H. Meesenburg et al., LONG-TERM TRENDS IN ATMOSPHERIC DEPOSITION AND SEEPAGE OUTPUT IN NORTHWEST GERMAN FOREST ECOSYSTEMS, Water, air and soil pollution, 85(2), 1995, pp. 611-616
Long term trends of element fluxes in atmospheric deposition and of co
ncentrations in seepage output of seven coniferous and deciduous fores
t stands in northwestern Germany have been evaluated for the period 19
81 - 1994. Decreasing deposition rates of SO4 (50 - 70%) and H+ (60 -
80%) occured al all sites concomitant with the decline of SO2 emission
rates in the former Federal Republic of Germany. Deposition of Ca, Mg
, and K decreased at the Selling and Gottinger Wald stands. During thi
s period no consistent trends in the flux rates of NH4 and NO3 were ap
parent. Sulfate concentrations in soil solution decreased at the Selli
ng and Gottinger Wald stands, whereas an increase occured at Lange Bra
mke south slope. As a consequence of reduced deposition and mobile ani
on concentrations a decrease of Ca, Mg, K, Al, and Mn in soil solution
has been observed at the Selling stands. At the other stands trends o
f cations in soil solution are not consistent. Nitrate concentrations
in soil solution decreased at the Gottinger Wald. A rising tendency wi
th great fluctuations of NO3 concentrations occured at the Selling spr
uce stand.