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    Wyświetlanie 1-12 z 12
    Tytuł:
    Formation of European beech stands (Fagus sylvatica L.) that involve Scots pine (Pinus sylvestris L.) in tree species composition in the Ukrainian Roztochie
    Autorzy:
    Myklush, Y.
    Myklush, S.
    Debryniuk, I.
    Hayda, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2106641.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    forest management
    forest typology
    site condition
    European beech
    Fagus sylvatica
    stand
    tree species composition
    Ukrainian Roztocze
    Opis:
    Productive European beech stands (Fagus sylvatica L.) involving Scots pine (Pinus sylvestris L.) are formed in Ukrainian Roztochie. Considering value and limited distribution of beech stands involving pine in tree species composition, it is necessary to work out and implement measures for their natural restoration in connection with the climate change and the efficient use of raw materials and non-wood products. Main forestry and management indices of beech stands that include pine in tree species composition were analysed. Forestry activities that are currently carried out in middle-aged and maturing stands significantly reduce their relative completeness and growing stocks, as determined by comparing growth particularities of productive beech stands from different sources.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2022, 64, 2; 83-89
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Main forestry and management indices of pine (Pinus sylvestris L.) stands involving beech (Fagus sylvatica L.) in composition of Ukrainian Roztochchia
    Autorzy:
    Myklush, Yuriy
    Myklush, Stepan
    Havryliuk, Serhii
    Savchyn, Volodymyr
    Powiązania:
    https://bibliotekanauki.pl/articles/2041218.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    forest typology
    site conditions
    pine stands
    Pinus sylvestris L.
    beech stands
    Fagus sylvatica L.
    tree species composition
    Opis:
    As of 2019, the total area of forest stands with the varying proportion of Scots pine (Pinus sylvestris L.) and beech (Fagus sylvatica L.) in composition on the Ukrainian Roztochchia was 11,251.3 ha and the area of pine stands involving European beech in composition was 6879.5 ha. Pine stands involving beech in composition are formed on the fresh, moist and boggy relatively pure and relatively rich soil condition. Pine forest stands (average share of pine exceeds 56%), which include beech in composition occupy more than 80% of the total area of interest. Mature and overmature forest stands dominate most of the landscape. More than 85% of stands are characterized by an average relative completeness. Undergrowth of deciduous tree species, which is mainly formed by European beech or hornbeam (Carpinus betulus L.) and rarely by common oak (Quercus robur L.) or sycamore maple (Acer pseudoplatanus), is available under a canopy of middle-aged, ripening and mature stands. The study points to the need to rethink forest management approaches and eventually to use such methods of forest cuttings that ensure natural regeneration not only of a European beech and common oak, but primarily of a pine. The practice of creating pine plantations in such conditions favourable for its growth and development should be used only in those cases when it is impossible to achieve natural regeneration of pine.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2021, 63, 2; 81-87
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability Assessment and Composition of Tree Species in Nigerian University
    Autorzy:
    Chukwu, Onyekachi
    Chenge, Iveren B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1178080.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Tree stability
    slenderness coefficient
    species composition
    windthrow
    Opis:
    Wind remains a strong abiotic agent associated with damages of forest trees. The vulnerability of a tree to windthrow is highly influenced by the ratio of tree total height to its stem diameter (RHD). However, RHD has been identified as an index and measure of tree and stand stability. This study assessed the stability and composition of open grown tree species in the University of Ibadan, Nigeria. Diameter at breast height (Dbh) and total height (THt) of one hundred and thirty-nine (139) trees species with Dbh ≥5.0 cm found within three departments of the University were measured. A total of 36 species from 17 families were identified with Myrtaceae and Combretaceae families having highest (28.8% and 21.6%, respectively) numbers of tree. RHD was found to have negative correlation with all the tree growth variables investigated except THt. However, this study reveals that about 79 % of the trees found in the study area had RHD <80, indicating stable and low risk or susceptibility to windthrow, wind-induced bending and breakage. Hence, trees with RHD >80 (21%) were recommended for felling as they pose threat to human life and properties in the study area.
