The Missing Flux in a 35S Budget for the Soils of a Small Polluted Catchment

摘要: A combination of cosmogenic and artificial 35S was used to assess the movement sulfur in a steep Central European catchment affected by spruce die-back. The Jezeři catchment, Krusne Hory Mts. (Czech Republic) is characterized large disproportion between atmospheric S input output via stream discharge, with currently exceeding three times. relatively high natural concentration (42 mBq L−1) found deposition into winter spring 2000. In contrast, discharge contained only 2 L−1. Consequently, more than 95% deposited cycled or retained within for several months, while older exported surface water. spring, when soil temperature above 0°C, practically no from instantaneous rainfall exported, despite steepness slopes short mean residence time water (6.5 months). Sulfur cycling includes not just adsorption inorganic sulfate biological uptake, but also volatilization compounds back atmosphere. Laboratory incubations an Orthic Podzol spiked 720 kBq showed 20% loss spike 18 weeks under summer conditions. Under conditions, insignificant (<5%). This missing flux interpreted as volatilized hydrogen sulfide resulting intermittent dissimilatory bacterial reduction. comparable estimated uncertainty many mass balances (±10%), even larger, should be considered constructing these balances. severely polluted forest catchments, such Jezeři, may exceed 13 kg ha−1 a−1, which current total parts North America Europe.