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    Wyświetlanie 1-5 z 5
    Tytuł:
    Contrasting foliar and soil nutrients responses to drought induced crown dieback in a Quercus brantii forest
    Autorzy:
    Hosseini, A.
    Hosseini, S.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2130168.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    crown condition
    drought
    nutrients
    persian oak forests
    tree decline
    Opis:
    Evidence has shown that drought-induced crown dieback has significant interaction with soil-plant water and nutrients relationships, but there isn’t sufficient knowledge of the water and nutrients connections in declining Persian oak (Quercus brantii) trees. To investigate the relationships between crown dieback and leaf nutrients concentrations, leaf water content, soil nutrients concentrations and soil moisture, one of the dieback affected stands was selected. This stand was located in Shalam forested area in northern Ilam province, west of Iran. Persian oak trees were evaluated using a crown dieback classification and divided into four classes with four replicates based on the severity of crown dieback. Sampling from leaves of trees and soil was implemented randomly in four sides of tree crown in August. Trees with moderate to severe declining showed reduced leaf water content (WC) and reduced relative leaf water content (RWC). Leaf N and P concentration of declining trees was significantly (p-value <0.05) more than that of healthy trees. The leaf K concentration of declining trees was significantly (p-value <0.10) more than that of the healthy. The leaf N:P amounts of oak trees was statistically different among crown dieback classes. But no significant differences was observed between the healthy and declining trees in terms of soil N, P, K, Ca and Mg concentrations and soil moisture. It was concluded that drought has effects on the nutrients status in the leaves of Persian oak trees and their changing in the declining trees is for resistance to drought condition, improving water use efficiency and possibly performance of vital activities.
    Źródło:
    Dendrobiology; 2022, 87; 101-112
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Climatic sensitivity of Quercus robur L. in floodplain near Kyiv under river regulation
    Autorzy:
    Netsvetov, Maksym
    Prokopuk, Yulia
    Didukh, Yakiv
    Romenskyy, Maksym
    Powiązania:
    https://bibliotekanauki.pl/articles/956963.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    pedunculate oak
    tree-ring width
    riparian forest
    dendroclimatology
    moving correlation
    Opis:
    Climate change has a significant impact on natural ecosystems, particularly on floodplain forests that are among the most transformed ecosystems in the world. The climate sensitivity of dominant species is likely to play a key role in determining the susceptibility of flooded forests to climate changes. Here, we use dendrochronological approaches and local climate records from 1880 to 2015 to assess the response in pedunculate oak (Quercus robur L.) trees growing in a floodplain of the Dnipro River near Kyiv to climatic variables. Correlation analysis reveals the strongest positive association of the Q. robur tree-ring width chronology with May–June precipitation, May–June temperature, and May self-calibrating Palmers drought severity indices (scPDSI). The moving-window correlation analysis points to positive association with the scPDSI after the 1950s, when local river regulation was implemented. The positive correlation with current March precipitation is the least expected change in the oak growth-to-climate relationship that occurred in the aftermath of human alterations in the local river and regional climate changes. This study discusses the probable ecological consequences and ecophysiological mechanisms of observable climate-to-growth relationships and their temporal stability.
    Źródło:
    Dendrobiology; 2018, 79; 20-33
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oak (Quercus spp.) response to climate differs more among sites than among species in central Czech Republic
    Autorzy:
    Rybnicek, M.
    Cermak, P.
    Prokop, O.
    Zid, T.
    Trnka, M.
    Kolar, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/41078.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    oak
    Quercus
    plant response
    climatic parameter
    precipitation
    temperature
    tree ring
    Czech Republic
    Opis:
    Climatic parameters are the main environmental factors affecting tree growth. The main aim of the presented study was to determine whether different oak species growing under contrasting environmental conditions show different sensitivity to climatic parameters. Four oak stands with Quercus robur, Quercus petraea, Quercus polycarpa and Quercus dalechampii growing in the same area were evaluated. Standard dendrochronological methods were used for sample preparation, ring width measurements, cross-dating, chronology development, and the assessment of growth-climate response patterns. Although the species grew under different environmental conditions, their local tree-ring chronologies are highly correlated. The radial growth responses to climatic parameters differ slightly, but the response depends more on local site conditions than on the oak species. At the same time, the strongest correlations between radial growth and climatic parameters were identical among species and sites. The amount of water available in the soil was the main climate-dependent factor limiting radial growth. Approximately since the 1990s, the distribution of rainfalls within the growing season has changed at the expense of spring precipitation. The significance of relative soil moisture content during spring for oak growth increased and the significance of summer values decreased.
    Źródło:
    Dendrobiology; 2016, 75
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of the relationship between the SPAD values and photosynthetic pigments content in Quercus petraea and Prunus serotina leaves
    Autorzy:
    Bielinis, E.
    Jozwiak, W.
    Robakowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/41313.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    black cherry
    tree
    modelling
    relationship
    SPAD value
    photosynthetic pigment
    pigment content
    Quercus petraea
    Prunus serotina
    leaf
    sessile oak
    chlorophyll
    carotenoid
    Opis:
    In forest research and nursery practice there is often a need to monitor the condition and responses of trees to different stressors. Chlorophyll content in leaf is a good indicator of plant health and can be measured rapidly in many repetitions using the chlorophyll meter SPAD-502Plus. This practical tool provides the values of chlorophyll content in relative units (SPAD values), therefore it should be calibrated for each species to determine chlorophyll content in physiological units. In this study, the chlorophyll meter SPAD-502Plus was calibrated to be used for total chlorophyll (Chl), chlorophyll a (Chl a), chlorophyll b (Chl b) and carotenoids (Car) contents determination in leaves of Quercus petraea and Prunus serotina seedlings growing in different light environments. In the same leaf, SPAD values were measured with the Chl meter, and then photosynthetic pigments content (PP; chlorophyll and carotenoids) was consistently assessed using a conventional extraction method. The measurements were conducted once a month from May to November in three light treatments to obtain the widest possible range of the PP content values. To estimate total Chl content in leaves using the chlorophyll meter the quadratic polynomial functions: y = 0.0374x2 + 0.5345x + 0.5137 and y = 0.024x2 + 2.1998x – 32.7866 were obtained from the relationship between the Chl meter SPAD readings and total Chl determined spectrophotometrically for P. serotina and Q. petraea, respectively. Chl was higher under shade compared with full light regime and Car were linearly correlated with Chl. PP content was positively correlated with air temperature except for Car in P. serotina leaves. It was concluded that at the same soil conditions chlorophyll content in leaves of Q. petraea and P. serotina depended on species, light regimes and temperature of growth. The chlorophyll meter can be used as a practical tool to monitor and compare photosynthetic pigments content in leaves between tree species or populations acclimated to different environments together with a control of abiotic and biotic factors affecting pigments content and leaf optical properties.
    Źródło:
    Dendrobiology; 2015, 73
    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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