Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: extensive management

Sortuj według:

Ogranicz wyniki do:

Zbiorowiska roślinne siedlisk mokradłowych w dolinie Płoski - ocena aktualnego stanu w zależności od różnych form użytkowania

Łaska G.

Woda-Środowisko-Obszary Wiejskie

2009

T. 9, z. 4

141-162

W pracy przedstawiono wyniki badań fitosocjologicznych prowadzonych w 2008 r. w dolinie Płoski, na terenie dolnego odcinka rzeki w rejonie jej ujścia do Supraśli - powierzchnia 20,15 ha (województwo podlaskie, gmina Supraśl). Na obszarze o dużym zróżnicowaniu florystycznym badanego fragmentu doliny stwierdzono występowanie 172 gatunków roślin naczyniowych i 24 mszaków, reprezentujących osiem zbiorowisk roślinnych (łąki wilgotne, ziołorośla połąkowe, zbiorowiska szuwarów trzcinowych, zarośla łozowe, zbiorowiska łęgu jesionowo-olszowego i łęgu świerkowo-olszowego, ols porzeczkowy i borealną świerczynę na torfie), należących do pięciu klas syntaksonomicznych. W badaniach stwierdzono, że ograniczenie lub zaprzestanie użytkowania rolniczego wybranych płatów łąk z upływem czasu (1966-2008) prowadzi, w procesie sukcesji wtórnej, do głębokich zmian w strukturze zespołów roślinnych. W początkowych stadiach sukcesji następuje kształtowanie się ziołorośli połąkowych, a następnie zarastanie krzewami do zarośli łozowych i przez kolejne stadia rozwojowe do olsowych lub łęgowych zespołów leśnych.

Phytosociological study was carried out in 2008 in the Lower Płoska River valley in the area of 20.15 hectares at the outlet of the Płoska River to the Supraśl River (podlaskie voivodship, district Supraśl). In floristically differentiated area of the Lower Płoska valley 172 species of vascular plants and 24 mosses were identified. They represented eight plant communities from five phytosociological classes. According to the syntaxonomic approach, the following syntaxons were identified - Ass. Angelico-Cirsietum oleracei and Ass. Lysimachio vulgaris-Filipenduletum from the Molinio-Arrhenatheretea class, Ass. Phragmitetum australis from the Phragmitetea class, Ass. Salicetum pentadro-cinereae and Ass. Ribeso nigri-Alnetum from the Alnetea glutinosae class, Ass. Fraxino-Alnetum and Piceo-Alnetum from the Alno-Ulmion alliance and Querco-Fagetea class, Sphagno girgensohnii-Piceetum from the Vaccinio-Piceetea class. The results revealed that restriction or abandonment of agricultural management of wet meadows caused, during secondary succession, deep changes in the structure of plant communities, first by the formation of herbaceous plant communities and then by overgrowing by shrubs to a brushwood and finally to alder or riparian forest communities.

Abundance and diversity of soil microarthropod communities related to different land use regime in a traditional farm in Western Norway

Gulvik M., Błoszyk J., Austad I., Bajaczyk R., Piwczyński D.

Polish Journal of Ecology

2008

Vol. 56, nr 2

273-288

Acari and Collembola are the dominant groups within the mycophagous arthropods linked to fungal-based food webs in undisturbed soils. Studies on soil microarthropod communities in old, traditional, multifunctional farmland, and studies on secondary succession following marginalization and abandonment of traditional farmland are lacking in Europe. Thus, we studied patterns of microarthropod communities related to different land use regimes in a traditional farm in Western Norway. Soil mesofauna communities were analysed at four sites: site OM - old, herb rich, open hay meadow in traditional use; site F1 - abandoned hay meadow with pollarded trees (first fallow); site F2 - deciduous woodland (abandoned hay meadow with old pollards, heavily overgrown, second fallow); and site RM - restored hay meadow with scattered, newly pollarded trees. The abundance of the taxa varied considerably between habitats (for instance: total microarthropods - from 112.4 [plus or minus] 11.4 to 29.2 [plus or minus] 3.4, Acari - from 83.9[plus or minus] 10.2 to 15.6[plus or minus] 1.8 and Oribatida - from 68.6[plus or minus] 9.5 to 8.2[plus or minus] 1.3 x 10[^3] m[^-2], for OM and RM sites respectively). The abundance of total Acari, total Oribatida, Oribatida adults and juveniles differed significantly between OM-F1, OM-RM, OM-F2 and RM-F2 sites and it was significantly correlated with continuity of land use and/or tree cover. Oribatida was the group with the highest densities and percentage dominance (except RM site). The percent contribution of total Oribatida in Acari abundance was negatively correlated with the percentage of Actinedida. Nine Ptyctimina species, six Nothroidea species and four Uropodina species were detected, but most of them occurred as single individuals. Abundance of three Ptyctimina [Atropacarus (Atropacarus) striculus (C.L. Koch), Phthiracarus ferrugineus (C.L. Koch), P. globosus (C.L. Koch)], and two Uropodina [Trachytes pauperior Berlese and Dinychus perforatus Kramer] species differed significantly between some sites. The percentage similarity (Renkonen index) has a high indicative value for measuring the distance between ecosystems with apparently similar communities of Uropodina. The OM and RM sites differed most and site pairs - F1-F2 and F1-RM were the most similar. The densities of some taxa were about two- or three-fold greater for the F1site than the RM site. Ratios of Acari to Collembola, total Oribatida to Collembola and total Oribatida to Actinedida were highest on OM site (3.2, 2.6, 11.8 respectively) and decreased in the following order: F2>F1>RM (as an example, total Oribatida to Actinedida ratios were 9.8 on F2 site, 6.2 on F1 and 3.1 on RM). These ratios differed significantly between the OM and RM sites. The lowest ratios on RM site are probably an effect of recent disturbance (change of land use) of this site. Our results suggest that soil in OM site, despite constant disturbance during long time (scything, hay raking and sheep grazing), has probably a stable mesofauna community with the highest abundance of Oribatida. Our results have provided new knowledge about ecosystems in traditional farmland and can be used in monitoring programmes of post-arable land.