    Źródło:
    World Scientific News; 2018, 95; 235-245
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using FORDRY model to forecast transformation of Norway spruce (Picea abies (L.) Karst.) stands in Nadsyansky Regional Landscape Park (Ukrainian Carpathians)
    Autorzy:
    Kozak, Ihor
    Parpan, Taras
    Shparyk, Yuriy
    Mylenka, Myroslava
    Kozak-Balaniuk, Iryna
    Powiązania:
    https://bibliotekanauki.pl/articles/2041033.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    spruce forest decline
    tree biomass
    tree number
    species composition
    prediction
    simulation experiment
    gap model
    Opis:
    The aim of this study was to simulate transformation of species composition, biomass and number of treesin spruce stands depending on a possible combination of cutting and planting scenarios as well as climate changes. The FORDRY computer model was used to predict the dynamics of Norway spruce (Picea abies (L.) Karst.) stands in Nadsyansky Regional Landscape Park in the Ukrainian Carpathians. Potential changes in species composition, biomass and number of trees were forecasted for the next 50 years. Four scenarios, first – warm-dry, second – cutting dead spruce trees, third – cutting all trees andfourth – planting, were compared to the control one. The analysis revealed a rapid decrease of stand biomass in the first decade as a result of spruce decline. The model predicts an increase in beech biomass before the 50th year of simulation in all scenarios. In the planting scenario, the biomass of beech increased up to 199.9 ± 6.9 t·ha-1 in the 50th year. Correlation analysis showed weak autocorrelations of spruce and negative cross-correlations of spruce with the total stand in control and other scenarios. The output of performed simulations is supported with field and literature data. Results of this study can be applied in the long-term planning of the management and conservation activities in this region. The application of FORDRY model was found useful for analysing the potential scenarios of spruce stand transformation in Nadsyansky Regional Landscape Park.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2021, 63, 3; 183-194
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implication of forest zonation on tree species composition, diversity and structure in Mabira Forest, Uganda
    Autorzy:
    Weldemariam, E.C.
    Jakisa, E.S.
    Ahebwe, D.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/9997.pdf
    Data publikacji:
    2017
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    forest zonation
    management zone
    tree
    woody species
    plant species
    species composition
    species diversity
    species structure
    Mabira Forest Reserve
    Uganda
    Opis:
    The study aimed to investigate effectiveness of forest management zoning in conserving biodiversity of Mabira forest reserve. The study sites buffer, production, and strict nature reserve management zones were purposively selected. This was undertaken through investigating woody species diversity, composition and structure. A total of 60 sampling plots with a size of 20 m x10 m were used to collect vegetation data. Variables such as woody plant species identification and counts as well as diameter at breast height (DBH) of trees were done. The result depicted a total of 65 woody species; 39 in buffer, 19 in productions and 37 in strict nature reserve. Of these, only 9 trees species were found common to all zones and their Sorensen similarity coefficient was 0.2213. The population structure of the buffer and strict nature reserve zones was found to be a J - shape pattern, whereas the production zone shown an inverted J-shape pattern. Higher woody species diversity was depicted in the buffer and strict nature zones with (H’=2. 73512) and (H’=2. 68412) respectively, and lower in a production zone (H’=1. 63628). The evenness index value of a buffer zone was (J =0. 746574), strict nature (J= 0.743335) and production (J=0. 555719). The production zone had shown higher IVI values followed by buffer and strict nature reserve zone. The most important woody species identified based on their IVI value were Broussonetia papyrifera (Production), Acalypha neptunica (Buffer), Funtumia Elastica (strict nature reserve). The existing forest management is effective in conserving the biodiversity of the forest reserve. Nevertheless, the production zone was still suffering from exploitation of the surrounding community, hence serve for protecting the remaining management zones from further human interference. Further investigation is also required on the adjacent community perceptions of the forest management zoning.
