Elemental composition of water extracts from soils during mixed, pine and spruce forests restoration after plowing in Western Russia.
Description
Data on changes of water-soluble soil nutrient ions (Ca2+, Cl–, K+, Mg2+, Na+, NH4+, NO3–, NO2–, SO42–, PO43–, F–) in forest soils litter horizons at different stages of reforestation are presented. The following stages of natural reforestation have been identified within the Smolenskoye Poozerye National Park Biosphere Reserve: agrocenosis, meadow, forests with the age of the tree stand <30, 35-60, 70-80, 80-110, 90-130, 110-135 years.
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Water-soluble soil nutrient ions were analyzed chromatographically in a 1:5 aqueous extract using a Stayer chromatograph (Aquilon, Russia). The quantification of bicarbonate basicity (HCO3–) was conducted through the use of titration with sulfuric acid (H2SO4), with the aid of phenolphthalein and methyl orange as indicators.