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Articles by Āris Jansons

Category : Research article

article id 24046, category Research article
Līga Liepa, Zigmārs Rendenieks, Edgars Dubrovskis, Lāsma Freimane, Inga Straupe, Āris Jansons. (2025). Patterns of short-term vegetation recovery after a fire in protected Scots pine forests of hemiboreal Latvia. Silva Fennica vol. 59 no. 1 article id 24046. https://doi.org/10.14214/sf.24046
Keywords: succession; fire disturbance; plant functional traits; post-fire regeneration; protected forests
Highlights: We observed more rapid vegetation recovery at the ground level, but the dominance increased more steadily at herb and tree layers; We found the highest species diversity at the herb layer during the third (middle-aged stands) and fourth (over-mature stands) years after fire disturbance; From regenerating tree species, only Populus tremula in over-mature stands showed a decline in projective cover during the four studied years.
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article id 23040, category Research article
Jānis Liepiņš, Ieva Jaunslaviete, Kaspars Liepiņš, Līga Jansone, Roberts Matisons, Andis Lazdiņš, Āris Jansons. (2023). Effect of stem rot on wood basic density, carbon, and nitrogen content of living deciduous trees in hemiboreal forests. Silva Fennica vol. 57 no. 3 article id 23040. https://doi.org/10.14214/sf.23040
Keywords: wood specific gravity; birch; climate change mitigation; biomass estimation; alder; aspen; wood decay
Highlights: Stem rot significantly reduces the basic density of wood and increases its nitrogen content in living deciduous trees, while the carbon content appears irresponsive; The effect of the distance from the pith on the basic density and nitrogen content of wood varies, depending on presence of discoloration or decomposition in the wood.
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article id 10483, category Research article
Māra Kitenberga, Guntars Šņepsts, Jānis Vuguls, Didzis Elferts, Ieva Jaunslaviete, Āris Jansons. (2021). Tree- and stand-scale factors shape the probability of wind damage to birch in hemiboreal forests. Silva Fennica vol. 55 no. 2 article id 10483. https://doi.org/10.14214/sf.10483
Keywords: stem breakage; Betula pendula; snapping height; stem damage; stem fracture; tree stability
Highlights: Prior stem and root damage significantly increased the probability of birch being wind-damaged; Trees with a high slenderness ratio had a lower relative snapping height; The snapping height was significantly negatively affected by the prior stem and root damage.
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article id 10334, category Research article
Annija Kārkliņa, Guntis Brūmelis, Iluta Dauškane, Didzis Elferts, Lāsma Freimane, Māra Kitenberga, Zane Lībiete, Roberts Matisons, Āris Jansons. (2020). Effect of salvage-logging on post-fire tree establishment and ground cover vegetation in semi-natural hemiboreal forests. Silva Fennica vol. 54 no. 5 article id 10334. https://doi.org/10.14214/sf.10334
Keywords: management; forest fire; natural disturbance; legacies; understory vegetation
Highlights: Effect of salvage logging on post-fire understory vegetation was assessed; Effect of salvage logging differed depending on forest types; In dry-poor stands, Calluna vulgaris was hindering other plant species; In wet stands, logging had positive effect on understory vegetation diversity; Salvage logging enhanced the effect of natural disturbance in dry-rich stands.
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article id 10276, category Research article
Adas Marčiulynas, Vaida Sirgedaitė-Šėžienė, Povilas Žemaitis, Āris Jansons, Virgilijus Baliuckas. (2020). Resistance of Scots pine half-sib families to Heterobasidion annosum in progeny field trials. Silva Fennica vol. 54 no. 4 article id 10276. https://doi.org/10.14214/sf.10276
Keywords: Pinus sylvestris; field trials; half-sib families; root rot pathogen; total phenolic compounds; tree susceptibility
Highlights: Large genetic variation was estimated in the resistance of Scots pine half-sib families to root rot in field trials; A strong relationship was observed between family resistance to root rot and phenolic compound concentration in the wood.
