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Tytuł:
Zastosowanie metody FTA do identyfikacji zagrożeń występujących podczas pracy urządzeń transportu podziemnego
Application of FTA method for hazard identification during work of underground transport devices
Autorzy:
Ignac-Nowicka, J.
Powiązania:
https://bibliotekanauki.pl/articles/113762.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
transport podziemny
zagrożenia górnicze
analiza drzewa błędów
underground transport
mining hazards
fault tree analysis
Opis:
Urządzenia transportu podziemnego ze względu na pracę w ograniczonych przestrzeniach wyrobisk górniczych niosą specyficzne zagrożenia dla pracującej załogi. W artykule przeanalizowano pracę maszyn transportowych takich jak: taśmociągi, kolej szynowa oraz transport pionowy w szybach górniczych. Do analizy zagrożeń wykorzystano metodę drzewa błędów wyznaczając bezpośrednie i pośrednie przyczyny zagrożeń w transporcie podziemnym. Konstrukcję drzewa błędów przedstawiono dla trzech rodzajów zdarzeń: transport taśmociągiem, kolejką szynową oraz transport pionowy szybem kopalnianym.
Underground transport equipment due to work in limited spaces of mining excavations carry specific hazards to the working crew. The article analyzes the operation of transport machines such as conveyor belts, underground railway and vertical transport in mining shafts. The fault tree method was used to analyze the hazards by determining the direct and indirect causes of hazards in underground transport. The construction of the fault tree was presented for three types of events: transport by conveyor, underground railway and vertical transport by a mine shaft.
Źródło:
Systemy Wspomagania w Inżynierii Produkcji; 2018, 7, 1; 209-217
2391-9361
Pojawia się w:
Systemy Wspomagania w Inżynierii Produkcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie alternatywnych metod przetwarzania danych w analizie dendroklimatologicznej modrzewia Larix decidua Mill. z Polski południowej
Alternative methods of data processing in dendroclimatological analysis of larch Larix decidua Mill. from southern Poland
Autorzy:
Danek, M.
Danek, T.
Powiązania:
https://bibliotekanauki.pl/articles/973808.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
analiza dendroklimatyczna
dendroklimatologia
Larix decidua
modrzew europejski
przetwarzanie danych
szeregi czasowe
leśnictwo
drzewa leśne
słoje przyrostu rocznego
tree ring analysis
latewood
earlywood
dendroclimatology
larix decidua mill.
data processing
Opis:
The aim of this study was to assess the impact of climatic factors (temperature and precipitation) on tree ring width of larches from stands localised in southern part of Poland. Total ring as well as early− and latewood widths were taken in consideration. At the beginning authors used only standard processing and methods. Classic approach were insufficient to make some data useful for the correlation analysis, so authors decided to use more robust, custom methods.
Źródło:
Sylwan; 2011, 155, 03; 147-158
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ trzebieży na przyrost radialny dębu w Nadleśnictwie Międzyrzec
Effect of thinning on radial increment of oak in Miedzyrzec Forest District
Autorzy:
Sacewicz, W.
Bijak, S.
Powiązania:
https://bibliotekanauki.pl/articles/985716.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewa lesne
dab
Quercus
reakcje przyrostowe
przyrosty radialne
zabiegi hodowlane
trzebieze
Nadlesnictwo Miedzyrzec
quercus sp.
