Some aspects of the chemistry of aluminium in podzolic soils
作者:
L.J. Evans,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1988)
卷期:
Volume 19,
issue 7-12
页码: 793-803
ISSN:0010-3624
年代: 1988
DOI:10.1080/00103628809367976
出版商: Taylor & Francis Group
关键词: Acidic soils;Al‐speciation;weathering
数据来源: Taylor
摘要:
Studies conducted on the major characteristics of podzolic soils from northeastern Ontario, Canada, have shown that these soils are highly acidic, show intense weathering of minerals and considerable redistribution of both Al and Fe. Approximately 60% and 80% respectively of the accumulated Al and Fe in Bf horizons is in inorganically‐bound forms and secondary minerals formed during podzolization include an expandable 2: 1 clay mineral in the albic horizons and Al‐rich allophanes and ferrihydrite in spodic horizons. Studies on displaced soil solutions indicate significant contents of organically‐bound Al, the amounts of which decrease with depth as the proportion of inorganically‐bound Al increases. The application of phase diagrams and model calculations indicates that amorphous and/or poorly crystalline minerals may control the activity of Al3+in the soil solutions, and that the content of organically‐bound Al in solution could be described adequately by assuming complexation with relatively simple organic acids, such as salicylic acid.
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