EMU DSpace
Digitaalarhiiv EMU DSpace kogub, säilitab ja loob ligipääsu Eesti Maaülikooli liikmeskonna poolt loodud või Eesti Maaülikooli vastutusvaldkondadega seotud teadustöödele toetamaks maaülikooli konkurentsivõimet ja teadmistepõhist ühiskonna arengut. Digitaalarhiivi haldab Eesti Maaülikooli raamatukogu.
Valdkonnad DSpace's
Valige valdkond, et selle kogusid sirvida.
- Institute of Forestry and Engineering (MII)
- Institute of Agricultural and Environmental Sciences (PKI)
- Institute of Veterinary Medicine and Animal Sciences (VLI)
- Publications
- Units
Hiljutised sisestused
Multivariate analysis of the factors influencing soil organic carbon stock (0–30 cm) based on land use and its transitions in the Atlantic Forest Biome
(Estonian University of Life Sciences, 2026) Baker, A.A.P.D.; Da Silva, F.C.; Belém, A.L.
Soil organic carbon (SOC) stocks co‑vary with land use, land‑cover dynamics and their temporal transitions in human‑modified biomes such as the Atlantic Forest. This study explores how land‑use classes and their annual transitions help to understand the dynamics of SOC variability in the 0–30 cm layer using MapBiomas Soil data and Principal Component Analysis (PCA). This study analyzed total SOC stocks, the areal extent of major land uses (forest, pasture, agriculture, non‑vegetated areas, forestry plantations, hydrography and herbaceous vegetation), and their dominant transitions. Correlation analysis indicated positive associations between SOC and pasture, herbaceous vegetation and native forest, whereas agriculture, forestry plantations and non‑vegetated areas were negatively related to SOC stocks, in line with recent findings for Brazilian landscapes. In the PCA, the first component (PC1) captured most of the variance and was strongly associated with SOC and transitions between open and vegetated areas, representing a gradient linked to the intensity of landscape conversion. PC2 was mainly associated with transitions involving gains in forestry plantations, corresponding to a gradient of plantation expansion or contraction, while PC3 was associated with transitions affecting water bodies and wetlands, indicating a secondary axis of SOC variation. Overall, the results suggest that both current land use and the direction and intensity of land‑cover change are key factors associated with SOC stocks. These patterns are consistent with the importance of conserving vegetation cover and promoting stable, sustainable land management to maintain and enhance soil carbon in agricultural and natural environments across the Atlantic Forest biome.
Technological and methodological innovations in Estonian forest management: sonic tomography and dominant height modelling
(Estonian University of Life Sciences, 2026) Tarmu, Toomas; Laarmann, Diana (advisor); Kiviste, Andres (advisor); Institute of Forestry and Rural Engineering; Hynynen, Jari (opponent)
ABSTRACT. Advances in measurement technologies and modelling methods make it possible to assess forest growth and tree condition more accurately than before. In Estonian forest management, such developments should be gradually introduced into practical use. This doctoral thesis aimed to improve forest assessment methods in Estonia by developing dominant height-based site index models and by evaluating the usability of sonic tomography in forest management. The thesis was based on four studies using data from the Estonian Network of Forest Research Plots and separately collected measurements from Norway spruce stands. Paper I examined the effect of thinning on mean height and dominant height. Paper IV developed dominant height-based site index models for Scots pine, Norway spruce and birch stands. Paper II examined the reliability of sonic tomography for detecting internal decay in Norway spruce. Paper III assessed decay occurrence in relation to stand and site characteristics using sonic tomography. The results showed that dominant height is less affected by thinning than mean height and is therefore a more stable basis for site index modelling in managed stands. The site index models developed in Paper IV can be applied under Estonian conditions, but their use should remain within the age ranges and stand conditions supported by the ENFRP data. Paper II showed that sonic tomography can detect hidden stem decay in Norway spruce when decay affects sound transmission. Paper III further showed that decay was most extensive at the stem base and decreased with height. However, relationships between decay occurrence and spruce share, prior thinning and forest site type were not confirmed in this dataset. This may reflect study limitations. In practical forest assessment, the use of sonic tomography is limited by measurement time, equipment cost and the expertise required for tomogram interpretation.
