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r <br />roots is the transport of water and nutrients, and the storage of food reserv es. <br />Soil Compaction : A change in soil physical properties which includes an increase in <br />soil weight per unit volume, and a decrease in soil pore space. Soil compaction is <br />caused by repeated vibrations, frequent traffic and weight. As related to tree roots, <br />compacted soil can cause physical root damage, a decrease in soil oxygen levels with <br />an increase in toxic gases, and can be imperv ious to new^ root development. <br />Tran»;nort Roots: The system or framework of tree roots comprised of major roots <br />and rope roots.