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Wyszukujesz frazę "Staniszewski, R" wg kryterium: Wszystkie pola


Wyświetlanie 1-3 z 3
Tytuł:
Zmienność dobowej wydajności i wybranych parametrów fizycznych soku brzozowego
Variability of daily productivity and selected physical parameters of birch sap
Autorzy:
Bilek, M.
Sosnowski, S.
Tomusiak, R.
Oktaba, J.
Staniszewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/985740.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
uboczne uzytkowanie lasu
lesne surowce niedrzewne
sok brzozowy
wydajnosc dobowa
wlasciwosci fizyczne
non−wood forest products
birch sap
birch syrup
physical properties
Opis:
The increasing social demand for food products collecting from the forests has beem observed currently. It should be assumed that one of the more and more important non−wood forest products in Poland is silver birch sap. Research in this area should concern not only the proper methods of its collection and yield, but also the rules of selecting forest stands and trees for its collection, as well in the context of protection of forest ecosystems, especially the quality of the obtained product and the safety of its consumption. The aim of this study was to examine the influence of air temperature on the daily volume of collected birch sap, determine the dependence of the volume of sap obtained on the selected physical parameters of the sap, as well as determine if there are changes in the values of the parameters tested as a function of time. It was not proved that the volume of the daily sap leak is related to the parameter of the refractive value, dry matter and electrolytical conductivity. It was found that the volume of the sap obtained is not significantly affected by the temperature on the day of the collection nor at the night immediately preceding the leak, while the relation between the intensity of the leak and thermal conditions several tens of hours earlier was indicated. Moreover, it was not shown that there was an optimal, determinable term in which birch sap is characterized by the most favorable parameters in terms of suitability for the production of birch syrup. It was also found that in the case of commercial birch sap harvesting on large scale, it is advisable to harvest and combine the sap from as many trees as possible. The necessity of further studies on the food and industrial usefulness of birch sap, including geographical, habitat and age variability of birch stands was underlined as well.
Źródło:
Sylwan; 2019, 163, 06; 443-451
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ wybranych czynników na zawartość składników mineralnych w soku brzozy brodawkowatej (Betula pendula Roth)
Influence of selected factors on the content of minerals in the silver birch (Betula pendula Roth) tree sap
Autorzy:
Staniszewski, P.
Bilek, M.
Szwerc, W.
Gostkowski, M.
Osiak, P.
Żurek, N.
Kocjan, R.
Powiązania:
https://bibliotekanauki.pl/articles/978941.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
non−wood forest products
silver birch sap
minerals
Opis:
The aim of this study was to determine the content of selected minerals in silver birch sap, and to examine whether the tree thickness (DBH), the obtained daily volume of sap and the date of collection have an impact on their content. The study was carried out in central−eastern Poland, in the Garwolin Forest District, in a stand with a dominant share of silver birch at the age of 65, which grows on a moist mixed broadleaved forest habitat type. Sap from the selected trees was taken after 24 hours of leakage, four times, at weekly intervals. In each case, the daily sap volume was measured and the content of zinc, copper, and manganese was determined. As a result, no effect of tree diameter on the content of the studied elements was found. However, a negative relationship was stated between copper content and daily sap volume. Moreover, birch sap was characterized by increasing concentration of zinc and copper over time. The obtained results of the determination of the content of minerals in birch sap testify to the fact that it is characterized by high nutritional value. However, the large variability in its composition means that in order to obtain such benefits it is necessary to combine sap taken from as many trees as possible, while sap collected from only one tree may have a negligible nutritional value.
Źródło:
Sylwan; 2020, 164, 05; 424-431
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zawartość wybranych metali ciężkich w soku brzozy brodawkowatej (Betula pendula Roth) oraz dobowa objętość pozyskanego soku w zależności od pierśnicy drzew
Content of heavy metals in the silver birch (Betula pendula Roth) tree sap and the daily volume of sap depending on tree diameter
Autorzy:
Staniszewski, P.
Bilek, M.
Szwerc, W.
Gostkowski, M.
Osiak, P.
Poleszak, J.
Kocjan, R.
Powiązania:
https://bibliotekanauki.pl/articles/978960.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
non−wood forest products
silver birch sap
daily leak
heavy metals
Opis:
The aim of this study was to determine the content of selected heavy metals in birch sap, and to examine whether the tree diameter, the obtained daily sap volume and the date of collection have an impact on their content. Moreover, it was decided to check whether the tree diameter could affect the intensity of the sap leak. The study was carried out in central−eastern Poland, in the Garwolin Forest District, in a stand with a dominant share of silver birch at the age of 65, which grows on a moist mixed broadleaved forest habitat type. Sap from the selected trees was taken after 24 hours of leakage, four times at weekly intervals. In each case, the daily sap volume was measured and the content of lead, nickel, chromium and cadmium was determined. No effect of tree diameter on the content of the studied elements was found. We also proved that the tree thickness had an impact on the daily sap volume. However, a negative relationship was stated between lead and cadmium content and daily sap volume. In turn, over time, birch sap was characterized by increasing concentration of lead and cadmium, while in the case of nickel downward trend was shown for two diameter classes. The obtained results of the determination of the con− tent of heavy metals in birch sap testify to the fact that for most of samples it is characterized by health safety. However, few exceedances of the most restrictive potable water as well as fruit juices and nectars standards are encountered, confirming the susceptibility of birch sap to heavy metal pollution. Therefore, in order to guarantee the safety of consumers, primarily it is necessary to select the collection points taking into account potential industrial and agricultural pollution and secondly – combining birch sap taken from as many trees as possible in order to average a very large variation in the content of heavy metals, both between individual trees and over time. It should also be noted that consum.
Źródło:
Sylwan; 2020, 164, 05; 432-440
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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