Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "tree trunk" wg kryterium: Temat


Wyświetlanie 1-6 z 6
Tytuł:
A study on mango (Mangifera indica L.) trunk decay by Phellinus gilvus (Schw.) Pat. from Himachal Pradesh, India
Autorzy:
Gautam, A.K.
Powiązania:
https://bibliotekanauki.pl/articles/11654.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
mango
Mangifera indica
fruit plant
tree trunk
rot decay
Phellinus gilvus
fungi
pathogenic fungi
India
Opis:
A severe white rot decay of a very old mango (Mangifera indica L.) tree trunk was observed form Himachal Pradesh, a hilly state of north India. The initial of decaying symptoms were firstly noticed in 2010 which progressed with destructive tissue death of tree trunk. A spongy, sessile, bracket-fungus was found associated with the decay. Morphological and microscopic examination of the collected specimens confirmed the fungus as Phellinus gilvus (Schw.) Pat. Since, P. gilvus is a saprobic fungus having a wide host range worldwide and M. indica is one of the most attacked hosts in India. Therefore, the present report is an important addition to the existing knowledge which will be helpful in understanding the pathogen diversity and interaction with host.
Źródło:
International Letters of Natural Sciences; 2014, 06
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie technologii naziemnego skaningu laserowego w określaniu wybranych cech drzew i drzewostanów
The application of terrestrial laser scanning for determining the selected trees and forest stand parameters
Autorzy:
Wężyk, P.
Sroga, R.
Szwed, P.
Szostak, M.
Tompalski, P.
Kozioł, K.
Powiązania:
https://bibliotekanauki.pl/articles/130874.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Geodetów Polskich
Tematy:
naziemny skaning laserowy
TLS
pierśnica (d)
pierśnicowe pole przekroju drzewa (g)
miąższość pnia (V)
terrestrial laser scanning
DBH
basal area
volume of tree trunk
Opis:
Rozwój technologii pozyskiwania geodanych nabrał w ostatnich latach dużego tempa co skutkuje rewolucyjnymi zmianami w wielu dziedzinach gospodarki, w tym w leśnictwie, gdzie obserwuje się wdrażanie takich rozwiązań jak naziemny skaning laserowy (Terrestrial Laser Scanning; TLS). Pomiary wybranych cech drzew takich jak: wysokość, średnica, zbieżystość i objętości (miąższość grubizny) pnia są przedmiotem badań i wdrożeń. Generowane zbiory danych (chmur punktów) TLS wymagają automatycznego procesu ich przetwarzania. Prezentowana praca dotyczy zastosowania metody TLS w inwentaryzacji lasu, tj. określaniu wybranych parametrów takich jak pole przekroju pierśnicowego drzewa (g), wysokości (h) i w efekcie miąższość pnia (V). Analizie poddano drzewostan sosnowy w Nadleśnictwie Milicz (wydzielenie 236a; wiek 105 lat). Skaning przeprowadzono z 4 stanowisk stosując skaner fazowy FARO LS 880. Dane referencyjne dla średnicy pnia pozyskano tradycyjnymi instrumentami (pierśnicomierz) oraz w oparciu o lotniczy skaning laserowy dla wysokości. Testowano szereg metod i wzorów na obliczenie miąższości grubizny pni 21 drzew, tj.: metodę brył obrotowych (3 różne zestawy par przekrojów: 1.3 /6.0; 2.0/5.0 oraz 2.0/6.0 m nad gruntem) oraz pomiar sekcyjny. Obie bazują na algorytmie określania pola przekroju wycinków pnia metodą otoczki wypukłej. Za referencję przyjęto tzw. wzór empiryczny dla sosny oraz zamiennie pomiar sekcyjny TLS (długość sekcji 0.5m). Stosowano także tradycyjną metodę bazującą na tzw. tablicach miąższości drzew stojących. Wyniki wskazują, iż miąższości uzyskane metodą sekcyjnego pomiaru TLS nie różnią się istotnie statystycznie od stosowanego w praktyce leśnej wzoru empirycznego, a wartości różnic sięgają jedynie 1.5%. W przypadku wzoru na bryły obrotowe, różnice w określaniu miąższości na poziomie powierzchni sięgają od 6.1% (przekroje z wysokości: 2.0/6.0m) do 8.4% (2.0/5.0m;) powodując jej zaniżenie. Wartości maksymalne określone na poziomie pojedynczych drzew różnią się czasem aż o 38.4% (2.0/5.0), co wskazuje na zmienność geometryczną brył pni drzew. Praca potwierdziła przydatność metody pomiaru sekcyjnego TLS oraz potrzebę dalszych prac nad opracowaniem nowych standardów i parametrów w inwentaryzacji lasu oraz konieczność stosowania zautomatyzowanych procesów przetwarzania danych.
