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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Dirvos paruošimo būdo ir pasodinimo vietos įtaka eglės želdiniams Šilutės miškų urėdijoje / Influence Of Soil Scarification And Planting Site Selection For Norway Spruce Plantation In Šilutė Forest Enterprise

Uselis, Arūnas Juozas 14 January 2009 (has links)
Magistro darbe tiriamas dirvos paruošimo būdo ir pasodinimo vietos įtaka eglės želdiniams. Darbo objektas – Šilutės miškų urėdijos Stemplių, Šiaudėnų ir Žemaičių Naumiesčio girininkijų 1999 - 2005 metų paprastosios eglės želdiniai. Darbo tikslas – nustatyti dirvos paruošimo būdo ir pasodinimo vietos įtaką eglės želdinių prigijimui ir augimui. Darbo metodai – literatūros loginės analizės; apskaitos aikštelių metodas; duomenys apdoroti matematinės statistikos metodais. Darbo rezultatai. Įvertinant dirvos paruošimo būdo ir pasodinimo vietos įtaką eglės želdiniams buvo įvertinti 112 sklypų, iš jų Nc augavietėje 29 sklypuose, Lc – 72 sklypuose, Ld – 11 sklypų. Pagal dirvos ruošimo būdus tyrimo objektai išsidėstė taip: dirva ruošta kauburėliais – 83 objektuose, vagomis - riekėmis (sodinant į šlaitelį) – 15 objektų ir 14 sklypų kai dirva visai neruošta. Pagal medelių pasodinimo vietą tirti objektai pasiskirstė taip: pasodinti kauburėlio viršuje – 36 objektai, kauburėlio šlaite – 47 objektai, vagų – riekių šlaite – 15 objektų ir neruoštoje dirvoje – 14 objektų. Atlikus paprastosios eglės želdinių tyrimus priklausomai nuo dirvos paruošimo būdo ir pasodinimo vietos, gauta jog geriausiai medeliai prigyja, kai dirva ruošta kauburėliais Lc augavietėje. Palyginus gautus duomenis pagal medelių biometrinius rodiklius geriausi rezultatai gauti taip pat, kai dirva ruošta kauburėliais Ld augavietėje. Blogiausiais eglaičių prigijimas ir biometriniai rodikliai yra, kai dirva visai neruošta Lc... [toliau žr. visą tekstą] / In MG work is studding Norway spruce growing depending from soil preparation way and seating place. The work's object - Šilutė's enterprise Stempliai, Šiaudėnai and Žemaičių Naumiestis forestry 1999 – 2005 years Norway spruce plantation. The work's aim - value Norway spruce plantations growth depending from soil preparation way and seating place. The work's methods -literature logical analysis, accounting plots method; statistical methods for data work were used. The work's results. Valued Norway spruce growth depending from soil preparation way and seating place was value 112 plots, from its in Nc place - 29 plots, in Lc - 72 plots, in Ld – 11 plots. From soil preparation way investigation object are: micro rise soil preparation - 83 objects, trench - slice (planting in slant) - 15 objects and in 14 plots when soil not prepared. From sapling growth investigation object divided so: plant in micro rise - 36 objects, micro slant - 47 objects, trench - slice slant - 15 objects and not prepared soil - 14 objects. Navigated Norway spruce plantation investigation depending from soil preparation way and seating place, got, what best plant establishes, when soil preparation micro rise in Lc place. Comparison got information by plant biometrics parameters best result got, when soil preparation in Ld place too. Worst spruce establishes and biometrics parameters are, when soil not prepared in Lc place. In summary, best results find when soil prepared in micro rise.
2

Paprastosios pušies (Pinus sylvestris L.) žėlimui įtaką darantys aplinkos veiksniai / The environmental factors influence on scots pine (Pinus sylvestris l.) natural regeneration

Bačkaitis, Julius 09 June 2005 (has links)
The aim of this study is to investigate the possibilities of pine natural regeneration in different nature regions in the clear-cuts with main site types. The tasks of this work are: 1. to estimate a potential possibilities of pinewood natural regeneration; 2. to find out the ecological factors, that have a great influence on pine sprouts on the Na (dry not fertile), Nb (dry less than average fertile) and Lb (with excess water and less than average fertile) site types and to set their critical borders; 3. to find out the main economical factors, that promotes pine regeneration (site preparation, seed trees, shelter wood); 4. to prepare the recommendations to promote the pinewood natural regeneration. Recency and originality. This is the first investigations were made in complexly including the most common sites in Lithuania for pinewood (Na, Nb and Lb site types) in the three native regions covering largest part of Lithuania. This enables to make prognoses of pinewood regeneration in those regions on the mentioned site index. For the first time there were defined the sufficiency of the shelter-seed trees for regeneration and their distribution in a clear and step wise cutted areas to ensure the natural regeneration of pine. There were found that 2-3 point yield of pine seeds (under Capper) and on the time and in right way implemented encouragements, ensure natural pine regeneration after clear or step wise cuttings. Following the results, it was suggested to advance the... [to full text]

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