Wyniki wyszukiwania - AGRO

1

The state of succession and species as indicators of the landscape value

100%

Szyszko J.

Annals of Warsaw Agricultural University. Horticulture (Landscape Architecture)

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2002

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tom 23

2

Succession of periphyton developing on artificial substrate immersed in polysaprobic wastewater reservoir

88%

Szlauer-Lukaszewska A.

Polish Journal of Environmental Studies

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2007

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tom 16

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nr 5

753-762

The succession of periphyton developing on artificial substrate immersed in a polysaprobic wastewater reservoir was studied during a two-year period. Three stages in the periphyton development: initial, intermediate and mature, were observed. The initial stage was characterized by domination of euglenophytes; Carchesium polypinum was dominant during the intermediate stage, while diatoms and chrysophyceans dominated the mature stage. However, the most characteristic component of periphyton consisted of detritus that contributed more than 50% (by volume). The periphyton development dynamics in the second year of the experiment, when that formation was already firmly established on the polyethylene sheets, was quantitatively similar to the process of periphyton development in the first year of substrate exposure.

3

Succession of ichthyofauna in dam reservoirs of Poland

88%

Mastynski J.

Acta Hydrobiologica

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1997

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tom 39

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nr Suppl.1

4

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Causes and directions of changes of meadow-pasture vegetations of the Wielki Leg Obrzanski (WLO)

75%

Klarzynska A., Kryszak A.

Steciana

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2014

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tom 18

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nr 2

The paper presents results of the studies conducted to determine causes and directions of transformations in vegetation of meadow-pasture communities in the area of the Wielki Łęg Obrzański [Great Obra Floodmeadows]. Multifaceted natural and habitat analyses were conducted on over 1800 relevés prepared in the vegetation seasons of 2005–2009 according to Braun-Blanquet. On their basis the phytosociological and floristic structure was analysed and habitat conditions were determined by phytoindication. Moreover, laboratory methods were applied in soil analyses to determine contents of basic macro- and microelements and groundwater table levels were recorded. Results referred to the documentation and archive literature made it possible to determine causes of transformations in plant communities in that area and outline probable directions in which succession was progressing. A lack of regular land use patterns is seen as the primary cause for the transformation in the flora of the Wielki Łęg Obrzański, particularly in the last 20 years. A considerable limitation of land use in certain sections of this area has led to the initiation of dominance of nitrophilic species such as Urtica dioica, Cirsium arvense, Potentilla anserina or Galium mollugo, while in the thinned sward it led to the development of grass species with very limited economic importance. Another equally important factor affecting the structure of vegetation cover is connected with air and water relations in soils, determined by the drainage system operating there for the last 200 years and by precipitation.

5

Directions of succession of Baltic vegetation

75%

Plinski M.

Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu

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1990

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tom 43

6

The theoretical approach to succession of family buisiness

75%

Tobak J., Nabradi A.

Roczniki Naukowe Stowarzyszenia Ekonomistów Rolnictwa i Agrobiznesu

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2016

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tom 18

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nr 4

The study deals with the questions and problems of the succession of generations concerning family enterprises, discussing the main succession issues. On a world scale most of the family businesses do not survive the first generation, thus succession has become the most important problem. This is the reason why the succession of generations has become the central issue of several research projects. In the diagnostic phase of the research the aim is to present the phases of succession of generations, the succession processes, their method and the possibility of processes especially characteristic of agricultural economics with the help of secondary data, with the application of contemporary research results and a methodological approach.

7

Vegetation of early stages of succession on sandy post-cultivated lands - selected examples

75%

Adamczak A.

Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu

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2004

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tom 69

8

Communities of Acarina in the soils of potato fields of Western Siberia

75%

Grishina L. G., Nikolskij V. V., Wasylik A.

Polish Ecological Studies

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1995

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tom 21

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nr 3

9

Temporal changes in the phytoplankton structure in a shallow, macrophyte-dominated lake [Lake Luknajno, Northeast Poland]

75%

Jaworska B., Kruk M.

Oceanological and Hydrobiological Studies

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2007

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tom 36

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nr Suppl.1

10

Transformations of the spring-complexes vegetation on the area of the Upper Parseta Catchment

75%

Osadowski Z.

Publications of the Department of Plant Taxonomy of the Adam Mickiewicz University in Poznan

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2000

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tom 10

11

Further investigations on the dynamics of colonization of pine [Pinus sylvestris L.] stumps by fungi

75%

Kwasna H.

Phytopathologia Polonica

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1992

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tom 03

12

Succession of fungi in the initial postindustrial soil

75%

Kowalik M.

Acta Mycologica

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1995

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tom 30

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nr 1

13

Malacocenoses of calcareous and silicaceous dumps in the Swietokrzyskie Mts. on the background of soil and vegetation conditions

63%

Barga-Wieclawska J.

Folia Malacologica

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1998

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tom 06

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nr 1-4

14

Climate - a changing component of forest site

63%

Kowalski M.

Folia Forestalia Polonica. Series A . Forestry

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1991

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tom 33

15

'Hot spots' on a new soil surface - how do testate amoebae settle down?

63%

Wanner M., Elmer M.

Acta Protozoologica

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2009

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tom 48

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nr 3

281-289

16

Variations of leaf economic spectrum of eight dominant plant species in two successional stages under contrasting nutrient supply

63%

Mao W., Li Y.-L., Zhao X.-Y., Zhang T.-H., Liu X.-P.