The development of geodata acquiring technology has become very fast in recent years and leads to changes in many areas of economy, also in forestry, where new, revolutionary solutions such as terrestrial laser scanning are being implemented. Measurements of such tree characteristics, as the tree height, DBH, taper and the stem volume are subject of a number of studies. Generated sets of data (point clouds) need a chain of automatic processing. This paper describes the application of TLS in forest inventory control, i.e. in determining several parameters such as basal area (g), height (h) and finally the stem volume (V). The 105 years old pine stand in Milicz Forest District was analysed (plot no. 8). Scanning was performed from 4 stations with the use of a FARO LS 880 laser scanner. Reference data were collected using both the traditional instruments (DBH), and airborne laser scanning (h). Several methods and formulas were tested to calculate the stem volume, i.e. methods based on solid of revolution (involving 3 different pairs of cross-sections: 1.3 /6.0; 2.0/5.0 and 2.0/6.0 m above the ground), and sectional measurements. In both methods, the surface area of the crosssections was calculated using the author's algorithm (convex hulls). As the reference, the so-called empirical formula designed for pine was applied, together with volume calculated for 0.5 m sections on TLS point cloud. Traditional methods based on tables with volumes calculated for single trees were also used. The results indicate that volume measurements based on sections do not differ statistically from volumes calculated by means of the empirical formula, while the differences amount to 1.5 % only. As regards the method based on solid of revolution, the differences amount to 6.1% (cross-sections: 2.0/6.0 m, Std. dev 8.0) and 8.4% (2.0/5.0 m) causing the underestimation of the volume. Maximum values, calculated for single trees, are sometimes very high (38.4% for 2.0/5.0 m cross-sections), which indicates geometrical differences in the stem solid. The paper confirmed usability of section measurements within TLS point cloud and the need for further research on defining new standards and parameters for forest inventory control, as well as the necessity of applying automatic algorithms for data processing.
Źródło:
Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2009, 19; 447-457
2083-2214
2391-9477
Pojawia się w:
Archiwum Fotogrametrii, Kartografii i Teledetekcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fungi and minerals occurring in heartwood discolorations in Quercus robur trees
Autorzy:
Przybyl, K
Powiązania:
https://bibliotekanauki.pl/articles/58265.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
heartwood discolouration
dendrology
mineral
trunk heartwood
enzyme
tree
fungi
Quercus robur
oak
Opis:
The studied Quercus robur trees were oaks protected as monuments of nature (200-350 years old) and oaks growing in forest stands (200-300 years old). The most visible symptoms occurring in aboveground organs included defoliation (25-75%), dying of twigs and branches. Discoloured heartwood, obtained with an 80-cm Pressler borer, differed in colour intensity from normal wood and was divided into two groups: stained brown and dark brown. The brown-stained heartwood was a more active site, considering the number of fungi and their ability to produce enzymes (phenoloxidase, pectinase and cellulase) in comparison with the dark-brown-stained heartwood. This brown-stained heartwood contained also statistically more Ca, Mg and Mn.
Źródło:
Acta Societatis Botanicorum Poloniae; 2007, 76, 1
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trzecia łódź jednopienna z Ostrowa Lednickiego
The third dugout boat from Ostrów Lednicki
Autorzy:
Radke, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/531776.pdf
Data publikacji:
2017
Wydawca:
Muzeum Pierwszych Piastów na Lednicy
Tematy:
dłubanka
łódź jednopienna
archeologia podwodna
Ostrów Lednicki
Zakład Archeologii Podwodnej UMK
Muzeum Historii Polski
Muzeum Pierwszych Piastów na Lednicy
metodyka badań podwodnych
dokumentacja podwodna
eksploracja podwodna
eżektor
dugout boat
boat made from a single tree trunk
underwater archaeology
Department of Underwater Archaeology
Nicolaus Copernicus University
Museum of Polish History
Museum of the First Piasts at Lednica
methodology of underwater research
underwater documentation
underwater exploration
ejector
Opis:
In the introduction, this paper refers to two previous actions aimed at extracting dugout boats from the bottom of Lake Lednica (in 1960 and 1982). The main part of the text presents the third action, carried out in 2016 by underwater archaeologists and students from the Department of Underwater Archaeology, Nicolaus Copernicus University. The paper explains the subsequent stages and procedures of investigations. All the difficulties and complications that arose from the circumstances of the deposition, the raw material from which the boat was made and the size of the object are emphasised. As shown by the 1997 study, the boat is made of wood from the lime tree. The boat is now 930 cm in length and 86 cm in width. The bow looks like a slightly oval pyramid; the stern was formed in the shape of a small overhang and could have been about 1 m longer. The dugout has three bulkheads: the first is the same height as the sides, the second one is shorter than the sides by about 6 cm and the third, formed stepwise (?), starts at the same height as the starboard and keeps this height to the crack, after which it is gradually lowered, going down about 5 cm below the port. The average thickness of the starboard is 5.5 cm, while the port is 4.5 cm thick. The thickness of the bottom at the stern break, ranges from 4 cm to 8.5 cm; in other breaks, it reaches as much as 19 cm. The dugout boat is poorly preserved. It has at least nine