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article id 10220, category Research article
Arnis Gailis, Pauls Zeltiņš, Andis Purviņš, Juris Augustovs, Valts Vīndedzis, Inga Zariņa, Āris Jansons. (2020). Genetic parameters of growth and quality traits in open-pollinated silver birch progeny tests. Silva Fennica vol. 54 no. 2 article id 10220. https://doi.org/10.14214/sf.10220
Keywords: Betula pendula; tree breeding; genetic gain; genetic parameters
Highlights: Growth and stem quality traits were under strong genetic control; Weak genetic correlations between tree growth and stem quality were found; Strong age-age and type-B correlations suggest robust improvement over time and different environments; Simultaneous improvement of growth and stem quality might be applicable.
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article id 7746, category Research article
Jānis Donis, Māra Kitenberga, Guntars Šņepsts, Roberts Matisons, Juris Zariņš, Āris Jansons. (2017). The forest fire regime in Latvia during 1922–2014. Silva Fennica vol. 51 no. 5 article id 7746. https://doi.org/10.14214/sf.7746
Keywords: forest disturbance; fire regime; hemiboreal zone; spatial analysis
Highlights: Climate effects and human influence on forest fire activity in Latvia was assessed using time-series analysis; Drought conditions during summer season had the strongest effect on fire activity of tested climatic variables; Negative trends and spatial distribution pattern of fire activity suggests of prevailing human influence on forest fire regime over the 20th century.
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article id 1442, category Research article
Silva Šēnhofa, Mārtiņš Zeps, Roberts Matisons, Jānis Smilga, Dagnija Lazdiņa, Āris Jansons. (2015). Effect of climatic factors on tree-ring width of Populus hybrids in Latvia. Silva Fennica vol. 50 no. 1 article id 1442. https://doi.org/10.14214/sf.1442
Keywords: dendroclimatology; hybrid aspen; hybrid poplar; fast-growing hybrids; weather conditions
Highlights: Hybrid poplar and hybrid aspen were sensitive to temperature in summer and dormant periods, but none of the tested factors were strictly limiting; Hybrid poplar was sensitive to a higher number of climatic factors than hybrid aspen; Temperature showed a negative correlation with tree-ring width.
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article id 1391, category Research article
Roberts Matisons, Jānis Jansons, Juris Katrevičs, Āris Jansons. (2015). Relation of tree-ring width and earlywood vessel size of alien Quercus rubra L. with climatic factors in Latvia. Silva Fennica vol. 49 no. 4 article id 1391. https://doi.org/10.14214/sf.1391
Keywords: dendroclimatology; climate-growth relationships; introduced species; earlywood vessel lumen area; wood anatomy; shifting sensitivity
Highlights: Climate-growth relationships of red oak from three sites in Latvia were studied; Tree-ring width was mainly affected by temperature and precipitation in late summer; Vessel size was correlated with temperature parameters in autumn–spring; Sets of climatic factors significant for growth of red oak differed between sites; Changes in climate-growth relationships occurred during 20th century.
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article id 1262, category Research article
Āris Jansons, Roberts Matisons, Māra Zadiņa, Linards Sisenis, Jānis Jansons. (2015). The effect of climatic factors on height increment of Scots pine in sites differing by continentality in Latvia. Silva Fennica vol. 49 no. 3 article id 1262. https://doi.org/10.14214/sf.1262
Keywords: Pinus sylvestris; dendroecology; height growth reconstruction; meteorological conditions; Baltic region; increment variation
Highlights: Height increment-climate relationships of Scots pine were assessed using dendrochronological techniques; Annual height increment was significantly affected by climatic factors; In western Latvia, temperature in preceding summer mainly affected height increment; In eastern Latvia height increment was affected by previous autumn temperature; During the 20th century, the effect of climatic factors has altered likely dues to climate change.
