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1

Influence of mechanical damage on the condition of trees

100%
Kosmala M., Roslon-Szerynska E., Suchocka M.
Annals of Warsaw University of Life Sciences - SGGW. Horticulture and Landscape Architecture
|
2008
|
tom 29
2

The usefulness of some selected methods of street trees condition assessment used as the basis for their evaluation in the urban area

84%
Roslon-Szerynska E., Czarnowska A.
Annals of Warsaw University of Life Sciences - SGGW. Horticulture and Landscape Architecture
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2010
|
tom 31
3

The preliminary assessment of phenological reactions of selected tree species exposed to long-lasting stress in construction areas

84%
Suchocka M.
Annals of Warsaw University of Life Sciences - SGGW. Horticulture and Landscape Architecture
|
2008
|
tom 29
4

Evaluation of oak tree conditions on the basis of losses in the assimilation aparatus of selected oak stands in Sulecin Forest District

84%
Szewczyk W., Dudek M., Baranowska M.
Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria
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2011
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tom 10
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nr 3
Oak trees play a significant naturalistic and economic role. Common oaks represent the most valuable forest-creating species in Poland. In the recent years, on the area of the whole country, one can observe a visible deterioration of the health conditions in oak tree stands. It is difficult to indicate the main factor responsible for this phenomenon. Because of the wide range of this observation, it can be assumed that this process is caused by many biotic and abiotic, as well as anthropogenic factors. Studies were out in the Sulęcin Forest District. At the turn of July and August in the years 2009 and 2010, an assessment of the losses in the majority of trees showed a medium degree (49%). Another group of trees showed 36% of leaf loss, while 14% of oak trees did not show any losses at all. A very high degree of defoliation was found only in 1% of trees. The presented data indicate that an average loss in the assimilation apparatus of oak trees amounted to 29.15%.
5
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The influence of variability of water resources in lowland forests on selected parameters describing the condition of trees

67%
Tyszka J., Stolarek A., Fronczak E.
Papers on Global Change
|
2014
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nr 21
The influence of water conditions on the condition and growth of tree stands has been analysed in the context of the climatic and hydrological functions forest plays. Long observational series obtained for precipitation, outflow and depths below the surface of the water table have been put together with measured increases in the breast-height diameters of Scots pines and the severity of crown defoliation observable in selected tree species growing on the Polish Lowland, in order to determine the overall scope to the reaction stand condition manifests in the face of ongoing variability of water conditions within forest. An overall improvement in the condition of stands over the last 20 years does not disguise several-year cyclicity to changes capable of shaping the situation, i.a. departures from long-term mean values for precipitation totals and groundwater levels. The condition of stands is seen to worsen in both dry and wet years. Analysis of the degree to which pine, spruce and broadleaved stands experience defoliation points to spruce stands responding most to extreme hydro-climatic conditions. Extreme situations as regards water resources were seen to involve a response over two-year time intervals in the case of coniferous stands. Unsurprisingly, optimal growing-season (June-September) precipitation totals correspond with long-term average figures, while being slightly higher for spruce (at 384 mm), than for Scots pine or broadleaved species (375 mm). The relationships reported gain confirmation in analysis of periodic change in breast-height diameter increments characterising Scots pines, whose growth is seen to depend closely, not only on precipitation, but also above all on the depth of the water table in the summer half-year. Optimal depths of the water table proved to be different, being around 20 cm below ground in the case of marshy coniferous forest, 80 cm in wet habitats, and 135 cm in fresh habitats. Depending on the possibilities for water to soak into the rooting zone of trees there were even twofold differences in measured growth increments in Scots pine (as the dominant species in Poland’s lowland habitats). The maintenance of stable water conditions (as the most variable environmental factor in forest) should be an overriding aim of management activity in this habitat. When account is taken of the influence of the state of water resources on biomass production, and then on the intensity of evapotranspiration and the absorption of carbon dioxide from the atmosphere, it is seen how important it is to achieve improvements in water conditions in forests, as such an important factor in combating climate change.
6
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Health condition of Norway spruce Picea abies (L.) Karst. stands in the Beskid Mts

59%
Holusa J.
Dendrobiology
|
2004
|
tom 51 Supplement
The health condition of spruce stands in the Moravian-Silesian Beskids is affected by several predisposition factors, the most important of which is the allochthonous character of spruce grown on improper sites. When exposed to a low supply of nutrients and intensive mechanical damage mainly by game, the trees are susceptible to rot infestations, climatic agents and mechanical destruction by snow, hard rime and wind. At present, air pollution does not show any significant impact on the spruce stands; it rather acts as a less important predisposition factor on mountain peaks. The physiological condition of trees is not impaired to the extent which would facilitate infestation with phytophagous or cambioxylophagous insects.
7

Diagnozowanie kondycji drzew z wykorzystaniem tomografii komputerowej

51%
Durlak W., Dudkiewicz M., Pudelska K., Dabski M.
Acta Scientiarum Polonorum. Formatio Circumiectus
|
2017
|
tom 16
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nr 2
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