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Ecophysiological Response of Sun-Exposed Common Beech (Fagus Sylvatica L.) Seedlings under Different Fertilization Levels

Nenad Potočić ; Šumarski institut Jastrebarsko
Ivan Seletković ; Šumarski institut Jastrebarsko
Matjaž Čater ; Gozdarski inštitut Slovenije
Tomislav Čosić ; Agronomski fakultet Sveučilišta u Zagrebu
Mario Šango ; Šumarski fakultet Sveučilišta u Zagrebu
Mislav Vedriš ; Šumarski fakultet Sveučilišta u Zagrebu

Puni tekst: hrvatski pdf 434 Kb

str. 289-300

preuzimanja: 558



The large-scale dieback of Silver fir (Abies alba Mill.), pre sent in Croatia in the past two decades, has led to atypical growth conditions for young Common beech (Fagus sylvatica L.) trees on beech-fir sites. This is in contradiction with recent forestry practice and ecological requirements of beech (skiophytic, drought sensitive).
The aim of this study was to improve the fundamental understanding of the influence of light and nutrient availability in early stages of the development of beech seedlings. To determine the ecophysiological response of beech see dlings to full sunlight conditions, a nursery experiment was established with three fertilization treatments (2, 4 and 6g of Osmocote Exact per 1 liter of sub strate) to simulate various soil fertility conditions (low, optimal and high avai lability of nutrients).
For every treatment, total biomass of seedlings (foliage, stem, roots) and the elemental concentrations of nitrogen, phosphorous, potassium, calcium and magnesium in the plant material determined by chemical analysis. Height and root-collar diameter have been measured and roots morphologi cally analyzed (WinRhizo software package). Light saturation curves (0, 50, 250, 600 in 1200 µmol/m2s) and A-Ci curves (0, 100, 400, 700 in 1000 µmol CO2/l) have been measured (Li-Cor LI-6400) in a controlled environment.
Height, diameter and biomass of seedlings increased with fertilizer dose. Concentrations of N, P and K were growing with fertilizer dose, while Ca and Mg concentrations showed negative effects of overfertilization at the highest fertilizer dose. Root length, surface area and number of root tips were highest in the intermediate treatment while roots were least developed at the highest fertilizer dose.
In all cases assimilation rates of seedlings corresponded well with leaf mass (r2 = 0,59), leaf (r2 = 0,44) and root total nitrogen (r2 = 0,58) and total leaf phosphorus (r2 = 0,45).
Regardless of the conditions of full sunlight and an irregular water supply to seedlings while growing in the nursery, they showed a standard ecophysio logical response to fertilization treatments, indicating that despite the chan ged site conditions in beech and fir stands, the seedlings may keep the capacity to adapt to the environment. The most successful development of see dlings can be expected on nutrient-rich sites.

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