Organic matter influences on soil-solution chemistry, ion transport and nutrient availability in forest soils

摘要

In this thesis interactions between organic and inorganic anions and some cations were investigated. The main aims were to: (1) examine the effects of organic matter on nutrient distribution in soil fractions; (2) modify the method of Clarke et al. (1992) for the determination of quickly reacting aluminium (Alqr) for use with soil solutions; (3) examine the effects of Ca solutions of different concentrations and pH, and containing both organic and inorganic anions, in replacing both Al and H, and further to assess the interrelationship between SO4, DOC, total acidity (TA), and pH; (4) examine cation exchange reactions; and (5) use the outcome of these studies for increasing our understanding of the impact of acidification and the use of Ca amendments as a countermeasure. The sequential leaching technique used in this study resembles the field situation, in that the input solution passes through each horizon in turn on its way through the soil. The investigation in this study suggested that the competition between organic and inorganic anions in forest soils is an important process affecting soil acidification and recovery. 67 refs, 21 figs, 5 tabs