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    Wyświetlanie 1-12 z 12
    Tytuł:
    A study on the butterfly diversity of Haldia industrial belt and adjacent rural area in Purba Medinipur district, West Bengal, India
    Autorzy:
    Pahari, Priti Ranjan
    Mishra, Niladri Prasad
    Sahoo, Abhijit
    Bhattacharya, Tanmay
    Powiązania:
    https://bibliotekanauki.pl/articles/1177940.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Butterfly diversity
    dominance and similarity indices
    ecological indicator
    effect of industrialization
    evenness
    Opis:
    67 species of butterflies under 5 families and 51 genera were recorded from Haldia industrial beltand adjacent rural area. Industrial zone hadfewer species low diversity and evenness indices and high dominance index. Nymphalidae outnumbered all other families in the industrial zone with 48% of the total species of that area. Such preponderance of any single family was not evident in the rural area, likewise industrial belt had 3 dominant species but no dominant species could be seen in the rural zone. Results suggest that industrialization could alter the butterfly diversity but it was not enough to make the two sites dissimilar as revealed by the index of similarity (0.52).
    Źródło:
    World Scientific News; 2018, 97; 207-224
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of diatoms to assess the quality of the waters of the Baryczka stream, left-side tributary of the River San
    Autorzy:
    Noga, T.
    Stanek-Tarkowska, J.
    Kochman, N
    Peszek, Ł.
    Pajączek, A
    Woźniak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/123267.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    diatoms (Bacillariophyceae)
    diatoms indices IPS
    GDI
    TDI
    water quality
    diversity
    ecology
    Baryczka stream
    Opis:
    The Baryczka stream is a small (about 20 km long), left bank tributary of the River San (Podkarpackie Voivodeship). Studies on diversity of diatom communities using OMNIDIA software were conducted in 2010 and 2011. Diatomaceous indices IPS, GDI and TDI and Van Dam et al. classification system were used for water quality assessment. Planothidium lanceolatum, Cocconeis placentula var. lineata, Achnanthidium minutissimum var. minutissimum, Nitzschia linearis, Rhoicosphenia abbreviata, Navicula lanceolata and Naicula gregaria were the most numerous. Values of the IPS index indicate good water quality (II–III class). Based on the GDI index, waters of the Baryczka stream were classified to III class water quality. The TDI index indicated poor and bad ecological state on the most sampling sites. On all sampling sites alaliphilous (pH>7) diatoms taxa predominated. The most common were eutraphentic and hypereutraphentic diatoms. With respect to trophy, it was shown that α- and β-mesosaprobous diatoms were the most common (III and II class water quality).
    Źródło:
    Journal of Ecological Engineering; 2013, 14, 3; 8-23
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comics und graphic novels im multikulturellen Deutschunterricht
    Autorzy:
    Kuzminykh, Ksenia
    Powiązania:
    https://bibliotekanauki.pl/articles/915238.pdf
    Data publikacji:
    2014-01-01
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    comics
    graphic novels
    visual literacy
    reading comprehension
    methods
    semiotic diversity
    icons
    symbols
    indices
    Opis:
    This essay examines how comics and graphic novels can be used in multicultural German-language-lessons. It demonstrates the correlation between visual literacy and reading comprehension and shows different methods – analytical, productive and creative. Furthermore it focuses on the language of comics and on their semiotic diversity.
    Źródło:
    Glottodidactica. An International Journal of Applied Linguistics; 2014, 41, 2; 75-85
    0072-4769
    Pojawia się w:
    Glottodidactica. An International Journal of Applied Linguistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Czy naturalne procesy ekologiczne w juwenilnej fazie rozwoju drzewostanu założonego sztucznie różnicują jego strukturę przestrzenną?
    Do natural processes at the juvenile stage of stand development differentiate the spatial structure of trees in artificially established forest stands?
    Autorzy:
    Szmyt, J.
