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1
Content available remote Tree rings of Norway Spruce (Picea abies (L.) Karsten) in Lithuania as drought indicators : dendroecological approach
100%
Vitas A.
Polish Journal of Ecology
|
2004
|
tom Vol. 52, nr 2
201-210
EN
Dendrological research on the radial growth of Norway spruce in Lithuania during the 20th century has been conducted. Hypothesis of the study is following: intensity of droughts during the 20th century is the main factor determining the state of spruce forests in Lithuania. Aim of the study was to estimate the impact of dry spring and summer climate conditions on Norway spruce during the 20th century with a respect to global climate change. Climate impact on the radial growth of spruce using multivariate regression techniques and detection of pointer years (i.e. years with narrow tree rings in the majority of trees) was investigated. The results show that for radial growth of spruce the most important factor is humid beginning of summer and that from four to six pointer years to droughts during the 20th century are attributed.
2
Interpopulation variation of individual tree response to pollution: evidence from Scots pine dendrochronological data
100%
Vitas A.
Polish Journal of Environmental Studies
|
2011
|
tom 20
|
nr 1
EN
The results of a dendrochronological investigation carried out on Scots pine (Pinus sylvestris L.) in the vicinity of JSC ‘Achema’ are presented. We found that pines sensitive and resistant to pollution exist in the population. Trees judged to be sensitive to pollution grew much faster in the period before the pollution occurred in comparison to resistant trees (p=0.00). We found that the dominant and codominant crown classes are more common among sensitive pines, while emergent crowns are twice as common among resistant trees. However, the differences are not statistically significant. We did not find an obvious difference between morphological bark forms of pines in respect to their sensitivity to pollution. The frequency of missing rings during the strongest depression period is much higher for sensitive pines (p=0.00).
3
Tree rings of Norway spruce [Picea abies [L.] Karsten] in Lithuania as drought indicators: dendroecological approach
100%
Vitas A.
Polish Journal of Ecology
|
2004
|
tom 52
|
nr 2
EN
Dendroecological research on the radial growth of Norway spruce in Lithuania during the 20th century has been conducted. Hypothesis of the study is following: intensity of droughts during the 20th cen- tury is the main factor determining the state of spruce forests in Lithuania. Aim of the study was to estimate the impact of dry spring and summer climate conditions on Norway spruce during the 20th century with a respect to global climate change. Climate impact on the radial growth of spruce using multivariate regression techniques and detection of pointer years (i.e. years with narrow tree rings in the majority of trees) was investigated. The results show that for radial growth of spruce the most important factor is humid beginning of summer and that from four to six pointer years to droughts during the 20th century are attributed.
4
Spontaneous regeneration of rhododendron plants: first evidence from Lithuania
63%
Sabunaite J. , Vitas A.
Polish Journal of Ecology
|
2013
|
tom 61
|
nr 1
EN
The spontaneous seedlings of Rhododendron luteum Sweet and Rhododendron calendulaceum (Michx.) Torr., Rhododendron maximum L., and Rhododendron japonicum Suringer were documented in Kaunas Botanical Garden of Vytautas Magnus University in 2006. More seedlings of these four rhododendron species were observed in 2007, 2008 and 2009. In 2010, altogether with aforementioned species, seedlings of Rhododendron dauricum L., Rhododendron schlippenbachii Maxim. and Rhododendron minus Michx were observed. The assessment of climatic conditions suggests that the self-regeneration of rhododendron genus plants was possibly provoked by global climate change – warmer winters and increased amount of precipitation in summers.
5
Content available remote Spontaneous regeneration of rhododendron plants: first evidence from Lithuania
63%
Šabūnaitè J. , Vitas A.
Polish Journal of Ecology
|
2013
|
tom Vol. 61, nr 1
171--174
EN
The spontaneous seedlings of Rhododendron luteum Sweet and Rhododendron calendulaceum (Michx.) Torr., Rhododendron maximum L., and Rhododendron japonicum Suringer were documented in Kaunas Botanical Garden of Vytautas Magnus University in 2006. More seedlings of these four rhododendron species were observed in 2007, 2008 and 2009. In 2010, altogether with aforementioned species, seedlings of Rhododendron dauricum L., Rhododendron schlippenbachii Maxim. and Rhododendronminus Michx were observed. The assessment of climatic conditions suggests that the self-regeneration of rhododendron genus plants was possibly provoked by global climate change – warmer winters and increased amount of precipitation in summers.
6
Content available remote Radiocarbon and dendrochronological dating of Sub-fossil oaks from Smarhoń riverine sediments
51%
Vitas A. , Mažeika J. , Petrošius R. , Pukienė R.
Geochronometria
|
2014
|
tom Vol. 41, no. 2
121-128
EN
Sub-fossil oaks from Smarhoń in Belarus have been investigated and tree-ring chronologies were assembled. According to radiocarbon dating, the oldest oak grew from 5782–5612 cal BC and the youngest from 1575–1747 cal AD. Radiocarbon and dendrochronological dating of 97 samples, four single series, 10 mean curves (containing 2–9 series) and three chronologies (10–25 series) were constructed. The longest chronology (No. 16), covering 549 years, was absolutely dated against various oak chronologies of Polish/Baltic origin to AD 778–1326. Germination and dying-off phases were assessed from the three best replicated chronologies.
7
Content available First records of Phytophthora spp. based on DNA analysis in Lithuania
45%
Vitas A. , Oszako T. , Nowakowska J. A. , Sikora K. , Stankeviciene A.
Folia Forestalia Polonica. Series A . Forestry
|
2012
|
tom 54
|
nr 1
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