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    Wyświetlanie 1-8 z 8
    Tytuł:
    Wplyw lubinu trwalego i sosny pospolitej na zmiany skladnikow odzywczych gleby lesnej
    Autorzy:
    Bieniaszewski, T
    Orzechowski, M
    Ziemblicki, R
    Sadej, W
    Powiązania:
    https://bibliotekanauki.pl/articles/794930.pdf
    Data publikacji:
    2006
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    kwasowosc gleby
    lubin trwaly
    gleby lesne
    uprawa roslin
    zawartosc skladnikow pokarmowych
    sosna zwyczajna
    soil acidity
    Lupinus polyphyllus
    forest soil
    plant cultivation
    nutrient content
    Scotch pine
    Pinus sylvestris
    Opis:
    Przeprowadzone badania z uprawą łubinu trwałego i sosny pospolitej wykazały, że uprawa tych roślin wpływa na nieznaczne obniżenie kwasowości gleby badanych obiektów. Jednocześnie porównanie składników odżywczych wykazało nieznaczny wzrost zawartości azotu ogółem, w szczególności w obiektach z łubinem oraz nieznaczny spadek zawartości przyswajalnych form fosforu. Większą zawartość azotu amonowego i azotanowego stwierdzono w glebie obiektów z sosną i łubinem. Zawartość potasu i magnezu niepodlegała wyraźnym zmianom. Nie stwierdzono wyraźnych zmian zawartości mikroskładników w glebie porównywanych obiektów po zakończeniu wegetacji roślin.
    The research carried out on long-standing lupine and a common pine showed that the cultivation of these plants causes a slight lowering of soil acidity on the studied objects. At the same time the comparison of nutritional components revealed a slight increase of total nitrogen content especially in soil with long-standing lupine, and a slightly decreased content of available forms of phosphorus. The larger content of ammonia and nitrate nitrogen was observed in soil of objects soil of after common pine and lupine. The contents of potassium and magnesium were not clearly changed. The clear changes of micro-component content were not noted in soil of compared objects after ending of those plants’ vegetation.
    Źródło:
    Zeszyty Problemowe Postępów Nauk Rolniczych; 2006, 513; 33-40
    0084-5477
    Pojawia się w:
    Zeszyty Problemowe Postępów Nauk Rolniczych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przewidywane oddziaływanie zmian klimatu na ekosystemy leśne oraz ich konsekwencje w urządzaniu lasu
    Expected impact of climate change on forest ecosystems and its consequences in forest management planning
    Autorzy:
    Borecki, T.
    Orzechowski, M.
    Stępień, E.
    Wójcik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/987172.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    ekosystemy lesne
    urzadzanie lasu
    czynniki klimatyczne
    oddzialywanie na las
    zmiany klimatyczne
    prognozowanie zagrozen
    wydzielanie sie drzew
    plan ciec
    climate change
    forest ecosystems response
    forest management planning
    Opis:
    The paper presents the assessment of possible impact of climate change on forest ecosystems in Poland and its consequences in the forest management planning. Scenarios of climate change in the twenty first century do not allow unambiguous determination of the rate and direction of these changes. However, it is believed that climate change could have negative economic con− sequences, which directly or indirectly will affect the deterioration of the environment. Analysis of the possible forms of the impact of climate change on forest ecosystems is particularly relevant in terms of growth conditions. The most noticeable consequences of the changes will concern the threat to the stability of forest stands resulting from the increase in the intensity of trees dieback caused by different factors. The phenomenon results, among others, from: the occurrence of new threats from biotic factors, including caused by secondary pests and the occurrence of alien species of flora and fauna, the severity of the impact of abiotic factors and the deterioration of health (especially of conifers). The increase in the intensity of the evolution of trees is directly related to the size of the cuts contingent and will lead to a blurring of the boundary between thinning and health−cutting. It is expected that the planned size of the cuts will be implemented mainly in the thinning and accidental cuts. This requires the modification of the perception of the rela− tionship of each category cuts. We propose the order and urgency in the planning of forest use. May be supposed that the role of the clearcutting system will be limited, with the exception of some forest complexes of predominantly productive functions, dominated by poor coniferous habitats. It is recommended to use the natural regeneration in the forest management. Lack of clear boundary between thinning and final cutting will require flexibility in the accounting for the total size of cuts. The consequences of climate change will probably occur in the long term perspective. It can therefore be assumed that reasonably forest management can help to reduce their negative effects. This requires pre−emptive decisions in forest management planning and verification for silviculture, production and protection targets, and their consistent implemen− tation.
