Latvian State Forest Research Institute "Silava" is the main centre of forest science in Latvia and leader of scientific ideas in forestry and the related research and development in the country.

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LSFRI Silava scientists achieved the degree of Doctor in Forest Sciences

LSFRI Silava scientists Baiba Jansone, Santa Kalēja, Oskars Krišāns, Ilze Matisone and Agris Zimelis achieved the degrees of Doctor of Science (Ph.D.) in Agriculture, Forestry and Fisheries, successfully defended at the public sessions of the Promotion Council of Forest and Material Sciences, hold in LSFRI Silava on December 28–30, 2020.

BAIBA JANSONE's doctoral thesis "Variation of height growth of young pure Norway spruce (Picea abies (L.) H. Karst.) stands" was carried out in Latvian State Forest Research Institute "Silava" and Latvia University of Life Sciences and Technologies. The doctoral studies were carried out at Latvia University of Life Sciences and Technologies in period from 2018–2020.
The aim of study was to assess the effect of microenvironmental conditions and genetic on the height increment of Norway spruce at a juvenile age in planted hemiboreal forests in Latvia. The specific objectives of the thesis: 1. To characterize the effect of the microenvironmental (competition of ground vegetation and soil moisture regime) and genetic on lammas shoots of Norway spruce; 2. To characterize the effect of an improved nutrient supply on the height growth of Norway spruce; 3. To characterize the intra-annual differences in shoot elongation between open-pollinated families of Norway spruce plus-trees.
Supervisors of the doctoral thesis: dean of Forest faculty of Life Sciences and Technologies Dr.silv. Linards Sisenis, senior researchers of LSFRI Silava Dr.silv. Dagnija Lazdiņa and Dr.silv. Āris Jansons.
Summary of doctoral thesis here.

SANTA KALĒJA's doctoral thesis "Technological and economic solutions of mechanised forest biofuel production in thinning" was carried out in Latvian State Forest Research Institute "Silava". The doctoral studies were carried out at Latvia University of Life Sciences and Technologies in period from 2012–2017.
The aim of study was to investigate, which factors have significant impact on productivity and costs of biofuel production, to evaluate wood resources in forest stands, where thinning has been delayed, and to elaborate proposals for mechanization of thinnings. The specific objectives of the thesis: 1) To estimate the available wood resources in young stands, where thinning has been delayed, and the technologically available wood biofuel resources in such stands in Latvia. 2) To investigate, which factors affect productivity of forest operations and prime cost of wood biofuel production in thinning implemented either mechanically or using a chainsaw. 3) To evaluate the impact of different mechanization solutions on the profitability of wood biofuel production.
Supervisors of the doctoral thesis: senior researchers of LSFRI Silava Dr.silv. Andis Lazdiņš and associated Professor of Latvia University of Life Sciences and Technologies Dr.sc.ing. Ziedonis Sarmulis.
Summary of doctoral thesis here.

OSKARS KRIŠĀNS's doctoral thesis "The effect of root rot and bark-striping on wind stability of Norway spruce (Picea abies (L.) H. Karst.)" was carried out at Latvian State Forest Research Institute "Silava". The doctoral studies were carried out at Latvia University of Life Sciences and Technologies in period from 2012 to 2015.
The aim of study was to assess the effect of root rot and bark-stripping on possibility of wind induced damages in Norway spruce stands. The specific objectives of the thesis: 1. To characterize the possibility of wind induced damages in Norway spruce stands on peat and mineral soils in accordance with distribution of aboveground biomass and root plate dimensions. 2. To characterize the effect of structural strength of wood affecting factors, such as root rot and bark-stripping on the possibility of wind induced damages in Norway spruce stands. 3. To characterize the survival of Norway spruce stands within the rotation period.
Supervisors of the doctoral thesis: senior researcher of LSFRI Silava Dr.silv Āris Jansons, consultant researcher of LSFRI Silava Mg.silv. Jānis Donis.
Summary of doctoral thesis here.

ILZE MATISONE's doctoral thesis "Dieback of common ash Fraxinus excelsior L. in Latvia: species succession and ash regeneration" was carried out in Latvian State Forest Research Institute "Silava". The doctoral studies were carried out at Latvia University of Life Sciences and Technologies in period from 2014–2020.
The aim of study was to assess the dieback dynamics of the common ash Fraxinus excelsior L. stands and determine the main factors affecting susceptibility of trees, as well as future succession and potential regeneration of the affected common ash stands in Latvia. The specific objectives of the thesis: 1. To assess regional differences in dynamics of ash dieback and their relationship with meteorological factors; 2. To determine the genetic diversity and population structure of common ash; 3. To characterise natural regeneration and succession of the affected ash stands of different age; 4. To identify site properties and management practices that affect regeneration and health condition of ash.
Supervisors of the doctoral thesis LSFRI Silava scientists: senior researcher Ph.D. Natālija Burņeviča, researcher Dr.biol. Roberts Matisons and senior researcher Dr.silv. Tālis Gaitnieks.
Summary of doctoral thesis here.

AGRIS ZIMELIS's doctoral thesis "Technology for extraction and transportation of coniferous stumps" was carried out at Latvian State Forest Research Institute "Silava". The doctoral studies were carried out at Latvia University of Life Sciences and Technologies in period from 2010 to 2020.
The aim of study was to develop the basis for technology allowing the processing and transportation of stump bio-fuelwood to landing sites in coniferous tree felling sites with minimum total used energy in the entire technological process. The specific objectives of the thesis: 1. To assess the potential resources of stump wood in JSC "Latvia’s state forests" coniferous tree felling sites; 2. To create the basis for technical requirements for the development of efficient design of the stump lifting technology; 3. To analyze opportunities to improve the energy balance of stump extraction, where a combination of stump extraction and soil scarification for the forest regeneration is considered; 4. To develop the technology for reducing energy consumption in stump biofuel production and transportation to a landing site.
Supervisor of the doctoral thesis: associated proffesor of Latvia University of Life Sciences and Technologies Dr.sc.ing. Ziedonis Sarmulis and senior researchers of LSFRI Silava Dr.silv. Andis Lazdiņš.
Summary of doctoral thesis here.

 

CONGRATULATIONS!

Published 05/01/2021 12:21:00

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