tree−ring analysis
silvicultural treatment
increment response
Opis:
The intermediate cuttings have an important impact on the stand structure and productivity. Choosing the right method of the treatment performance is the decision, which is fundamental in shaping tree stands stability. The radial increment, apart from the natural growth potential of particular species, is influenced by many abiotic, biotic and anthropogenic factors, among which one can distinguish those that influence it directly, e.g. thinning. The study objective was to determine the effect of silvicultural treatments on the increment reaction of oak (Quercus sp.) stands in the Międzyrzec Forest District (eastern Poland). The empirical material was collected in six forest stands located in the Witoroż forest range. In each stand we cored 10 dominant and co−dominant trees (representing 1st and 2nd Kraft’s biosocial classes). After the measurements of the tree−ring widths and the synchronization of incremental series, the raw and standard chronologies were elaborated for each stand. In total, we analysed 8 treatments: six early and one late selection thinnings, and one late salvage thinning (tab. 1). For each treatment, three− and five−years’ value of mean tree−ring width was calculated for the period before and after the cut. Additionally, we calculated the incremental response parameters: recovery (Rc), resilience (Rs) and resistance (Rt) indices. For the majority of the analysed treatments, the cuts resulted in an increase in average tree−ring width both in the 3−, and 5−years perspective. However, statistically significant changes in this parameter occurred only in a few cases (fig. 2). The average values of incremental response indicators show that the investigated oak stands are characterized by a significant adaptive capacity and a rapid recovery of incremental capacity in the analysed time spans. At the same time, the low values of Rt index suggest that their growth resistance to disturbance caused by the thinning is rather low. The age of the stand at the time of the treatment significantly affected the incremental response parameters of the examined oaks. The older the stand, the incremental response was less intense.
Źródło:
Sylwan; 2019, 163, 08; 645-654
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ działalności przemysłowej na szerokość przyrostów rocznych sosen (Pinus sylvestris L.) w rejonie Olkusza
The influence of industry on the tree-ring width of pines [Pinus sylvestris L.] living in the Olkusz region
Autorzy:
Danek, M.
Powiązania:
https://bibliotekanauki.pl/articles/1013368.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
szerokosc
rejon Olkusza
zanieczyszczenia przemyslowe
tereny przemyslowe
sloje przyrostu rocznego
czynniki antropogeniczne
sosna zwyczajna
lesnictwo
zanieczyszczenia powietrza
Pinus sylvestris
drzewa lesne
tree−ring analysis
abrupt growth changes
influence of industry
pinus sylvestris
olkusz region
Opis:
Tree−ring analysis of pine stands living under the influence of industry in south−eastern part of Silesia−Krakow Upland was performed for the last years. Now the new transect was added in the Olkusz region. Previous studies showed the distinct relationship between number of trees with observed reductions and distance from main source of pollution it this region. On the sites localised nearest to zinc−works "Bolesław" the value and the duration of reduction periods were the biggest. On the sites of new transect (OL VI) situated to the north from site OL 15, the influence of zinc−works is rather uncertain. Because of the time of occurrence and the distance form zinc−work, the reductions observed here seem to be the reaction to the other factor – perhaps the local source of pollution. To explain this matter further studies in this region should be done.
Źródło:
Sylwan; 2008, 152, 11; 56-62
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ działalności przemysłowej na drzewostany sosnowe w rejonie Tarnobrzega w świetle analizy dendrochronologicznej
The influence of industry on Scots pine stands in the Tarnobrzeg area on the basis of dendrochronological analysis
Autorzy:
Barniak, J.
Krąpiec, M.
Powiązania:
https://bibliotekanauki.pl/articles/1009636.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
Tarnobrzeski Okreg Przemyslowy
lesnictwo
drzewostany sosnowe
dendrochronologia
zanieczyszczenia przemyslowe
oddzialywanie na srodowisko
tereny przemyslowe
sosna zwyczajna
przyrosty roczne
Pinus sylvestris
tree−ring analysis
industrial pollution
pinus sylvestris
tarnobrzeg region
se poland
Opis:
Tree−ring analysis has been used to evaluate the influence of industrial pollution on Scots pine (Pinus sylvestris) growing in the Tarnobrzeg region. 237 samples were taken from stands located in two profiles to picture dependence of health conditions of trees on distance from the emitter. The Tarnobrzeg Sulphur Works was the main source of pollution in that region. Factories in Mielec and Nowa Dęba as well as the Połaniec Power Plant could be additional sources of emission. Response of trees to anthropogenic stress was clearly visible in the years 1970−1990, when growth reductions occurred at the majority of the investigated trees. At the beginning of 1990s the decreasing trend stopped and wider tree−rings could be observed.
Źródło:
Sylwan; 2009, 153, 12; 825-835
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Visualisation of nominal data – practical and theoretical remarks
Wizualizacja danych mierzonych na skali nominalnej – uwagi praktyczne i teoretyczne
Autorzy:
Mącik, Radosław
Powiązania:
https://bibliotekanauki.pl/articles/424833.pdf
Data publikacji:
2016
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
Text data
nominal data
visualisation
word cloud
word tree
chord graph
correspondence analysis
Opis:
Nominal data, due to their nature, are often analysed statistically in a quite limited and traditional way. Usually they come from open-ended or simple/multiple choice questions. In typical research projects, such data are often presented in the form of more or less complex tables (including contingency tables) and standard charts. The author’s experience shows that such a visualisation is perceived as boring, especially by younger people, accustomed to the presentation of content in the form of infographics. The article presents examples of data analysis and a visualisation of the nominal data based on the results of the author’s research, including theoretical reflections on the techniques and tools used. The starting point is the raw text data from the responses to the open-ended questions subjected to analyses of the frequency of words and expressions, including its visualisation through word clouds. The next step is categorization and tabulation at the level of individual variables including the visualisation of categories, to assess the contingency between two nominal variables (or the nominal and the ordinal one), including visualising the relationships via chord diagrams and the correspondence analysis.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2016, 2 (52); 22-34
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utility of two mitochondrial markers for identification of Picea abies refugial origin
Autorzy:
Litkowiec, M
Dering, M.
Lewandowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/41333.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
coniferous plant
tree
Norway spruce
Picea abies
mtDNA
molecular marker
mitochondrial marker
identification
polymerase chain reaction
RFLP analysis
gene pool conservation
forest ecosystem
plant population
Opis:
Picea abies (L.) Karst is one of the most important coniferous species of Europe from both ecological and economical points of view. Traditional methods for the gene pool conservation and biodiversity maintenance in forest ecosystems have been practiced in many countries. For progress in this field using highly polymorphic genetic molecular markers is needed. Our goal was to demonstrate the utility of two polymorphic mitochondrial markers mt15-D02 and nad1 b/c in identification native Norway spruce stands. This molecular markers were tested in 1401 individuals from 59 Polish Norway spruce populations. We detected three alleles, which are called1, 2 and3, for locus mt15-D02 and two alleles , which are called1 and2, for locus nad1 b/c in our material. All five variants of alleles indicate the natural origin of P. abies. Result of this study shows that molecular marker mt15-D02 is easy to use and more informative in compare to marker nad1 b/c.
Źródło:
Dendrobiology; 2009, 61; 65-71
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using Reliability Block Diagrams and Fault Tree circuits, to develop a Condition Based Maintenance Model for a Vessel’s Main Propulsion System and Related Subsystems
Autorzy:
Anantharaman, M.