    Źródło:
    Sylwan; 2017, 161, 07; 531-538
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Verification of the principles of accounting for the size of the allowable fellings in forest management planning
    Autorzy:
    Borecki, T.
    Stepien, E.
    Wojcik, R.
    Orzechowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/52369.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2016, 59, 197
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chromosome numbers and polyploidy in life forms of Asteraceae, Poaceae and Rosaceae in Polish flora
    Autorzy:
    Goralski, G.
    Bal, M.
    Gacek, P.
    Orzechowski, T.M.
    Kosecka-Wierzejska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/19303.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2014, 56, 1
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Drzewostany przejęte z Państwowego Funduszu Ziemi – stan i problemy zagospodarowania
    Forest stands acquired from the State Land Fund – the condition and management problems
    Autorzy:
    Kędziora, W.
    Orzechowski, M.
    Wójcik, R.
    Wrzosek, E.
    Borecki, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/985718.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    lasy prywatne
    grunty lesne
    przejmowanie gruntow
    zagospodarowanie lasu
    fragmentacja lasu
    Nadlesnictwo Siedlce
    Panstwowy Fundusz Ziemi
    private forests
    land transfer
    forest fragmentation
    Opis:
    In this paper, we present problems with the management of the forests acquired by the State Forests from the State Land Fund. This was particularly an issue in forest districts with a significant share of private forests, e.g. eastern part of Poland. The problem becomes more and more valid because of the latest amendment of the Forest Act in 2016. It gives the State Forests the right of the first purchase of private forests attributed to sale. They may receive forest stands that will generate specific economic problems related to care, conservation, felling maintenance, etc. These are mostly stands with typical features of private forests, resulting from abandoning economic operations, selective acquisition, as well as from the size, shape and neighbourhood of the plots. This study presents the characteristics of almost 2,000 tree stands acquired from the State Land Fund between 1992−2016 by the Siedlce Forest District (SFD), which is a part of the Regional Directorate of the State Forests in Warsaw. SFD has low forest cover (18%), a strong fragmentation of forest complexes and a very large share of private forests (over 75%). The analysis was based primarily on the descriptions of forest stands and the quantitative and qualitative characteristics, presenting at the same time the problems that SFD has with conducting rational forest management in acquired plots. The current status of the forests transferred from the State Land Fund was assessed as unsatisfactory. The main problems in local conditions are: (i) inadequate fixation in acquired parcels next to private forests (difficulty in locating treatments and custody over the State property), (ii) depleted tree stands, (iii) inadequate parcels (too narrow) and (iv) complications related to co−ownership of parts seized plots. The need to carry out joint−assembly works (mainly land consolidation) or to introduce land communities that would facilitate the management of these forests was demonstrated.
    Źródło:
    Sylwan; 2019, 163, 08; 665-674
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Regionalne zróżnicowanie potrzeb i pilności przebudowy drzewostanów
    Regional diversity of the need and the urgency of stands conversion
    Autorzy:
    Stępień, E.
    Kędziora, W.
    Orzechowski, M.
    Wójcik, R.
