Spatial and size diversity of trees in untended pine stands of different initial density

Paper presents the analysis of spatial distribution as well as spatial diversity of DBH of living trees and trees of different biosocial class in 34 year old pine (Pinus sylvestris L.) stands of different initial densitiy. The following indices were applied: CE index (spatial distribution) and TD (spatial diversity of diameters). Living trees were distributed regularly in all analysed stands. The lower initial density, the more evenly trees were spaced. Taking into consideration the biosocial position of trees it can be stated that regularity was observed only in case of dominant trees (II Kraft's class). Trees of the other social classes were mostly randomly scattered. Groups of trees were never observed. Analysed pine stands showed small spatial diversity of diameters between nearest neighbors, both in case of living trees and trees of different social classes. The lowest diversity was observed in case of neighbors from predominand and codominant Kraft's class

The growth of Scots pine and grey alder in the mixed plantation on the fire−burnt area in the Potrzebowice Forest District

Grey alder (Alnus incana Moench.) in Poland is a recommended species for dry and oligotrophic habitat improvement and land reclamation. In Poland these issues have not been thoroughly investigated. The field experiment with Scots pine and grey alder in the mixed plantation was carried out on the fire−burnt area in the Potrzebowice Forest District. The proportion of grey alder in the species composition of plantations notably improved the growth of pine, but only with a 50−75% share of alder. This created some disturbances in the tending of plantations. The impact of pine on alder was negative

Mortzfeldt's method for the conversion of species composition of stand

The paper describes the Mortzfeldt's classical method [Mortzfeldt 1896] for the conversion of stand species composition by planting vulnerable forest tree species, specifically oaks, prior to planting of the main species in small clear−cut regeneration centres („nests”, „Löcherhieb”). At the same time the position of the Mortzfeldt's method in the felling system classification is established

The influence of the soil preparation after the forest fire on the survival and growth of the selected tree species

This paper refers to the investigation of the influence of the soil preparation methods and selection of the forest tree species for the forest regeneration on the surface after the forest fire and in case of the poor coniferous forest site types. Results come from the experiment established in 1994 in Notecka Forest according to the split−plots method. Five soil preparation methods were tested (furrows, furrows with subsoiler, subsoiler, full shallow ploughing and control) and six forest tree species (Scots pine, European larch, gray alder, silver birch, pedunculate oak, red oak). On the base of the analysis of variance the height growth and survival of the tested species during 6 year period were evaluated

Influence of grey alder on Scots pine growth in the dry oligotrophic habitats in a post-fire area

The experiment was established in the Potrzebowice Forest District in the area after the fire of pine forest. The planting was performed in April 1994, using 2/0 pine and alder seedlings in a different proportion: 0%, 25%, 50% and 100%. The seedlings were arranged in six complete blocks. A mixture planting of single trees and row of trees was applied. The soil was prepared in furrows without subsoiling (deep tilling). Preliminary results indicate the beneficial effect of alder on the size of breast height diameters of pine already with a 25% participation of this species. No effect on pine height was observed