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Wyszukujesz frazę "forest canopy" wg kryterium: Temat


Tytuł:
Relationship between forest canopy and natural regeneration in the subalpine spruce-larch forest (north-east Italy)
Autorzy:
Marchi, A.
Paletto, A.
Tematy:
relationship
forest canopy
natural regeneration
subalpine forest
spruce-larch forest
canopy closure
canopy cover
Italy
Pokaż więcej
Wydawca:
Instytut Badawczy Leśnictwa
Powiązania:
https://bibliotekanauki.pl/articles/38768.pdf  Link otwiera się w nowym oknie
Opis:
The authors describe the difference between canopy cover (proportion of the forest floor covered by the vertical projection of the tree crowns) and canopy closure (proportion of sky hemisphere obscured by vegetation when viewed from a single point) and the respective ground-based estimation techniques focused on two types of densiometer (GRS tube and spherical). The data collected in the field were used to analyse the relationship between forest canopy and natural regeneration in two subtypes of subalpine larch-spruce forests. The results indicate that in the first subtype characterized by a high fertility and a high canopy cover (around 62%), the level of natural regeneration is low (115 stems per hectare) and it is nearly exclusively composed by spruce [Picea abies (L.) Karst.]. For the second subtype characterized by a low fertility and a medium canopy cover (around 49%) the natural regeneration is rather dense (650 stems per hectare). At last the authors evidence a insignificant difference between the data of forest canopy collected by different ground-based estimation techniques (+0.7% using spherical densiometer compared to using GRS tube densiometer).
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The ecomorphology of Neotropical frugivores
Ekomorfologia neotropikalnych ptaków owocożernych
Acta Ornithologica, vol. 34, no. 2
Autorzy:
Winkler, Hans
Preleuthner, Monika
Współwytwórcy:
Meeting of the European Ornithologists' Union (2 ; 1999 ; Gdańsk)
Polska Akademia Nauk. Muzeum i Instytut Zoologii
Wydawca:
Muzeum i Instytut Zoologii PAN
Powiązania:
Acta Ornithologica
Opis:
S. [141]-148 : il. ; 27 cm
Frugivory is widespread among birds and, at first glance, it is difficult to suggest states of external characters that would separate frugivorous birds from omnivores and carnivores. In the literature it has been suggested that body size and gape width increase with frugivory. It also has been stated that powerful morphological constraints act on behavioural differences among fruit-eating birds. This relates mainly to the way fruits are obtained by the birds, namely either on the wing or from a perch. We analysed behaviour and external morphological characters of Neotropical birds in a lowland rain forest in southern Venezuela to address these problems. Morphologically speaking, frugivores formed an ill defined subset of this avian community. Body size and gape width did not show a consistent relationship with frugivory. Reaching out and down, as well as taking fruits on the wing were the most common techniques used apart from simple gleaning. Body size constrains the evolution of corresponding characters. Evolutionary speaking, there are many roads to frugivory and only careful analyses of behavioural observations, and ecological data, paired with morphological considerations can uncover the general rules behind this diversity.
Bibliogr. s. 147
P. [141]-148 : ill. ; 27 cm
Abstract in Polish
Bibliogr. p. 147
Streszcz. pol.
Referat wygłoszony na Second Meeting of the European Ornithologists' Union
Dostawca treści:
RCIN - Repozytorium Cyfrowe Instytutów Naukowych
Książka
Tytuł:
The effect of forest treefall gap on humus forms in a mixed Fagus orientalis Lipsky (Oriental Beech) forest
Autorzy:
Sajedi, Toktam
Habashi, Hashem
Waez-Mousavi, Seyyed Mohammad
Wydawca:
Instytut Badawczy Leśnictwa, Komitet Nauk Leśnych PAN
Opis:
Gap formation affects environmental conditions in forest ecosystems. In this study, the effect of forest gap on humus form in amixed Fagus orientalis Lipsky (Oriental Beech) forest was investigated by comparing the humus forms found in gaps with those in parts of the stand with closed canopies in atemperate mixed forest in northern Iran. In total, 32 gaps were selected from which 160 humus profiles were considered within gaps, and afurther 160 within adjacent closed canopies. In each profile, humus forms were determined based on their morphological characteristics. Results indicated that gap significantly affected humus forms. The humus forms in gaps differed significantly from those in ad¬jacent areas of closed stand. Mull order type humus was the most commonly found in the study site (70% of all profiles). The results also showed that forest floor thickness was lower in gaps than in adjacent closed areas. The suborder eumull was the most common in gaps, whereas dysmull was found to be the most common within closed areas.
