by L.A. Zhukova (2012) and “Program and methodology...” (1986). The study revealed that Delphinium dictyocarpum in the Dzhungarskiy Alatau grows at an altitude of 1600 to 3200 m above sea level, occupying the upper third or the summit of the high mountains. On the slopes the species is found along the outcrops of rocks and on stony-gravelly areas in the composition of shrub-forb-livebeet, cereal-forb meadows. The species composition of live bunch communities is represented by 125 species of vascular plants from 95 genera and 37 families. The height of the above-ground organs of Delphinium dictyocarpum ranged from 115 to 250 cm.

scholarly journals Current state of vegetation non-forest valley of the River Turia (Transcarpathian region)

2014 ◽  
pp. 308-323
Author(s):  
Ya. Sanislo-Pekar ◽  
G. Budnikov
Keyword(s):  
Key Words ◽  
Sea Level ◽  
Plant Communities ◽  
Rare Species ◽  
Vascular Plants ◽  
Current State ◽  
Meadow Communities ◽  
Floristic Classification

Distribution and composition of plant communities of meadows of the river Turja valley in highaltitude range from 150 to 800 m above sea level are presented in the article. According to the floristic classification 53 associations that belong to 13 unions, 7 orders and 4 classes are found out, described, identified and mapped. In the course of the flora studies 375 species of vascular plants, mosses and lichenes are found out. Key words: khorology, meadow communities, river Turja valley, management of meadows, rare species.

Snowmobile Impact on Three Alpine Tundra Plant Communities

1974 ◽  
Vol 1 (2) ◽  
pp. 101-110 ◽  
Author(s):  
Andrew M. Greller ◽  
Madeline Goldstein ◽  
Leslie Marcus
Keyword(s):  
Plant Community ◽  
Plant Communities ◽  
Alpine Tundra ◽  
Living Plant ◽  
Important Species ◽  
Cushion Plant ◽  
Cushion Plants ◽  
Plant Coverage ◽  
Winter Snow ◽  
Silene Acaulis

This paper describes the effects of 1,020 passages of snowmobiles, made over two winters, on three regularly winter-snow-free alpine tundra plant communities. A cushion-plant community on a 7-degrees slope showed a 31% reduction in total living plant coverage due to snowmobile impact. Destruction was greatest to soil lichens, rock lichens, and the cushion-plants Arenaria obtusiloba, Arenaria fendleri, Paronychia sessiliflora var. pulvinata, Silene acaulis, Eritrichium aretioides, and Phlox pulvinata. Graminoids generally survived to increase in importance. On a flat site, a cushion-plant community with Kobresia myosuroides as its most important species, showed the greatest loss of living-plant coverage, namely 46%. This was due primarily to the destruction of Kobresia, although Selaginella densa, Arenaria obtusiloba, Hymenoxys acaulis, and Eritrichium aretioides, also showed heavy losses. In a Kobresia turf community, destruction was decidedly less severe than in the cushion-plant communities, reduction in total living plant coverage being only 19%. It is suggested that the closed nature of the Kobresia turf, with its stiff tussocks, enables it to absorb impact well. It is recommended that snow-mobile travel be confined to Kobresia or similar turfs, when such travel is necessary under snow-free conditions.

scholarly journals Modern Analog Assemblages of Phytoliths Under Various Plant Communities of the Middle Volga and their Applicability for Archaeological Reconstructions

2021 ◽  
Vol 4 (38) ◽  
pp. 217-234
Author(s):  
Mikhail S. Blinnikov ◽  
◽  
Bruk R. Hoffman ◽  
Yulia A. Salova ◽  
◽  
...  
Keyword(s):  
Plant Communities ◽  
Statistical Analyses ◽  
Deciduous Forests ◽  
Multivariate Statistical Analyses ◽  
Vegetation Community ◽  
Multivariate Statistical ◽  
Middle Volga Region ◽  
Mixed Forests ◽  
Low Level ◽  
Middle Volga

The article describes the results of investigations of the sub-recent assemblages of silica phytoliths in top soils of various modern plant communities of the Middle Volga region in Tatarstan, Samarskaya and Ulyanovskaya oblasts conducted in 2017–2020. Counts of various phytolith morphotypes from 40 samples suggest a relatively low level of vegetation community specificity as revealed by multivariate statistical analyses. Nevertheless, coniferous and mixed forests can be distinguished based on the presence of a suite of conifer phytoliths, while steppes can be identified based on high proportion of rondels. Deciduous forests of the region can be detected based on high proportion of straight elongates and acutous bulbosus (trichome) type. Some matchings are made to 10 archaeological samples from various strata and ages across the region. Such samples reveal high proportion of cultured grass phytoliths and are most similar to steppes or agricultural assemblages in the modern dataset.

scholarly journals Complex Changes in Plant Communities across a Subarctic Alpine Tree Line in Labrador, Canada + Supplementary Appendix Table (See Article Tools)

