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Investigations on tensile load-carrying ability of reed stems

100%

Kowalski W.

Acta Scientiarum Polonorum. Architectura

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2016

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tom 15

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nr 4

The investigations on mechanical properties of reed stems face numerous difficulties, because of their anisotropy, heterogeneity, shell-like structure, small lateral dimensions of stems and huge diversity of species and habitats of origination. Aware of all difficulties to cope with, the basic experiment has been conducted, that is the uni-axial tension test for reed stems, with- and without joints. The strain-stress relation, at tension, displayed an exponential character, showing material stiffening with the growth of strain. Test results incline to conclusion, that stem-pieces without joints are equally stiff as pieces with joints, however, they are twice as strong as the latter. It means, that joints can be perceived as fragile (in the sense: “brittle”) discontinuity in structure of reed stems. The results of the test have been put through critical estimate and analysis tending to statistical modelling of the load-carrying ability of reed stems.

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Reed canopy transparency under different levels of diffuse radiation

75%

Harenda K., Piatyszek M., Chojnicki B. H.

Acta Agrophysica

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2015

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tom 22

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nr 4

Diffused solar radiation increases ecosystem productivity. One of the explanations for this phenomenon is the fact that this type of radiation penetrates the vegetation layer more efficiently, thus changing radiation conditions under the plant canopy. The study of reed transparency under different radiation diffusion conditions makes it possible to estimate the amount of radiation energy that reaches plants living under the reed canopy. The presented radiation parameters were obtained using the SS1 probe (Delta-T Devices Ltd. UK.). The measurements were carried out in September 2014 in a reed canopy in the Rzecin peatland (52°45′N, 16°18′E, 54 m a.s.l.). Analyses showed that the transparency of the reed canopy (Tr) is directly proportional to the degree of diffusion (D*) of the radiation which reaches the plant surface and the reed Tr value is always greater at cloudy conditions than during periods of low radiation diffusion. At the same time, Tr is inversely proportional to the leaf area index (LAI). Under high diffusion of radiation the plants growing under the reed canopy gain approximately 38% radiation energy in comparison with periods characterised by low values of D*.

3

The effect of reed harvesting on reedbed birds community

75%

Goc M., Iliszko L., Kopiec K.

The Ring

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1997

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tom 19

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nr 1-2

4

Characteristics of an epiphytic assemblage (periphyton) inhabiting reed, Phragmites australis (Cav.) Trin. ex Steud. in Bukowo Lake

63%

Piesik Z., Obolewski K.

Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

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2001

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tom 05

5

Chemical composition of reed Phragmites australis [Cav.] Trin. ex Steud. versus density and structure of periphyton in various aquatic ecosystem

63%

Obolewski K., Strzelczak A., Kiepas-Kokot A.

Journal of Elementology

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2007

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tom 12

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nr 1

Analyses of three macroelements and six microelements in reed stems, accompanied by investigation of periphyton density were carried out in two reservoirs: Żarnowieckie Lake and Puck Bay. To reveal the influence of chemical composition of biotic substrate on periphyton qualitative and quantitative characteristics, ordination methods were applied (PCA, CCA, DCA, RDA). The results indicated that Copoepoda (Harpacticoida) and Chlorophyta preferred reed substrate with relatively high zinc, sulfur and chromium but low manganese and carbon content. In turn, Nematoda reached the highest density on a substrate rich in manganese. Mercury in reed limited density of Arachnidae-Hydrachnella and Chironomidae larvae, an effect which was not observed for Ciliata libera. Copepoda (Harpacticoida) preferred low chromium and lead content and high carbon/nitrogen ratio, which meant low nitrogen concentration in the reed substrate. Moreover, preferences of Nematoda and Bacillariophyta for freshwaters and Copepoda for brackish waters were indicated. The results presented in this paper should be treated as a contribution to more detailed research on interactions between reed chemical composition and periphyton density.

6

The variability of reed [Phragmites australis [Cav.] Trin. ex Steud. [Poaceae]] populations expressed in morphological traits of panicles

63%

Krzakowa M., Kolodziejczak M., Drapikowska M., Jakubiak H.

Acta Societatis Botanicorum Poloniae

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2003

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tom 72

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nr 2

Using a transect technique, each of 12 reed Phragmites australis (Cav.) Trin ex Steud. populations collected in middle part of Odra River-basin, represented by more than 30 plants, were compared with 3 populations from other part of the country and 1 from France. Each panicle was examined according to 15 morphological traits. Results of measurements were subjected to multivariate analysis of variance, to analysis of canonical variables and used for construction of a minimum spanning tree (= dendrite) on the basis of the shortest Mahalanobis distances. The obtained results indicate that populations are generally similar. One population from France (Orleans) shows visible separateness. It may suggest that morphological traits of panicles may be useful in investigations of the reed P. australis populations of a larger geographical distribution.

