Wyniki wyszukiwania - Biblioteka Nauki

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Growth responses of sessile oak to climate and hydrological regime in the Zbytka Nature Reserve, Czech Republic

100%

Čejková A. , Poláková S.

Geochronometria

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2012

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tom Vol. 39, no. 4

285-294

EN

Complex of Nature reservation Zbytka is the rest of various fen vegetation in the northeast part of the Czech Republic. It represents an important spring area which provides high quality potable water for more than 150 000 inhabitants. Waterworks utilization was started in the 1960s and the change of land-use practices has had a strong effect on the ecosystem. Oak chronology has been showing different tree growth trends since the start of the waterworks utilization. Also the occurrenc-es of negative pointer years differ markedly before and after initiation of pumping underground water. Dendroclimatological analyses primarily revealed a close relationship between the temperature and tree growth - positive influence of spring and summer temperature. The period 1983-1992 of maxi-mum artesian water pumping is expressed as higher tree-ring increments, but linear model analyses showed that the growth reaction of oak is not due to simple causality between temperature and under-ground water level. The radial increments reacted positively to the combination of high temperature during the vegetation season and low or, the contrary, high depth of underground water level. No di-rect relationship was detected between tree growth and fluctuation of underground water level; de-spite of the results dendrochronological data may be useful in historical ground water modelling stud-ies. Results are also crucial for conflict of interests between nature preservation and potable water supply.

2

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

63%

Szewczyk W. , Dudek M. , Baranowska M.

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tom 10

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nr 3

EN

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%.

PL

Dęby mają duże znaczenie gospodarcze i przyrodnicze. Dąb szypułkowy jest najcenniejszym gatunkiem lasotwórczym w Polsce. W ostatnich latach na terenie całego kraju obserwujemy widoczne pogorszenie kondycji zdrowotnej drzewostanów dębowych. Trudno jest znaleźć jeden główny czynnik odpowiedzialny za to zjawisko. Ze względu na tak szeroki zasięg jego występowania przyjmuje się, że na ten proces składa się wiele czynników abiotycznych, biotycznych oraz antropogenicznych. Badania zostały przeprowadzone w Nadleśnictwie Sulęcin. Na przełomie lipca i sierpnia w 2009 oraz 2010 roku przeprowadzono ocenę ubytku aparatu asymilacyjnego dębów. Analiza stanu zdrowotnego dębów wykazała, że w większości drzewa były w średnim stopniu defoliacji - 49%, następnie 36% stanowiły drzewa z lekką defoliacją, 14% drzew nie wykazało uszkodzeń, natomiast 1% obejmuje drzewa z dużą defoliacją. Z przedstawionych danych wynika, że średnia wartość ubytku aparatu asymilacyjnego to 29,15%.

3

Oak bark share at different heights of stem

63%

Karaszewski Z. , Bembenek M. , Giefing D. F. , Szczepanska Alvarez A. , Maderski P. S.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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2014

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tom 86

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The content of heavy metals in the wood of healthy and dying oak trees [Quercus robur L., Q. petraea [Matt.] Liebl.]

51%

Szczepkowski A. , Nicewicz D.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2008

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tom 07

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nr 4

55-65

5

Fluoride content and epicuticular wax condition in pedunculate oak tree [Quercus robur L.] leaves

51%

Rosa J. , Bacic T.

Acta Biologica Cracoviensia. Series Botanica

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2000

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tom 42

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nr 1

EN

Fluoride content and epicuticular wax condition in pedunculate oak tree leaves from a natural forest near a phosphogypsum dump and from a planted stand 2 km away from the dump (control) were investigated. The study indicated considerable differences in these parameters between the two localities. Increased fluoride content, accompanied by earlier and accelerated degradation of epicuticular crystalline wax on the stomatal rim of abaxial epidermis was observed in leaves from the first locality, and the most advanced stage of wax degradation was recorded only in the leaves from this site. The accelerated alterations are interpreted as possible negative effects of fluorides.

6

Materiały do znajomości żądłówek (Hymenoptera: Apocrita: Aculeata) występujących w drzewostanach dębowych

32%

Celary W. , Plewa R.

Wiadomości Entomologiczne

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2014

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tom 33

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nr 1

EN

The paper presents data on 24 species of aculeate visiting crowns of oaks. 18 of them are new for those specific tree stands.