transverse cracks and one longitudinal crack ending at the first bulkhead. Part of the damage dated certainly back from the period of the destruction of the bridge; however, a thin layer of sediments covering the side or bulkhead wood did not protect the dugout from the anchors of modern fishing boats. The boat was dated using the C14 method (680 ± 120 BP); calibrated, this points to a very wide range of dates, between 980 and 1454. However, a stratigraphic analysis indicates that the boat fell to the bottom sometime between the period the bridge was completed (964) and the last major repair of the bridge captured by dendrochronological analyses (1023). The first stage of the action consisted in the underwater exploration of the bottom deposits with a water-type ejector. This was used for removing the sediments filling the inside of the boat and those within a belt of a small width on the outside of the sides of the dugout, so that they were clearly visible to a height of approx. 10 cm. The boat was filled with a layer consisting of a large number of strongly compacted chips, which produced a few artefacts: 11 potsherds, five bone fragments and a handle of a wooden cup that was preserved in two fragments. After the whole boat had been cleaned, underwater measurements were taken, which enabled the detailed drawing documentation of the dugout in situ. The second stage consisted in cleaning the area outside the boat with 25–30 cm wide and approx. 40 cm-deep trenches running along both sides of the boat and below them. The sides were cleaned gradually, in 2 m long-fragments, to prevent uncontrolled suction of the boat from the bottom and to reduce the possibility of accidental damage. After completing the exploration of each fragment, separated from the others with natural cracks, the released parts were slipped onto a properly prepared tin ‘trough’, surfaced using a buoyancy balloon and transported close to the shore.In the third stage of the campaign, special frames were prepared for each of the nine elements. After the individual parts had been put on the frames in water, they were brought to the surface with them, secured and transported to the Conservation Laboratory in Toruń. After completing all conservation and reconstruction procedures, the dugout boat will be made available to visitors at the Museum of Polish History in Warsaw.
Źródło:
Studia Lednickie; 2017, 16; 81-98
0860-7893
2353-7906
Pojawia się w:
Studia Lednickie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vertical variability of selected macrostructural properties of juvenile wood organization in trunks of Scots pine [Pinus sylvestris L.] trees
Autorzy:
Tomczak, A
Pazdrowski, W.
Jelonek, T.
Stypula, I.
Powiązania:
https://bibliotekanauki.pl/articles/58813.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
Scotch pine
vertical variability
annual ring
plant development
Pinus sylvestris
juvenile wood
tree
botany
maturation
trunk
late wood proportion
axial heterogeneity
Opis:
The study makes an attempt to analyse the width of annual rings, the width of the latewood zone and the proportion of the latewood within juvenile wood along trunks of Scots pine (Pinus sylvestris L.) trees and to verify the hypothesis about the heterogeneous properties of juvenile wood in a single trunk. It was found that the above-mentioned macrostructural elements of wood structure showed a curvilinear correlation with the height of measurement points along the tree trunk. As the distance from the base of trunk increased, the width of the annual ring and the width of the latewood zone decreased, while the proportion of the latewood increased. These types of changes can affect positively physical and mechanical properties of wood tissue. It can be assumed that there is a mechanism which modifies properties of juvenile wood causing axial diversification of the analysed type of wood tissue. It is probable that axial heterogeneity results in advantageous changes in the mechanics of the tree trunk.
Źródło:
Acta Societatis Botanicorum Poloniae; 2007, 76, 1
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tree stand of the old cemetery in Lodz and place of the old cemetery amongst Lodz’s cemeteries along the Lodka river
Drzewostan starego cmentarza w Łodzi i miejsce starego cmentarza wśród łódzkich cmentarzy nad rzeką Łódką
Autorzy:
Otocki, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1041584.pdf
Data publikacji:
2019-03-30
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
drzewostan
obwód pnia
BHT
powierzchnia cmentarza
data założenia cmentarza
Stary Cmentarz w Łodzi
walory przyrodnicze
tree stand
trunk circumference
area of a cemetery
foundation date
the Old Cemetery in Lodz
natural value
Opis:
The article concerns tree stand of the Old Cemetery at Ogrodowa street in Lodz. Circumferences of trees at breast height in the main avenue have been measured. Also circumferences of other old trees in the cemetery and two other cemeteries have been measured. Value of tree stand in the Old Cemetery has been assessed. Assessment of the area and tree stands of former cemeteries in the Lodka valley has been done. Positon and time of foundation of cemeteries in relation to the Lodka River is presented in the paper. The article covers size and distance of cemeteries from the oldest part of agricultural Lodz.
Artykuł dotyczy drzewostanu Starego Cmentarza przy ul. Ogrodowej w Łodzi. W głównej alei zmierzono obwody drzew w pierśnicy. Zmierzono również pierśnice innych drzew na tym cmentarzu, a także na dwóch innych. Dokonano oceny wartości drzewostanu Starego Cmentarza.  
Źródło:
Acta Universitatis Lodziensis. Folia Geographica Socio-Oeconomica; 2019, 35; 5-28
1508-1117
2353-4826
Pojawia się w:
Acta Universitatis Lodziensis. Folia Geographica Socio-Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

    Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies