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Wyszukujesz frazę "forest species" wg kryterium: Temat


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:
The spread of Impatiens parviflora DC. in Central European oak forests - another stage of invasion?
Autorzy:
Reczynska, K.
Swierkosz, K.
Dajdok, Z.
Powiązania:
https://bibliotekanauki.pl/articles/56626.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
Impatiens parviflora
spread
Central Europe
oak forest
invasive plant
long-term change
plant species
species composition
forest vegetation
small balsam
Opis:
In this study, we examine the pattern of occurrence of Impatiens parviflora in Central European oak forests over time and its ecological requirements within these types of communities. Research was based on phytosociological data collected in 3776 relevés. A modified TWINSPAN algorithm were used to distinguish the groups of oak forests. The ecological preferences of the I. parviflora and studied communities as well as differences between invaded and non-invaded vegetation plots were analyzed using mean weighted Ellenberg indicator values (EIVs). Finally, both the temporal pattern of I. parviflora participation and changes in its coverage in the studied communities were analyzed. Our study confirmed a high adaptability of this species with respect to temperature, moisture, soil reaction and nutrients and determined its broad ecological optimum in oak forests. However, it also revealed both a greater sensitivity of some communities within Central European oak forests to the invasion of I. parviflora and differences in habitat conditions between invaded and non-invaded vegetation plots. This suggests that the habitat niche of I. parviflora within oak forests is not accidental. The analysis of temporal changes in the frequency of I. parviflora confirmed a 20% increase in relevés over the last 50 years. However, we did not identify any statistically significant rise in the coverage of I. parviflora in oak forests specifically during the studied period.
Źródło:
Acta Societatis Botanicorum Poloniae; 2015, 84, 4
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany składu gatunkowego i struktury drzewostanów w Roztoczańskim Parku Narodowym w okresie 2007-2017
Changes in the species composition and structure of forest stands in the Roztocze National Park in the years 2007-2017
Autorzy:
Łukaszewicz, J.
Zajączkowski, G.
Gil, W.
Tittenbrun, A.
Radliński, B.
Powiązania:
https://bibliotekanauki.pl/articles/979113.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
forest dynamics
species composition
dbh distribution
permanent plot
strict protection
Opis:
The aim of the study is to analyze changes in the species composition and in the diameter structure of the main forest−building species in the Roztocze National Park (central−eastern Poland). The research was carried out on 315 permanent monitoring plots. The range of collected data included: type of protection (strict and active protection), forest site type, tree species and their dbh (>7 cm over bark). Measurements and observations were made in 2007 and repeated in 2017. There was a significant reduction in the number of all tree species, except of beech Fagus sylvatica, regardless the protection status. Despite this, the basal area for the strict and active protection zone was similar both in 2007 (37.77 and 36.39 m2/ha, respectively) and 2017 (37.17 and 37.85 m2/ha, respectively). In the whole park, the number of large trees (mainly beeches) with high individual basal area increased, while the number of young generations of all species decreased. In the strict protection zone, the admixture species (decrease by 27.3%), as well as hornbeam Carpinus betulus (decrease by 22.8%), are not particularly competitive with beech. A similar tendency, although mitigated by active silvicultural treatments, was also observed in the active protection zone, in which admixture species have lost 24.8% while hornbeam 16.2%. In the strict protection area, there was a significant reduction in the number of fir Abies alba (by 14%). In the active protection zone fir increased its range and basal area, and maintains its population practically unchanged. There was also a decrease in the number of young generations, as evidenced by changes in the frequency in the 7−16 cm dbh class. The highest level of reduction in this class was found for pine Pinus sylvestris (by 64.8%), rare species (40.4%), hornbeam (31.2%), oak Quercus robur (26.6%), and spruce Picea abies (20.5%). Only beech increased the abundance in this class (by 1.4%) as well as in the next 17−26 cm class (even by 14.2%). The presented significant changes in the species composition and structure of basal area of the stands in the Roztocze National Park that occurred in the 10−year period, indicate a significant role of tending cuts in maintaining proper species composition, appropriate diameter structure of stands, their stability of natural richness and high level of diversity of forest ecosystems.