Przemysław Szmit
Dostawca treści:
Repozytorium Centrum Otwartej Nauki
Artykuł
Tytuł:
Determination of the best canopy gap area on the basis of soil characteristics using the Analytical Hierarchy Process (AHP)
Autorzy:
Kooch, Yahya
Hosseini, Seyed Mohsen
Mohammadi, Jahangard
Hojjati, Seyed Mohammad
Wydawca:
Instytut Badawczy Leśnictwa, Komitet Nauk Leśnych PAN
Opis:
The assessment of canopy gap areas on the basis of soil characteristics in forest ecosystems could be one of benefit points for management of forests. This research was conducted in 20 ha areas of Experimental Forest Station of Tarbiat Modares University that is located in a temperate forest of Mazandaran province in the north of Iran. Twenty one canopy gaps with different areas were found in studied areas and classified as small (85.12 m2), medium (325.21 m2), large (512.11 m2) and very large (723.85 m2) gaps. These areas classes of canopy gaps were assessed with respect to nine criteria (soil pH, carbon to nitrogen ratio, cation exchange capacity, phosphorus, potassium, calcium, nitrogen mineralization, microbial respiration and earthworm's biomass). Soil samples (0– 45 cm depth from the gap center and edge positions) were measured in the laboratory. The Analytical Hierarchy Process (AHP) was used for assessment of canopy gap areas. This method is widely used the Multiple Criteria Decision Support (MCDS) method and perhaps the most popular in many fields, including natural resource management, especially in forest sciences. Results of AHP indicate that the maximum of local priority belongs to small areas of canopy gaps when considering all soil characteristics. However, medium, large and very large canopy gap areas have priorities, respectively. The calculated overall priority showed that with respect to considered criterias, small and medium gap areas have higher, more ideal condition in comparison to large and very large areas. AHP results emphasise that considering soil characteristics canopy gap areas should be less than 400 m2 in Hyrcanian forests of Iran. Also, AHP can be introduced as an effective instrument in decision-making processes for investment planning and prioritization in compliance with environmental regulations.
Przemysław Szmit
Dostawca treści:
Repozytorium Centrum Otwartej Nauki
Artykuł
Tytuł:
Different views on tree interception process and its determinants
Autorzy:
Klamerus-Iwan, Anna
Wydawca:
Instytut Badawczy Leśnictwa
Opis:
Przemysław Szmit
The subject of the study is the process of interception by plants defined as the process of retaining rainfall water on plant surface, counting retention by individual plant parts or the vegetation cover as the whole. In the quantitative approach, interception capability of plants may be compared to a reservoir, the capacity of which is determined mostly by the surface of plants. Among many approaches to describe interception processes, a lot of attention has been focused on research concerning the forest vegetation with reference to atmosphere – forest stand – soil balance. Hence, in the present paper interception issues are addressed in view of forest ecosystems. The emphasis is also put on the methods and results of studies carried out under laboratory conditions. . Up-to-date literature on interception is abundant. The authors tackling this issue regularly define their own variable and complex sets of terms. This paper is an attempt to review and organize knowledge presented in existing literature on the subject.
Dostawca treści:
Repozytorium Centrum Otwartej Nauki
Artykuł
Tytuł:
Modelowanie chmury punktów ze skaningu laserowego w obszarze koron drzew
The lidar point cloud data-based forest canopy modelling
Autorzy:
Wężyk, P.
