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    Wyświetlanie 1-5 z 5
    Tytuł:
    Effect of the coniferous forest - grassland edge on ground vegetation in the mixed European forest zone, Lithuania
    Autorzy:
    Marozas, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/41375.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    coniferous forest
    grassland
    forest edge
    ground vegetation
    mixed forest
    species richness
    forest fragmentation
    Europe
    Lithuania
    Opis:
    The objective of this study was to estimate the edge effect on the species richness in agriculturally maintained forest-grassland boundaries of coniferous forest and to determine how species respond to a forest edge. We hypothesised that species number, cover of herbs and mosses is higher in the edge, and species penetrates from nearby grasslands into forest interior. The study was conducted in the Southwestern Lithuania. The edge effect on overall herbaceous species composition of coniferous forests was evaluated by Canonical Correspondence Analysis. The species richness of herbs and mosses in the coniferous forest was highest in the forest edge and declined towards interior. The highest decrease in the number of species occurred within 0 to 5 m to the edge. The highest cover of herbs and mosses was in the forest edge and decreased towards the forest interior. CCA biplot showed a good correlation of overall species composition and the distance to the forest edge. Distribution of species along edge to interior gradient depended on the species response to different ecological factors. Ellenberg value of light was higher in the edge. Ellenberg value of nitrogen was higher in the forest interior.
    Źródło:
    Dendrobiology; 2014, 71
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tree species diversity and above-ground biomass of natural temperate forest: montane versus lowland forest
    Autorzy:
    Gazda, A.
    Miscicki, S.
    Chwistek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/41218.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    tree
    plant species
    species diversity
    aboveground biomass
    temperate forest
    mountain forest
    lowland forest
    species richness
    Opis:
    We studied the relationship between tree-species diversity and the above-ground biomass on an example of two natural Polish forest with different altitiudinal range, plant species pool, vegetation and climatic conditions. The study sought to determine whether: (1) above-ground biomass in natural forests correlates with tree-species diversity irrespective of the kind of forest (montane or lowland), and (2) the relationship in question is negative, (3) the above-ground biomass is greater in montane forests than in lowland ones. Natural forests present in 1º Polish Gorce Mountains (montane forest) alongside comparable data for the 2º world-renowned lowland forest that is present in the Białowieża National Park. Data were collected within 558 sample plots (á 200-square-metre). The diameter at breast height of all trees with girths of or exceeding 12 cm was measured. To compute above-ground biomass we calculated dry masses for each tree on the basis of values for dbh and height, next we summed these values for all species present within each plot. The number of tree species on a plot ranged from only one (mainly in spruce stands) to six (in mixed deciduous lowland forest stands). The above-ground accumulated biomass ranged from 6 to 1155 (average 251±13) t ha–1 within the lowland forest, and from 2 to 849 (average 242±8) t ha–1 within the montane forest. We concluded that there was a humped-back shaped relationship between tree-species diversity and above-ground biomass in both lowland and montane natural forests.
    Źródło:
    Dendrobiology; 2015, 73
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radial variations in wood density and their implications for above-ground biomass estimations, in a tropical high-andean forest
    Autorzy:
    González-Melo, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078271.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    wood density
    above-ground biomass
    radial variations
    tropical high-Andean trees
    Opis:
    Wood density (WD) is a central trait to explain tree functioning, and is also an important predic- tor of tree above-ground biomass (AGB). Therefore, radial trends in WD (i.e., from pith to bark) may have important implications in understanding tree life-history variations, as well as in forest biomass and carbon estimations. The occurrence of these radial trends in WD is thought to vary among forests, particularly with canopy openness and stratification. Yet, most of the studies on this topic in tropical forests have been conducted on lowland closed-canopy forests, while very little is known about the prevalence and magnitude of these trends among trees from open-canopy forests, such as high-mountain forests. I examined radial gradients in WD and explored their implications for AGB estimations. Radial wood cores were taken with increment borers from 69 trees belonging to 18 species from a high-An- dean forest. Each wood core was cut every 1-cm, and WD was measured for every 1-cm segment. Errors in AGB estimations that resulted from not considering radial trends in WD were estimated for each tree and species. Eight out of eighteen species had significant radial trends in WD. Among these species, two species showed decreases of WD towards the bark, one species showed increments of WD from pith to bark, and five species showed U-shaped gradients (i.e., high WD near the pith and bark, and relatively low WD at inter- mediate diameters). The prevalence of U-shaped radial trends in WD may be related to the relatively open and less stratified canopy of the study forest. Not taking into account radial trends in WD led in general to under-estimations of AGB (averaging −7.66 % when using mean WD, and −5.56 % for outer WD) in most of the study species, suggesting that tropical high-Andean forests may possibly store more biomass carbon than has been previously estimated. These findings are important to expand our knowledge on wood allocation patterns during tree ontogeny, and also to improve the accuracy of biomass and carbon estimations in tropical high-Andean forests
    Źródło:
    Dendrobiology; 2021, 86; 19-28
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Long term observation of mycorrhizal status and above-ground fungi fruiting body production in oak forest
    Autorzy:
    Peskova, V.