    Korzeniewicz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1317220.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    ekologia lasu
    drzewostany sosnowe
    drzewostany debowe
    wiezba poczatkowa
    procesy ekologiczne
    wydzielanie sie drzew
    drzewa lesne
    sosna
    dab
    rozmieszczenie drzew w przestrzeni
    piersnice drzew
    wysokosc drzew
    dlugosc korony
    spatial indices
    forest diversity
    self-thinning
    managed forests
    Opis:
    Structural diversity is one of the most interesting phenomena that have been studied by forest ecologists and practitioners. Amongst the different characteristics of forest structure, spatial diversity of trees and their attributes seem to be very important. The more spatially structured a population is, the higher its diversity in terms of size and species richness. Because most forests in Europe are managed and were artificially established, they are subjected to conversion processes turning them into more complex systems. The approach presented here aims at elucidating whether natural processes, such as self-thinning, can cause the self-differentiation of spatial structure in artificially planted stands. Our analyses focused on untended Scots pine and pedunculate oak stands in the juvenile phase of development and were based on spatially explicit structural indices for positioning and size differentiation (diameter, total height and crown length). The obtained results indicate that live trees were dispersed more or less regularly. Unlike the anglebased index, which mostly indicated randomness in tree location, a distance-based index showed clear regularity. We also found that the distribution of tree attributes auto-correlates to tree location as indicated by significantly lower index values compared to values resulting from random reassignment of the examined attributes. This low degree of spatial differentiation is further confirmed by the distribution of indices in differentiation classes. Our results allow us to conclude that, in the case of light demanding species (pine and oak), natural processes do not increase spatial diversity of the stand, although, both species showed a certain degree of deviation in this respect.
    Źródło:
    Leśne Prace Badawcze; 2014, 75, 2; 171-179
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ornithocomplex changes of the pine-oak forest due to the participation of the introduced population of Quercus rubra L.
    Zmiany ornitokompleksu boru sosnowo-dębowego zawiązane z udziałem wprowadzanej populacji Quercus rubra L.
    Autorzy:
    Gaychenko, Vitaly
    Shupova, Tatiana
    Illienko, Volodymyr
    Powiązania:
    https://bibliotekanauki.pl/articles/27322936.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Pomorski w Słupsku
    Tematy:
    α-diversity indices
    ornithocomplex
    pine-oak plantation
    Quercus rubra L.
    Opis:
    To date, the issues of the Quercus rubra L. ecological niche formation, adaptation of its introduced populations, competition with populations of native trees in the secondary range forests remain open. Purpose: to conduct an inventory of the pine-oak forests ornithocomplex with the participation of the population of Q. rubra on the territory of the Boyarka Forestry Research Station (Ukraine), to give a comparative analysis of the pine-oak forests ornithocomplexes with Q. rubra and Q. robur as a result of the participation of the introduced species in the conditions transformation of birds habitats. It was revealed that because of the replacement of native Q. robur with adventive Q. rubra in pine-oak plantations, a significant decrease in the species composition (from 24 to 15 species) occurs in ornithocomplexes during the nesting period. The value of the Sorensen index for model ornithocomplexes is 0.62. The average number of birds in both cultural phytocenoses is similar: 2.59 ± 0.50 individuals/km of the account line in subors with Q. robur and 2.51 ± 0.57 individuals/km with Q. rubra. The replacement of Q. robur with Q. rubra does not significantly affect the value of the synanthropization index (0.46 with Q. robur and 0.47 with Q. rubra); does not adversely affect ground-nesting species (L. arborea, A. trivialis, T. troglodytes, Ph. trochilus, Ph. sibilatrix), indicating the presence of nesting stations for vulnerable species. Parus major L., Phylloscopus collybita Vieillot, Ph. sibilatrix species dominate in the forest without introduced trees; with Q. rubra – species Turdus pilaris L., P. major, Anthus trivialis L. predominate. Both types of pineoak plantations provide a full-fledged food resource for birds feeding on invertebrates and mixed feeds. The absence of predator birds, especially hawks, in the forest with Q. rubra is most likely due to the depletion of the food supply due to a smaller species composition and a smaller number of prey. As a result, predators visit subors with Q. rubra less often. The data of all species diversity indices are significantly higher for ornithocomplexes of model pine-oak forests with Q. robur. Dominance indexes data do not include synchrony (Simpson index data are stable, Berger–Parker index is higher in stands with Q. rubra, and McIntosh index – with Q. robur respectively). The data for the indices of species distribution uniformity are close.
    Źródło:
    Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2021, 25; 9-18
    1643-0115
    Pojawia się w:
    Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rola poszczególnych gatunków drzew w kształtowaniu złożonej budowy pionowej w starodrzewach liściastych Puszczy Niepołomickiej
    Role of tree species in the formation of a complex vertical structure of deciduous old-growth forests in the Niepolomice Forest
    Autorzy:
    Bartkowicz, L.
    Kołodziej, Z.
