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Wyświetlanie 1-15 z 559
Tytuł:
Analiza wybranych czynnikow srodowiska w odniesieniu do problemu zamierania odnowien jodly pospolitej [Abies alba Mill.]
Autorzy:
Ambrozy, S.
Powiązania:
https://bibliotekanauki.pl/articles/53267.pdf
Data publikacji:
2003
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
jodla pospolita
czynniki srodowiska
odnowienia lasu
hodowla lasu
Abies alba
lesnictwo
odnowienia naturalne
zamieranie drzew
Źródło:
Prace Instytutu Badawczego Leśnictwa. Seria A; 2003, 3[956-959]; 37-59
0369-9870
Pojawia się w:
Prace Instytutu Badawczego Leśnictwa. Seria A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sposoby wykorzystania odnowień brzozy brodawkowatej Betula pendula Roth do przebudowy na obszarach po rozpadzie drzewostanów świerka pospolitego Picea abies (L.) H. Karst. w Beskidzie Śląskim
Ways to use silver birch Betula pendula Roth regeneration in sites considered for stand conversion due to decline of Norway spruce Picea abies (L.) H. Karst. in the Silesian Beskid Mountains
Autorzy:
Ambrozy, S.
Zachara, T.
Kapsa, M.
Chomicz-Zegar, E.
Vytscha, R.
Powiązania:
https://bibliotekanauki.pl/articles/46018.pdf
Data publikacji:
2017
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
drzewostany swierkowe
swierk pospolity
Picea abies
drzewostany pokleskowe
odnowienia lasu
odnowienia naturalne
brzoza brodawkowata
Betula pendula
wykorzystanie
przebudowa drzewostanow
Opis:
One of the tree species appearing after a decline of Norway spruce Picea abies (L.) H. Karst. in the Silesian Beskid Mountains is Silver Birch Betula pendula Roth. Therefore our study was aimed at evaluating this birch regeneration and the dynamics of changes resulting from experimental cutting. Measurements and inventories of trees were conducted on research plots located in a ten-year old birch regeneration site with either no cutting, partial cutting (50%) or clear cutting (100%) of birch. We observed an introduction of biocenotic species (rowan, willow, aspen) as well as the target species (spruce, fir, beech) under the birch canopy. Fir and beech were also planted, because of their slow natural regeneration. The clear cut treatment caused a great number of sprouts growing from birch stumps, reaching a height of about 2 m over 3 years, resulting in competition with the regeneration of other species. Partial cutting did not cause such a drastic amount of sprouting. Furthermore, we found that only the spruce height increment is significantly less under a birch canopy compared to open space. The obtained results indicate a necessity to adjust the density and species composition of regenerating tree species under a birch canopy, avoiding complete removal of the first generation birch cover and the need to moderately thin out birch.
Źródło:
Leśne Prace Badawcze; 2017, 78, 3
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lasotworcza rola swierka pospolitego [Picea abies L.Karst.] Puszczy Knyszynskiej i Puszczy Bialowieskiej
Autorzy:
Andrzejczyk, T.
Szeligowski, H.
Powiązania:
https://bibliotekanauki.pl/articles/824314.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
wystepowanie
gatunki lasotworcze
Picea abies
lesnictwo
Puszcza Bialowieska
Puszcza Knyszynska
swierk pospolity
drzewa lesne
Źródło:
Sylwan; 2000, 144, 02; 5-18
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ warunków siedliskowych na strukturę i zasobność drzewostanów świerkowo-sosnowych w Puszczy Augustowskiej
Impact of site conditions on the structure and volume of spruce-pine stands in the Augustowska Primeval Forest
Autorzy:
Andrzejczyk, T.
Drozdowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/1016334.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
warunki siedliskowe
hodowla lasu
lesnictwo
struktura drzewostanu
drzewostany swierkowo-sosnowe
zasobnosc drzewostanu
Puszcza Augustowska
norway spruce
picea abies
spruce−pine stands
sub−boreal stands
age structure
multi−storeyed structure
site
Opis:
The role of spruce in shaping the structure and volume of pine stands in the Augustowska Primeval Forest (north−eastern Poland) increases with the increase of site fertility. On poor coniferous forest sites, spruce occurs mainly in an understorey and sporadically as an admixture species, whereas on medium−fertile and fertile sites it builds the second storey and occurs in the upper storey accounting for about 30−40% of stand volume. In mature pine stands of the Augustowska Primeval Forest, spruce comes from natural regeneration. Taking into consideration the course of the regeneration process, four types of spruce age structure are distinguished.
Źródło:
Sylwan; 2007, 151, 01; 30-40
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wplyw warunkow suszenia nasion brzozy brodawkowatej, olszy czarnej, sosny zwyczajnej i swierka pospolitego na ich zywotnosc
Autorzy:
Anisko, E.
Witowska, O.
Zaleski, A.
Powiązania:
https://bibliotekanauki.pl/articles/45384.pdf
Data publikacji:
2006
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
brzoza brodawkowata
suszenie
nasiennictwo
lesnictwo
Picea abies
olsza czarna
Pinus sylvestris
Betula pendula
nasiona
sosna zwyczajna
zywotnosc nasion
Alnus glutinosa
drzewa lesne
swierk pospolity
Źródło:
Leśne Prace Badawcze; 2006, 2; 91-113
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porównanie ciepła spalania i wartości opałowej szyszek wybranych gatunków drzew leśnych
Comparison of heat of combustion and calorific value of the cones and wood of selected forest tree species
Autorzy:
Aniszewska, M.
Gendek, A.
Powiązania:
https://bibliotekanauki.pl/articles/1312894.pdf
Data publikacji:
2014
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
biomasa
szyszki
cieplo spalania
wartosc opalowa
drzewa lesne
sosna zwyczajna
Pinus sylvestris
swierk pospolity
Picea abies
modrzew europejski
Larix decidua
jodla pospolita
Abies alba
cone
wood
biomass
heat of combustion
calorific value
Opis:
Every year, scaling plants buy (up to tens of tons) cones which needs to be peeled. After the process of scaling, the cones themselves are waste, which is partly sold. The problem of waste disposal is especially severe in plants where the processing is performed by electrically-powered scaling cabinets, but the problem does not apply to facilities where pellets are burned to produce heat. We examined the heat of combustion and calorific value of the residues from scaling plants that can be used in the production of refined wood fuels. The residues consist of the empty cones of pine, spruce, larch as well as husks and stems of silver fir. Additionally, we conducted measurements of the heat of combustion for wood and cones of each species and compared them to their respective calorific values The results revealed that the average calorific value of the cones is in the range 17.81–19.86 MJ/kg. Our work showed that empty cones have a significantly higher calorific value and heat of combustion than the wood of spruce, larch and fir. In the case of pine, cones and wood did not differ significantly. These results led us to the conclusions that empty de-scaled cones can be utilized as a valuable primary solid fuel or fuel additive for the production of refined products for the local market. Due to the low annual production of cones in comparison to other materials such as sawdust and wood chips, pine cones should be used as a supplement, to enrich fuels of inferior quality by enhancing their energetic properties.
Źródło:
Leśne Prace Badawcze; 2014, 75, 3; 231-236
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane cechy szyszek jodły pospolitej Abies alba Mill. w aspekcie procesu wyłuszczania i jakości nasion
Selected traits of Silver fir Abies alba Mill. cones in the context of the extraction process and seed quality
Autorzy:
Aniszewska, M.
Brzozko, J.
Zychowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/45428.pdf
Data publikacji:
2018
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
drzewa lesne
jodla pospolita
Abies alba
szyszki
trzpien szyszki
wielkosc szyszek
zawartosc wody
wyluszczanie nasion
jakosc nasion
Źródło:
Leśne Prace Badawcze; 2018, 79, 2
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmienność szyszek jodły pospolitej (Abies alba Mill.) - zmienność parametrów zewnętrznych szyszek
Variability of silver fir (Abies alba Mill.) cones - variability of cone parameters
Autorzy:
Aniszewska, M.
Bluszkowska, U.
Powiązania:
https://bibliotekanauki.pl/articles/1294728.pdf
Data publikacji:
2016
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
drzewa lesne
jodla pospolita
Abies alba
szyszki
ksztalt
parametry zewnetrzne
modele geometryczne
cone
scales
area
volume
shape
Opis:
This study aimed at determining the shape of closed silver fir cones from the Jawor Forest District (Wroclaw), based purely on measurements of their length and thickness. Using these two parameters, the most accurate estimations were achieved with a fourth-degree polynomial fitting function. We then calculated the cones’ surface area and volume in three different ways: 1) Using the fourth-degree polynomial shape estimation, 2) Introducing indicators of compliance (k1, k2, k3) to calculate the volumeand then comparing it to its actual value as measured in a pitcher filled with water, 3) Comparing the surface area of the cones as calculated with the polynomial function to the value obtained from ratios of indicators of compliance (ratios k4 and k5).We found that the calculated surface area and volume were substantially higher than the corresponding measured values. Test values of cone volume and surface area as calculated by our model were 8% and 5% lower, respectively, compared to direct measurements. We also determined the fir cones apparent density to be 0.8 g·cm-3on average. The gathered data on cone surface area, volume and bulk density is a valuable tool for optimizing the thermal peeling process in mill cabinets to acquire high quality seeds.
Źródło:
Leśne Prace Badawcze; 2016, 77, 3
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmienność szyszek jodły pospolitej (Abies alba Mill.) – zróżnicowanie budowy powierzchni łusek nasiennych
Variability of silver fir (Abies alba Mill.) cones – variability of scale surface area
Autorzy:
Aniszewska, M.
Gendek, A.
Śliwińska, J.
Powiązania:
https://bibliotekanauki.pl/articles/1293578.pdf
Data publikacji:
2017
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
drzewa lesne
jodla pospolita
Abies alba
szyszki
luski nasienne
zmiennosc
pole powierzchni
powierzchnia parowania
mikroskop elektronowy skaningowy
cone
scale
area of evaporation
scanning electron microscope
Opis:
This study was conducted on a batch of closed silver fir cones from Jawor Forest District and a mixture of scales from the seed extraction facility Grotniki. The scales were divided into three size classes corresponding to the bottom, middle and upper part of the cones and their area was measured with the Multi Scan Base v.18.03 software. Based on the sum of the inner and outer surface area of all scales, we then determined the total area of evaporation from the cones. In addition, the area of protruding scales was measured for differently sized scales from different parts of the cones. Previous studies have shown that the average outer surface of a closed cone, calculated as the sum of protruding scales, accounts for 10% of the outer surface of an open cone. Pictures of both scale surfaces with the internal seed bed and the external protrusions were taken using a scanning electron microscope. We noticed significant differences in dimension and shape of the channels and trichomes on the scale surface. On the inner side of the scales, we found a high diversity of trichomes of different lengths, whilst the outer side contained channels. Presumably, these characteristics affect the rate of water loss from the cones during desiccation and separation of the seed. In-depth knowledge on the evaporative surfaces of fir cones and scale structure will be helpful for optimizing the industrial processes of seed extraction.
Źródło:
Leśne Prace Badawcze; 2017, 78, 1
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modulus of elasticity tension/bending ratio of polish grown pine (Pinus sylvestris L.) and spruce (Picea abies Karst.) timber
Moduł sprężystości przy rozciąganiu i zginaniu polskiej tarcicy sosnowej i świerkowej
Autorzy:
Bacher, M.
Krzosek, S.
