scholarly journals Avena strigosa Schreb. in agrocoenoses of the Podlaski Przełom Bugu mesoregion

2012 ◽  
Vol 58 (1) ◽  
pp. 243-253
Author(s):  
Janina Skrzyczyńska ◽  
Zofia Rzymowska ◽  
Piotr Stachowicz
Keyword(s):  
Plant Communities ◽  
Soil Types ◽  
Agricultural Crops ◽  
Character Species ◽  
The Poor ◽  
Root Crops ◽  
Avena Strigosa ◽  
Composition And Structure ◽  
Spring Cereals ◽  
Phytosociological Relevés

The research on the localities of <i>Avena strigosa</i> and on its increased occurrence in agricultural crops of the Podlaski Przełom Bugu was carried out in 1994-1998. The documentation of this research consists of 600 phytosociological relevés and the floristic records. The paper presents the composition and structure of the field plant communities where <i>Avena strigosa</i> was found. It occurs frequently on various soil types of the Podlaski Przełom Bugu. However, on the area examined it was found just in small numbers, covering up to 5% of the area, while in the eastern part of the area an increase in its occurrence was observed. In the area of the Podlaski Przełom Bugu <i>Avena strigosa</i> occurred in spring cereals in the communities of <i>Arnoserido</i>-<i>Scleranthetum</i> and <i>Vicietum tetraspermae</i> as well as in the poor field communities, with the character species of <i>Aperion spicae</i>-<i>venti</i> and <i>Panico</i>-<i>Setarion</i>. Additionally, <i>Avena strigosa</i> was also found in the field communities of root crops belonging to <i>Panico</i>-<i>Setarion</i> alliance; however, it was present there just in small numbers.

scholarly journals Differentiation of arable field weed communities in the northern part of the Silesian Upland (S Poland)

2010 ◽  
Vol 61 (1) ◽  
pp. 85-92
Author(s):  
Beata Węgrzynek
Keyword(s):  
Chenopodium Album ◽  
Weed Species ◽  
Character Species ◽  
Modern Agriculture ◽  
Arable Field ◽  
Weed Communities ◽  
Composition And Structure ◽  
Rare And Endangered ◽  
Phytosociological Relevés ◽  
S Poland

Differentiation of arable field weed communities in the northern part of the Silesian Upland (S Poland) The purpose of this paper is to present the role of the selected species (i.e. associations character species, endangered as well as the most expansive weeds) in arable field communities in the area of the Tarnowskie Góry Ridge and the Chełm, two mesoregions of the Silesian Upland (southern Poland). On the basis of 750 phytosociological relevés taken using the method of Braun-Blanquet (Braun-Blanquet 1964) between 1995 and 2009, eight weed associations as well as numerous rump communities were distinguished. Phytocoenoses without a significant contribution of the association character species comprised about 68% of the patches analysed in the cereal crop and about 12% of the communities established in the root plant crop. Very often the character species of cereal weed associations occurred sporadically or in small numbers. Some expansive weeds (e.g. Apera spica-venti (L.) P. Beauv., Avena fatua L., A. xvilis Wallr., Chenopodium album L., Echinochloa crus-galli (L.) P. Beauv., Elymus repens L., Galinsoga ciliata (Raf.) S. F. Blake, G. parviflora Cav.) played an important role in the communities analysed. The vanishing of some weed species and the spread of others has resulted in the transformation of the composition and structure of the segetal communities, a vast majority of rare and endangered weed species in the studied area are considered to be very sensitive to modern agriculture methods, e.g. chemicalization, introduction of new crop cultivars, effective cleaning of seed materials, drainage etc. (Siciński 1998; Warcholińska 1998).

scholarly journals Plant communities of cultivated fields of the Podlaski Przełom Bugu mesoregion. Part 5. Root crop communities of light soils

2012 ◽  
Vol 60 (1) ◽  
pp. 191-205
Author(s):  
Zofia Rzymowska ◽  
Janina Skrzyczyńska
Keyword(s):  
Plant Communities ◽  
Floristic Diversity ◽  
Setaria Viridis ◽  
Habitat Conditions ◽  
Root Crop ◽  
Root Crops ◽  
Heterogeneous Habitat ◽  
Wide Range ◽  
Phytosociological Relevés ◽  
Segetal Communities

