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    Wyświetlanie 1-6 z 6
    Tytuł:
    Użytkowanie lasów w Indonezji
    Forest utilization in Indonesia
    Autorzy:
    Sieniawski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/973913.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    Indonezja
    lasy
    leśnictwo
    użytkowanie lasu
    gospodarka leśna
    forest utilization
    indonesia
    forest utilization concession
    Opis:
    Covering 133.7 mln ha of area, forests of Indonesia are an important part of world’s forest resources. In terms of size, they are one of the largest rainforest in the world. So far, 5014 tree species has been classified there. The dominant species include Shorea sp., Litsea sp., Dipterocarpus sp., Calophyllum sp., Eugenia spp., Payena sp., Vaticano sp. and Palaquium sp. Forest utilization model is based on the concessions, allowing for the commercial exploitation of forest resources. Since independence in 1945, forest utilization policy has changed many times. Not only administration was changing, but also the level of administrative authority, where the major decisions for forest policy were undertaken. All these changes significantly imprinted on the current situation in Indonesian forestry and lifestyle of people dependent on forests.
    Źródło:
    Sylwan; 2011, 155, 04; 279-288
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza wydajności zrywki drewna w drzewostanach bukowych
    The efficiency analysis of skidding and forwarding in beech stands
    Autorzy:
    Sieniawski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1009738.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany bukowe
    zrywka drewna
    wydajnosc pracy
    lesnictwo
    pozyskiwanie drewna
    beech
    efficiency
    harvesting
    skidding
    forwarding
    Opis:
    The purpose of research was to analyse the efficiency of skidding and forwarding as well as relationships between these stages in beech stand. The large−sized wood was dragged by LKT 120 skidder, while middle−sized wood was loaded on trailer with tractor URSUS C330. The regression equations for determination of skidding cycle time and daily skidding efficiency were worked out. Average skidding efficiency amounted 21,99 m3/8 lh (labour hours) for large−sized and 15,68 m3/8 lh for middle−sized wood.
    Źródło:
    Sylwan; 2009, 153, 07; 466-471
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zrównoważony łańcuch dostaw drewna na przykładzie wybranego zakładu
    Autorzy:
    Sieniawski, W.
    Porter, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/881220.pdf
    Data publikacji:
    2012
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Leśny Zakład Doświadczalny. Centrum Edukacji Przyrodniczo-Leśnej w Rogowie
    Źródło:
    Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej; 2012, 14, 3[32]
    1509-1414
    Pojawia się w:
    Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of timber loads on gross vehicle weight
    Autorzy:
    Trzcinski, G.
    Sieniawski, W.
    Moskalik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/38354.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    timber load
    forest road
    loading
    gross vehicle weight
    transportation
    timber haulage
    Opis:
    Forest roads are characterized by low traffic, but heavy timber haulage trucks have a significant influence on road conditions and usually exceed the limit of 80–100 kN per axle. The excessive weight of the trucks degrades the road surface and the forest environment. This article presents the results of a study of timber transport loads from their places of acquirement (forest districts) to the recipient (a large sawmill). The analysis includes the parameters of the timber transport vehicles and focuses especially on the gross vehicle weight (GVW), the total weight of empty truck and trailer during transport, and the weight of their loads. Scania, Iveco, Man, and Mercedes trucks with trailers and semitrailers designed for large-size pine timber transport were analyzed. ANOVA results revealed that all 80 analyzed vehicles exceeded the permitted GVW in the range from 2.28 to 19.94 Mg, transporting from 20.1 to 37.5 m3 of timber. The coefficient of determination between the amount of hauled timber and the GVW equaled 62.7%. Research conducted previously concluded that forest roads with ground and gravel surfaces are not suitable for overloads of 120–150 kN per axle. Therefore, it is necessary to find a logistical solution that will allow the load volume to be maintained at an acceptable level without destroying the forest road surface.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2013, 55, 4
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zróżnicowanie sezonowe składu pokarmu sarny europejskiej na terenie Żytomierskiego Polesia Ukrainy
    The diet of the roe deer (Capreolus capreolus) in the forest ecosystems of Zhytomirske Polesie of the Ukraine
    Autorzy:
    Krasnov, V.
    Shelest, Z.