Tematy:
lotniczy skaning laserowy
ALS
inwentaryzacja lasu
wysokość drzew
podstawa korony
powierzchnia warstwy koron
objętość warstwy koron
forest inventory
tree height
canopy base
canopy surface
canopy volume
Pokaż więcej
Wydawca:
Stowarzyszenie Geodetów Polskich
Powiązania:
https://bibliotekanauki.pl/articles/130582.pdf  Link otwiera się w nowym oknie
Opis:
Celem pracy było określenie przydatności i zaproponowanie rozwiązań automatyzacji procesu określania wybranych parametrów taksacyjnych drzewostanów związanych z koronami drzew, w oparciu o dane z lotniczego skaningu laserowego (ALS). Analiza przydatności danych ALS bazuje na pomiarach referencyjnych 432 sosen w obszarze badawczym Milicz (RDLP Wrocław). Osiągnięte wyniki wskazują, iż: (1) wysokość pojedynczych drzew określona na podstawie modelowanej chmury punktów ALS w zależności od użytego algorytmu, prowadzi do niewielkiego zaniżenia wartości (średnia różnica -0.90 m CHM1 lub -0.12 m CHM2); (2) średnia wysokość analizowanych drzewostanów na powierzchniach kołowych określana na podstawie ALS, była wyższa (+0.85 m) od wartości zapisanych w bazie danych SILP (2005) co w efekcie prowadzić może do zaniżenia zasobności drzewostanów w całym obrębie; (3) automatycznie analizowana średnia wysokość drzewostanów sosnowych (95 centyl FE) była wyższa o +0.46 m w stosunku do danych z SILP; (4) automatycznie określona podstawa korony sosny wykazuje błąd zaledwie około 0.56 m; (5) analiza histogramów chmury punktów umożliwiła określenie długości korony z przeszacowaniem o +0.44 m w stosunku do danych referencyjnych; (6) modelowanie warstwy koron otwiera dyskusje na temat homogeniczności jednowiekowych i jednogatunkowych pododdziałów oraz istniejącego podziału przestrzennego. Nowa metoda inwentaryzacji leśnej bazująca na technologii pozyskiwania danych ALS i modelowaniu chmury punktów ma duże szanse na wdrożenie w lasach Polski o powinno przynieść ze sobą wzrost dokładności jak i obniżyć koszty prac urządzeniowych.
The study was aimed at determining the utility of and to improve the understanding of the airborne laser scanning (ALS) technology in acquisition of selected parameters of canopy layers for individual trees and whole stands. This approach, based on ALS data (TopoSys fiber scanner; swing mode + optical line scanner), was compared with reference data drawn from a forest inventory (432 Scots pines). The study showed that: (1) the height of a single tree, as derived from ALS data, leads to underestimation (mean difference -0.90 m or +0.12 m depending on CHM generation algorithm); (2) the mean stand height was higher (+0.85 m) than the height recorded in the SILP database, which may result in underestimation of the timber volume in the entire Milicz forest district; (3) the stand mean height (understood as 95th percentile of the FE point cloud) was +0.46 m higher than the height recorded in the SILP inventory database; (4) it was possible to estimate the canopy base with 0.56 m overestimation; (5) the canopy length as measured during the forest inventory was +0.44 m lower compared to the ALS data (histogram analysis); (6) the homogeneity of a contemporaneous-pine stand is questionable. In a very near future, a new approach to the forest inventory, supported by ALS data, will be presented as a list of new parameters and guidelines.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aerosol interception by forest in industrialized region
Aerosol interception by forest canopy in a highly industrialized region
Autorzy:
Kwiecień, Małgorzata
Współwytwórcy:
Polska Akademia Nauk. Instytut Ekologii
Wydawca:
Polish Scientific Publishers
Powiązania:
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18. Swank W. T., Henderson G. S. 1976 - Atmospheric input of some cations to forest ecosystems in North Carolina and Tennesee - Water Resourc. Res. 12: 541-546.
16. Sehmel G. A. 1980 - Particle and gas dry deposition: a reviev - Atmosph. Environ. 14: 983-1011.
5. Eriksson E. 1966 - Air and precipitation as sources of nutrients (In: Handbuch dcr Pflanzenernahrung und Dungung, Band II, Eds. K. Scharrer, H. Linser) - Wien, 774-792.
10. Likens G. E., Bormann F. H., Pierce R. S., Eaton J. S., Johnson N. M. 1977 - Biogeochemistry of a forested ecosystem - Springer-Verlag. New York-Heidelberg-Berlin, 146 pp.
6. Gmur N. F., Evans L. S., Cunnigham 1983a - Effects of ammonium sulfate aerosols on vegetation - II. Mode of entry and responses of vegetation - Atmosph. Environ. 17: 715-721.
23. Wiman B. L. B., Agren G. I., Lannefors H. O. 1985 - Aerosol concentration profiles within a mature coniferous forest - model versus field results - Atmosph. Environ. 19: 363-367.
22. Wiman B. L. B., Agren G. I. 1985 - Aerosol depletion and deposition in forest - a model analysis - Atmosph. Environ. 19: 335-347.
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24. Wiman B. L. B., Lannefors H. O. 1985 - Aerosol characteristics in a mature coniferous forest - methodology, composition, sources and spatial concentration variations - Atmosph. Environ. 19: 349-362.