This present paper, focused on root crop communities of light soils, is a part of the wide range characteristics of segetal communities of the Podlaski Przełom Bugu (Podlasie Bug River Gorge) mesoregion. On the basis of 160 phytosociological relevés made according to the Braun-Blanquet method, phytocenoses representing the <i>Panico-Setarion</i> alliance were distinguished. Most often, patches of the association <i>Echinochloo-Setarietum</i> were recorded in the study area. Heterogeneous habitat conditions affect its floristic diversity. Two subassociations of the phytocenosis, divided according to the species composition into 9 lower syntaxa, were identified on light soils. The following subassociations were distinguished: <i>Echinochloo-Setarietum setarietosum glaucae</i> in a typical variant and a variant with <i>Juncus bufonius</i>, both with subvariants with <i>Digitaria ischaemum</i>, as well as a typical variant of <i>Echinochloo-Setarietum typicum</i>, a variant with <i>Juncus bufonius</i> and a subvariant with <i>Oxalis stricta</i> in the typical and wet variant. Another association found in root crops on light soils of the Podlaski Przełom Bugu mesoregion is <i>Digitarietum ischaemi</i>. Its patches were observed in cultivations on light, acidic, poor soils. The characteristic feature of this community is the occurrence of numerous acidophilous species. In habitat conditions typical for the Podlaski Przełom Bugu mesoregion, <i>Digitarietum ischaemi</i> is differentiated into the typical and wet variant. Quite frequent patches of the <i>Setaria pumila-Setaria viridis</i> community were noted in intermediate habitat conditions, between those characteristic for <i>Digitarietum ischaemi</i> and <i>Echinochloo-Setarietum</i>.

Long-term dynamics and destruction of marsh vegetation in the Kolokolkova Bay of the Barents Sea

2012 ◽  
pp. 66-77 ◽  
Author(s):  
I. A. Lavrinenko ◽  
O. V. Lavrinenko ◽  
D. V. Dobrynin
Keyword(s):  
Species Composition ◽  
Plant Communities ◽  
Barents Sea ◽  
Mean Value ◽  
Marsh Vegetation ◽  
Composition And Structure ◽  
The Mean ◽  
Species Composition And Structure

The satellite images show that the area of marshes in the Kolokolkova bay was notstable during the period from 1973 up to 2011. Until 2010 it varied from 357 to 636 ha. After a severe storm happened on July 24–25, 2010 the total area of marshes was reduced up to 43–50 ha. The mean value of NDVI for studied marshes, reflecting the green biomass, varied from 0.13 to 0.32 before the storm in 2010, after the storm the NDVI decreased to 0.10, in 2011 — 0.03. A comparative analysis of species composition and structure of plant communities described in 2002 and 2011, allowed to evaluate the vegetation changes of marshes of the different topographic levels. They are fol­lowing: a total destruction of plant communities of the ass. Puccinellietum phryganodis and ass. Caricetum subspathaceae on low and middle marches; increasing role of halophytic species in plant communities of the ass. Caricetum glareosae vic. Calamagrostis deschampsioides subass. typicum on middle marches; some changes in species composition and structure of plant communities of the ass. Caricetum glareosae vic. Calamagrostis deschampsioides subass. festucetosum rubrae on high marches and ass. Parnassio palustris–Salicetum reptantis in transition zone between marches and tundra without changes of their syntaxonomy; a death of moss cover in plant communities of the ass. Caricetum mackenziei var. Warnstorfia exannulata on brackish coastal bogs. The possible reasons of dramatic vegetation dynamics are discussed. The dating of the storm makes it possible to observe the directions and rates of the succession of marches vegetation.

scholarly journals Plant communities of the class Charetea Fukarek ex Krausch 1964 in Ukraine: an overview

2012 ◽  
Vol 25 (1) ◽  
pp. 75-82 ◽  
Author(s):  
Dmytro Iakushenko ◽  
Olena Borysova
Keyword(s):  
Plant Communities ◽  
Submerged Plant ◽  
Phytosociological Relevés ◽  
First Time

Abstract The paper presents the results of the first syntaxonomical survey of the submerged plant communities belonging to the class of Charetea Fukarek ex Krausch 1964 in Ukraine based on the interpretation of about 80 published and unpublished phytosociological relevEs. Fourteen associations of two alliances and one order are characterized briefly. The diversity of charophyte communities in Ukraine is also described in brief. A preliminary prodromus of charophyte communities in Ukraine is given. Associations of Charetum intermediae (Corillion 1957) Fija≥kowski 1960, Charetum rudis Dπmbska 1966, Nitelletumgracilis Corillion 1957 are indicated for Ukraine for the first time.

Influence of genotype and soil on root fan structures of Acer rubrum

1970 ◽  
Vol 48 (1) ◽  
pp. 147-152
Author(s):  
Richard J. Medve
Keyword(s):  
Plant Communities ◽  
Acer Rubrum ◽  
Soil Types ◽  
Red Maple ◽  
Root Characteristics ◽  
Third Order ◽  
Soil Sterilization ◽  
Seed Sources ◽  
Order Root

Soils collected from eight different plant communities that contained red maples (Acer rubrum L.) had little effect on root fan structures of red maple seedlings. Seedlings from eight seed sources, grown in the same soil types, showed a significant amount of variation for third order root characteristics. Root fan structures, especially those characteristics relating to beaded rootlets, were significantly affected by soil sterilization. Root fan structures were more copious and developed more rapidly on indigenous seedlings than on seedlings grown under greenhouse conditions.

scholarly journals The effect of the application of the exact and approximate methods on values of selected ecological indices

