Gley formation and sulfate reduction as factors defining the composition of lysimetric water from different soil-forming rocks (Model experiment).

摘要

On the basis of the results of model experiments, we can conclude that, under the influence of gley formation and sulfate reduction against the background of a stagnant-percolative water regime, large changes are induced in the physicochemical and chemical properties of lysimetric water. An experiment with acid and neutral rocks (river clay alluvium and loess-like clay) showed that lysimetric water becomes highly acidified (by 2-4 pH units). In lysimetric waters, the content of iron and calcium increases (by one to two orders of magnitude). However, the removal of silicon in the reference sample (aerobic conditions without the introduction of sucrose) from lacustrine calcareous heavy-loam alluvium, which contains sulfates, constituted approximately 50% of the removal of this element in the experimental variant. The influence of sulfate reduction manifests itself in fixation of iron in the form of pyrite.Notes Translated from Vestnik Moskovskogo Universiteta. Pochvovedenie (2013) (1), 3-12 (Ru).