    Źródło:
    Environment, Earth and Ecology; 2017, 1, 1
    2543-9774
    2451-4225
    Pojawia się w:
    Environment, Earth and Ecology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in plant species composition in abandoned and restored limestone grasslands - the effects of tree and shrub cutting
    Autorzy:
    Dzwonko, Z
    Loster, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/57086.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    cutting
    Polska
    grassland
    secondary succession
    restoration
    species diversity
    species composition
    tree
    composition change
    plant species
    shrub
    time series
    botany
    permanent plot
    Opis:
    Abandoned semi-natural limestone grasslands are often overgrown by shrubs and trees. Little is know if and to what extant xerothermic limestone grasslands can be restored by tree cutting. This was tested in a 12-year experiment after the clearing of a 35-year-old secondary pine wood developed on unmanaged grassland in the close proximity of not overgrown old grassland. After 12 years, there were no significant differences in the number of field layer species on the plots in the old and restored grasslands. But over this period the number of meadow species increased in all sites, while the number of xerothermic calcareous species increased significantly only in the old grassland plots. The developing shrub layer negatively influenced the number of nitrophilous and ruderal species in grasslands restored in the former close and open woods, and the number of all species, including the number of non-tufted perennials and perennials with vegetative spread, in the former open wood. The number of meadow species increased in years with higher precipitation in late spring and early summer. The obtained results suggest that in overgrowing grasslands shrubs and trees should be cut every few years, before their covers increase to about 30%. However, this treatment alone will not stop the changes to communities with dominance of tall and vegetatively spreading grasses and forbs. Cutting trees and shrubs in sites where most grassland species have already vanished, without additional managements supporting their dispersal, seedling recruitment and development, is not sufficient to restore limestone grasslands rich in xerothermic species.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2008, 77, 1
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in the structure and floristic composition of the limestone grasslands after cutting trees and shrubs and mowing
    Autorzy:
    Baba, W
    Powiązania:
    https://bibliotekanauki.pl/articles/57458.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    cutting tree
    restoration
    structure
    floristic composition
    limestone grassland
    biodiversity
    change
    tree
    nature conservation
    secondary succession
    species mobility
    shrub
    Opis:
    The calcareous grasslands belong to the species-rich plant communities in Poland. Most of them are of anthropogenic origin and they need specific management (i.e. periodical cutting suckers of trees and shrubs, grazing or mowing) in order to protect their floristic diversity. Many of calcareous grasslands have been overgrown by shrubs as a result of cessation of traditional management. The aim of this study was to compare the structure and dynamics of xerothermic hazel shrub patches, which were undergoing secondary succession with patches where different management practices aiming at restoration of species-rich limestone grassland were applied. The managed plots had a significantly higher species richness than the control one. However, they strongly differed in their floristic composition from well-preserved limestone grasslands. There were also significant differences observed between both the managed plots. Too intensive management, particularly frequent mowing of herbs resulted in expansion of grass species such as Brachypodium pinnatum and Calamagrostis arundinacea and caused a sharp decline in species richness. The species composition and turnover rate strongly depended on succesional stage (soil layer thickness) of plots at the start of the experiment. The deeper was the soil, the higher was the rate of species turnover and the smaller was the share of xerothermic and thermophilous species. The last mentioned group was dominated by species with a persistent seed bank in the soil, frequently colonizing anthropogenic habitats.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2003, 72, 1
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Differences in chemical composition of needle and leaf litter from exotic and native tree species stands
    Autorzy:
    Skorupski, M.
    Jagodzinski, A.M.
    Zytkowiak, R.
    Karolewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/41087.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    chemical composition
    differentiation
    needle
    leaf litter
    exotic plant
    native species
    tree
    plant species
    stand
    nitrogen
    phenolics
    carbohydrate
    carbon
    Opis:
    The potential differentiations in litter chemistry among native and non-native trees are poorly understood. We compared the chemical composition of leaf litterfall of 11 exotic tree species, e.g. coniferous: Abies cephalonica, A. grandis, A. procera, Chamaecyparis pisifera, Pinus peuce, Pseudotsuga menziesii, Thuja plicata, and deciduous: Acer rubrum, A. saccharum, Betula alleghaniensis and Quercus rubra, with that of a native European conifer, Pinus sylvestris (as reference to coniferous species) anda mixture of native European Quercus robur, Carpinus betulus, Tilia cordata, T. platyphyllos and Corylus avellana leaves (as a reference mixture of deciduous species). We found significant differences among the species studied in nitrogen and carbon content in needles/leaves, C/N ratio, as well as total soluble phenolic compounds (TPh) and total nonstructural carbohydrates (TNC) content, including soluble carbohydrates and starch. However, we found no clear differentiation of exotic from native tree species in the analyzed elements and metabolites. Among the exotic coniferous tree species, P. menziesii stood out among the species studied – fallen needles of this species were characterized by relatively high TPh and TNC content. The relationships between TPh and TNC content in leaf and needle litter among tree species were similar among two consecutive years. For deciduous tree species, the tendency of higher TPh content and C/N ratio in leaves falling earlier (September; leaves of sun-type) than later (November; leaves of shade-type) was more distinct than in coniferous tree species. Generally, we cannot see any special differences in the levels or mutual quantitative relationships of the chemical compounds studied in fallen needles/leaves of exotic tree species in comparison with native tree species.
