Time filter

Source Type

Warsaw, Poland

Major results of the 45-year-long study on the dynamics of strictly protected forest stands, using 3 permanent study plots, 25×100 m each, located on a former narrow strip clear cut established in the beginning of the 20th century on the northern slopes of the Mt. Łysica (the Świȩtokrzyskie Mountains, Central Poland) are presented. The general development of forest stands is analysed, including change of overall density, tree mortality rate (general and by species), dynamics of basal area and average tree diameter, competitive ability as well as changing role of particular species (mainly European beech, silver fir, sycamore and Norway spruce) in formation of the general stand structure. The results of the study are compared with other investigations of similar type.

Paper compares various analysis methods suitable for an analysis of point pattern with directionally varying point density. As example was used point pattern from spacing experiment created according to Nclder design in which tree density changes greatly but in smooth manner. Such a pattern could be not analysed by methods assuming homogenous point density e.g. classical estimator of Ripley's K function. More useful are estimators of Ripley's and pair-correlation functions for inhomogeneous point patterns. KZ function, which proved to be efficient for heterogeneous point patterns with distinct changes in the local point density appears not to be efficient for heterogeneous point patterns with smooth changes in density.

Study presents a classification model for predicting the occurrence of mass damage in young forest plantations caused by insect pests on roots belonging to Melolontha genus. Logistic regression model was built on the basis of 10 taxation features describing 177 young stands. Habitat fertility, occurrence of Scots pine and European beech, and weed infestation of the habitat are the most significant features that influence mass occurrence of cockchafer larvae acting as insect pests on roots in plantations.

Brach M.,Katedra Urzadzania Lasu | Bielak K.,Katedra Hodowli Lasu | Drozdowski S.,Katedra Hodowli Lasu
Sylwan | Year: 2013

Paper presents results of measurement accuracy evaluation of two laser rangefmders (TruPulse and ForestPro integrated with MapStar compass) mounted on monopod and tripod under the forest conditions. The precise data on spatial coordinates of 34 trees in the Rogów Arboretum and 8 points from the geodetic control network in the Głuchów Forest were used. The results show that the measurement sets equipped with ForestPro and MapStar were more accurate than TruPulse ones. However, no significant influence of applied stands on the measurement accuracy was observed.

The effect of the controlled mycorrhization with the fungus Hebeloma crustuliniforme, the application of fungicides (Bayleton 25 WP, Falcon 450 EC, Nimrod 250 EC and Siarkol Extra 80 WP) in the nursery and the use of two types of substrate (a mixture of sterilized Estonian peat with vermiculite and unsterilized Polish peat with perlite) on the growth, level of infestation by powdery mildew and form (single, multi-stem) of oak trees in the first four years after planting was analysed. The type of the substrate and controlled mycorrhization did not affect the growth of young trees. Oaks treated with Nimrod in the nursery were the tallest after outplanting, but grew slower compared to trees in other variants. The oaks protected with the triazole fungicides (Falcon and Bayleton) in the nursery showed higher level of infestation by powdery mildew in the plantation.

Discover hidden collaborations