Powiązania:
https://bibliotekanauki.pl/articles/117168.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Fault Tree
Main Engine
Propulsion System
Condition Based Maintenance (CBM)
Planned Maintenance System
Reliability Block Diagrams
Main Propulsion
fault tree analysis (FTA)
Opis:
Merchant shipping has undergone a great transformation over the past three decades. The shipping market is highly competitive, which coupled with high crewing and fuel costs, leads to high operational costs. One of the paramount factor involved in vessel operation is the Maintenance cost and there is a dire need to keep this cost to a minimum. Fortunately the earlier policy of repair only maintenance in commercial shipping has been done away with, and was replaced by the policy of preventive maintenance. Planned Maintenance System was introduced by ship management companies in the early 90’s. Planned Maintenance offered benefits over the repair only policy, but has its own demerits. Many a time machinery equipment is opened up for routine maintenance after a specified time interval, irrespective of the need. This could lead to potential failures, which is explained by the fact that preventive maintenance resulted in meddling of a well set piece of machinery equipment, leading to its subsequent failure. This is where Condition based maintenance or CBM steps into prominence. CBM monitors the health of the machinery equipment, analyses the condition and helps you in decision making. The Main Propulsion system forms the heart of a vessel and we need to ensure its reliability, together with the reliability of its associated sub-systems. The entire system can be represented by reliability block diagrams, to show the interdependence of various components comprising the system. This helps in the decision making process of CBM whereby ship’s engineer may decide to stop the running machinery equipment, open and overhaul the same, else postpone the overhaul for a later safe date.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 3; 409-413
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tunnel parsing with counted repetitions
Autorzy:
Handzhiyski, Nikolay
Somova, Elena
Powiązania:
https://bibliotekanauki.pl/articles/1839240.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
parsing
syntax analysis
parser generator
concrete syntax tree
Opis:
This article describes a new and efficient algorithm for parsing (called tunnel parsing) that parses from left to right on the basis of context-free grammar without left recursion nor rules that recognize empty words. The algorithm is mostly applicable for domain-specific languages. In the article, particular attention is paid to the parsing of grammar element repetitions. As a result of the parsing, a statically typed concrete syntax tree is built from top to bottom, that accurately reflects the grammar. The parsing is not done through a recursion, but through an iteration. The tunnel parsing algorithm uses the grammars directly without a prior refactoring and is with a linear time complexity for deterministic context-free grammars.
Źródło:
Computer Science; 2020, 21 (4); 441-462
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tree stumps from the bottom of the Vistula Lagoon as indicators of water level changes in the Southern Baltic during the Late Holocene
Autorzy:
Leczynski, L.
Miotk-Szpiganowicz, G.
Zachowicz, J.
Uscinowicz, S.
Krapiec, M.
Powiązania:
https://bibliotekanauki.pl/articles/47624.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
tree stump
bottom
palynological analysis
Vistula Lagoon
Baltic Sea
Gdansk Gulf
water level change
Late Holocene
Opis:
The Vistula Lagoon is situated along the south-eastern shore of the Gulf of Gdańsk and is linked with the gulf through the Strait of Baltiysk. Separated from the open sea by the Vistula Spit, the Vistula Lagoon is a shallow body of water with a mean depth of 3 m; the bottom is covered with a layer of mud several metres thick. This article presents a unique, newly discovered locality of tree stumps occurring in situ at the bottom of the Vistula Lagoon. The radiocarbon age of the alder stumps and the top of the peat in which they are rooted is Subboreal. The alder wood was dated to 4770±35 and 3295±35 years BP. The top layers of peat were dated to 4670±40, 4410±35 and 3690±35 years BP. The considerable scatter of the dates indicates the significance of erosional processes during marine transgressions. Radiocarbon dates and pollen analyses indicate that in the late Atlantic – early Subboreal periods, the water level of the Vistula Lagoon was about 3 m lower than it is today. The −2 m level was passed no earlier than c. 3500 years ago; the −1 m level was reached around 2000 years ago.
Źródło:
Oceanologia; 2007, 49, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three-dimensional numerical analysis of internal flow phenomena in a diagonal rotor
Autorzy:
Bin, Y.
Keqi, W.