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article id 1124, category Research article
Āris Jansons, Mārtiņš Zeps, Juris Rieksts-Riekstiņš, Roberts Matisons, Oskars Krišāns. (2014). Height increment of hybrid aspen Populus tremuloides x P. tremula as a function of weather conditions in central part of Latvia. Silva Fennica vol. 48 no. 5 article id 1124. https://doi.org/10.14214/sf.1124
Keywords: height growth; energy wood; tree growth; temperature; intra-annual dynamics; plantation silviculture
Highlights: Intra-annual height growth of hybrid aspen was monitored; Clones with early leaf flushing dates showed faster height growth; Height growth was generally controlled by temperature; Fast-growing hybrids were more robust to weather conditions than slow-growing ones; Potential evapotranspiration (moisture regime) negatively affected height growth of clones with delayed phenology.
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Category : Research note

article id 10524, category Research note
Arnis Gailis, Pauls Zeltiņš, Roberts Matisons, Andis Purviņš, Juris Augustovs, Valts Vīndedzis, Āris Jansons. (2021). Local adaptation of phenotypic stem traits distinguishes two provenance regions of silver birch in Latvia. Silva Fennica vol. 55 no. 2 article id 10524. https://doi.org/10.14214/sf.10524
Keywords: Betula pendula; population genetics; genetic parameters; climate-smart forestry; phenotypic traits
Highlights: Two provenance subregions in Latvia – coastal and inland – were distinguished; Silver birch populations in inland region possessed better growth, higher heritability, and phenotypic plasticity; Moderate to high heritability for stem quality was estimated in both regions; Silver birch from inland region possesses higher potential for improvement of adaptability.
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article id 10014, category Research note
Āris Jansons, Roberts Matisons, Virgilijus Baliuckas, Līga Purina, Oskars Krišāns, Jānis Jansons, Imants Baumanis. (2018). Performance variation of lodgepole pine provenances in Latvia. Silva Fennica vol. 52 no. 5 article id 10014. https://doi.org/10.14214/sf.10014
Keywords: provenance trial; Pinus contorta var. latifolia; growth traits; transfer; spike knots
Highlights: Performance of 36 provenances of lodgepole pine in 14 trials was studied; The 29 year survival was ca. 40%; Provenance and provenance × trial interaction affected dimensions of lodgepole pine; Provenances from lower latitudes were the most productive.
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article id 10009, category Research note
Jānis Donis, Māra Kitenberga, Guntars Šņepsts, Edgars Dubrovskis, Āris Jansons. (2018). Factors affecting windstorm damage at the stand level in hemiboreal forests in Latvia: case study of 2005 winter storm. Silva Fennica vol. 52 no. 4 article id 10009. https://doi.org/10.14214/sf.10009
Keywords: Norway spruce; natural disturbance; windstorm; hemiboreal
Highlights: In hemiboreal forests in Latvia, dominant tree species, admixture of spruce in canopy-layer, mean height, timing of thinnings, upwind forest edges and wind gusts had significant effect on windstorm damage occurrence at stand-level; Stands on peat soils were more damaged than stands on mineral soils; Tree species composition of canopy-layer was not statistically significant in the model.
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article id 9899, category Research note
Linda Robalte, Diāna Jansone, Didzis Elferts, Roberts Matisons, Āris Jansons. (2018). Bilberry ramet dimensions in relation to stand age in oligotrophic conditions in Latvia. Silva Fennica vol. 52 no. 1 article id 9899. https://doi.org/10.14214/sf.9899
Keywords: structural diversity; Vaccinium myrtillus; dwarf shrubs; projective cover; hemiboreal forests
Highlights: Bilberry ramet dimensions (age, diameter, height) and their structural diversity, as well as cover, increased with stand age; Active rejuvenation of ramets was observed in younger stands; The oldest bilberry ramets (>10 years of age) occurred in stands older than 70 years.
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article id 7818, category Research note
Roberts Matisons, Guntars Šņepsts, Līga Puriņa, Jānis Donis, Āris Jansons. (2018). Dominant height growth of European beech at the northeasternmost stands in Europe. Silva Fennica vol. 52 no. 1 article id 7818. https://doi.org/10.14214/sf.7818
Keywords: site index; Fagus sylvatica; generalized algebraic difference approach; height models
Highlights: The dominant height growth of the introduced European beech was modelled using the generalised algebraic difference approach; The Chapman-Richards and Sloboda models showed the best fit to the data; Height growth of the second generation trees exceeded the first generation trees; In the western part of Latvia, height growth of beech exceeded that in southern Sweden.
