Raszyn, Poland
Raszyn, Poland

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An assessment of ectomycorrhizal fungi associated with Pinus sylvestris L. growing on abandoned post-agricultural soil was performed. The seedlings were growing at three different treatments of soil amendments (harvest residue, bark compost and sawdust). As a control treatment, the soil without any amendments was used. The comparison of ectomycorrhizal structure done ten years after the application of organic substrates showed no significant changes in species richness level. The most frequent taxa, irrespective of the treatment, was Wilcoxina sp. The result seems to be connected with high nitrogen level in the soil. Ectomycorrhizae of Cortinarius sp. and Pimrhiza spp. dominated in all treatments. The results showed that species richness and abundance of live and dead mycorrhizae depend on soil conditions, which are similar on treatment and control plots. © 2014, Polish Forest Society. All rights reserved.

The aim of the study was to characterize the diet composition of tawny owl in relation to environmental variables: season and availability of small rodents. Study area was located in central Poland, in Łódź voivodship, in the area of Rogów Forest District. It comprised of a mosaic of forests and arable lands. The study was done in the years 2003-2010. Pellets were collected at least twice a year in 18 tawny owl territories. Material collected between April and September was categorised as coming from spring-summer, while this from October-March period as autumn-winter season. Simultaneously, in the years 2004-2007, changes in the number of small rodents were monitored by live-trapping. Standard procedures of pellet analyses were used to identify 1926 prey items. Generally, diet composition was dominated by small rodents. Yet, their share was significantly higher in autumn-winter season (71.3 vs. 57.3%). Among rodents, yellow-necked mice, common voles and bank voles were caught most often. Soricomorphs accounted for 3% of prey items in both seasons on average. Birds formed approximately 15% of prey items and their share was comparable in warm and cold half year. On the other hand, in a warmer period owls preyed on invertebrates more often (23.0 vs. 7.5%). A breadth niche was wider in a warm (D=4.01) half year than in cold one (D=3.36). When a peak of rodent number was recorded, owls preyed on bank voles twice as often as compared to other years (increase from 6.4 to 11% of prey items), while an increase in the consumption of yellow-necked mouse was lower (from 27.5 to 34.2%). Tawny owls preferred yellow-necked mice and bank voles were avoided. This study showed that in the Rogów Forest tawny owl is an opportunistic predator. However, composition of its diet does not absolutely reflect the structure of assemblage of small mammals as certain species are preferred.

Gryz J.,Zaklad Ekologii Lasu | Krauze-Gryz D.,Samodzielny Zaklad Zoologii Lesnej i Lowiectwa | Goszczynski J.,Samodzielny Zaklad Zoologii Lesnej i Lowiectwa
Sylwan | Year: 2013

Presence of four owl species was confirmed in the area of Forest Experimental Station of WULS-SGGW in Rogów (central Poland) at the beginning of the 2000s. These were tawny owl, long-eared owl, little owl and barn owl. In the second half of the XX century migratory short-eared owls had also been recorded. Density of tawny owl territories per total area was 2.6/10 km2. For long-eared owl it was lower (1.5/10 km2). Little owls and barn owls were very rare and both species have probably decreased severely in the last several years. Despite fluctuations in the abundance of forest rodents, number of tawny owl pairs was reasonably stable throughout study time. In the case of long-eared owl its numbers varied between years.

Article presents the assessment of growth and survival of silver fir seedlings planted under stand canopies constituted by common beech, European larch, Norway spruce, Scots pine and silver birch. Measurements were carried out in Karkonoski National Park (SW Poland) in 2001 and 2011. The tallest trees were growing under the canopy of larch both in 2001 and 2011.

This paper presents a study on a population of Pulsatilla patens conducted in 2012 in the Myszyniec Forest District in Natura 2000 area 'Myszynieckie Bory Sasankowe' in the Kurpie forest (NE Poland). The purpose of the study was to determine the population structure of Pulsatilla patens, especially with regard to abundance, density, and percentage of generative plants in the total population. Correlations were examined between these population features and selected environmental characteristics including ecological indicator values, community layer coverage, number of species group. For the evaluation of the linear relationship between the variables, Spearman's correlation coefficient was used. The research confirmed a significant effect of light availability, clear cuttings areas on all mean values of such indicators of plants as number of flowers, number of plants, share of vegetative and generative plants.

The paper concerns forest populations of lady's slipper orchid (Cypripedium calceolus L.). The study sites were located in localities with the most numerous populations of Cypripedium calceolus L. in managed forests in Poland. The field studies were conducted in 2012 according to Natura 2000 sites protocols. The aim of studies was the determination of population structure of lady's slipper orchid, especially in indexes reflected number of flowering and fruit plants. The relations between above factors and environmental conditions expressed by ecological indicator values, cover of vegetation layers, species richness, stand age, and intensity of thinning were studies. The obtained results confirmed negative influence of understorey layer and positive influence of density of tree layer on the development of studied orchid populations. The increase in thinning intensity has not significant influence on protection status of Cypripedium calceolus. © 2014, Polish Forest Society. All rights reserved.

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