    Źródło:
    Dendrobiology; 2012, 68
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Struktura i dynamika wielogeneracyjnych starodrzewów sosnowych występujących w obszarach ochrony ścisłej Kaliszki i Sieraków w Kampinoskim Parku Narodowym. Część 1. Zróżnicowanie gatunkowe, zagęszczenie i pierśnicowe pole przekroju
    Structure and dynamics of uneven−aged Scots pine−dominated old−growth stands in Kaliszki and Sieraków strict protection areas in the Kampinos National Park. Part 1. Species composition, tree density and basal area
    Autorzy:
    Brzeziecki, B.
    Zajączkowski, J.
    Olszewski, A.
    Bolibok, L.
    Andrzejczyk, T.
    Bielak, K.
    Buraczyk, W.
    Drozdowski, S.
    Gawron, L.
    Jastrzębowski, S.
    Szeligowski, H.
    Żybura, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/978936.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    forest dynamics
    long−term research
    old−growth forest
    permanent study plot
    strict protection
    tree
    species composition
    Opis:
    The paper describes changes, which took place over the last 30 years in old−growth forest stands occupying two permanent research plots, established in the Kaliszki and Sieraków strict protection areas in the Kampinos National Park (central Poland). Both plots have a form of ecological transects. The Kaliszki plot is 20 m wide and 700 m long (1.40 ha), while the Sieraków plot (total area of 2.56 ha) consists of two parts: main (40×460 m) and side (40×180 m) transect. In the Kaliszki plot, the stand measurements were conducted in 1993, 2007, and 2017, while in the Sieraków plot – in 1989, 1994, 2006, and 2017. For every tree with breast height diameter (DBH) 5 cm, species identity, DBH and spatial coordinates were determined. Starting from the second census, all trees which had died (‘losses’), as well as trees which exceeded the DBH threshold (‘gains’) since the previous record were noted, as well. The major tree species occurring on sample plots are Scots pine (Pinus sylvestris), pedunculate oak (Quercus robur), silver and downy birch (Betula sp.), and black alder (Alnus glutinosa). During the study period, the overall tree density declined by ca. 50%. The diminishing trends occurred for all dominant tree species. In contrast to major, dominant tree species, the demographic status of a group of minor tree species (lime, hornbeam and maple) was much more stable. One may even speak about some expansion in this case. Particularly, hornbeam density increased rapidly in the period 2006−2017 in some areas of the main transect located in the Sieraków plot. The future studies will show if this tendency will be maintained and will include other regions of sample plots. Assuming a lack of significant disturbances, one may expect that the stands growing on research plots will rather slowly change in the nearest future. Most dynamics will have a quantitative and not qualitative character. One may anticipate, for example, a growing role of pedunculate oak at the expense of Scots pine, however, considering that the two species are rather long−living, they will probably for a long time keep their dominant roles in the stand canopies.
