Nutrients in the aboveground biomass of substitute tree species stand with respect to thinning - blue spruce (Picea pungens Engelm.)
2008
Slodicak, M.,Vyzkumny Ustav Lesniho Hospodarstvi a Myslivosti, Opocno (Czech Republic) | Novak, J.,Vyzkumny Ustav Lesniho Hospodarstvi a Myslivosti, Opocno (Czech Republic)
The aim of this study was to analyze the amount of the main nutrients in aerial parts of blue spruce in the substitute forest stand Flaje II (Krusne hory Mts., Czech Republic, 800 m above sea level, spruce forest vegetation zone, acidic category). Results showed that the aboveground biomass of 22-year-old trees without thinning amounted to approximately 56 thousand kg of dry matter per ha. Wood and bark of branches were the most important parts (ca 40%). Needles and stem wood accounted for approximately 26 and 28%, stem bark for 6%. This stand accumulated the nutrients as follows: N - 336 kg, P - 28 kg, K - 138 kg, Ca - 159 kg, Mg - 28 kg per hectare. Thinning with the consequent removal of above-ground biomass (54% of trees, 40% of basal area at the age of 16 years) represented a loss of ca 8.7 thousand kg/ha of total biomass, which contained 53 kg of N, 5 kg of P, 22 kg of K, 26 kg of Ca and 4 kg of Mg. The removal of biomass in areas previously degraded by acid deposition may result in the deficiency of Ca and Mg because of their low content in forest soil. On the other hand, thinning supported the faster growth of trees left after thinning and consequently faster biomass and nutrient accumulation.
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