Abstract
This review presents an analysis of the labile bonding (organic compounds) and
binding (hyphae and roots) mechanisms involved in stabilising soil into
macro-aggregates in soils (aggregates >0 · 25 mm diameter). The main
emphasis is on the approaches used to study these mechanisms and the factors
that affect the aggregating mechanisms at the micro-scale
(<100µm) level in soils. Much of the
understanding of the stabilisation of soil into macro-aggregates in field
soils by labile organic C is derived primarily from the interpretations of
studies where soils were incubated under artificial conditions. In addition,
many recent studies have assessed the importance of labile organic C in
macro-aggregation based only on whole soils analyses of hyphal length,
extractable carbohydrate C, microbial biomass C, or aliphatic C. These
approaches have contributed little to understanding fundamental factors that
can influence the biological mechanisms of macro-aggregation under field
conditions. It is proposed that greater consideration of bonding and binding
aggregation mechanisms and the factors affecting the mechanisms at the
micro-scale level will facilitate development of field management practices
that benefit macro-aggregation. Factors influencing the location and
persistence of bonding and binding mechanisms in the soil matrix are
discussed.
Subject
Earth-Surface Processes,Soil Science,Environmental Science (miscellaneous)
Cited by
246 articles.
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