Carbon fluxes and storages in Estonian coniferous and mixed stands and the effect of different harvesting methods on carbon sequestration
(Estonian University of Life Sciences, 2026) Sepaste, Agnes; Uri, Veiko (advisor); Kukumägi, Mai (advisor); Institute of Forestry and Rural Engineering; Huuskonen, Saija (opponent)
ABSTRACT. Forest management in Northern Europe has traditionally focused on even-aged coniferous stands. However, due to changing climate conditions, the management of mixed stands and the maintenance of continuous forest cover have received increasing attention. At the same time, knowledge regarding the production capacity and carbon (C) balance of mixed forests and forest managed under continuous-cover forestry remains relatively limited.
The biometric C budgeting approach was used to examine C cycling in the studied chronosequences and to evaluate the effect of different management methods on ecosystem C balance.
Both mixed silver birch–Norway spruce stands as well as pure Norway spruce stands demonstrated considerable C sinks potential, with net ecosystem production (NEP) values ranging from 1.2 to 7 t C ha⁻¹ yr⁻¹ across studied chronosequences. In both dataset current annual production peaked in middle-aged stages. The net primary production (NPP) of trees served as the main driver of dynamics of C sequestration, while soil heterotrophic respiration remained relatively stable across the successional gradient of the stands. However, the average C stock per age class accumulated in the trees was higher in pure stands than in mixed forests, at 142.5 and 97.5 t C ha⁻¹ respectively.
The short-term effects of clear-cutting versus transitional selection cutting on NEP were evaluated in mature Scots pine stands. Although the applied partial harvesting in mature Scots pine stands reduced annual NPP by 20–40%, thinned stands remained C neutral or acted as C sinks, annual NEP values varied between -0.2 and 1.9 t C ha-1 yr-1. Clear-cut areas acted as C sources with annual C loss at -2.4 to -4.1 t C ha-1 yr-1.
These findings demonstrate that both stand composition and management practices influence forest C dynamics and should be considered in climate-smart forest management strategies.
Soil Sealing in Estonia: Reference Assessment and Yard-Level Omission Data
(Estonian University of Life Sciences, 2026) Metsoja, Kärt; Kall, Tarmo; Liba, Natalja; Jürgenson, Evelin
This dataset supports the study “Estimating Soil Sealing in Estonia: Copernicus, National Data, and Reference-Based Assessment”. The study compared European and national spatial datasets used for soil sealing monitoring in Estonia, including CLC+ Backbone, Imperviousness Density, the European Soil Sealing Index, and a proxy derived from the Estonian Topographic Database.
Lintprinter tehnoloogia integreerimine emü 3d printimise laborisse
(Eesti Maaülikool, 2026) Joosua, Deivid; Soots, Kaarel (juhendaja); Virro, Indrek (juhendaja); Biomajandustehnoloogiate õppetool
3D-printimise tehnoloogia on viimastel aastatel kiiresti arenenud, sealhulgas on loodud
lintprinterid, mis võimaldavad printida liikuvatele konveierlintidele. Eesti Maaülikooli
soetatud Ideaformer IR3V2 lintprinteril ilmnesid puudused, mis takistasid seadme
mugavat kasutamist õppetöös. Käesoleva lõputöö eesmärk on nimetatud printeri
integreerimine laborikeskkonda, töökindluse ja kasutusmugavuse tõstmine ning
tootmisvõimekuse parendamine. Töö käigus korrigeeriti töölaua tasapinda, parendati
pooli kinnitust ja seadistati võrguühendus. Lisaks loodi veebikaamera statiiv ja viidi läbi
testprintimised. Töö tulemused näitasid, et lintprinter sobib väikeseeriate ja mõõtmetelt
piiratud detailide tootmiseks ning on kasutatav ka pikemate detailide printimiseks, kui
prinditava detaili orientatsioon, materjal ja printimisparameetrid on sobivalt valitud.