Źródło:
Sylwan; 2020, 164, 08; 683-694
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in species composition of desmids in the 'Bloto' peat bog [the Niepolomice Forest] from 1954 to 2001
Autorzy:
Wayda, M
Powiązania:
https://bibliotekanauki.pl/articles/57323.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
species composition
change
botany
Niepolomice Forest
Chlorophyta
desmid
peat bog
Opis:
After the lapse of 48 years, a renewed study on species composition of desmids was carried out at the Błoto peat bog in the Niepołomice Forest. During this period, the peat bog underwent far-reaching changes caused by man. Out of 41 species recorded by Wasylik (1955), the occurrence of only 11 was confirmed. However, 14 species absent at the time of the earlier study were found. In all, 25 species of desmids were found. The present state of the desmid flora was brought about by increase of pH, draining of the area, disappearance of peat mosses and probably by eutrophication of waters in the studied area.
Źródło:
Acta Societatis Botanicorum Poloniae; 2004, 73, 3
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
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:
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:
Species diversity and composition of fungal communities in a Scots pine forest affected by the great cormorant colony
Autorzy:
Kutorga, E.
Irsenaite, R.
Iznova, T.
Kasparavicius, J.
Markovskaja, S.
Motiejunaite, J.
Powiązania:
https://bibliotekanauki.pl/articles/67238.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
species diversity
species composition
fungi community
checklist
Scotch pine
Pinus sylvestris
pine forest
Great Cormorant
Phalacrocorax carbo
animal colony
Opis:
A Scots pine forest, affected by the great cormorant colony, was studied by plot-based fungal survey method during the years 2010-2012 in Lithuania. Diversity and composition of fungal communities were investigated at five zones that had been influenced by different stages of breeding colony establishment: starting-point and almost abandoned cormorant colony part (zones A and B), active part (zones C and D), and the edge of the colony (zone E). The control zone G in undamaged by cormorants pine stand was assessed too. A total of 257 fungal species of ascomycetes including anamorphic fungi, basidiomycetes and zygomycetes were recorded. Seven species were registered for the first time in Lithuania. Species richness in the examined zones varied, lowest being in zones B (51 species), C (46) and D (73) and almost twice as high in the zones A and E (129 and 120, respectively). The comparison of fungal species compositions of different zones showed that their similarity was rather low (SS: 0.22–0.59). The most obvious changes in the trophic structure of fungal communities in the territory occupied by the bird colony were a strong decrease of mycorrhizal species, the presence of coprophilous fungi on forest litter, and the appearance of host-specialized fungi on alien and non-forest plants that have established in the disturbed forest.
Źródło:
Acta Mycologica; 2013, 48, 2
0001-625X
2353-074X
Pojawia się w:
Acta Mycologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Species diversity and litter dynamics in secondary mixed deciduous forest, Thung Salaeng Lung National Park, Northern, Thailand
Autorzy:
Podong, C.
Poolsiri, R.
Katzensteiner, K.
Pengthamkeerati, P.
Thongdeenok, P.
Powiązania:
https://bibliotekanauki.pl/articles/38576.pdf
Data publikacji:
2013
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
species diversity
species composition
carbon
nitrogen
litter dynamics
secondary mixed deciduous forest
shifting cultivation
Thung Salaeng Lung National Park
Thailand
Opis:
This study present species composition and potential of litter on carbon and nitrogen return in secondary mixed deciduous forest after shifting cultivation. The dominant species of trees were Haldina cordifolia, Albizia odoratissima and Lagerstroemia duperreana. The Important Value Index (IVI) values of trees were 132.91, 17.78 and 14.22, respectively. The pattern for the decomposition coefficients (k) was highest in the wet period (May–September) and lowest in the dry period (October–April). The carbon and nitrogen return patterns increased in the dry period (October– April) and decreased in the wet period (May–September). Carbon and nitrogen loss in the decomposing litter continually decreased during the decomposition process from the initial levels, with a final relatively rapid release in the wet period. Results from this study was understanding of community composition, litterfall production and litter decomposition for understanding potential of secondary mixed deciduous forest for balancing carbon for mitigating greenhouse gas effect in the local area.