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article id 7771, category Research note
Māra Kitenberga, Roberts Matisons, Āris Jansons, Jānis Donis. (2018). Teleconnection between the Atlantic sea surface temperature and forest fires in Latvia and Estonia. Silva Fennica vol. 52 no. 1 article id 7771. https://doi.org/10.14214/sf.7771
Keywords: disturbance regime; Atmospheric circulation; weather systems; fire meteorology
Highlights: Forest fire activity in Latvia and Estonia was related to conditions in the Atlantic; Teleconnections differed regionally; Negative correlation between number of fires in Estonia and SST in the North Atlantic was detected; Area of forest fires in Estonia and activity of fires in Latvia were positively correlated with SST in the Baltic, North and Mediterranean Seas in summer.
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article id 1661, category Research note
Āris Jansons, Linda Robalte, Roberts Čakšs, Roberts Matisons. (2016). Long-term effect of whole tree biomass harvesting on ground cover vegetation in a dry Scots pine stand. Silva Fennica vol. 50 no. 5 article id 1661. https://doi.org/10.14214/sf.1661
Keywords: Pinus sylvestris; soil disturbance; stand replacement; Latvia; biomass removal; soil scarification
Highlights: After 47 years, whole tree harvesting (WTH) increased richness of ground cover species compared to conventionally managed stands; Higher occurrence of the oligotrophic species after WTH suggested reduction of soil nutrient content, hence formation of different plant community; WTH, apparently, facilitated recovery of species typical for later successional stages.
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article id 1656, category Research note
Līga Puriņa, Roberts Matisons, Āris Jansons, Silva Šēnhofa. (2016). Survival of European beech in the central part of Latvia 33 years since the plantation. Silva Fennica vol. 50 no. 4 article id 1656. https://doi.org/10.14214/sf.1656
Keywords: Fagus sylvatica; introduction experiment; sapling mortality; northeasternmost beech trial
Highlights: Beech saplings growing in the central part of Latvia had ca. 80% survival during the recent three decades; The dimensions of saplings varied greatly likely due to canopy conditions; Some beech self-regeneration was observed; Mainly saplings had narrow crowns; The distribution of sapling dimensions had the reverse-J shape, suggesting successful development of beech.
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article id 1346, category Research note
Āris Jansons, Roberts Matisons, Oskars Krišāns, Baiba Džeriņa, Mārtiņš Zeps. (2015). Effect of initial fertilization on 34-year increment and wood properties of Norway spruce in Latvia. Silva Fennica vol. 50 no. 1 article id 1346. https://doi.org/10.14214/sf.1346
Keywords: Picea abies; wood density; proportion of latewood; tree-rings; high-frequency densitometry; legacy effect
Highlights: The initial fertilization increased the productivity of Picea abies increasing stem volume by 17% at the age of 34 years; The tree-ring width was affected for up to15 years; The fertilization did not affect mean tree-ring density, although the latewood density was increased.
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article id 1255, category Research note
Āris Jansons, Roberts Matisons, Līga Puriņa, Una Neimane, Jānis Jansons. (2015). Relationships between climatic variables and tree-ring width of European beech and European larch growing outside of their natural distribution area. Silva Fennica vol. 49 no. 1 article id 1255. https://doi.org/10.14214/sf.1255
Keywords: Fagus sylvatica; introduced species; wood increment; climatic limitation; Latvia; Larix decidua
Highlights: In western Latvia, variation of tree-ring width of European beech and European larch within stands was similar; Dry summers and cold winters caused common event years in tree-rings; Moisture availability at the end of summer was apparently the main limiting factor for tree-ring width; Winter and spring temperature did not have significant and lasting effect on variation of tree-ring width.
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