2014 ◽  
Vol 67 (1) ◽  
pp. 39-46
Author(s):  
Maria Ługowska ◽  
Zofia Rzymowska
Keyword(s):  
Wiener Index ◽  
Ecological Indices ◽  
Exact Methods ◽  
Approximate Methods ◽  
Winter Cereals ◽  
Spring Cereals ◽  
Phytosociological Relevés ◽  
Exact And Approximate Methods ◽  
Potato Crops ◽  
Tuber Crops

<p>The work presents the results of a study on the biodiversity of agrocenoses using ecological indices. In order to calculate the measures, phytosociological relevés were made and exact methods were applied in winter cereals, spring cereals, tuber crops and stubble fields. The objective of the work was to compare ecological indices (Simpson’s index of dominance <em>C</em>, Simpson’s index of species richness <em>D,</em> and Shannon-Wiener index of biodiversity <em>H</em>’) calculated using the number of plants and their cover determined based on the degree of presence. Moreover, correlation analysis was conducted between the indices computed using the two approaches applied.</p><p>The results of the study revealed significant differences between all the indices calculated using the exact and approximate methods. In turn, comparisons of the measures computed for individual crops showed significant differences only for potato crops and winter cereals. No significant differences were found between the indicators calculated for spring cereals and stubble fields.</p>

scholarly journals Plant communities of cultivated fields of the Podlaski Przełom Bugu mesoregion part vi. communities of root crops on compact soils

2012 ◽  
Vol 63 (1) ◽  
pp. 235-257
Author(s):  
Zofia Rzymowska
Keyword(s):  
Plant Communities ◽  
Small Proportion ◽  
Root Crops ◽  
Mass Occurrence ◽  
Suitable Habitats ◽  
River Valleys ◽  
Farm Buildings

Analysis of plant communities accompanying root crops on compact soils is presented in the paper. It is the next part of the review of plant communities of agrocenoses of the Podlaski Przełom Bugu (Podlasie Bug Gorge) mesoregion. The studied phytocoenoses were identified on the basis of 103 phytosociological relev&#233;s, made according to the Braun-Blanquet method. In the studied agrocenoses, plots of the associations <i>Lamio-Veronicetum politae</i>, <i>Galinsogo-Setarietum</i> and <i>Oxalido-Chenopodietum polyspermi</i> from the <i>Polygono-Chenopodion polyspermi</i> alliance were noted. Small patches of <i>Lamio-Veronicetum</i> and <i>Oxalido-Chenopodietum</i> were rarely noted in the studied area due to a small proportion of suitable habitats. In the area of Podlaski Przełom Bugu mesoregion, phytocoenoses of <i>Oxalido-Chenopodietum</i> developed in the river valleys on fertile muds and black soils. Typical plots of <i>Galinsogo-Setarietum</i> distinguishable by the mass occurrence of <i>Galinsoga parviflora</i> were only observed in the vicinity of farm buildings. Intermediate communities between <i>Panico-Setarion</i> and <i>Polygono-Chenopodion</i> polyspermi as well as phytocoenoces of <i>Echinochloo-Setarietum typicum</i> - subvariant with <i>Veronica persica</i> and <i>Echinochloo-Setarietum fumarietosum</i> - were also quite frequently noted in root crops on compact soils.

Comparative Analysis of Microbial Communities of Contrasting Soil Types in Different Plant Communities

2018 ◽  
Vol 49 (1) ◽  
pp. 30-39 ◽  
Author(s):  
E. A. Ivanova ◽  
E. V. Pershina ◽  
O. V. Kutovaya ◽  
N. Kh. Sergalieva ◽  
A. G. Nagieva ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Microbial Communities ◽  
Plant Communities ◽  
Soil Types

Assessing the Efficiency of Pan Traps for Collecting Bees (Hymenoptera: Apoidea)

2020 ◽  
Vol 55 (3) ◽  
pp. 321-328 ◽  
Author(s):  
Jacob Hudson ◽  
Scott Horn ◽  
James L. Hanula
Keyword(s):  
Plant Communities ◽  
Native Bees ◽  
Agricultural Crops ◽  
Ecological Functions ◽  
Natural Plant ◽  
Video Cameras ◽  
Declining Populations ◽  
Pan Traps

Abstract Native bees provide important economic and ecological functions that include pollination of agricultural crops and natural plant communities, thus conservation of their declining populations is important. The use of pan traps for collecting and monitoring bee populations has become widespread because the method samples widely different habitats with equal effort. However, to the best of our knowledge no efforts have attempted to quantify their efficiency. We measured the efficiency of pan traps at collecting bees by using video cameras to record individuals coming to the traps. Videoed bees were classified as approaching the trap, making contact with the trap, or being captured. During 52 h of video, 16 bees (19%) were captured, 25 bees (30%) made contact with the trap but were not captured, and 42 bees (51%) approached the trap and departed without making contact. The results of this study suggest that pan traps collect &lt;20% of the bees that are attracted to it and are likely to overestimate the abundance of smaller-bodied bees such as Lasioglossum spp.

Sign in / Sign up

Export Citation Format

Share Document