Radovi, Vol. 42 No. 2, 2007.
Izvorni znanstveni članak
Dynamics of nitrogen and phosphorus in needles of silver fir (Abies alba mill.) trees of different defoliation classes
Nenad Potočić
; Šumarski institut, Jastrebarsko
Tomislav Čosić
; Agronomski fakultet Sveučilišta u Zagrebu
Ivan Pilaš
; Šumarski institut, Jastrebarsko
Ivan Seletković
; Šumarski institut, Jastrebarsko
Bori Vrbek
; Šumarski institut, Jastrebarsko
Sažetak
The dynamics of nitrogen and phosphorus in current and one-year old needles of Silver
fir (Abies alba Mill.) has been monitored during two vegetational seasons. The research was
conducted on five plots marked by different edaphic and climatic conditions, and sampled
trees had different defoliation degrees. The aim was to determine the nutritional status of
Silver fir, the relations of crown condition and nutrition, and the influence of soil and climate
properties on the concentration of nitrogen and phosphorus in needles. Overall, the
level of these elements in fir needles is low. The concentration of nitrogen and phosphorus
in Silver fir needles depends on the sampling period, sampling year and research plot. Physiologically
weakened trees are less able to control their nutritional status. The disturbances
in nutrition result in the progressive lowering of needle mass in regards to increased crown
defoliation. Climate properties have a pronounced effect on the nutrition of Silver fir trees.
Their negative influence is expressed through nutritional deficiencies as a result of periods of
drought.
Ključne riječi
nitrogen; phosphorus; defoliation; nutritional status; drought; soil properties
Hrčak ID:
25990
URI
Datum izdavanja:
28.12.2007.
Posjeta: 1.202 *