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11. Soil compaction - A change in soil physical <br /> properties which includes an increase in soil weight per unit <br /> volume, and a decrease in soil pore space. Soil compaction <br /> is caused by repeated vibrations, frequent traffic and <br /> weight. As related to tree roots, compacted soil can cause <br /> physical root damage, a decrease in soil oxygen levels with <br /> an increase in toxic gasses, and can be impervious to new <br /> root development. <br /> 12. -Transport roots - The system or-- framework of tree <br /> roots comprised of major woody roots and rope roots. <br /> e <br />