    Źródło:
    Sylwan; 2020, 164, 05; 392-403
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Roznorodnosc gatunkowa drzew i krzewow oraz ocena prawidlowosci ich doboru na terenie Elektrowni 'Pomorzany'
    Autorzy:
    Lysko, A
    Kiepas-Kokot, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/803476.pdf
    Data publikacji:
    2006
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    zielen miejska
    sklad gatunkowy
    tereny przemyslowe
    Elektrownia Pomorzany
    dobor gatunkow
    drzewa
    krzewy
    urban green
    species composition
    industrial area
    Pomorzany Power Plant
    species selection
    tree
    shrub
    Opis:
    W niniejszej pracy oceniono zróżnicowanie składu gatunkowego drzew i krzewów porastających teren Elektrowni „Pomorzany” w kontekście weryfikacji doboru tych gatunków do lokalnych warunków miejsko-przemysłowych. Stwierdzono występowanie 761 drzew reprezentujących 34 gatunki. Największy udział w strukturze gatunkowej drzew (18%) stanowiły topole (Populus alba, P. nigra, P. canadensis, P. tremula, P. simonii). Krzewy na badanym terenie występują w ilości 1497 egzemplarzy, reprezentujących 27 gatunków. Znaczący udział w strukturze gatunkowej krzewów na tym terenie (19%) odgrywają róże (Rosa sp.). Zieleń zakładową Elektrowni „Pomorzany” należy uznać za urozmaiconą i dobrze skomponowaną, z właściwym doborem gatunków drzew i krzewów. Bieżąca pielęgnacja staje się jednak utrudniona w związku z narastającym zagęszczeniem, szczególnie krzewów, oraz zacienieniem spowodowanym silnym rozwojem koron drzew.
    The diversity of tree and shrub species growing in the area of the „Pomorzany” Power Plant is presented in this paper. The present research also estimates the proper choice of species in accordance to the local, industrial conditions. In the studied area there were 761 trees of 34 different species. The biggest part in the typical structure of trees (18%) was taken by Populus alba, Populus nigra, Populus canadensis, Populus tremula and Populus simonii. In the researched area there were 1497 shrubs of 27 different species. Rosa sp. had a significant quota in a typical structure of shrubs in that area (19%). The research indi-cated that the industrial green in the area of the „Pomorzany” Power Plant was diversified and well composed with a proper selection of trees and shrubs species. However, a present care becomes difficult because of the increasing density especially of shrubs and also because of shadowing caused by a strong evolution of tree crowns.
    Źródło:
    Zeszyty Problemowe Postępów Nauk Rolniczych; 2006, 515; 261-266
    0084-5477
    Pojawia się w:
    Zeszyty Problemowe Postępów Nauk Rolniczych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Potential for genetic conversion of Norway spruce Picea abies (L.) Karst. stands and methods for preserving gene resources of Istebna race in Silesian Beskid Mts
    Autorzy:
    Sabor, J
    Powiązania:
    https://bibliotekanauki.pl/articles/41439.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Silesian Beskids Mountains
    Norway spruce
    forest tree
    Picea abies
    genetic conversion
    genetic value
    silvicultural value
    species composition
    regeneration
    forest site type
    tree stand
    population genetics
    Opis:
    The forests of the Silesian Beskid Mts have a specific composition with a marked dominance of Norway spruce. Although spruce stands are seriously threatened, some of them, such as those of Istebna race, show excellent genetic value. The work stresses the need for the conversion of spruce stands in the Silesian Beskid range on the basis of population genetics and describes the principles of such conversion.
    Źródło:
    Dendrobiology; 2004, 51 Supplement
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania nad zamieraniem jesionu [Fraxinus excelsior L.] w drzewostanach Nadlesnictwa Wloszczowa
    The studies on ash dying [Fraxinus excelsior L.] in the Wloszczowa Forest Unit stands
    Autorzy:
    Kowalski, T
    Lukomska, A
    Powiązania:
    https://bibliotekanauki.pl/articles/28009.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    Nadlesnictwo Wloszczowa
    sklad gatunkowy
    zamieranie wierzcholkow pedow
    drzewa lisciaste
    jesion wyniosly
    plamistosc pedow
    objawy chorobowe
    zamieranie lisci
    czynniki chorobotworcze
    drzewostany
    atrofia
    Fraxinus excelsior
    przebarwienia lisci
    zamieranie drzew
    zamieranie pedow
    identyfikacja
    grzyby chorobotworcze