7

Periphyton inhabiting reed, Phragmites australis and artificial substrate in the eutrophicated Lubowidzkie Lake

63%

Obolewski K.

Archiwum Ochrony Środowiska

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2006

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tom 32

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nr 3

8

The variability of the two peroxidase loci [a dimeric and a monomeric one] surveyed in rhizomes of common reed [Phragmites australis]

63%

Drapikowska M., Baczkiewicz A., Krzakowa M.

Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu

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2005

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tom 72

9

Skuteczność funkcjonowania oraz zalety i wady trzcinowych oczyszczalni ścieków

51%

Jozwiakowski K.

Zeszyty Problemowe Postępów Nauk Rolniczych

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2008

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tom 532

W pracy przedstawiono wyniki badań skuteczności działania oraz zalety i wady trzcinowych, jednostopniowych oczyszczalni ścieków na przykładzie dwóch obiektów zlokalizowanych na terenie woj. lubelskiego. Zaletą trzcinowych oczyszczalni jest dość wysoka skuteczność zmniejszania BZT5, ChZT i usuwania zawiesiny ogólnej ze ścieków (79,2-98,7%). Dużą zaletą oczyszczalni trzcinowych jest również odporność na nierównomierny dopływ ścieków oraz możliwość skutecznego oczyszczania ścieków bardzo stężonych. Oczyszczalnie trzcinowe charakteryzują się prostą konstrukcją, są tanie i łatwe w eksploatacji oraz nie wymagają wyspecjalizowanej obsługi. Bardzo łatwo można je dopasować do otaczającego krajobrazu, dlatego mogą być stosowane w małych miejscowościach, w ośrodkach wypoczynkowych oraz przy gospodarstwach indywidualnych. Wadą oczyszczalni trzcinowych jest mniejsza skuteczność usuwania związków biogennych (11,0-86,5%) oraz gorsza skuteczność usuwania zanieczyszczeń w okresie zimowym. Obiekty tego typu potrzebują dość dużej powierzchni terenu na ich instalację.

10

Efficiency of purification of wastewater by a treatment with subsurface and surface flows

51%

Szajdak L., Jaskulska R., Hoppe A., Goldyn H., Arczynska-Chudy E.

International Journal of Ecohydrology and Hydrobiology

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2005

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tom 05

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nr 2

The removal of the nutrients: different forms of nitrogen, phosphorus and carbon, by two constructed wetland systems with reed (Phragmites australis) was investigated between the spring 2000 and the summer 2001. Two systems: reed pond with surface flow and sand reed bed with subsurface flow, have been compared Both the systems show high performance wastewater purification during whole vegetation season. Higher removal of nitrogen forms and organic carbon was observed in the reed bed with subsurface flows. This can be caused by higher biomass and density of plants than that, in reed pond with surface flow. The content of phosphorus in both systems significantly increased.

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Fouling fauna (zooperiphyton) inhabiting reed Phragmites australis (Cav.) Trin. ex Steud. in Lake Wicko Przymorskie

51%

Piesik Z., Obolewski K.

Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

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2004

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tom 08

12

Composition and density of plant-associated invertebrates in relation to environmental gradients and hydrological connectivity of wetlands

51%

Obolewski K.

Oceanological and Hydrobiological Studies

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2011

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tom 40

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nr 4

Ograniczanie wyników

Investigations on tensile load-carrying ability of reed stems

Reed canopy transparency under different levels of diffuse radiation

The effect of reed harvesting on reedbed birds community

Characteristics of an epiphytic assemblage (periphyton) inhabiting reed, Phragmites australis (Cav.) Trin. ex Steud. in Bukowo Lake

Chemical composition of reed Phragmites australis [Cav.] Trin. ex Steud. versus density and structure of periphyton in various aquatic ecosystem

The variability of reed [Phragmites australis [Cav.] Trin. ex Steud. [Poaceae]] populations expressed in morphological traits of panicles

Periphyton inhabiting reed, Phragmites australis and artificial substrate in the eutrophicated Lubowidzkie Lake

The variability of the two peroxidase loci [a dimeric and a monomeric one] surveyed in rhizomes of common reed [Phragmites australis]

Skuteczność funkcjonowania oraz zalety i wady trzcinowych oczyszczalni ścieków

Efficiency of purification of wastewater by a treatment with subsurface and surface flows

Fouling fauna (zooperiphyton) inhabiting reed Phragmites australis (Cav.) Trin. ex Steud. in Lake Wicko Przymorskie

Composition and density of plant-associated invertebrates in relation to environmental gradients and hydrological connectivity of wetlands