    Pach, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/989716.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    starodrzew
    struktura drzewostanu
    struktura wysokosci
    drzewa lesne
    gatunki lasotworcze
    Puszcza Niepolomicka
    oak−hornbeam forest
    riparian forests
    structural diversity indices
    ecological mechanisms
    Opis:
    The objective of the study was to compare the seven tree species in terms of their role in the formation of a complex vertical structure in mixed broadleaved stands. The data came from 18 multi−storey old−growth forests representing different communities of lowland deciduous forests in the Niepołomice Forest. In each stand, squared sample plot (80×80 m) was established. The height of trees of dbh≥7 cm was measured. Then, for each studied species, values of the two structural indices were determined. The structural diversity index (ZS) quantifies tree height variation within individual population, whereas the index of structure−forming role (RS) expresses the contribution of the given population into vertical structural diversity of the whole stand. The greatest tendency to form a population with a large height diversity belonged to Tilia cordata, Fraxinus excelsior and Ulmus laevis. Significant opportunities in this regard, however, were exhibited by other tree species, including shade−intolerant Pinus sylvestris and Alnus glutinosa. This phenomenon in the conditions of eutrophic habitats, with the constantly present competitive pressure from shade−tolerant species, should be considered as an exceptional. A major contribution to vertical structural diversity of the stand was often an attribute of the populations with a low internal height diversity, which concerned especially Quercus robur. This means that an important ecological mechanism responsible for the formation of a multi−layer canopy is complementary filling the space above ground by trees of the species with different light requirements. However, the lack of correlation between RS and ZS indices suggests that the ability of particular species to form the population with a high internal diversity is equally important. The results prove the possibility of forming stands with a very complex vertical structure in the conditions of lowland mixed deciduous forests. However, in terms of sustainable maintenance of such stand structure, the issue of the growth rate of trees at different competitive pressure and the nature of their response to the release at different stages of ontogeny remains open.
    Źródło:
    Sylwan; 2015, 159, 08; 650-657
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Różnorodność gatunkowa jako wskaźnik przemian roślinności w bieszczadzkiej kwaśnej buczynie górskiej
    Plant species diversity as an indicator of vegetation changes in acidophilous mountain beech forest
    Autorzy:
    Durak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/973949.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    Bieszczady Zachodnie
    leśnictwo
    zbiorowiska leśne
    zmiany użytkowania
    kwaśna buczyna górska
    runo leśne
    róznorodność gatunkowa
    wskaźnik równomierności
    liczba gatunków
    wskaźnik Shannona H
    diversity indices
    evenness index
    changes in forest
    forest regeneration
    eastern carpathians
    Opis:
    The intensity of disturbance plays a key role in shaping the biodiversity and hence it is a good tool for assessing community changes occurring in the Western Bieszczady, an area depopulated after World War II. Based on sampling of acidophilous mountain beech forest phytocoenosis repeated after 50 years, an analysis of plant biodiversity changes was conducted. The study focused on changes in the number of species, Shannon’s indicator, spatial distribution and coverage of specific ecological groups of species. The results confirm an undergoing process of regeneration of straitened phytocoenoses from 1958−1961, in which a slow improvement of the trophic conditions can be observed.
    Źródło:
    Sylwan; 2011, 155, 12; 843-850
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spider Faunal Diversity of Barasat and Basirhat, 24 Parganas, West Bengal, India
    Autorzy:
    Saha, Sumana
    Das, Indranil
    Raychaudhuri, Dinendra
    Powiązania:
    https://bibliotekanauki.pl/articles/1113472.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Barasat
    Basirhat
    Distribution
    Diversity Indices
    India
    New record
    North 24 Parganas
    Spiders
    West Bengal
    Opis:
    The present study is on the spider fauna of Barasat and Basirhat of North 24 Parganas, West Bengal, India. A total of 23 species belonging to 20 genera and 11 families are sampled during the period August 2016 to July 2017. These include the newly recorded species, Anepsion maritatum (O.P. Cambridge) from the state. The dominant guild is constituted by the Orb web weavers (30.43%). Analysis of their zoogeographical distribution reveals that the fauna apart from being Oriental also includes some Australian (23%), Palaearctic (21.73%) and Ethiopian, Nearctic and Neotropical (each 17.39%) elements. Spiders are mostly prevalent during Postmonsoon (82.60%), followed by Premonsoon (60.86%) and Monsoon (47.82%) which is in conformity with the incidence of the insect species. Two species namely Eriovixia excelsa (Simon) and Leucauge decorata (Blackwall) are recorded throughout the period of survey. All the diversity indices are higher in case of Basirhat as compared to Barasat. An overall negative impact of urbanization on spider diversity, distribution and abundance is evidenced from the present study. Ranking sequence of the most abundant species (six) in descending order are: Leucauge decorata (25.68%) > Eriovixia excelsa (19.13%) > Pholcus phalangioides (11.48%) > Plexippus paykullii (8.74%) > Anepsion maritatum (7.10%) > Cyrtophora cicatrosa (6.56%). Sex ratio (♀ : ♂) is about 12 : 1. Availability of food/season and/or cannibalism may be the factors for female dominated society.