Powiązania:
https://bibliotekanauki.pl/articles/1955712.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska
Tematy:
diagonal rotor
numerical analysis
internal flow
tree-dimensional analysis
Opis:
A numerical analysis has been designed to study internal flow phenomena in a diagonal rotor. A calculated diagonal rotor was designed by a quasi-three-dimensional method. Its hub and casing walls were inclined 45o and 25o, respectively. The numerical simulation was based on the Navier-Stokes equations coupled with a k-ε turbulence model. We found that the rotor's wake was stronger near the hub and in the casing end wall region. The wake at a lower flow rate was stronger than that at a higher flow rate. Static pressure gradually increased from the hub to the casing along the height of a blade, on the rotor pressure surface and in the front 60% of the chord region of the suction surface. In the back 40% of the chord region of the suction surface, static pressure gradually decreased. A passage vortex formed in the stator flow passage and an 80% axial chord plane. It was located near the hub end-wall. The passage vortex developed into a large vortex centered near the midspan at a 99% axial chord plane of the stator. The casing wall boundary layer downstream of the rotor occupied approximately 10% of the flow passage. Along the height of a blade, the meridian velocity gradually increased upstream of rotor and decreased downstream. The calculated aerodynamic characteristic curve, the meridian velocity distribution upstream and downstream of the rotor, and the streamline distribution on the meridian surface were consistent with experimental results and design data. Our findings proved that the present numerical method is reliable and practicable. It can be used to design and analyze swept diagonal rotors in order to improve their surging and rotation stall state. The present results also provide comparative data for the design of highly-loaded swept diagonal rotors in future studies.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 1; 27-40
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analysis of transformers condition based on Bayes-discriminant method with fault-tree fuzzy evaluation
Autorzy:
Li, Dianyang
Wang, Shanyuan
Zhang, Yujie
Feng, Jian
Wang, Hongzhe
Qin, Ling
Powiązania:
https://bibliotekanauki.pl/articles/328004.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
oil-immersed power transformers
fault tree analysis
fuzzy-evaluation system
Bayes-discriminant
health-operation
transformator mocy
system monitorowania
analiza drzewa błędów
Opis:
China's electric power construction is renewing Increasingly, and the network is complex and changeable where the automation is getting higher. In this paper, Fuzzy evaluation system is established according to fault tree, and the estimation of transformer’s state is judged by analytic hierarchy process. Bayes-discriminant and discriminant formula are used to discriminate transformer’s attributes, which are based on historical data. The machine identification of transformer faults combines the fuzzy evaluation and Bayes-discriminant. It’s accuracy can be improved by correcting parameters. This method can effectively avoid subjective interference caused by artificial weights. The example shows that this method could be applied to judge health status of electric power equipment and this method can play an early-warning role in the operation of monitoring system.
Źródło:
Diagnostyka; 2020, 21, 2; 3-12
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
System reliability optimisation of Cooling-cum-Condensate-Extraction system
Optymalizacja niezawodności układu chłodzenia z systemem odprowadzania skroplin
Autorzy:
Biswal, G. R.
Powiązania:
https://bibliotekanauki.pl/articles/302113.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
cooling-cum-condensate-extraction system
fault tree analysis
system reliability
system safety
machine health monitoring
układ chłodzenia z odprowadzeniem skroplin
analiza drzewa błędów
niezawodność systemu
bezpieczeństwo systemu
monitorowanie stanu maszyn
Opis:
A novel methodology is presented for condensation in power generation plants; this section is the main intersection of heat loss, typically 40% thermal efficiency of a plant. Condensate section is interfaced with the generating section to enhance the active contribution of the system. Both the cooling section and the condensate section are integrated and interfaced through the low-pressure and high-pressure cycles to attain the improved electrical efficiency, which affects the heat transfer capability of the power generation plants. This paper proposess a Cooling-cum-Condensate-Extraction System (CCES), to dedicate a 36-MW- captive power plant. The paper is dedicated for the design and development of an effective CCES, analyzing its impact over the systems in terms of system reliability optimization, and the role of real-time optimization. The designed model also contributes in discharging lesser amount of flu gases as against existing technologies with its improved active operation hours.
W artykule przedstawiono nowatorską metodologię procesu skraplania do zastosowania w części kondensacyjnej elektrowni, gdzie dochodzi do największych strat ciepła – przeważnie aż 40% wydajności termicznej elektrowni. W proponowanym rozwiązaniu instalację kondensacyjną sprzężono z częścią prądotwórczą aby zwiększyć aktywny wkład systemu. Część chłodzącą zintegrowano i sprzężono z częścią kondensacyjną poprzez cykle nisko- i wysokociśnieniowe, uzyskując w ten sposób lepszą wydajność elektryczną, co ma wpływ na zdolność wymiany ciepła w elektrowni. W artykule przedstawiono układ chłodzenia z systemem odprowadzania skroplin (CCES) przeznaczony dla elektrowni potrzeb własnych o mocy 36 MW. Pracę poświęcono projektowaniu i konstrukcji efektywnego CCES, analizując jego wpływ na systemy elektrowni w zakresie optymalizacji niezawodności systemów oraz roli optymalizacji w czasie rzeczywistym. Zaprojektowany przez nas model, w porównaniu z istniejącymi technologiami, przyczynia się również do zmniejszenia emisji gazów odlotowych dzięki zoptymalizowanemu czasowi pracy.