    Borecki, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/985680.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany
    przebudowa drzewostanow
    potrzeby przebudowy
    zroznicowanie regionalne
    regionalne dyrekcje Lasow Panstwowych
    stand classification
    regional heterogeneity
    conversion necessity
    state forests
    Opis:
    Nowadays in forestry, we observe an increase in threats that rise the uncertainty and risk of the forest management. This is caused, inter alia, by increasing intensity of forest and environmental damage as well as by the conflict of expectations for the use of forest resources. As a result, there is a problem of achieving the goals of sustainable development and adaptation of the forest ecosystems to new challenges. The aim of the presented study was to assess the regional variety of the need and the urgency of stands conversion. The feature was determined for all stands of the State Forests older than 20 years. Three assessment criteria were selected: (A) silvicultural target (compatibility of the species composition with the planned one), (B) stands stability (resultant from 5 auxiliary sub−indices), and (C) stock level (including 2 auxiliary sub−indices). The majority of stands has consistent species composition (over 60% in total), however only a small fraction of stands was found with a species composition incompatible with the planned one (average 6.34%). Stands with medium stability accounted for about 70%, while those with poor growing stock status make up about 70% of stands under analysis. The regional diversification of the needs for stands reconstruction seems to be strongly correlated with the incompatibility of stand’s species composition with habitat conditions. The largest fraction of stands requiring conversion was observed in Wrocław, Kraków and Katowice regional directorates of the State Forests. This situation may change in the future due to dynamic changes resulting from modifications of the climate and the deterioration of health condition of dominant Scots pine stands in central and north parts of Poland. Private forests were not taken into consideration in this research. It may impact the overall picture in regions of the high share of private forest ownership.
    Źródło:
    Sylwan; 2019, 163, 04; 267-278
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelowanie wielkości użytkowania rębnego drzewostanów w zależności od przyjętych metod prognozowania rozwoju lasu
    Modelling of the size of allowable cutting based on adopted methods of forest development forecast
    Autorzy:
    Szyc, K.
    Borecki, T.
    Stępień, E.
    Kędziora, W.
    Konieczny, A.
    Orzechowski, M.
    Wójcik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/979061.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    forestry use
    forest development
    modelling of usage regulation
    Opis:
    Many attempts have been made to develop a strategy for regulating forest use consistent with the multifunctional forest model. In this paper we present two proprietary methodologies of regulation of the allowable cutting size in a multifunctional forest in the 60−year time perspective. We assumed that all restrictions of nature protection and non−productive functions of the forest would still be in force. We based the first method on age class tables (TKW), which is faster but less exact in terms of spatial order of felling. The tree stand method (D−STAN) is based on stands spatial order and the cutting direction basis. In both cases, we based the temporal felling order on species rotation age. Comparing the results, we noticed that they present similar trends in the age structure of tree stands in younger age classes. The main discrepancies of the forecast concerns the share of forest stands in a complex structure: the TKW method gave approximately 12,4%, while the D−STAN one produced 5,1%. The latter approach shows that much smaller areas of stands are used for reconstruction. That marker is influenced by the spatial order of cutting used in the D−STAN model. In conclusion, we suggest to return to the big−area clear−cutting system on fresh coniferous habitats. Medium−area clear−cuttings should be brought back on the least fertile fresh mixed coniferous forests and possibly even fresh mixed deciduous forests.
    Źródło:
    Sylwan; 2020, 164, 04; 280-291
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photonic Liquid Crystal Fibers with Polymers
    Autorzy:
    Woliński, T.
    Tefelska, M.
    Mileńko, K.
    Siarkowska, A.
    Budaszewski, D.
    Domański, A.
    Ertman, S.
    Orzechowski, K.
    Rutkowska, K.
    Sierakowski, M.
    Nowinowski-Kruszelnicki, E.
    Dąbrowski, R.
    Mergo, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399416.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Df
    42.81.Wg
    02.60.Cb
    42.70.Qs
    Opis:
    Photonic liquid crystal fibers with polymers constitute a new solution based on liquid crystals and microstructured polymer optical fibers opening up new areas in innovative sensing and photonic devices applications. Compared with their silica-based microstructured fibers, it is easier to fabricate exotic microstructured polymer optical fibers by extrusion or drilling at low temperature; their nonlinearity is potentially stronger, the range of available polymers that may be drawn is more diverse and the biocompatibility of polymers is often better. Liquid crystals due to their attractive properties i.e., the high birefringence, high electro-optic and thermo-optic effects are a very good candidate for microstructured polymer optical fiber infiltration to obtain tunable all-in-fiber innovative photonic devices. The paper will discuss basic properties and possible applications of the polymer photonic liquid crystal fibers that will arise from their high optical tunability with external and internal factors. Current research effort is directed towards two main solutions: photonic crystal fibers and microstructured polymer optical fiber-based structures, both infiltrated with liquid crystals of tailored optical properties.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 613-616
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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