    Źródło:
    World News of Natural Sciences; 2017, 15; 49-85
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of diatoms to asses water quality of anthropogenically modified Matysówka stream
    Autorzy:
    Noga, T.
    Stanek-Tarkowska, J.
    Peszek, Ł.
    Pajączek, A
    Kowalska, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/123641.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    diatoms
    diversity
    diatom indices IPS
    GDI
    TDI
    water quality
    Matysówka
    Opis:
    Matysówka stream is small, under 6 km long watercourse, which is a right-bank tributary of Strug River. In 2009–2011studies on the subject of diversity of diatom communities using diatom indices IPS, GDI and TDI for water quality assessment were conducted. On the stream 271 diatom taxa were identified, among which: Achnanthidium minutissimum var. minutissimum, Navicula cryptotenella, N. gregaria, N. lanceolata, N. tripunctata, Nitzschia linearis, N. pusilla, N. recta, Planothidium frequentissimum, Rhoicosphenia abbreviata were the most frequent. Middle and lower section of Matysówka stream was characterized by increased concentrations of phosphates, nitrites, ammonium, total phosphorus and nitrogen, BOD5. On the basis of diatom indices IPS and GDI waters were characterized as III–IV quality classes, while the TDI index revealed the worst water quality classes (IV–V).
    Źródło:
    Journal of Ecological Engineering; 2013, 14, 2; 1-11
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykorzystanie okrzemek (bacillariophyta) do oceny jakości wód rzeki Białej Tarnowskiej
    The use of diatoms (bacillariophyta) to assess water quality of Biała Tarnowska River
    Autorzy:
    Noga, T.
    Stanek-Tarkowska, J.
    Pajączek, A.
    Peszek, Ł.
    Kochman-Kędziora, N.
    Irlik, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/401526.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    okrzemki
    różnorodność
    indeksy IPS
    GDI
    TDI
    diatoms
    diversity
    indices IPS
    Opis:
    Rzeka Biała Tarnowska jest prawobrzeżnym dopływem Dunajca. Wypływa z Beskidu Niskiego, płynie na granicy Pogórza Rożnowskiego i Ciężkowickiego, następnie uchodzi do Dunajca na terenie Niziny Nadwiślańskiej. Celem niniejszej pracy było zbadanie różnorodności okrzemek na poszczególnych stanowiskach oraz próba oceny zanieczyszczenia rzeki z wykorzystaniem okrzemek jako wskaźników jakości wód. Wody rzeki Biała Tarnowska charakteryzowały się odczynem zasadowym lub zbliżonym do obojętnego. Wartości stężeń azotanów wskazywały na II klasę jakości, jedynie na ostatnim stanowisku (5) mieściły się w normach odpowiadających I klasie. Na stanowiskach wyznaczonych wzdłuż biegu rzeki zidentyfikowano łącznie 205 taksonów okrzemek. Najbogatszymi w gatunki rodzajami były: Nitzschia (29), Navicula (21) oraz Gomphonema (15). Najczęściej występującym dominantem było Achnanthidium pyrenaicum (Hust.) Kobayasi. Bardzo liczne populacje tworzyła także Navicula lanceolata (Agardh) Kütz., w dolnym biegu rzeki, na dwóch ostatnich stanowiskach. Celem określenia statusu ekologicznego rzeki Białej Tarnowskiej wykonano analizę struktury zbiorowisk okrzemek. Wyniki analiz przedstawiono za pomocą wybranych indeksów okrzemkowych. Według indeksu IPS Biała Tarnowska posiada dobry status ekologiczny (II klasa) na większości badanych stanowisk. Wartości wskaźnika TDI przedstawiały się najgorzej w klasyfikacji i wskazywały najczęściej na wody słabej i złej jakości (IV i V klasa) zwłaszcza w środkowym i dolnym biegu.