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2013, 55, 4
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phytosociological structure of Cladonio-Pinetum Juraszek 1927 of the Western Polissya of Ukraine
Fitosocjologiczna struktura borów chrobotkowych Cladonio-Pinetum Juraszek 1927 z Polesia na terenie zachodniej Ukrainy
Autorzy:
Mertsalo, M.
Soroka, M.
Powiązania:
https://bibliotekanauki.pl/articles/791412.pdf
Data publikacji:
2017
Wydawca:
Wyższa Szkoła Zarządzania Środowiskiem w Tucholi
Tematy:
phytosociological structure
Cladonio-Pinetum habitat
lichen
moss
species composition
pine forest
Scotch pine
Ukraine
Źródło:
Zarządzanie Ochroną Przyrody w Lasach; 2017, 11
2081-1438
2391-4106
Pojawia się w:
Zarządzanie Ochroną Przyrody w Lasach
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:
Structure and dynamics of selected stands of primeval character in the Pieniny National Park
Autorzy:
Jaworski, A
Podlaski, R.
Powiązania:
https://bibliotekanauki.pl/articles/41477.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Pieniny National Park
forest
species composition
structure
stand
development stage
fir
Abies alba
beech
Fagus sylvatica
plant regression
Opis:
The purpose of this study was to determine changes which occurred during 23 years (1974–1997) in four stands in respect of species composition, structure, developmental stages and phases. In 1997 the Walusiowka stand represented the growing up stage, phase of a multistory structure, and during the study period its volume decreased from 698 to 676 m3/ha.The Przełęcz Sosnow stand was in the growing up stage, phase of a little diversified storied structure and regeneration, and its volume decreased from 696 to 622 m3/ha.The Grodek stand during the entire study period was in the growing up stage, phase of the selection forest structure and regeneration, and its volume increased from 529 to 585 m3/ha.The Facimiech stand in 1997 was in the optimum stage, phase of aging and regeneration, and its volume decreased from 688 to 661 m3/ha.During 1974–1997 the percentage of fir (Abies alba) considerably decreased in three stands (Walusiowka from 46 to 33%, Przełęcz Sosnow from 58 to 36%, Grodek from 42 to 24%).The Facimiech stand was almost a pure fir stand during the entire control period. In the Przełęcz Sosnow stand, due to a rapid mortality of fir and presence of vital trees of beech (Fagus sylvatica) of the growing up and optimum growth generations, the break up stage did not take place but the growing up stage had developed, which indicated the disturbance of the natural cycle of the primeval forest described by Korpel’. A scarce presence of fir upgrowth and prevalence of beech in stands composed of these two species permits to suppose that fir will be retreating in favor of beech.
Źródło:
Dendrobiology; 2007, 58; 25-41
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ oddziaływań brzegowych na roślinność polan leśnych w Sudetach Środkowych
Influence of the edge effect on the vegetation of forest glades in the Middle Sudety Mts. (SW Poland)
Autorzy:
Pruchniewicz, D.
Żołnierz, L.
