| Abstract: | Balances of annual element fluxes within forest ecosystems in the Solling region Based on measurements of element fluxes the annual changes of element storage within the compartments ?Stand”?, ?Humus layer”? and ?Mineral soil”? are calculated for a beech and a spruce stand. In spite of high rates of N-deposition insufficient N supply especially for the beech stand is obvious. The H+ buffering capacity of the stands is very limited and is greater for the spruce than for the beech stand. The accumulation of C, N, P and Ca within the humus layer of both stands seems to be due to far reaching changes of decomposition conditions caused by acid precipitation. The mineral soil reacts as a sink for H+ and S and as a source for Ca, Mg, Mn and Al. From the cation-anion-balance for the changes of element storage the annual H+-production within the mineral soil was calculated. The sum of H+ ions produced ecosystem internal within the humus layer and the mineral soil ist greater for spruce than for beech. For the spruce stand the total H+-load from deposition and from internal sources is about twice as big as the one of the beech stand. |
