Zmienność dobowej wydajności i wybranych parametrów fizycznych soku brzozowego
| Autor: | Bilek, Maciej, Sosnowski, Stanisław, Tomusiak, Robert, Oktaba, Jarosław, Staniszewski, Paweł |
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| Jazyk: | polština |
| Rok vydání: | 2019 |
| Předmět: | |
| DOI: | 10.26202/sylwan.2018165 |
| Popis: | 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. Sylwan 163 (6): 443-451 |
| Databáze: | OpenAIRE |
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