Ekologia Polska
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21. White E. J., Turner F. 1970 - A method of estimating income of nutrients in a catch of airborne particles by woodland canopy - J. appl. Ecol. 7: 441-459.
13. Mayer R., Ulrich B. 1977 - Acidity precipitation as influenced by filtering of atmospheric sulphur and nitrogen compounds - Its role in the element balance and effect on soil - Water, Air, Soil Pollut. 7: 409-416.
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20. White E. J. 1969 - Aspects of nutrient income to the forest ecosystem and of the nutrient cycle within the forest - M. Sc. Thesis, University of Wales.
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4. Chamberlain A. C., Chadwick R. C. 1966 - Transport of iodine from atmosphere to ground - Tellus, 18: 226-237.
Opis:
Streszczenie w języku polskim
Strony 561-577 : ilustracje ; 24 cm
This is a new method of estimating aerosol interception by forest canopy. The aerosols trapped by the canopy of a pine-oak forest (Pino-Quercetum association) averaged 199.22 kg · ha-1, vegetation season-1 which was equal to 40.52% of all inorganic dust fall on the forest floor. The aerosols were an additional source of elements, e.g. of nitrogen -15.07 kg · ha-1 · vegetation season-1. At the same time the mean input of nitrogen from the atmosphere was 15.26 kg · ha-1 · vegetation season-1 in the heavier dust fraction and in rain.
Bibliographical references (pages 576-577)
Pages 561-577 : illustrations ; 24 cm
Abstract in Polish
Bibliografia na stronach 576-577
Dostawca treści:
RCIN - Repozytorium Cyfrowe Instytutów Naukowych
Książka
Tytuł:
Influence of species composition and forest age
Influence of species composition and forest age on leaf area index
Autorzy:
Kram, Karol J.
Współwytwórcy:
Polish Academy of Sciences. Institute of Ecology
Wydawca:
Polish Academy of Sciences. Institute of Ecology. Publishing Office
Powiązania:
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Polish Journal of Ecology
13. Kira T., Kumara A. 1983 - Dry matter production and efficiency in various types of plant canopies (In: Plant Research and Agroforestry, Ed. P. A. Huxley) - Pillans & Wilson, Edinburgh, 347-364.
Opis:
Pages 75-88 : illustrations ; 27 cm
Investigations of leaf area index (LAI) were performed in forest stands of pine, beech as well as birch, alder, spruce, larch and oak using the LAI-2000 Plant Canopy Analyser made by American corporation LI-COR. Canopy LAI has been found to differ considerably depending on both dominant tree species and stand age. From among the species examined spruce exhibited the highest LAI amounting to 10.0 m2 m-2, where other species had much lower LAI-s (within a range 1.6-6.3 m2 m-2). Canopy LAI increased rapidly in young stands attained a peak at approximately age 20 and decreased slowly thereafter. It has been revealed that projected leaf area of an individual tree increases linearly as the tree grows older.
Strony 75-88 : ilustracje ; 27 cm
Bibliografia na stronach 87-88
Bibliographical references (pages 87-88)
Dostawca treści:
RCIN - Repozytorium Cyfrowe Instytutów Naukowych
Książka
Tytuł:
The role of topography, canopy gaps, and forest edges in the distribution of windthrow damage in the Western Tatra Mountains, Poland
Geographia Polonica Vol. 92 No. 2 (2019)
Autorzy:
Strzyżowski, Dariusz. Autor
Wydawca:
IGiPZ PAN
Powiązania:
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Opis:
24 cm
Windthrows are ubiquitous in forest environments, and they lead to many ecologic, pedologic, and geomorphic consequences. The distribution of wind damage is not uniform, and may be controlled by many factors. This study examines the role of topography, canopy gaps, and forest edges in the distribution of windthrow damage within the Polish part of the Western Tatra Mountains (121.7 km2 ). A set of aerial photographs was used to map windthrows created in 4 different periods: before 2009, 2009-2012, 2012-2014, and 2014-2015. GIS mapping, image classification, and t-test were applied to analyze the data. Among all topographic characteristics, the highest diversification of windthrow distribution was observed in the case of aspect, which was probably connected with different wind directions in analyzed periods. Slope and elevation also controlled damage distribution, mainly by a decreased damage within the steepest slopes and the highest elevations. Canopy gaps did not influence damage distribution significantly. Forest edges, particularly those created by recent windthrow, were the most important factor influencing the distribution of wind damage.
Dostawca treści:
RCIN - Repozytorium Cyfrowe Instytutów Naukowych
Książka

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