Poorly-crystalline components in aggregates from soils under different land use and parent material

摘要: Abstract Fe and Al compounds of low degree crystallinity are important components for the development conservation soil structure in many soils. In this work, influence parent material land use on abundance poorly-crystalline forms was studied six macroaggregate fractions from 28 The soils selected developed two geological materials with very different composition: granites or amphibolites, under uses: shrubland agricultural. Poorly crystalline were extracted oxalic acid–ammonium oxalate (inorganic organic forms), pyrophosphate (organic forms). Soils amphibolite richer matter than granite. Agricultural impoverished carbon organic-complexed respect to soils, enriched inorganic poorly Fe. differences related more evident Aggregate stability, assessed by water-dispersible clay quantification, decreased agricultural particular those amphibolite. This reduction aggregate stability is likely due a combination several processes: loss matter, higher pH, an overall compounds, Al-organic complexes.