Forest decline and pedobiological characteristics of humus forms in the Sumava National Park
Svoboda, M.(Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Lesnicka a Environmentalni) | Podrazsky, V.V.E-mail:[email protected]
Humus forms dynamics and characteristics of different forest sites were studied in the area of Smrcina Mt. in the Sumava National Park territory (Czech Republic). The study was performed in vital Norway spruce forest, dead Norway spruce forest (bark beetle Ips typographus infestation) and on a clear-cut area (site conditions were comparable for all three plots). The amount of surface organic matter was not affected by forest decline or by clear-cut, pH being comparable. N losses were detected from the L + F horizons, falling from 1.93-1.83% (living stand) to 1.73-1.83% (clear-cut area). High ammonia production was documented in substrates from the living stand and high nitrification rates were recorded on the clear-cut area and especially in the dead stand. Respiration activity was more balanced, indicating more intensive dynamics in the case of dead stand and clear-cut area.
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