Powiązania:
https://bibliotekanauki.pl/articles/989965.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
gory
Sudety Srodkowe
Gory Sowie
Gory Bardzkie
Wzgorza Wlodzickie
Wzgorza Wyrebinskie
polany srodlesne
oddzialywania brzegowe
roslinnosc lakowa
sklad gatunkowy
roznorodnosc gatunkowa
forest glades
edge effect
species composition
functional groups
species diversity
Opis:
The influence of the edge effect on the meadow vegetation pattern was studied in the forest glades in the central part of the Middle Sudety Mts. (SW Poland). The spectacular edge effect is seen in the range of 4 m from the forest border towards the center of the glades. Within that belt we observed decrease in tree and bush species number, increase in share of graminoids and Fabaceae species, as well as increase in share of species generally related to grassland communities. A significant increase in species number and values of Shannon−Wiener diversity index was noticed within the distance of eight meters from the edges of glades.
Źródło:
Sylwan; 2014, 158, 07; 524-530
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Syntaxonomy and ecology of forest vegetation in the Stiavnicke vrchy Mts (Central Slovakia)
Autorzy:
Slezak, M.
Hegedusova, K.
Senko, D.
Powiązania:
https://bibliotekanauki.pl/articles/56428.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
syntaxonomy
ecology
forest vegetation
Stiavnicke Vrchy Mountains
Central Slovakia
Slovakia
classification
Quercetea roboli-petraeae class
Querco-Fagetea class
numerical method
Ellenberg indicator value
vegetation survey
Western Carpathians Mountains
plant distribution
species composition
forest ecosystem
Opis:
Vegetation of deciduous forests in the Štiavnické vrchy Mts (Central Slovakia) was studied using the standard Zürich-Montpellier approach. The numerical classification and ordination technique were applied to determine the main forest vegetation types and to find the responsible environmental drivers related to their distribution patterns, respectively. The data set including 198 relevés collected by authors in 1997-2009 and 185 relevés excerpted from literature was used to analysis. Numerical classification resulted in delimitation of fourteen vegetation types representing eleven associations with two variants and two communities within the Quercetea roboripetraeae and Querco-Fagetea classes. The major environmental gradients in variation of forest species composition were associated with moisture and nutrient content following the average Ellenberg indicator values. Along the moisture gradient, vegetation types were ordered from subxerophilous oak forests turn mesophilous mixed oak-hornbeam, beech and ravine forests to hygrophilous riparian alder forest. The results confirmed important role of soil nutrients and moisture by determination of forest vegetation in subcontinental part of Central Europe. Special attention was given to the discussion of floristical characteristics, site conditions and syntaxonomy.
Źródło:
Acta Societatis Botanicorum Poloniae; 2011, 80, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effects of different types of woodstand disturbance on the persistence of soil seed banks
Autorzy:
Kwiatkowska-Falinska, A.
Panufnik-Medrzycka, D.
Wodkiewicz, M.
Sondej, I.
Jaroszewicz, B.
Powiązania:
https://bibliotekanauki.pl/articles/59064.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
different type
woodstand
soil
seed bank
density
disturbance
frequency
longevity index
persistence
soil seed bank
Bialowieza Forest
Potentillo albae-Quercetum community
species composition
Opis:
The research was conducted on four patches of thermophilous oak wood in Białowieża Primeval Forest: A – with a woodstand: oak + approx. 30-year-old hornbeam + hornbeam brushwood; B – with a hornbeam stand formed by natural seed fall after logging (ca. 1920) oaks; C – after logging oaks and replanted (ca. 1965) with pine and oak; D – with a natural low-density oak stand. Species composition and seed bank density were estimated using the seedling emergence method. Seedling emergence was observed over two vegetation seasons. Research demonstrated that: 1) the species abundance of the seed banks depends on canopy cover (A, B approx. 50 species; C, D approx. 70 species); 2) the floristical similarity (Sørensen’s index) of the seed bank and ground vegetation is higher in the undisturbed patch D (0.50) than in disturbed patches (0.30-0.35); 3) species diversity in plots A, B, C, D (H’=12.5; 13.4; 15.5; 16.9) and seed bank density per m2 (432.5; 958.0; 1486.5; 2268.0) are negatively correlated with the degree of patch shading; 4) the average weight of diaspores in the seed banks of shady plots is lower (A, B approx. 0.003 g) than that of sunny plots (C, D approx. 0.08 g); 5) the share of long-lived diaspores increases in patches after logging.