    Boiko, S.
    Gulik, I.
    Sieniawski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1310939.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    Ukraina
    Polesie Zytomierskie
    fauna
    sarna europejska
    Capreolus capreolus
    sklad pokarmu
    zmiany sezonowe
    foraging ecology
    stomach content analysis
    diet components
    Opis:
    The botanical composition of the European roe deer diet in the radioactively contaminated forest ecosystems of Zhytomirske Polesie of the Ukraine was investigated. Deer were caught monthly over a two–year period on three plots in forest habitats typical for Zhytomirske Polesie (fresh and moist mixed coniferous forests and mixed broadleaved forests). An analysis of the stomach contents of hunted deer showed that they consumed leafy as well as leafless stems, grasses, fruits and mushrooms depending on the season and availability of forest plants. Each season was characterized by one major dietary component. In the spring, the main component of the deer diet was the stems of woody plants. 44 species of vascular plants (3% of the natural flora of the region) were identified in the roe deer diet including 41 species of Magnoliophyta, of which 34 species of Magnoliopsida and 7 species of Liliopsida, 2 species of Polipodiophyta and one species of Pinophyta. Species such as aspen (Populus tremula), oak (Quercus robur), blackberry (Rubus nessensis) and bilberry (Vaccinium myrtillus) were consumed year-round.
    Źródło:
    Leśne Prace Badawcze; 2015, 76, 2; 184-190
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radioaktywne skażenie składu pokarmu sarny europejskiej Capreolus capreolus na terenie Żytomierskiego Polesia Ukrainy
    Radioactive contamination of dietary components of the roe deer in the forests of Zhytomirske Polesie of Ukraine
    Autorzy:
    Krasnov, V.
    Shelest, Z.
    Boiko, S.
    Gulik, I.
    Sieniawski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1311644.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    zwierzeta lowne
    sarny
    sarna europejska
    Capreolus capreolus
    pokarm
    sklad pokarmu
    podrost
    podszyt
    krzewinki
    grzyby
    skazenia radioaktywne
    cez promieniotworczy
    zawartosc cezu
    zmiennosc sezonowa
    Polesie Zytomierskie
    Ukraina
    radioactive contamination
    roe deer diet
    137Сs
    Zhytomirske Polesie of Ukraine
    Opis:
    This paper presents a study on radioactive contamination of dietary components of the roe deer (Capreolus capreolus) in Zhytomirske Polesie (Ukraine). Studies were conducted on two research plots in forests with similar levels of radioactive contamination, 29 ± 8 kBq/m2 - 55 ± 17 kBq/m2, in mixed coniferous forests and mixed broadleaved forests, which are the dominant forest types of the area. The highest level of radionuclide accumulation was observed in young oak seedlings. The dynamics for oak sprouts indicate that the accumulation coefficient reaches a maximum in September and August in the mixed coniferous and mixed broadleaved forests respectively. A comparison of mean values of the 137Cs accumulation coefficients in the shoots of undergrowth plants confirms that an increase in soil fertility leads to a reduction of radionuclides in plant phytomass. In the mixed broadleaved forests, average values of the coefficient of 137Cs accumulation in phytomass of blackberry was 26% and of raspberries 58% lower compared to mixed coniferous forests. The maximum contamination of phytomass was observed in August for oak, in October for aspen, and in July for birch. The highest specific activity of 137Cs in raspberry shoots occurs during the three summer months, whereas the peak in blackberry occurs from August to September. The dynamics of the specific activity of 137Cs in blueberry, cranberry and heather show an increase in radioactive contamination of phytomass towards the end of the growth period. The maximum concentration of 137Cs in shoots of heather and bilberry was recorded in October and for blueberry in August. Mushrooms in mixed coniferous forests can be ranked as follows according to the degree of 137Cs contamination: Cantharellus < Boletus edulis < Russula < Leccinum < Xerocomus badius < Paxillus involutus. In mixed broadleaved forests the ranking is Cantharellus < Boletus edulis < Russula < Xerocomus badius < Leccinum < Paxillus involutus. Within one habitat type, we observed fairly significant variations in 137Cs accumulation in fruit bodies of fungi species.
    Źródło:
    Leśne Prace Badawcze; 2015, 76, 3; 221-228
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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