Organic Sulfur in Throughfall, Stem Flow, and Soil Solutions from Temperate Forests

1990

S. 1535-1539

1 Abb., 21 Lit. Ang.

Unselbständiges Werk

200088992

Canadian Journal of Forest Research 1990 ; 20(9), S. 1535-1539

In the assessment of S cycling in forest ecosystems, solutions passing through the forests are normally analyzed for inorganic SO4; other forms of S are rarely considered. In this study, organic S (estimated as the difference between total S and SO4-S) was measured in canopy and soil solutions from eight forest stands spanning a broad range of overstory and soil types. Organic-S concentrations varied among the different types of solutions and among the forests, with values ranging from 0 to 50 (Formel). Organic S was (Formel) of total S in precipitation, 5 to 54% in throughfall, 1 to 50% in stem flow, 16 to 46% in O-horizon solution, 11 to 21% in A- or E- horizon solutions, and 0 to 29% in B-horizon solutions. Organic S was positively correlated with organic C and organic N in Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and red alder (Alnus rubra Bong.) soil solutions and in Douglas-fir stem flow (Formel). Inclusion of solution organic S in nutrient cycling budgets can alter estimates of S transfers within forests and S transport out of some forest ecosystems.