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The effects of acid deposition on cation release and key properties of two forest soils collected near Guiyang and Nanchang in southern China were studied in leaching experiments. Rebuilt soil columns consisting of three soil layers were exposed to five different leaching solutions, i.e. deionized water, two solutions with pH about 3.5 and two solutions with pH about 4.3. Salts (CaSO 4 ,...
The effects of temperature, time and cycles of drying and rewetting on the extractability of Zn added to a calcareous soil were studied by three successive extractions with DTPA. The concentrations of DTPA-extractable Zn increased linearly with the concentration of added Zn. The proportion of added Zn in the DTPA-extractable fraction decreased with increasing incubation time and with increasing...
Magic angle spinning (MAS) nuclear magnetic resonance (NMR) was used to investigate the chemical environment of P in soil and soil components. 31 P and 27 Al MAS NMR spectra are presented of synthetic aluminium hydroxides (amorphous aluminium hydroxide and gibbsite), reacted with P under different conditions of P concentration, temperature and pH. The reaction product is...
A short general review of all aspects of the NMR technique, in both the spectroscopic and imaging modes, as applied to the study of soil, is presented from a mainly technical point of view. Illustrations, in the form of spectra and images, are reproduced for whole soils, solids, solid fractions, and liquid extracts from material in the authors' group. Nuclides covered are 1 H, 13...
Displacement imaging is a recent, powerful NMR method with which distributions of displacements can be acquired of e.g. fluids within a porous medium. Both motion parallel and perpendicular to the flow direction may be observed within a time window of a few milliseconds to several seconds. By combining displacement imaging with the line scan technique, one-dimensionally resolved measurements with...
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