    Wloszczowa Forest Inspectorate
    species composition
    shoot apex
    plant decline
    deciduous tree
    European ash
    plant disease
    shoot
    pathogenic symptom
    leaf decline
    pathogenic factor
    tree stand
    atrophy
    leaf discolouration
    tree decline
    shoot decline
    identification
    pathogenic fungi
    Opis:
    The studies were carried out in the Włoszczowa Forest Unit, in 9 ash stands differing in respect of age, origin (natural, artificial), site and in the nursery on 3 quarters differing due to a silvicultural method (transplanted and not transplanted) and seedlings age. In each stand an analysis of disease symptoms was carried out on 100 trees (2 - 20 years old stands) or 50 trees (21 - 80 years old stands) growing side by side in central part of the stand, while in the nursery in each block 200 seedlings were analyzed (4 sectors with 50 seedlings each). From the infected seedlings and trees 120 fragments of dead branches, living branches with cankers, and dead roots were taken. Identification of fungi was made on the basis of fructification and over 300 isolations of fungi on malt agar medium. The most frequent disease symptoms in ash stands were: the dead top (34.7% trees), the dying of whole branches (83.5%), the dying of the top of branches (20.1%), the occurrence of healed (36.0%) and unhealed cankers (18.9%) and the slime flux (23.7%) on the trunk, also the chlorosis of leaves (7.5%) and their atrophy (11.2%). Most of the types of disease symptoms appeared irrespectively of the tree age, origin and site, sometimes showing only a difference in the frequency of occurrence. On the seedlings in the nursery the shoot discolouration, healed and unhealed cankers on shoots and necrosis of a part of leaves were recorded most frequently. Disease symptoms occurred more frequently on 4-year-old seedlings in comparison with 3-year-old. In respect of transplanted seedlings the leaves dying was more frequent. Within cankers and on dead tops of shoots the most frequent were: Alternaria alternata, Chalara sp., Cytospora ambiens, Diplodia mutila, Fusarium lateritium, Gloeosporidiella turgida, Phomopsis controversa and Phomopsis scobina. In sparsely found dead roots of living trees appeared mostly: Cryptosporiopsis radicicola, Cylindrocarpon destructans and Phialocephala sp.
    Badania prowadzono w Nadl. Włoszczowa w 9 drzewostanach jesionowych różniących się wiekiem, pochodzeniem (naturalne, sztuczne) i siedliskiem oraz w szkółce leśnej na 3 kwaterach różniących się sposobem hodowli (sadzonki szkółkowane, nie szkółkowane) i wiekiem sadzonek. W każdym drzewostanie dokonano analizy symptomów chorobowych u 100 (2 do 20-letnie drzewostany) lub 50 drzew (21 do 80-letnie drzewostany) rosnących obok siebie w części środkowej drzewostanu, zaś w szkółce leśnej na każdej kwaterze zbadano 200 sadzonek (4 sektory po 50 sadzonek). Z chorych sadzonek i drzew pobrano 120 fragmentów zamarłych gałęzi, żywych gałęzi z nekrozami oraz zamarłych korzeni. Identyfikacji grzybów dokonano na podstawie owocników oraz ponad 300 izolacji na pożywkę agarowo-maltozową. Do najczęstszych objawów chorobowych w drzewostanach jesionowych należały: zamieranie wierzchołków (34,7% drzew), zamieranie całych gałęzi (83,5%), zamieranie szczytów gałęzi (20,1%), obecność na pniu zabliźnionych (36,0%) i nie zabliźnionych nekroz (18,9%) oraz wycieków brunatnej substancji (23,7%), a także przebarwienie liści (7,5%) i ich atrofia (11,2%). Większość rodzajów objawów chorobowych występowała niezależnie od wieku drzew, pochodzenia i siedliska, wykazując jedynie niekiedy różnice w częstości występowania. Na sadzonkach w szkółce najczęściej stwierdzano plamistości na pędach, nekrozy zabliźnione i nie zabliźnione na pędach oraz nekrozę części liści. Objawy chorobowe częściej występowały u sadzonek 4-letnich w porównaniu z 3-letnimi. U sadzonek szkółkowanych częściej dochodziło do obumierania liści. W obrębie nekroz i na obumarłych szczytach pędów najczęściej stwierdzano grzyby: Alternaria alternatei, Chalara sp., Cytospora ambiens, Diplodia mutila, Fusarium lateritium, Gloeosporidiella turgida, Phomopsis controversa i Phomopsis scobina. W nielicznie stwierdzanych obumarłych korzeniach żywych drzew występowały głównie: Cryptosporiopsis radicicola, Cylindrocarpon destructans i Phialocephala sp.
    Źródło:
    Acta Agrobotanica; 2005, 58, 2; 429-439
    0065-0951
    2300-357X
    Pojawia się w:
    Acta Agrobotanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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