Author:
Ruth A.,Johnson B. B.,Fowler T. J.
Abstract
This study investigates the influence of terrain, including steepness and
position in slope, on soil pH, extractable aluminium (Al), and organic carbon
(OC) in the Axe Creek catchment, Victoria. Both soil pH and Al were determined
by use of 1 : 5 soil : 0·01 M CaCl2 extracts,
with Al measured colorimetrically using a modified pyrocatechol violet method.
Although all soils were acidic, the Al concentration was highest on the
hilltops (>10 mg/kg) and lowest at base-of-slope sites (<1
mg/kg). The concentration of Al was generally inversely related to soil
pH. However, on average, a lower Al concentration was found in the top 10 cm
than in the interval from 10 to 30 cm, even though the soil pH remained
relatively constant throughout the top 30 cm. The lower Al concentration in
the surface layer corresponded to a substantially higher level of OC near the
surface, suggesting the formation of Al-organic matter complexes.
Subject
Earth-Surface Processes,Soil Science,Environmental Science (miscellaneous)
Cited by
4 articles.
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