    The Biała Tarnowska River is a right-bank tributary of Dunajec. It flows from the Low Beskid Mountains, flowing on the border of Ciężkowickie and Rożnowskie foothills and then flows into the Dunajec on the territory of Vistula Lowland (Nizina Nadwiślańska). The aim of this work was to investigate the diatoms diversity at the individual sites and attempt to evaluate pollution of the river with the use diatoms as water quality indicators. The waters of Biała Tarnowska River were characterized by alkaline or circumneutral pH. Values of nitrates concentration indicated II water quality class, only at the last site (5) corresponded to the standards for the I class. At the studied sites located along river course 205 diatom taxa were identified. The riches in species were genera: Nitzschia (29), Navicula (21) and Gomphonema (15). The most popular dominant was Achnanthidium pyrenaicum (Hust.) Kobayasi. Very numerous communities were created by Navicula lanceolata (Agardh) Kütz, at the lower current of river, on two last sites. In order to determine the ecological status of Biała Tarnowska River the analysis of the diatom assemblages structure was performed. The results of the analysis were shown by the selected diatomaceous indices. According to IPS index Biała Tarnowska has a good ecological status (II class) at the most of study sites. Values of TDI index were the worst and indicated poor and bad water quality (IV and V class) especially in middle and lower current.
    Źródło:
    Inżynieria Ekologiczna; 2015, 42; 17-27
    2081-139X
    2392-0629
    Pojawia się w:
    Inżynieria Ekologiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Znaczenie starodrzewu dla zachowania różnorodności porostów w lasach na przykładzie pozostałości Puszczy Mazowieckiej
    The significance of old-growth forests in maintaining lichen diversity - an example from the remnants of the Mazovian Forest
    Autorzy:
    Kubiak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1318694.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lichenologia
    Mazowsze
    Nadlesnictwo Ciechanow
    fragmentacja lasow
    rezerwaty przyrody
    rezerwat Lekowo
    rezerwat Modla
    starodrzew
    porosty
    Lichenes
    roznorodnosc gatunkowa
    sklad gatunkowy
    zachowanie roznorodnosci biologicznej
    lichens
    species diversity
    fragmentation
    nature conservation
    forest management
    lichen indices
    Opis:
    The paper presents the results of a lichenological study conducted in 2012 in the 'Lekowo' forest complex, situated in the north-western part of Mazovia (Forest Division of Ciechanów). It is the largest forest complex in the area, covering 1596 ha. The research area comprises two small nature reserves ('Lekowo' – 5.31 ha, and 'Modła' – 9.36 ha) with old-growth oak trees (160–200 years of age) and adjacent managed pine forests (76-107 years of age). The aim of this study was to investigate the species composition of the lichen biota in both reserves and to determine the role of nature reserves in preserving lichen diversity. Results of the study showed that old-growth stands, in particular those composed of oak trees above recommended felling age, provide habitats for a large group of stenotopic forest lichens which are absent in managed forests. The 'Lekowo' and 'Modła' nature reserves, despite their small areas, are valuable refuges that help to conserve remarkable lichen diversity at the local scale, and serve as potential diaspore sources for many rare and threatened lichen species.
    Źródło:
    Leśne Prace Badawcze; 2013, 74, 3; 245-255
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zróżnicowanie strukturalne wybranych drzewostanów dębu szypułkowego (Quercus robur L.) występujących na terenie Płyty Krotoszyńskiej
    Structural diversity of selected oak stands (Quercus robur L.) on the Krotoszyn Plateau in Poland
    Autorzy:
    Szmyt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1293390.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    Plyta Krotoszynska
    drzewa lesne
    dab szypulkowy
    Quercus robur
    drzewostany debowe
    struktura drzewostanu
    zroznicowanie strukturalne
    wskazniki zroznicowania
    structural diversity of forest
    structural indices
    Krotoszyn Pleteau
    Opis:
    The oak forests growing on the Krotoszyn Plateau are the biggest and most valuable oak forest complexes in Poland. The purpose of this study was to analyze the structural diversity of oak (Q. robur L.) stands older than 140 years. Two natural stands located within the forest reserve as well as two managed stands were chosen for investigation. Species and tree size diversity were analyzed using different measures and spatially explicit and inexplicit indices. The results indicate that the structural diversity of the protected oak forests did not differ significantly from that of managed stands. On the contrary, undisturbed natural processes in protected forests can result in a low diversity of some structural attributes in such stands. Although most indices pointed towards a higher structural diversity in protected forests, the differences were not large, especially in the case of spatially explicit indices. The spatial arrangement of live trees was either random, aggregated or regular, with the latter clearly dominating managed, poorly mixed oak stands. Furthermore, a lack of natural disturbances strong hornbeam expansion, in which case strict protection is not favorable for oak sustainability as it creates unsuitable conditions for oak regeneration beneath the hornbeam canopy.
    Źródło:
    Leśne Prace Badawcze; 2017, 78, 1
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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