Use of organic amendments for revegetation of disturbed sites with adverse soil conditions.
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2008-12-01
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Abstract:Decomposed granite (DG) substrates are notorious for their ability to erode and
produce sediment. This occurs because the granite particles that crumble out of a
weathering rock have low cohesion and low pore space and low organic matter content.
When wet, they settle into a dense mass with low infiltration. Rainwater runs over the
top and cuts deep gullies. When dry, the materials form crusts or they hard-set. When
they are rewetted and saturated, they can liquefy and slump. As a result of these
characteristics, these substrates are erosive and unstable when wet, and when dry they
are droughty, and restrict root growth. They typically have low nitrogen content for plant
growth. As a result, revegetation success on DG substrates is poor.
Serpentinitic substrates weather from rock with high magnesium and very low
calcium content. On this material, many plant species cannot grow well because of the
low calcium availability. These substrates typically have low clay content, and often
have shallow soil depths, meaning that they are easily saturated and non-cohesive. For
these reasons, serpentinitic substrates are also very erosive.
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