    Landa, J.
    Modlinger, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/41294.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Opis:
    The complex study in oak forest (Dřevíc; Czech Republic) provided unique long-term data concerning the mycorrhizal activity, fungi fructification and health status of trees in relation to elementary environmental factors. When comparing spring and autumnal root sampling, the statistically significant difference in the nonactive mycorrhizae and dry root mass of 1 mm or less occurred. The annual monitored values of fungi fructification and their differences are dependent on summer and autumn precipitation. The total annual precipitation is not of great importance. The significant connection between defoliation and increased relative quantity of nonactive mycorrhizae and, on the contrary, reduction of the active mycorrhizae density was documented in the overall evaluation. Spring and autumn root samples provided statistically significant difference in the nonactive mycorrhizae and dry root mass of roots below 1 mm in diameter. Long-term surveys are important for understanding the structure of mushroom assemblages and their biodiversity. The significant variation of the annual monitored values of fungi fructification is mostly dependent on precipitation intensity during summer and autumn and not on the total annual precipitation. No significant relation between the mycorrhizal activity and fructification of macromycetes was found in the sense of actual maximum-minimum abundance in time. The significant variation occurs in annual values of fungi fructification, number of species and mycorrhizal distribution, what is influenced by many factors. As a most significant and influencing of these factors is the course of precipitation. The year-on-year and also spring and autumnal differences between the mycorrhizal activity which was not in correlation in time with fungi fructification, were ascertained. Since this discovery significantly predicates the status of the monitored mycorrhizal stand, we consider their actual monitoringas highly opportune and mutually completing the final general view.
    Źródło:
    Dendrobiology; 2013, 69
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Osmotic adaptation of Quercus robur L. under water stress in stands with different tree density - relation with groundwater table
    Autorzy:
    Cater, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/41074.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    osmotic adaptation
    osmotic water potential
    pedunculate oak
    flood plain forest
    Quercus robur
    water stress
    stand
    tree
    plant density
    density
    relation
    ground water
    Opis:
    Solute accumulation in plant leaves during drought through accumulation of organic compounds is known to compensate turgor loss andpromote higher stomatal conductance at lower water potentials. Recent studies have involved experiments on saplings and younger stands, while evidence of osmotic adjustment in adult pedunculate oak under natural stand conditions on different sites is scarce. Pressure volume curves technique was used to define differences in osmotic potential – water stress adaptation – of 120 year oldped unculate oak trees in two managedforest complexes andin virgin forest remnant. Tree response between the managedstandafter thinning andthe standwithout any silvicultural measures within same forest complex was also compared during summer months in two consecutive (dry and favourable) years with groundwater table. Significant differences were observed in adaptation between forest complexes and during dry (2003) and favourable (2004) years. Osmotic component of thinnedforest was the highest, showing most negative values of stress adjustment. Measured values on all plots responded well to drop in groundwater table, especially in pronounced drought conditions. Such response may be in relation with lower stand density and increased individual space for growth in thinned stand. Adult oaks did not loose their ability to water stress adaptation, in spite of their age and progressively decreasing health conditions.
    Źródło:
    Dendrobiology; 2011, 65
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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