Polish Journal of Ecology

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2016

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tom 64

|

nr 1

Leaf functional traits are indicators of both plant community and ecosystem responses to environmental factors and can thus increase our capacity to understand ecosystem processes and community assembly due to climate change. The variation in leaf functional traits between succession stages in Horqin Sandy Land is caused by soil nutrient content and by intrinsic biological characteristic of species, but the effects are different. Leaf economic spectra were assessed for seven leaf traits of eight species from early and advanced stages of succession. Species from early succession stages are Agriophyllum squarrosum (L.) Moq., Corispermum macrocarpum Bge., Setaria viridis (L.) Beauv. and Pennisetum centrasiaticum Tzvel., and species from advanced successional stages are Chenopodium acuminatum Willd., Chloris virgate Swartz, Digitaria sanguinalis (L.) Scop. and Leymus secalinus (Georgi) Tzvel. All these species were grown in a greenhouse experiment under two contrasting nutrient supplies including high nutrient level (N , with 20 g of nutrient addition) and low nutrient level (N-, with no added nutrients). As expected, the resource uptake strategies of the species were affected by soil fertilization addition. Leaf nitrogen content (LNC), leaf phosphorus content (LPC), and photosynthetic capacity per unit leaf area (Aarea) significantly increased at high nutrient level but LPC is more dramatically changed than others leaf traits. Leaf life span (LLS) and specific leaf area (SLA) did not show similar tendency with succession stage. At the same nutrient level, LES still shows different pattern between the early and the advanced succession stages. Species from early succession stages have higher LPC and Aarea, compared to species from advanced stages. Species from early succession stage also tend to have higher SLA and higher LNC than at the advanced succession stage. The LLS did not show any clear changes with succession process. These results provide evidence that LES shift along the succession process is mainly caused by intrinsic biological characteristic of species.

17

Conservation and succesion in the plant cover of Polish reserves

63%

Herbich J.

Zeszyty Naukowe Wydziału Biologii, Geografii i Oceanologii. Uniwersytet Gdański. Biologia

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1986

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nr 07

18

Farmer decision making and its effect on subalpine grassland succession in the Giant Mts., Czech Republic

63%

Hejcman M., Pavlu V., Hejcmanova P., Gaisler J., Hakl J., Rauch O.

Acta Societatis Botanicorum Poloniae

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2006

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tom 75

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nr 2

165-174

Nitrogen deposition is generally considered as a main reason for many recent plant expansions, but management changes are often not taken into account. Understanding the effects of agriculture management in the past can be decisive in the explanation of plant expansions at present. In order to understand the spread of Molinia caerulea and Calamagrostis villosa into Nardus stricta dominated subalpine grassland in the Giant Mts. (Krkonoše, Karkonosze), we undertook an experiment to explain farmer decision making and we discussed its effect on grassland succession. We measured mowing productivity, yields, biomass quality and nutrient removal in N. stricta, M. caerulea, and C. villosa dominated swards. With regard to defoliation management performed on the subalpine grasslands for at least 500 years and cancelled after the Second World War, we found the following results and conclusions. 1. Mowing productivity, yield and forage quality were lowest in the N. stricta sward, therefore farmers preferred to harvest C. villosa and M. caerulea stands if they had the possibility to select a sward for mowing. 2. Removal of all nutrients was the lowest in the N. stricta sward. With respect to these facts, the competitive advantage of N. stricta is obvious under long-term scything without fertilization. Consequently, the recent increase of defoliation sensitive species M. caerulea and C. villosa above the timber line must be evaluated with respect to both: termination of agricultural activities and recent nitrogen deposition.

19

Submerged objects - a nice place to live and develop. Succession of fouling communities in the Gulf of Gdansk, Southern Baltic

63%

Dziubinska A., Janas U.

Oceanological and Hydrobiological Studies

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2007

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tom 36

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nr 4

65-78

20

Impact of taxonomic resolution on the indicatory information: studies on carabid beetles in Poland

63%

Schwerk A., Dymitryszyn I.

Polish Journal of Ecology

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2016

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tom 64

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nr 2

The informative power of species surrogacy with respect to ecological processes and anthropogenic influences has been rarely studied. Thus, five datasets on carabid beetles collected using pitfall traps were analysed in order to study the impact of changing the taxonomic resolution from species to genus level on their indicatory information: a dataset of eight study sites in differently managed habitats sampled in 2013, a dataset tracing successional changes from 2004 to 2013 in a naturally regenerated pine forest, a dataset of three sites on a heap of power plant ashes and a dataset of four sites on a colliery spoil heap, both sampled from 2004 to 2011, and a dataset of six sites along the roadside of a highway being renovated in 2009, sampled in 2008 and from 2010 to 2012. The datasets were analysed by studying correlations of species numbers with genus numbers and species based Shannon diversity with genus based Shannon diversity, testing compliance between species based and genera based similarity matrices, and comparing the information provided by ordination diagrams based on species information or genus information respectively. The results indicate that at least in our study a substantial amount of information provided by species data is still contained in the genus data, but information about fine graded differences between study sites gets lost. We conclude that, even if carabid genus information might be useful in some cases (e.g. preliminary biodiversity assessment), the limitation to higher taxonomic levels like the genus level has to be done with caution.

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