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A method to set up the phases of the tree growth in thickness based on dendrochronology of an English oak

100%

Golabek E., Tukiendorf A.

Electronic Journal of Polish Agricultural Universities. Series Environmental Development

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2004

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tom 07

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nr 2

In the paper we proposed a methodology to distinguish the phases of the tree growth in thickness of an English oak in the past century based on the ring chronology. We analyzed northern, eastern, southern and western tree ring increments using both the statistical modeling and a taxonomic method. Each step of the methodological procedure was described in the paper and the results were displayed graphically in line plots via a dendrogram and set in a table. To familiarize the Reader with the chosen methodology, some general notes over the approaches were added to the text. In the analysis, three phases of the tree thickness growth in the examined monumental English oak in the 20th century were set up statistically. The average-annual increments for these phases were calculated and plotted. The appropriateness of this technique for a practical use in dendrochronology was concluded finally and its wider application suggested.

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Teleconnection of 23 modern chronologies of Quercus robur and Q. petraea from Poland

80%

Ufnalski K.

Dendrobiology

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2006

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tom 55

51-56

Quercus robur and Q. petraea are important forest-forming species in Europe. Q. robur is believed to require more fertile soils, to be more tolerant to low temperatures and more sensitive to oak decline than Q. petraea. Thus chronologies of the two species from nearby localities were hypothesised to differ more strongly between species than between localities. Wood cores were collected on 23 research plots in 2 national parks and 12 forest districts. In each locality two plots (one with Q. robur and one with Q. petraea) were established in forest stands of similar age at similar site conditions wherever possible. Similarity between chronologies was assessed by the test of parallel agreement (Gleichlaufigkeit), Pearson correlation coefficients, and principal components. The plots were grouped by the Ward clustering method and according to 1st and 2nd principal components. The first 2 methods segregated chronologies nearly ideally into pairs of species from the same forest district, indicating that the chronologies differ between forest districts but not between species. Chronologies clustered in 2 large groups: northern and southern (on the basis of correlation) or northeastern and southwestern (on the basis of parallel agreement). Principal components also distinguished northeastern and southwestern chronologies, but less clearly. The results suggest that differences in climatic and soil requirements between the 2 oak species are generally too small in comparison with the differences caused by climatic factors.

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Temperature effects performance of Lymantria dispar larvae feeding on leaves of Quercus robur

80%

Karolewski P., Grzebyta J., Oleksyn J., Giertych M. J.

Dendrobiology

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2007

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tom 58

43-49

Future climatic warming may modifyinsect development, sex ratio, quantitative changes in populations that could affect the frequency of outbreaks. Here we analyzed the influence of temperature on larval growth and development in the gypsy moth (Lymantria dispar L.). The larvae were reared at three constant temperatures: 15, 20 or 25°C, and fed with leaves of the English oak (Quercus robur L.). Larval mortality, duration of development (DD), relative growth rate (RGR), total mass of food eaten (TFE), and pupal mass (PM) were estimated. Larval mortality was lowest at 20°C, higher at 25°C, and highest at 15°C. DD significantly decreased with increasing temperature and depended on sex. The influence of temperature on the shortening of DD was stronger in males than in females. RGR significantly depended on temperature and was the highest at 25°C, and lowest at 15°C. At 15°C, RGR did not change markedly with time. In contrast, RGR at 20°C was characterized bya continuous decreasing trend. At 25°C, RGR was very high for 2 weeks but quickly declined afterwards. Temperature did not affect the TFE. PM was significantly correlated with temperature and sex. PM of females was higher at 20°C than at 15 and 25°C, in contrast to that of males, which was similar at 20 and 25°C, and higher than at 15°C. For larval growth and development, the most favourable was the medium temperature (20°C). The least favourable temperature for females was 25°C, for males 15°C. The results suggest that global warming may modifythe future sex ratio of gypsy moths that may affect insect development and outbreaks.

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The growth ring structure effect on moisture content in green wood of English oak [Quercus robur L.] and Northern red oak [Quercus rubra L.]

80%

Raczkowski J., Helinska-Raczkowska L., Molinski W.

Folia Forestalia Polonica. Series B - Drzewnictwo

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2003

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nr 34

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Growth in thickness of monumental English oaks Quercus oobur, and their age, health status and dust fall in Bayesian approach

80%

Golabek E., Tukiendorf A.

Polish Journal of Environmental Studies

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2002

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tom 11

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nr 4

This paper presents an ecological analysis of the growth in thickness of monumental English oaks in relation to the age of trees, their health status, and dust fall in the immediate environment. The Bayesian modeling of empirical data was proposed via the MCMC technique ± known as Gibbs sampling in the BUGS software. The usefulness of the methodology, was accentuated in such ecological assessments.

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Effects of temperature on larval survival rate and duration of development in Lymantria monacha [L.] on needles of Pinus sylvestris [L.] and in L.Dispar [L.] on leaves of Quercus robur [L.]

80%

Koralewski P., Grzebyta J., Oleksyn J., Giertych M. J.

Polish Journal of Ecology

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2007

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tom 55

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nr 3

This study assessed the effects of temperature on survival rate and duration of development (DD), i.e., time needed by larvae to reach the pupal stage, in nun moth (Lymantria monacha L.) and gypsy moth (L. dispar L.). The larvae were raised at 15, 20 or 25°C, and fed with current-year-needles of Scots pine (Pinus sylvestris L.) and leaves of English oak (Quercus robur L.), respectively. With increasing temperature 15, 20 and 25°C, larval survival rate (LSR) declined in L. monacha (for 35th day LSR was 0.44, 0.31 and 0.21, respectively), but increased in L. dispar (0.50, 1.00 and 0.94). In contrast, the duration of development decreased with increasing temperature in larvae of both moth species (67, 52 and 39 days for L. monacha, and 66, 43 and 33 days for L. dispar, respectively). The differences in larval survival rate between those species at higher temperatures can affect significantly their growth and development in warmer years. Therefore, it is possible that under global climate change these differences may lead to changes in distribution of both insect species.

Ograniczanie wyników

2 Dendrobiology

1 Electronic Journal of Polish Agricultural Universities. Series Environmental Development

1 Folia Forestalia Polonica. Series B - Drzewnictwo

1 Polish Journal of Ecology

1 Polish Journal of Environmental Studies

2 Giertych M. J.

2 Golabek E.

2 Grzebyta J.

2 Oleksyn J.

2 Tukiendorf A.

1 Helinska-Raczkowska L.

1 Karolewski P.

1 Koralewski P.

1 Molinski W.

1 Raczkowski J.

1 Ufnalski K.

2 2007

1 2006

1 2004