Powiązania:
https://bibliotekanauki.pl/articles/9433.pdf
Data publikacji:
2013
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2013, 82
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Epicuticular wax on stomata of damaged silver fir trees [Abies alba Mill.]
Autorzy:
Bacic, T
Krstin, L.
Rosa, J.
Popovic, Z.
Powiązania:
https://bibliotekanauki.pl/articles/56785.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
abaxial leaf epidermis
silver fir tree
fir decline
epicuticular wax change
Abies alba
air pollution
Pinaceae
stoma
Opis:
Condition of epistomatal wax on the abaxial surface of the current and previous-year needles of damaged silver fir trees (Abies alba Mill.), both from the polluted Risnjak and "clean" Donja Dobra sites in Gorski Kotar region, both influenced by pollutants coming from Europe, during two years, three times a year, were examined with Scanning Electron Microscope. In the course of time the wax tubules on the epistomatal rims of stomata in polluted, but also in "clean" needles surface, become fused and agglomerated rapidly to various extents of morphologically different types of amorphous wax crusts, primarily compact and particulate ones. This process begins very early, especially in polluted Risnjak site, and may be interpreted as a possible result of air pollution. However, the recrystalization, or production of new tubules, also appears relatively quickly in mostly cases. Quantitative estimations indicate a very large total amount of amorphous wax crusts in the current-year needles, and a very high percentage of the same wax in previous-year needles. Amorphous wax crusts cover stomatal pores, as well as the rims, disturbing the normal gas exchange. Statistically there is a signicant tendency of increase in wax degradation in the needles of the polluted site in comparison with those of the unpolluted one, but there is an insignificant wax degradation among the needles of damaged trees within each site. These results confirmed most of the research done in our preliminary report.
Źródło:
Acta Societatis Botanicorum Poloniae; 2005, 74, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The radial growth-competition relationship in Picea abies stands affected by windfall
Autorzy:
Badea, O.
Dumitru, I.
Cojocia, C.
Popa, I.
Powiązania:
https://bibliotekanauki.pl/articles/41406.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Norway spruce
stand
Picea abies
windfall
risk factor
Opis:
Actual status of mountain forests especialy, of Norway spruce (Picea abies Karst. (L)) stands is a result of combined action between forest management measures and biotic and abiotic risk factors. In this context, tree growth dynamics is a result of multifactor interaction (competition, disturbance, management practice, climate etc.). Wind damage affect the stand structure and normal ecosystem functions including the relationship between individual tree growth and competition processes. Though, it is recorded a diminishing of productive capacity for affected stands as well as a significant diameter increment for remaining standing trees. The correlation between tree growth (cumulate basal area increment in the last 10 years) and competition (Hegyi and Schutz competition indices) was analysed in stands with different windfall intensity. No relationship between tree growth and competition was observed in highly affected stands. Schutz competition index explains better individual tree growth comparing with Hegyi index in low or no-affected stand by windthrow. The variability of the basal area increment (lnΔɡ10), explained by competition indices, is rather low (<2%) in the stand that had been highly affected by windfall, regardless of the selected competition index. Thus, significant reduction of the stand density related to number of trees (low density), as a consequence of high intensity windfalls, crown competition has a very small influence on the basal area increment comparing with situations met in low (high density) and moderate (medium density) affected stands.
Źródło:
Dendrobiology; 2015, 73
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Szkodniki nasion i szyszek jodly pospolitej Abies alba Mill. w Swietokrzyskim Parku Narodowym
Autorzy:
Bak, J.
Powiązania:
https://bibliotekanauki.pl/articles/816415.pdf
Data publikacji:
1995
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
jodla pospolita
owady
szkodniki nasion
Abies alba
szkodniki szyszek
Swietokrzyski Park Narodowy
ochrona lasu
lesnictwo
drzewa lesne
Źródło:
Sylwan; 1995, 139, 08; 87-97
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 559

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