Aboveground biomass of substitute blue spruce stands in the Ore Mountains

Bonn

2007

S. 96-100

2 Abb., 2 Tab., 11 Lit. Ang.

Unselbständiges Werk

200141249

Presented paper is focused on quantification of aboveground biomass in substitute blue spruce (Picea pungens Engelm.) stands in the Ore Mts. (Northern Czechia) by the method of sample trees felled and measured at the age of 21 years. Besides the classical measuring of stem volume (length, diameter by sections), we collected data about diameter of branch base (for all branches). For laboratory analyses (dry biomass and nutrient content of needles, bark and wood) sample branches and wood samples were used. Results showed that total aboveground biomass on control variant increased from ca 7 thousand kg.ha-1 (at the age of 12 years) to 55 thousand kg.ha-1 (at the age of 21 years). Consequently in the Ore Mts., one hectare of twenty-year-old blue spruce stands represents (in dry biomass): about 15,000 kg of stem wood, 3,000 kg of stem bark, 22,000 kg of branches and 14,000 kg of needles. In particular fragments of accumulated aboveground biomass there are 326 kg of N, 28 kg of P, 132 kg of K and 27 kg of Mg per hectare.