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Stability of aggregates of different size grades in allophanic soils from volcanic ash in New Zealand
Author(s) -
CHURCHMAN G. J.,
TATE K. R.
Publication year - 1987
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1987.tb02119.x
Subject(s) - allophane , volcanic ash , soil water , chemistry , aggregate (composite) , mineralogy , environmental chemistry , clay minerals , volcano , soil science , materials science , geology , geochemistry , composite material
SUMMARY Samples from six ash soils were chosen with a range of Fe and C contents. Stabilities over the aggregate size‐range from < 1 †m to > 2 mm were measured by selectively removing aggregating agents from fresh soil samples. Wet‐sieving was also carried out on both field‐moist and air‐dried 3.4–2.0 mm macroaggregates. Macroaggregate stabilities were closely related to C contents and were also enhanced by high contents of allophane and/or Fe ox . High water contents decreased the stability of field‐moist macroaggregates. Clay‐sized material was most readily dispersed with Na resin after pretreatment with hydrogen peroxide; removing the latter alone was usually ineffective in dispersing clays.