SciELO - Scientific Electronic Library Online

vol.34 issue1Production of three species of Pleurotus mushrooms and quality evaluation in modified atmosphereOrganic C distribution and N mineralization in soil of oak woodlands with improved pastures author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links

  • Have no similar articlesSimilars in SciELO


Revista de Ciências Agrárias

Print version ISSN 0871-018X


AUXTERO, Edgardo  and  MADEIRA, Manuel. Extractability of aluminium and forms in solution of soils derived from granite in Portugal. Rev. de Ciências Agrárias [online]. 2011, vol.34, n.1, pp.65-79. ISSN 0871-018X.

Extractable aluminium (Al) was determined in surface and subsurface horizons of eleven pedons derived from granite occurring in Portugal, under a wide range of precipitation. Five successive extractions with 1 M KCl, 0.5 M CuCl2 and 0.33 M LaCl3 were used. Monomeric (Alm) and organic (Alorg) forms of Al in the soil solution, extracted at field capacity, were also determined. Amounts of extracted Al were greatest with the 0.5 M CuCl2 and lowest with the 1 M KCl. These amounts showed strong positive correlation with soil organic C contents. Soil horizons having high contents (56-80 g kg-1) of organic C showed the highest amount of extractable Al by the 0.5 M CuCl2 (12.2-30.9 cmolc kg-1). Organically bound Al extracted by the 0.5 M CuCl2 and 0.33 M LaCl3 was also highest in these soils (7.6-10.1 and 4.7-8.3 cmolc kg-1, respectively). In contrast, lowest amounts of Al extracted by the 1 M KCl, 0.5 M CuCl2 and 0.33 M LaCl3 (0.9-4.3, 4.1-17.1 and 2.2-7.2 cmolc kg-1, respectively) were observed in horizons containing low organic C content (3-22 g kg-1). Concentrations of total (AlT), monomeric (Alm) and organic (Alorg) Al in the soil solution of studied soils also increased with increasing soil organic C content, but only Alm was significantly correlated with soil organic Ccontent. Solution of soils having low organic C contents (3-6 g kg-1) showed the lowest concentrations of AlT, Alm and Alorg (0.09-1.60, 0.06-0.38 and 0.03-1.29 µg mL-1, respectively). In contrast, the concentrations of AlT (7.1-17.2 µg mL-1),Alm (0.8-0.9 µg mL-1),and Alorg (7.6-16.9 µg mL-1)were much higher in soils containing high amounts of organic C (37-73 g kg-1). In order to monitor the effects of Al in the soil and quality of sub-superficial water, changes in the concentration of monomeric forms of Al and their activities in the soil solution need further study.

Keywords : Aluminium; organic carbon; pH; soil solution.

        · abstract in Portuguese     · text in English     · English ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License