The distribution of Heterobasidion annosum in Scots pine stands in Nemenčinė Forest Enterprise, Mera and Magūnai forest districts were examined in this Master thesis. The object of the study: Scots pine stands that were established on formerly used agricultural land, former tank range areas and the stands growing in the cut areas of mature stands. Also, the Scots pine stands where after partly clear sanitation cuttings the birch groups were planted, in purpose to avoid the disturbances of Heterobasidion annosum. The aim of the study: to summaries the information about the distribution of Heterobasidion annosum in Lithuanian forests; to study the distribution of Heterobasidion annosum in Scots pine plantations established in agricultural lands and the cut areas of mature stands. The evaluation of the effectiveness of earlier used partly clear sanitation cuttings against Heterobasidion annosum in disturbed stands was also done. Methods: the distribution of Heterobasidion annosum in the forests of Nemenčinė Forest Enterprise, Mera forest district was evaluated visually. Each studied plot was evaluated according 4 grades. 6 assessment plots in Magūnai forest district were evaluated for the effectiveness of partly clear sanitation cuttings. The stand characteristics of the remained healthy pine and birch trees were measured using standard silvicultural mensuration methods, taking the measurements of each tree at breast height, in 2 cm precision. The results: The distribution of... [to full text]

Darbo tikslas: nustatyti ir palyginti tręšimo mineralinėmis trąšomis, pjuvenų kompostu ir miško kuro pelenais įtaką buvusiame Dumsių kariniame poligone kai kurioms smėlžemių fizikinėms ir cheminės savybėms bei įvertinti ten augančių pušies želdinių būklės ir augimo pagerinimo galimybes. Darbo objektas: smėlžemiuose augantys pušies želdiniai buvusiame Dumsių kariniame poligone; 2001 m. įrengti tręšimo mineralinėmis trąšomis bandymai ir 2005 m. įrengti bandymai, kuriuose kaip trąšos naudoti miško kuro pelenai ir pjuvenų kompostas. Darbo metodai: vizualiai 1 m² dydžio aikštelėse nustatytas dirvožemio žolinės dangos padengimas (%) (kiekviename variante sistemiškai išdėstyta po 5 aikšteles); išmatuotas (n=50) pušų prieaugis į aukštį ir vizualiai nustatytas spyglių pageltimas (dechromacija, %); nustatytas viršutinio mineralinio dirvožemio sluoksnio (0-5 cm; 5-10 cm ir 10-20 cm gyliai, jungtiniai ėminiai iš 20-ies vietų) pHCaCl2 rodiklis ir C, N ir S koncentracijos. Darbo rezultatai: išanalizuoti 2001-2005 metų duomenys; ištirtas tręšimo mineralinėmis trąšomis, pjuvenų kompostu ir miško kuro pelenais poveikis smėlžemių viršutinių horizontų pH rodikliui, C ir N koncentracijoms bei gyvąjai dirvožemio dangai, išanalizuotas ir palygintas pušies želdinių būklės ir augimo pagerėjimas, patręšus skirtingomis trąšomis. / The aim of the study: to determine and compare the influence of the application of the different doses of mineral fertilizers, sawdust compost and wood ash applied in complex with nitrogen on some physical and chemical properties of Arenosols in former military range area in Dumsiai; to evaluate the improvement possibilities of the condition and growth of Scots pine plantations in the area. The object of the study: Scots pine plantations growing on Arenosols in former military range area in Dumsiai; the fertilization trials where the mineral fertilizers were applied in 2001, and the fertilization trials where the sawdust compost and wood ash in complex with N fertilizers were applied in 2005 were further investigated. Methods: the ground vegetation cover (%) was visually assessed in 1 m² plots (5 plots were systematically laid in each treatment); height increment of Scots pine trees (n=50) was measured and discoloration of the needles (%) was visually assessed; mineral topsoil samples from 0-5 cm; 5-10 cm and 10-20 cm depths were collected (each combined sample was taken from 20 places), and chemically analysed for pHCaCl2, C and N concentrations. The results: the data of earlier investigations from the years 2001-2005 were analysed; the influence of the mineral fertilizers, sawdust compost and wood ash treatments on mineral topsoil pH, also the changes of N and C concentrations was analysed; the effects of the ground vegetation cover was assessed; the condition and growth... [to full text]