Untersuchungen zum Stoffhaushalt in einem Fichtenbestand (Picea abies Kars.) der Hochlagen des Bayerischen Waldes : 1. Statusseminar PBWU

1989

S. 51-60

25 Lit. Ang.

Unselbständiges Werk

200059594

Water and matter fluxes in a Norway spruce stand on podsol at high elevation (1203 m) in East Bavaria were investigated in 1987 and 1988. Water turnover is characterized by annual precipitations of 1700 to 1900 mm, causing seepage of around 1300 to 1600 mm. Total concentration of ions in seepage water at 60 cm depth is 400 ömol IE L-Ü with Alß+ as dominating cation (300 to 350 ömol IE L-Ü) and SO4¬- (ungefähr gleich 200 ömol IE L-Ü) and NO3- (130 to 270 ömol IE L-Ü) as dominating anions. In the soil solution the mean molar ratios of Ca/Al resp. Mg/Al are 0.19 resp. 0.10. The strong aluminium mobilization seems to be related to acidic deposition from the atmosphere (2.2 to 2.6 kmol proton input ha-Ü a-Ü) and to soil internal proton production by surplus nitrification (1 to 3 kmol ha-Ü a-Ü). The intensity of the latter process is varying from year to year due to outstanding warm and dry weather periods. Aluminium pushes caused by that may be responsible to some extent for the appearance and intensity of the magnesium deficiency symptoms on the spruces appearing since eight years but significantly varying in its intensity with time. Also nitrate leaching from the soil is influenced. An efflux of around 58 kg N ha-Ü a-Ü were found in 1988 and around 25 kg in 1987. Throughfall input amounts to around 20 to 25 kg N ha-Ü a-Ü. But total input may be higher due to N assimilation in the tree crowns which could not be realized completely.