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CONTINUE TO Pea Gravel Diaphragm
The above information was derived from the Prince George's County Bioretention Manual. Photo credit: T.E. Scott & Associates, Inc. |
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The planting soil is the region that provides the
water and nutrients for the plants to sustain growth. The upper soil zones are
designed to enhance biological activity and encourage root growth. The
macrofauna breaks up organic matter into smaller parts, preparing it for the
next stage of decomposition. In addition, as these animals move through the
soil, they provide aeration and redistribute soil components. This change in
soil texture also allows more infiltration. The microbes (i.e., bacteria and
fungi) break down complex organic compounds and transform nutrients into forms
usable to plants. Symbiotic microbes living within plant roots enhance
nutrient uptake and water retention. Clay particles that comprise a
portion of the soil adsorb heavy metals, nutrients, hydrocarbons, and other
pollutants.