Źródło:
Acta Societatis Botanicorum Poloniae; 2011, 80, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of environmental conditions on surface water quality in the Zimnik and Czyrna catchments of the Beskid Śląski
Wpływ warunków środowiskowych na jakość wód powierzchniowych w zlewni Zimnika i Czyrnej w Beskidzie Śląskim
Autorzy:
Małek, S.
Krakowian, K.
Powiązania:
https://bibliotekanauki.pl/articles/292743.pdf
Data publikacji:
2009
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
Beskid Śląski
budowa geologiczna
jakość wód
skład gatunkowy
typ siedliskowy lasu
wody powierzchniowe
Beskid Śląski Mts.
forest type
geology
species composition
surface water
water quality
Opis:
The study was carried out in the year 2004 in the Zimnik and Czyrna catchments situated on opposite slopes of Skrzyczne in the Beskid Śląski Mts. Water samples collected from streams during three sampling sessions were analysed. The first session was carried out during snowmelt (April/May), the second during intensive rainfall in the vegetation season (June) and the third - during low water level (October). A data set consisting of conductivity, water pH, concentrations of major anions (Cl-, NO3-, SO42-) and cations (NH4+, Na+, K+, Ca2+, Mg2+) was produced and waters were then classified according to Polish standards (years 2002 and 2004). Chemical composition of stream waters depended on physical and geological properties of drainage areas and on seasonal changes of water level in the catchment. Water class depended also on precipitation and on forest type. It was found that water from most sampling points in streams was unfit for drinking - 66 out of collected 89 samples were beyond the first A1 category and the main reason for that was too low pH and high concentrations of NH4+ and NO3-. During intensive rainfall in the vegetation season higher washing out of cations was observed from beech and multispecies forest stands than from spruce stands, which partly neutralized water pH and in consequence improved water quality. This phenomenon should be considered while afforesting streams neighborhoods where water is or will be used as a source of drinking water.
Badania zostały przeprowadzone w 2004 roku w zlewniach Zimnika i Czyrnej leżących na przeciwległych stokach Skrzycznego w Beskidzie Śląskim. Analizie poddano wody pobrane z potoków podczas trzech sesji pomiarowych. Pierwsza odbyła się podczas roztopów śniegu (kwiecień/maj), druga sesja w trakcie intensywnych opadów deszczu w okresie wegetacji (czerwiec), trzecia przy niskim stanie wód (październik). Analizowano odczyn i przewodność elektrolityczną, oraz stężenie anionów (Cl-, NO3-, SO42-) i kationów (NH4+, Na+, K+, Ca2+, Mg2+). Wyniki poddano klasyfikacji wód pitnych wg polskich norm (z 2002 i 2004 r.). Skład chemiczny wód powierzchniowych zależy od fizycznych i geologicznych właściwości utworów budujących zlewnie. Przynależność wód do klasy zależy również od wystąpienia i rodzaju opadów atmosferycznych oraz składu gatunkowego. Stwierdzono niezdatność dużej części badanych wód do picia - 66 z 89 pobranych prób znajdowało się poza klasa A1, głównie ze względu na niski ich odczyn oraz wysokie stężenie NH4+ i NO3-. W drzewostanach bukowych i wielogatunkowych zaobserwowano znacząco większe niż w świerkowych wymywanie kationów podczas intensywnych opadów deszczu, co w pewnym stopniu neutralizowało odczyn wód a tym samym podnosiło jakość wód. Ten fakt powinien być brany pod uwagę przy zalesianiu terenów źródliskowych i sąsiadujących z potokami w obszarach, gdzie wody te wykorzystywane są lub będą w przyszłości, jako dodatkowe ujęcia wód pitnych.
Źródło:
Journal of Water and Land Development; 2009, no. 13a; 205-223
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł

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