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Cryopreservation (storage in liquid nitrogen, –196°C) is a technique that ensures safe, long−term conservation of plant species with recalcitrant seeds, vegetatively propagated species and biotechnology products such as somatic embryos, cell lines and genetically transformed material. The aim of cryostorage is to keep plant tissue in a safe way, which does not cause changes during storage at neither...
The study evaluates the antifeedant activity of rutin and quercetin (flavonoids of buckwheat Fagopyrum esculentum) and the extract from the leaves of black alder Alnus glutinosa on the development and the extent of damage caused by the beetles of cockchafer Melolontha melolontha in laboratory and semi−field conditions. We found increased mortality and decreased intensity of beetle feeding on the Quercus...
The aim of the study was to determine the effect of temperature and humidity on colonization of cambio− −xylophagous insects on Norway spruce branches in relation to the place and method of slash utilization. Analyzed branches were infested by eight species of cambiophagous and two species of cambioxylophagous, whereas the material utilization method does not substantially influence the entomofauna...
Research was carried out in Scots pine (Pinus sylvestris L.) stands damaged by strong wind in six locations in Poland. The aim of this study was to analyse the radial variation of compressive strength parallel to grain in the wind−broken trees and neighbouring survivors. Strength tests were conducted in moisture above saturation fibre point. There were no significant differences in the radial distribution...
Deformation of root system as a result of root crookedness, bending or other injuries during plantation represent the main reason predestinating trees to parasitic infection. The objective of the presented work was the determination of the intensified occurrence of root deformation during tree plantation and the appearance of root pathogens. Observations were carried out on 5 sites localized in young...
We investigated annual height increment of sessile oak and common hornbeam planted on clear−cut in respect to the distance to the adjacent mature Scots pine stand. The study area was divided into 3 zones (I−III) each of 20 m width. The four analyzed treatments were defined on a basis of a mingling form: W1 – a monoculture of oak (control plot), W2 and W3 – two types of row mixture, W4 – single tree...
An attempt was made to determine fire selectivity for different vegetation classes and habitat conditions using the HSI (Habitat Suitability Index) model. This is an example of expert model based on theoretical knowledge and experience of researchers. HSI analyses were originally designed to study animal habitat preferences. The assessment of inherent differences in the flammability of the selected...
This paper addresses problems associated with the silvicultural planning in the Norway spruce mire forests (Sphagno girgensohnii−Piceetum Polak. 1962) that are characterized by an uneven−aged structure and a high degree of irregularity at small scale. Based on detailed inventory using 30 permanent circular sample plots in two control units located in the Augustów Forest (NE Poland), the BDq method...
The paper concerns the occurrence of small−leaved lime in the Polish forests on the basis of stand descrip− tion contained in the main database of the State Forests. The analysis includes the geographical occur− rence of lime in all forest layers and according to age class of stands with lime as well as their habitat and soil preferences. Special attention was paid to the stands with lime as the dominant...
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