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2004
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tom 13
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nr 2
EN
A comparative analysis of three regional groups of phytocoenoses dominated by Phragmites australis was undertaken in order to find if they reveal any interregional differentiation in the habitat (water and substratum) conditions and if the differences are followed by floristic composition. A group of 60 phytocoenoses studied in mesotrophic and (mostly) eutrophic lakes of midwestern Poland were compared to two groups investigated in moderately nutrient-rich lakes of northeastern Poland (32 phytocoenoses) and nutrient-poor lakes of northern Poland (20 phytocoenoses). Statistical analyses revealed significant habitat differences. Although the groups of phytocoenoses were studied in different regions and different types of water bodies, they occupied habitats poor in bioavailable forms of nutrients in water and organic matter content and sodium in the substratum, which is inconsistent with the general opinion concerning the reed community as indicative for the high trophy level of lakes. Floristic differences among the studied groups of phytocoenoses are not significant in phytocoenotic terms and relate more to the type of lakes than to established habitat differences. This might suggest that the habitat-forming power of Phragmites australis is the main factor to influence habitat properties.
EN
This study aimed at evaluate the ecological states of four protected, mid-forest lakes located in mid-western Poland. Two means of evaluation were used and compared: biodiversity (expressed by phytocoe-notic diversity of macrohydrophyte vegetation) and habitat diversity (resulting from abiotic conditions and biota activity). The first method was based on the type and number of plant associations present in the studied lakes. The contribution of naturally and anthropogenically induced plant assemblages to lake vegetation was considered. The other method concerned morphometric, mictic and trophic features of the lakes and their water purity classes. The study results, especially a large number of plant assemblages and natural character of vegetation, evidenced a high degree of naturalness of all the reservoirs. However, re-sults obtained with the use of both methods were to a certain degree inconsistent. With respect to the type of catchment and mid-forest location as well as still limited anthropopressure, the phytocoenotic diversity more clearly differentiated the reservoirs and more accurately reflected their ecological status than the habi-tat diversity whose use - especially as the only or main method - seems to be rather limited.
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