Źródło:
Eksploatacja i Niezawodność; 2016, 18, 1; 117-122
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sycamore maple (Acer pseudoplatanus L.) stands on former agricultural land in the Sudetes – evaluation of ecological value and production potential
Autorzy:
Vacek, Stanislav
Vacek, Zdeněk
Kalousková, Ivana
Cukor, Jan
Bílek, Lukáš
Moser, W. Keith
Bulušek, Daniel
Podrázský, Vilém
Řeháček, David
Powiązania:
https://bibliotekanauki.pl/articles/956977.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
stand structure
growth dynamics
production
climate
tree-ring analysis
game damage
central europe
Opis:
Sycamore maple (Acer pseudoplatanus L.) is a fast-growing tree species that produces economically attractive timber, provides ecological services and has high site adaptability, but it is only a minor component of European forests. This paper describes production, structure and diversity of sycamore-dominated forest stands that originated by succession on former agricultural lands in the Orlické hory Mts., the Czech Republic. The partial objectives were to determine impact of climatic factors on the radial growth of sycamore maple and evaluate the effect of game on natural regeneration. The number of sycamore seeds on the ground was on average 9–34 seeds m–2 and seedling mortality reached on average 89% caused by damage of hare and drought. Density of natural regeneration ranged from 1,532 to 4,244 recruits ha–1, but growth dynamic was strongly influenced by ungulate browsing (69%) with the largest losses in sycamore (96%). Analyses of climatic effects showed a significantly close relationship with growth of sycamore in submontane areas, being especially sensitive to extremely dry and cold winters or very high summer temperatures. Radial growth was more significantly influenced by monthly temperatures compared to precipitation, but increasing sum of annual precipitation was main positive driver factor of diameter increment. Radial growth had the strongest relationship with weather conditions in July and October of previous year and March of the current year. Stand volume ranged from 378 to 545 m3 ha–1 at age around 75 years, while sycamore accounted for 32–82%. The horizontal structure of the tree layer was mostly random to aggregated; resembling the clumped spatial pattern of natural regeneration. Besides their wood production, these stands fulfil many ecosystem functions that are associated with high ecological stability, high structural differentiation and medium to high species diversity.
Źródło:
Dendrobiology; 2018, 79; 61-76
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Standardy dendrochronologiczne sosny zwyczajnej (Pinus sylvestris L.) i dębu szypułkowego (Quercus robur L.) z północno-wschodniej Polski
Dendrochronological standards of Scots pine (Pinus sylvestris L.) and English oak (Quercus robur L.) from north-eastern Poland
Autorzy:
Krąpiec, M.
Szychowska-Krąpiec, E.
Powiązania:
https://bibliotekanauki.pl/articles/1024214.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
Polska Polnocno-Wschodnia
dendrochronologia
Quercus robur
sosna zwyczajna
lesnictwo
dab szypulkowy
standardy dendrochronologiczne
Pinus sylvestris
drzewa lesne
pine
oak
tree−ring analysis
local and regional chronologies
ne poland
Opis:
The study presents results of dendrochronological analyses of Scots pine (162 trees) and English oak (97 trees) from 13 research plots located in NE Poland. The investigations resulted in construction of local chronologies (six for oak and seven for pine), which in turn enabled to define new regional chronologies; 2_NE_PL for pine, covering the period 1738−2003 AD, and Q_NE_PL for oak, 308−year long (1696−2003 AD). The elaborated chronologies allow for absolute dating of wood and yield new data on the extent of dendrochronological signal.
Źródło:
Sylwan; 2004, 148, 07; 11-19
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 73

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