Effects of repeated (NH4)2SO4 application on sulfur pools in soil, soil microbial biomass, and ground vegetation of two watersheds in the Black Forest/Germany

摘要: The effect of repeated (NH4)2SO4 applications (3 × 700 kg ha−1 in 1988, 1991, and 1994, respectively) on S pools soil, soil microbial biomass, ground vegetation was studied at two Norway spruce (Picea abies L. [Karst.]) sites the Black Forest/Germany. In both eco-systems, most total pool located soil. also predominant compartment for retention applied SO42--S. fractions organic inorganic forms initial content, experimentally different sites. podzol Schluchsee, accounted 92% S. cambisol Villingen, consisted 33% 67% various compartments ecosystems reflected these proportions. Only minor amounts fertilized (<1%) retained trees, vegetation, biomass. However, between 51% (Villingen) 72% (Schluchsee) Schluchsee podzol, 75% fertilizer accumulated as ester sulfate, whereas SO42-adsorption precipitation Al hydroxy sulfates were restricted by dissolved matter solution. Villingen cambisol, SO42- adsorption dominant process retention, although 20% again sulfate. significant relevance soils emphasizes need models which include formation re-mineralization compounds, especially sulfates, correctly simulating predicting remobilization acid forest subject to changing atmospheric N deposition.