ARCTIC ◽  
2015 ◽  
Vol 68 (4) ◽  
pp. 500 ◽  
Author(s):  
Andrew J. Trant ◽  
Keith Lewis ◽  
Brittany H. Cranston ◽  
Julia A. Wheeler ◽  
Ryan G. Jameson ◽  
...  
Keyword(s):  
Plant Communities ◽  
Species Turnover ◽  
Abiotic Factors ◽  
Elevation Gradient ◽  
Alpine Tundra ◽  
Tree Cover ◽  
Tree Line ◽  
Forest Tundra ◽  
Abrupt Changes ◽  
Species Establishment

As climate warms, abiotic factors, as well as plant community and biodiversity structure, may constrain or promote the movement of ecotone boundaries. Our study sought to examine how plant communities change across the tree-line ecotone of the Mealy Mountains in Labrador, Canada. We established eight transects (50–100 m in length) along an elevation gradient in three tree-line zones (forest, forest-tundra, and alpine-tundra) and recorded all species and cover of vegetation in contiguous 1 × 1 m quadrats. Companion abiotic parameters of nutrients and soil temperature were also measured. The absence of abrupt changes in important soil nutrients and growing season temperatures suggests that these factors do not limit tree species establishment beyond the current tree line. Vegetation cover and richness, however, were highly variable and in some cases changed non-linearly across the tree-line ecotone. Tree cover and species density generally decreased with elevation, while some field layer species (< 25 cm in height) increased; the latter change seems to be influenced by ground shrubs rather than herbaceous species. As expected, transects separated by the greatest difference in elevation were the least similar (higher beta diversity/species turnover); however, species turnover between the forest and forest-tundra transects was higher than it was between forest-tundra and alpine-tundra transects, even though the latter were separated by a greater elevation. Community structure and species turnover vary greatly across a tree line with the greatest differences between the forest and the forest-tundra, suggesting a biotic or abiotic barrier. While our ability to predict how the tree line will respond to continued climate change is complicated by these patterns in plant communities, the potential barriers investigated and others identified will be a useful focus for future studies.

scholarly journals Changes in plant communities of low‐salinity tidal marshes in response to sea‐level rise

Ecosphere ◽  
2021 ◽  
Vol 12 (7) ◽  
Author(s):  
Abbey Humphreys ◽  
Adrianna L. Gorsky ◽  
Donna M. Bilkovic ◽  
Randolph M. Chambers
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Plant Communities ◽  
Tidal Marshes ◽  
Low Salinity

scholarly journals A sporomorph ecogroup model for the Northwest European Jurassic - Lower Cretaceousi: concepts and framework

2004 ◽  
Vol 83 (1) ◽  
pp. 17-31 ◽  
Author(s):  
O.A. Abbink ◽  
J.H.A. Van Konijnenburg-Van Cittert ◽  
H. Visscher
Keyword(s):  
Sea Level ◽  
Plant Communities ◽  
Distribution Patterns ◽  
Climatic Changes ◽  
Quantitative Composition ◽  
Lowland River ◽  
Vegetation Distribution ◽  
Sea Level Changes ◽  
Palynological Assemblages ◽  
Nw Europe

AbstractBased on recent vegetation distribution and an integration of macropalaeobotanical and palynological information, a palaeocommunity model is explored that may permit detailed interpretations of quantitative sporomorph distribution patterns in the Jurassic and Early Cretaceous of NW-Europe in terms of changes in palaeoenvironment (sea-level, climate). The conceptual model is based on the recognition of Sporomorph Ecogroups (SEGs) that reflect broad co-existing plant communities, viz. upland, lowland, river, pioneer, coastal, and tidally-influenced SEGs. In successive palynological assemblages, shifts in the relative abundance of SEGs are thought to be indicators of sea-level changes. Climatic changes may be recognised through significant shifts within the quantitative composition of individual SEGs.

scholarly journals The stubble-field plant communities in South-Eastern Poland. P. IV. Plant communities of the Nanocyperion flavescentis alliance

2013 ◽  
Vol 44 (1-2) ◽  
pp. 171-193 ◽  
Author(s):  
Czesława Trąba
Keyword(s):  
Sea Level ◽  
Plant Communities ◽  
South Eastern ◽  
Field Plant ◽  
Different Soils

In the years 1972-1975, between August and September, on lowlands and on the area elevated to 500 m over the sea level, 85 phytosociological records were taken. On the wet stubble-field of the tested area two associations of tiny plants, belonging to the alliance <i>Nanocyperion flavescentis</i>, were specified. They were the following: I. <i>Hyperico-Spergularietum rubrae</i> and II. <i>Centunculo-Anthocerotetum</i>. I. The <i>Hyperico-Spergularietum</i> community occurred only on lowlands, on the sand and silt soils belonging to rye complexes. It was divided into two variants: with <i>Illecebrum verticillatum</i> and the typical one. II. The <i>Centunculo-Anthocerotettum</i> was met as well on lowlands, as on highland agricultural utility compelxes. The highland form of the community, differentiated into two variants: with <i>Hypericum humifusum</i> and the typical one, occurred in the mountain wheatland complex, on brown silt soils. The lowland form of the community in a typical variant was found on different soils and complexes (1, 2, 4, 5, 8).

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